Cisco IOS XR Commands by Software Package, Release 3.8.0

T3, E3, T1, E1 Controller Commands on Cisco IOS XR Software

This module describes the commands to configure T3/E3 and T1/E1 controllers on routers supporting Cisco IOS XR software.

bert e1

To start or stop a configured bit error rate test (BERT) on an E1 controller or channel group, use the bert e1 command in EXEC mode. To return to the default state, use the no form of this command.

bert e1 interface-path-id [channel-group channel-group-number] [error] {start | stop}

Syntax Description

Defaults

No default behavior or values

Command Modes

EXEC

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

For the interface-path-id argument, use the following guidelines:

•If specifying a physical interface, the naming notation is rack/slot/module/port. The slash between values is required as part of the notation. An explanation of each component of the naming notation is as follows:

–rack: Chassis number of the rack.

–slot: Physical slot number of the line card.

–module: Module number. A physical layer interface module (PLIM) is always 0.

–port: Physical port number of the interface.

•If specifying a virtual interface, the number range varies, depending on interface type.

Note Before you can start a BERT on an E1 controller or channel group, you must configure a BERT pattern using the bert pattern command. If desired, you can also adjust the default setting (1 minute) of the BERT interval using the bert interval command. Both of these commands are available in E1 configuration mode and channel group configuration mode.

To view the BERT results, use the show controllers e1 command in EXEC mode. The BERT results include the following information:

•Type of test pattern selected

•Status of the test

•Interval selected

•Time remaining on the BERT

•Total bit errors

•Total bits received

BERT is data intrusive. Regular data cannot flow on a line while the test is in progress. The line is put in an alarm state when a BERT is in progress and restored to a normal state after a BERT has been terminated.

Examples

The following example shows how to start and stop a BERT on an E1 controller:

RP/0/0/CPU0:Router# bert e1 0/3/0/0 start

RP/0/0/CPU0:Router# bert e1 0/3/0/0 stop

The following example shows how to inject errors into the BERT stream on an E1 controller:

RP/0/0/CPU0:Router# bert e1 0/3/0/0 error

Related Commands

bert e3

To start or stop a configured bit error rate test (BERT) on an E3 controller or channel group, use the bert e3 command in EXEC mode. To return to the default state, use the no form of this command.

bert e3 interface-path-id [error] {start | stop}

Syntax Description

Defaults

No default behavior or values

Command Modes

EXEC

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

For the interface-path-id argument, use the following guidelines:

•If specifying a physical interface, the naming notation is rack/slot/module/port. The slash between values is required as part of the notation. An explanation of each component of the naming notation is as follows:

–rack: Chassis number of the rack.

–slot: Physical slot number of the line card.

–module: Module number. A physical layer interface module (PLIM) is always 0.

–port: Physical port number of the interface.

•If specifying a virtual interface, the number range varies, depending on interface type.

Note Before you can start a BERT on an E3 controller, you must configure a BERT pattern using the bert pattern command. If desired, you can also adjust the default setting (1 minute) of the BERT interval using the bert interval command. Both of these commands are available in E3 configuration mode.

To view the BERT results, use the show controllers e3 command in EXEC mode. The BERT results include the following information:

•Type of test pattern selected

•Status of the test

•Interval selected

•Time remaining on the BERT

•Total bit errors

•Total bits received

BERT is data intrusive. Regular data cannot flow on a line while the test is in progress. The line is put in an alarm state when a BERT is in progress and restored to a normal state after a BERT has been terminated.

Examples

The following example shows how to start and stop a BERT on an E3 controller:

RP/0/0/CPU0:Router# bert e3 0/3/0/0/0 start

RP/0/0/CPU0:Router# bert e3 0/3/0/0/0 stop

The following example shows how to inject errors into the BERT stream on an E3 controller:

RP/0/0/CPU0:Router# bert e3 0/3/0/0 error

Related Commands

bert error

To insert errors into a BERT stream on a T3/E3 or T1/E1 line, use the bert error command in T3 or T1 configuration mode. To disable a BERT pattern, use the no form of this command.

bert error [number]

no bert error [number]

Syntax Description

Defaults

The default is 1.

Command Modes

T3 configuration
E3 configuration
T1 configuration
E1 configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

Use the bert error command with the bert pattern command.

Examples

The following example shows how to insert 10 errors into the BERT bit stream on the T1 controller in slot 0, subslot 3:

RP/0/0/CPU0:Router(config)# controller t1 0/0/3/1/10

RP/0/0/CPU0:Router(config-t1e1)# bert error 10

Related Commands

bert interval

To specify the duration of a bit error rate test (BERT) pattern on a T3/E3 or T1/E1 line, use the bert interval command in T3, E3, T1, E1, or channel group configuration mode. To revert to the default interval, use the no form of this command.

bert interval time

no bert interval time

Syntax Description

Defaults

A BERT runs for 1 minute.

Command Modes

T3 configuration
E3 configuration
T1 configuration
E1 configuration
Channel group configuration for T1 and E1

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

Use the bert interval command with the bert pattern command. If the bert interval command is not used, then the BERT runs for a default of 1 minute.

Examples

The following example shows how to limit the BERT to 10 minutes on the T1 controller in slot 0, subslot 3:

RP/0/0/CPU0:Router(config)# controller t1 0/0/3/1/10

RP/0/0/CPU0:Router(config-t1e1)# bert interval 10

Related Commands

bert pattern

To enable a bit error rate test (BERT) pattern on a T3/E3 or T1/E1 line or an individual channel group, use the bert pattern command in T3, E3, T1, E1, or channel group configuration mode. To disable a BERT pattern, use the no form of this command.

bert pattern {0s | 1in8 | 1s | 2^11 | 2^15 | 2^20 | 2^20-QRSS | 2^23 | 2^9 | 3in24 | 55Daly | 55Octet | alt-0-1 | ds0-1 | ds0-2 | ds0-3 | ds0-4}

no bert pattern {0s | 1in8 | 1s | 2^11 | 2^15 | 2^20 | 2^20-QRSS | 2^23 | 2^9 | 3in24 | 55Daly | 55Octet | alt-0-1 | ds0-1 | ds0-2 | ds0-3 | ds0-4}

Syntax Description

Defaults

BERT pattern test is disabled

Command Modes

T3 configuration
E3 configuration
T1 configuration
E1 configuration
Channel group configuration for T1 and E1

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

BERT is supported on each of the T3/E3 or T1/E1 links. It is done only over an unframed T3/E3 or T1/E1 signal and is run on only one port at a time. It is also supported on an individual channel group.

To begin a BERT, commit the configuration and use the bert t1, bert e1, bert t3, or bert e3 command in EXEC mode.

To view the BERT results, use the show controllers t1 or show controllers t3 command in EXEC mode. The BERT results include the following information:

•Type of test pattern selected

•Status of the test

•Interval selected

•Time remaining on the BERT

•Total bit errors

•Total bits received

BERT is data intrusive. Regular data cannot flow on a line while the test is in progress. The line is put in an alarm state when a BERT is in progress and restored to a normal state after a BERT has been terminated.

Examples

The following example shows how to enable the running of a BERT pattern of all zeros on the T1 controller in slot 0, subslot 3:

RP/0/0/CPU0:Router(config)# controller t1 0/0/3/1/10

RP/0/0/CPU0:Router(config-t1e1)# bert pattern 0s 

Related Commands

bert t1

To start or stop a configured bit error rate test (BERT) on a T1 controller or channel group, use the
bert t1 command in EXEC mode.

bert t1 interface-path-id [channel-group channel-group-number] [error] {start | stop}

Syntax Description

Defaults

No default behavior or values

Command Modes

EXEC

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

For the interface-path-id argument, use the following guidelines:

•If specifying a physical interface, the naming notation is rack/slot/module/port. The slash between values is required as part of the notation. An explanation of each component of the naming notation is as follows:

–rack: Chassis number of the rack.

–slot: Physical slot number of the line card.

–module: Module number. A physical layer interface module (PLIM) is always 0.

–port: Physical port number of the interface.

•If specifying a virtual interface, the number range varies, depending on interface type.

Note Before you can start a BERT on a T1 controller or channel group, you must configure a BERT pattern using the bert pattern command. If desired, you can also adjust the default setting (1 minute) of the BERT interval using the bert interval command. Both of these commands are available in T1 configuration mode and channel group configuration mode.

To view the BERT results, use the show controllers t1 command in EXEC mode. The BERT results include the following information:

•Type of test pattern selected

•Status of the test

•Interval selected

•Time remaining on the BERT

•Total bit errors

•Total bits received

BERT is data intrusive. Regular data cannot flow on a line while the test is in progress. The line is put in an alarm state when a BERT is in progress and restored to a normal state after a BERT has been terminated.

Examples

The following example shows how to start and stop a BERT on a T1 controller:

RP/0/0/CPU0:Router# bert t1 0/3/0/0/0 start

RP/0/0/CPU0:Router# bert t1 0/3/0/0/0 stop

The following example shows how to inject errors into the BERT stream on an T1 controller:

RP/0/0/CPU0:Router# bert t1 0/3/0/0 error

Related Commands

bert t3

To start or stop a configured bit error rate test (BERT) on a T3 controller or channel group, use the
bert t3 command in EXEC mode.

bert t3 interface-path-id [error] {start | stop}

Syntax Description

Defaults

No default behavior or values

Command Modes

EXEC

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

For the interface-path-id argument, use the following guidelines:

•If specifying a physical interface, the naming notation is rack/slot/module/port. The slash between values is required as part of the notation. An explanation of each component of the naming notation is as follows:

–rack: Chassis number of the rack.

–slot: Physical slot number of the line card.

–module: Module number. A physical layer interface module (PLIM) is always 0.

–port: Physical port number of the interface.

•If specifying a virtual interface, the number range varies, depending on interface type.

Note Before you can start a BERT on a T3 controller, you must configure a BERT pattern using the bert pattern command. If desired, you can also adjust the default setting (1 minute) of the BERT interval using the bert interval command. Both of these commands are available in T3 configuration mode.

To view the BERT results, use the show controllers t3 command in EXEC mode. The BERT results include the following information:

•Type of test pattern selected

•Status of the test

•Interval selected

•Time remaining on the BERT

•Total bit errors

•Total bits received

BERT is data intrusive. Regular data cannot flow on a line while the test is in progress. The line is put in an alarm state when a BERT is in progress and restored to a normal state after a BERT has been terminated.

Examples

The following example shows how to start and stop a BERT on a T3 controller:

RP/0/0/CPU0:Router# bert t3 0/3/0/0 start

RP/0/0/CPU0:Router# bert t3 0/3/0/0 stop

The following example shows how to inject errors into the BERT stream on a T3 controller:

RP/0/0/CPU0:Router# bert t3 0/3/0/0 error

Related Commands

cablelength

To specify the distance of the cable from the routers to the network equipment, use the cablelength command in T3 or E3 configuration mode. To restore the default cable length, use the no form of this command.

cablelength feet

no cablelength

Syntax Description

Defaults

The default is 224 feet.

Command Modes

T3 configuration
E3 configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

You can specify a cable length from 0 to 450 feet; however, the hardware recognizes only two ranges: 0 to 49 and 50 to 450. For example, entering 35 feet uses the 0 to 49 range. If you later change the cable length to 40 feet, there is no change because 40 is still within the 0 to 49 range. However, if you change the cable length to 50, the 50 to 450 range is used. The actual number you enter is stored in the configuration file.

Examples

The following example shows how to set the cable length for the router to 300 feet:

RP/0/0/CPU0:Router(config)# controller t3 0/6/0/0

RP/0/0/CPU0:Router(config-t3)# cablelength 300

Related Commands

cablelength long

To increase the pulse of a signal at the receiver and to decrease the pulse from the transmitter using pulse equalization and line build-out for a T1 cable, use the cablelength long command in T1 configuration mode. To return the pulse equalization and line build-out values to their default settings, use the no form of this command.

cablelength long db-gain-value db-loss-value

no cablelength long db-gain-value db-loss-value

Syntax Description

Defaults

db-gain-value: gain26
db-loss-value: 0db

Command Modes

T1 configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

Use the cablelength long command to configure DS1 links (meaning, to build CSU/DSU links) when the cable length is longer than 655 feet.

A pulse equalizer regenerates a signal that has been attenuated and filtered by a cable loss. Pulse equalization does not produce a simple gain, but it filters the signal to compensate for complex cable loss. A gain26 receiver gain compensates for a long cable length equivalent to 26 dB of loss, whereas a gain36 compensates for 36 dB of loss.

The lengthening or building out of a line is used to control far-end crosstalk. Line build-out attenuates the stronger signal from the customer installation transmitter so that the transmitting and receiving signals have similar amplitudes. A signal difference of less than 7.5 dB is ideal. Line build-out does not produce simple flat loss (also known as resistive flat loss). Instead, it simulates a cable loss of 7.5 dB, 15 dB, or 22.5 dB so that the resulting signal is handled properly by the receiving equalizer at the other end.

Examples

The following example shows how to increase the receiver gain by 36 decibels and decrease the transmitting pulse by 15 decibels:

RP/0/5/CPU0:Router(config)#controller t1 0/4/2/0/1

RP/0/5/CPU0:Router(config-t1)#cablelength long gain36 -15db

Related Commands

cablelength short

To set a cable length of 655 feet or shorter for a DS1 link, use the cablelength short command in T1 configuration mode. To delete the cablelength short value, use the no form of this command.

cablelength short length

no cablelength short length

Syntax Description

Defaults

The default cable length is 533 feet.

Command Modes

T1 configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

Use the cablelength short command to configure DSX-1 links when the cable length is 655 feet or less. This command is supported on T1 controllers only.

Examples

The following example shows how to set the cable length for the DS1 link to 655 feet:

RP/0/0/CPU0:Router(config)# controller t1 0/4/2/0/1

RP/0/0/CPU0:Router(config-t3)# cablelength short 655ft

Related Commands

channel-group

To configure a DS0 channel group and enter channel group configuration mode, use the channel-group command in T1 or E1 configuration mode. To unassign a channel group, use the no form of this command.

channel-group channel-group-number

no channel-group channel-group-number

Syntax Description

Defaults

No default behavior or values

Command Modes

T1 configuration
E1 configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

The channel-group command is available only on channelized SPAs.

Use the channel-group command in configurations in which the router must communicate with a T1 or an E1 fractional data line. The channel group number may be arbitrarily assigned and must be unique for the controller. An associated serial interface is created with each defined channel group.

Before the channel group configuration is valid, you must define the associated DS0 time slots using the timeslots command.

Use the no channel group command to delete a channel group.

Examples

The following example shows how to enter channel group configuration mode for channel group number 5 and change the speed of the underlying DS0s in the channel group to 56 kbps:

RP/0/0/CPU0:Router(config)# controller t1 0/6/0/0/10

RP/0/0/CPU0:Router(config-t1)# channel-group 5

RP/0/0/CPU0:Router(config-t1-channel_group)# speed 56

The following example shows how to associate DS0 time slots 1, 6, 8, 9, and 10 to channel group 5:

RP/0/0/CPU0:Router(config)# controller t1 0/6/0/0/10

RP/0/0/CPU0:Router(config-t1)# channel-group 5 

RP/0/0/CPU0:Router(config-t1-channel_group)# timeslots 1:6:8-10

Related Commands

clock source (T1/E1)

To set clocking for individual T1 or E1 links, use the clock source command in T1 or E1 configuration mode. To return to the default, use the no form of this command.

clock source {internal | line}

no clock source

Syntax Description

Defaults

The default clock source is internal.

Command Modes

T1 configuration
E1 configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

Examples

The following example shows how to set the clocking on the T1 controller in slot 6, subslot 0 to internal:

RP/0/0/CPU0:Router(config)# controller t1 0/6/0/0

RP/0/0/CPU0:Router(config-t1e1)# clock source internal

Related Commands

clock source (T3/E3)

To set clocking for individual T3 or E3 links, use the clock source command in T3 or E3 configuration mode. To return to the default, use the no form of this command.

clock source {internal | line}

no clock source

Syntax Description

Defaults

The default clock source is internal.

Command Modes

T3 configuration
E3 configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

If you do not specify the clock source command, the default clock source is used.

Configure the clock source line command if your telephone company or the remote data service unit provides the master clock of the T3 or E3 connection.

Configure the clock source internal command if your router provides the master clock of the T3 or E3 connection.

Note For a back-to-back connection between two T3 or E3 network modules, one controller must be configured for internal clocking while the other controller must be configured for line clocking.

Examples

The following example shows how to set the clocking on the T3 controller in slot 6, subslot 0 to line:

RP/0/0/CPU0:Router(config)# controller t3 0/6/0/0

RP/0/0/CPU0:Router(config-t3)# clock source line

Related Commands

controller e1

To configure an E1 controller and enter E1 configuration mode, use the controller e1 command in global configuration mode. To return to the default state, use the no form of this command.

controller e1 interface-path-id

no controller e1 interface-path-id

Syntax Description

Defaults

No default behavior or values

Command Modes

Global configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

For the interface-path-id argument, use the following guidelines:

•If specifying a physical interface, the naming notation is rack/slot/module/port. The slash between values is required as part of the notation. An explanation of each component of the naming notation is as follows:

–rack: Chassis number of the rack.

–slot: Physical slot number of the line card.

–module: Module number. A physical layer interface module (PLIM) is always 0.

–port: Physical port number of the interface.

•If specifying a virtual interface, the number range varies, depending on interface type.

The controller e1 command is used in configurations in which the router is intended to communicate with an E1 fractional data line. The controller e1 command is available only on channelized interfaces.

Use the mode command in T3 configuration mode to specify the mode for the port. The default mode for 2-Port and 4-Port Channelized T3 SPAs is T1.

Note If you do not use the mode command to define the port to be E1, you cannot configure the E1 controller.

To view the status of the controllers, use the show controllers e1 command.

Examples

The following example shows how to enter E1 configuration mode for a controller:

RP/0/0/CPU0:Router(config)# controller e1 0/1/0/0 

RP/0/0/CPU0:Router(config-e1)#

Related Commands

controller e3

To configure an E3 controller and enter E3 configuration mode, use the controller e3 command in global configuration mode. To return to the default state, use the no form of this command.

controller e3 interface-path-id

no controller e3 interface-path-id

Syntax Description

Defaults

No default behavior or values

Command Modes

Global configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

For the interface-path-id argument, use the following guidelines:

•If specifying a physical interface, the naming notation is rack/slot/module/port. The slash between values is required as part of the notation. An explanation of each component of the naming notation is as follows:

–rack: Chassis number of the rack.

–slot: Physical slot number of the line card.

–module: Module number. A physical layer interface module (PLIM) is always 0.

–port: Physical port number of the interface.

•If specifying a virtual interface, the number range varies, depending on interface type.

The controller e3 command applies only to the 2-Port and 4-Port Clear Channel T3/E3 SPAs. Use the card type command to define the controller type to be E3.

To view the status of the controllers, use the show controllers e3 command.

Examples

The following example shows how to enter E3 configuration mode for a controller in slot 6, on the SPA in subslot 2, on E3 controller 0:

RP/0/0/CPU0:Router(config)# controller e3 0/6/2/0

RP/0/0/CPU0:Router(config-e3)#

Related Commands

controller t1

To configure a T1 controller and enter T1 configuration mode, use the controller t1 command in global configuration mode. To return to the default state, use the no form of this command.

controller t1 interface-path-id

no controller t1 interface-path-id

Syntax Description

Defaults

No default behavior or values

Command Modes

Global configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

For the interface-path-id argument, use the following guidelines:

•If specifying a physical interface, the naming notation is rack/slot/module/port. The slash between values is required as part of the notation. An explanation of each component of the naming notation is as follows:

–rack: Chassis number of the rack.

–slot: Physical slot number of the line card.

–module: Module number. A physical layer interface module (PLIM) is always 0.

–port: Physical port number of the interface.

•If specifying a virtual interface, the number range varies, depending on interface type.

The controller t1 command is used in configurations in which the router is intended to communicate with a T1 fractional data line. The controller t1 command is available only on channelized SPAs.

Use the mode command in T3 configuration mode to specify the mode for each T3 port. The default mode for 2-Port and 4-Port Channelized T3 SPAs is T1.

To view the status of the controllers, use the show controllers t1 command.

Examples

The following example shows how to enter T1 configuration mode for a controller:

RP/0/0/CPU0:Router(config)# controller t1 0/1/0/0 

RP/0/0/CPU0:Router(config-t1)#

Related Commands

controller t3

To configure a T3 controller and enter T3 configuration mode, use the controller t3 command in global configuration mode. To return to the default state, use the no form of this command.

controller t3 interface-path-id

no controller t3 interface-path-id

Syntax Description

Defaults

No default behavior or values

Command Modes

Global configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

For the interface-path-id argument, use the following guidelines:

•If specifying a physical interface, the naming notation is rack/slot/module/port. The slash between values is required as part of the notation. An explanation of each component of the naming notation is as follows:

–rack: Chassis number of the rack.

–slot: Physical slot number of the line card.

–module: Module number. A physical layer interface module (PLIM) is always 0.

–port: Physical port number of the interface.

•If specifying a virtual interface, the number range varies, depending on interface type.

For the 2-Port and 4-Port Clear Channel T3/E3 SPAs, use the card type command to define the controller type to be T3.

To view the status of the controllers, use the show controllers t3 command.

Examples

The following example shows how to enter T3 configuration mode for a controller in slot 6, on the SPA in subslot 2, on T3 controller 0:

RP/0/0/CPU0:Router(config)# controller t3 0/6/2/0

RP/0/0/CPU0:Router(config-t3)#

Related Commands

delay clear (T1/E1)

To configure the amount of time before a T1 or E1 path delay trigger alarm is cleared, use the delay clear command in T1 or E1 configuration mode. To return the command to its default setting, use the no form of this command.

delay clear value

no delay clear value

Syntax Description

Defaults

The default is 10 seconds.

Command Modes

T1 configuration
E1 configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

Examples

The following example shows how to specify that T1 path delay trigger alarms should be cleared after 9000 seconds:

RP/0/0/CPU0:router(config)# controller t1 0/4/2/0/1

RP/0/0/CPU0:router(config-t3)#delay clear 9000

Related Commands

delay clear (T3/E3)

To configure the amount of time before a T3 or E3 path delay trigger alarm is cleared, use the delay clear command in T3 or E3 configuration mode. To return the command to its default setting, use the no form of this command.

delay clear value

no delay clear value

Syntax Description

Defaults

The default is 10 seconds.

Command Modes

T3 configuration
E3 configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

Examples

The following example shows how to specify that T3 path delay trigger alarms should be cleared after 9000 seconds:

RP/0/0/CPU0:router(config)# controller t3 0/4/2/0

RP/0/0/CPU0:router(config-t3)# delay clear 9000

Related Commands

delay trigger (T1/E1)

To configure a time value for the T1 or E1 path delay trigger, use the delay trigger command in T1 or E1 configuration mode. To return the command to its default setting, use the no form of this command.

delay trigger value

no delay trigger

Syntax Description

Defaults

The default is 2.5 seconds.

Command Modes

T1 configuration
E1 configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

If the timer for the T1 or E1 path delay trigger expires, an alarm is declared.

Examples

The following example shows how to set the T1 path delay trigger to 8000 milliseconds:

RP/0/0/CPU0:router(config)# controller t1 0/4/2/0/1

RP/0/0/CPU0:router(config-t1)# delay trigger 8000

Related Commands

delay trigger (T3/E3)

To configure a time value for the T3 or E3 path delay trigger, use the delay trigger command in T3 or E3 configuration mode. To return the command to its default setting, use the no form of this command.

delay trigger value

no delay trigger

Syntax Description

Defaults

The default is 2.5 seconds.

Command Modes

T3 configuration
E3 configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

If the timer for the T3 or E3 path delay trigger expires, an alarm is declared.

Examples

The following example shows how to set the T3 path delay trigger to 8000 milliseconds:

RP/0/0/CPU0:router(config)# controller t3 0/4/2/0

RP/0/5/CPU0:PE21_C12406(config-t3)# delay trigger 8000

Related Commands

description (T1/E1)

To configure a description for a T1 or E1 controller, use the description command in T1 or E1 configuration mode. To delete a T1 or E1 controller description, use the no form of this command.

description text

no description [text]

Syntax Description

Defaults

No description is configured.

Command Modes

T1 configuration
E1 configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

Examples

The following example shows how to configure a description for a T1 controller:

RP/0/0/CPU0:Router(config)# controller t1 0/6/2/0

RP/0/0/CPU0:Router(config-t1)# description This is a sample description for T1 controller 
0/6/2/0

Related Commands

description (T3/E3)

To configure a description for a T3 or E3 controller, use the description command in T3 or E3 configuration mode. To delete a T3 or E3 controller description, use the no form of this command.

description text

no description [text]

Syntax Description

Defaults

No description is configured.

Command Modes

T3 configuration
E3 configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

Examples

The following example shows how to configure a description for a T3 controller:

RP/0/0/CPU0:Router(config)# controller t3 0/6/2/0

RP/0/0/CPU0:Router(config-t3)# description This is a sample description for T3 controller 
0/6/2/0

Related Commands

down-when-looped (T1/E1)

To configure a T1 or E1 controller to inform the system that it is down when loopback is detected, use the down-when-looped command in T1 or E1 configuration mode.

down-when-looped

Syntax Description

This command has no arguments or keywords.

Defaults

By default, a T1 or E1 controller does not inform the system that it is down when loopback is detected.

Command Modes

T1 configuration
E1 configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

This command does not have a no form.

Examples

The following example shows how to configure a T1 controller to inform the system that the associated line is down if a loopback is detected:

RP/0/0/CPU0:router(config)# controller t1 0/4/2/0/1                 

RP/0/0/CPU0:router(config-t1)# down-when-looped

down-when-looped is a traffic-affecting operation if any loopback is present

RP/0/0/CPU0:router(config-t1)# 

Related Commands

down-when-looped (T3/E3)

To configure a T3 or E3 controller to inform the system that it is down when loopback is detected, use the down-when-looped command in T3 or E3 configuration mode.

down-when-looped

Syntax Description

This command has no arguments or keywords.

Defaults

By default, a T3 or E3 controller does not inform the system that it is down when loopback is detected.

Command Modes

T3 configuration
E3 configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

This command does not have a no form.

Examples

The following example shows how to configure a T3 controller to inform the system that the associated line is down if a loopback is detected:

RP/0/0/CPU0:router(config)# controller t3 0/4/2/0 

RP/0/0/CPU0:router(config-t3)# down-when-looped

down-when-looped is a traffic-affecting operation if any loopback is present

RP/0/0/CPU0:router(config-t3)# 

Related Commands

dsu bandwidth

To specify the maximum allowable bandwidth used by a T3 or an E3 controller, use the dsu bandwidth command in T3 or E3 configuration mode. To return to the default state, use the no form of this command.

dsu bandwidth kbps

no dsu bandwidth

Syntax Description

Defaults

The default bandwidth is 44210.

Command Modes

T3 configuration
E3 configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

The local interface configuration must match the remote interface configuration. For example, if you reduce the maximum bandwidth to 16,000 on the local port, you must also do the same on the remote port.

The dsu bandwidth command reduces the bandwidth by padding the E3 and T3 frame.

To verify the data service unit (DSU) bandwidth configured on the interface, use the show controllers t3 or show controllers e3 command in EXEC mode.

When G.751 framing is used on E3 links, DSU bandwidth can be used to select a payload subrate from 34,010 kbps down to 22 kbps. Before framing bypass can be used, a DSU bandwidth of 34,010 kbps must be configured.

Although software allows the user to configure a continuous range of bandwidths in subrate modes, vendors support bandwidths only in quantums (for example, in an E3 digital link, bandwidth must be in multiples of 358 kbps). Therefore, the software sets the user-configured bandwidth to the closest vendor-supported bandwidth. Use the show controllers t3 or show controllers e3 command to display the actual bandwidth that is configured.

The following table shows DSU modes and vendor-supported bandwidths.

Examples

The following example shows how to set the maximum allowable DSU bandwidth to 16,000 kbps on a controller in slot 6, on the SPA in subslot 2, on T3 controller 0:

RP/0/0/CPU0:Router(config)# controller t3 0/6/2/0

RP/0/0/CPU0:Router(config-t3)# dsu bandwidth 16000

The following example shows the user-configured subrate bandwidth and the actual configured subrate bandwidth as displayed in the output of the show controllers t3 command:

RP/0/0/CPU0:Router# show controllers t3 0/3/2/0

  Transmitter is sending RAI.

  Receiver has loss of signal.

  FEAC code received: DS3 Out-Of-Frame

  Framing is C-BIT Parity, Line Code is B3ZS, Clock Source is Internal

  Subrate is enabled. Mode: Cisco(default), Bandwidth: 44210 kbps

  Remote accept is enabled

  Remote fullrate has no request outstanding

  INTERVAL      LCV   PCV   CCV   PES  PSES  SEFS   UAS   LES   CES  CSES

  23:36-23:42    0     0     0     0     0     0     380   0     0     0

.

.

.

Related Commands

dsu mode

To specify the interoperability mode used by a T3 or an E3 controller, use the dsu mode command in T3 or E3 configuration mode. To return to the default state, use the no form of this command.

dsu mode mode

no dsu mode

Syntax Description

Defaults

The default is cisco.

Command Modes

T3 configuration
E3 configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

Refer to Table 99 for more information regarding the modes.

The local interface configuration must match the remote interface configuration. For example, if you define the data service unit (DSU) interoperability mode as digital-link on the local port, you must also do the same on the remote port.

You must know what type of DSU is connected to the remote port to determine if it interoperates with a T3 or an E3 controller. The dsu mode command enables and improves interoperability with other DSUs.

To verify the DSU mode configured on the interface, use the show controllers t3 command in EXEC mode.

Examples

The following example shows how to set the DSU mode to digital-link for a controller in slot 6, on the SPA in subslot 2, on T3 controller 0:

RP/0/0/CPU0:Router(config)# controller t3 0/6/2/0

RP/0/0/CPU0:Router(config-t3)# dsu mode digital-link

Related Commands

dsu remote

To control the bandwidth usage with the remote port, use the dsu remote command in T3 or E3 configuration mode. To return to the default state, use the no form of this command.

dsu remote {disable | fullrate}

no dsu remote

Syntax Description

Defaults

Remote accept is the default.

Command Modes

T3 configuration
E3 configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

To verify the DSU remote settings configured on the interface, use the show controllers t3 or show controllers e3 command in EXEC mode.

Examples

The following example shows how to specify that the connected remote port set its bandwidth to full rate:

RP/0/0/CPU0:Router(config)# controller t3 0/6/2/0

RP/0/0/CPU0:Router(config-t3)# dsu remote fullrate

Related Commands

fdl

To enable or disable the transmission of performance reports through Facility Data Link (FDL) for a T1 channel on the channelized T3 interface, use the fdl command in T1 configuration mode. To return to the default state of performance reporting, use the no form of this command.

fdl {ansi | att} {enable | disable}

no fdl {ansi | att} {enable | disable}

Syntax Description

Defaults

The transmission of ANSI T1.403 and AT&T TR54016 performance reports through FDL are disabled.

Command Modes

T1 configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

The fdl command applies only to T1 lines and can be used only if the T1 framing type is Extended Super Frame (ESF).

To display the performance report information, use the show controllers t1 command.

Examples

The following example shows how to enable ANSI T1.403 performance reports for T1 channel 10:

RP/0/0/CPU0:Router(config)# controller t1 0/6/0/1/10

RP/0/0/CPU0:Router(config-t1e1)# fdl ansi enable

Related Commands

framing (E1)

To select the frame type for an E1 data line, use the framing command in E1 configuration mode. To disable E1 framing, use the no form of this command.

framing {crc4 | no-crc4 | unframed}

no framing {crc4 | no-crc4 | unframed}

Syntax Description

Defaults

The default is crc4.

Command Modes

E1 configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

Use the framing command in configurations in which the router or access server is intended to communicate with E1 fractional data lines. The service provider determines the framing type required for your E1 circuit.

Examples

The following example shows how to select E1 framing without CRC-4 error-monitoring capabilities:

RP/0/0/CPU0:Router(config)# controller e1 0/6/0/0/10

RP/0/0/CPU0:Router(config-t1e1)# framing no-crc4

Related Commands

framing (E3)

To select the frame type for E3 data lines, use the framing command in E3 configuration mode. To disable E3 framing, use the no form of this command.

framing {g751 | g832}

no framing {g751 | g832}

Syntax Description

Defaults

The default is G.751.

Command Modes

E3 configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

If you do not use the framing command, the default is used by the E3 controllers to automatically determine the framing type received from the far-end equipment. You can also set the framing for each T1/E1 channel by using the framing command in T1 or E1 configuration mode.

Examples

The following example shows how to select G751 as the E3 frame type:

RP/0/0/CPU0:Router(config)# controller e3 0/6/0/0

RP/0/0/CPU0:Router(config-e3)# framing g751

Related Commands

framing (T1)

To select the frame type for a T1 data line, use the framing command in T1 configuration mode. To disable T1 framing, use the no form of this command.

framing {esf | sf}

no framing {esf | sf}

Syntax Description

Defaults

The default is esf.

Command Modes

T1 configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

Use the framing command in configurations in which the router or access server is intended to communicate with T1 fractional data lines. The service provider determines the framing type required for your T1/E1 circuit.

Examples

The following example shows how to select super frame as the T1 frame type:

RP/0/0/CPU0:Router(config)# controller t1 0/6/0/0/10

RP/0/0/CPU0:Router(config-t1)# framing sf

Related Commands

framing (T3)

To select the frame type for T3 data lines, use the framing command in T3 configuration mode. To disable T3 framing, use the no form of this command.

framing {auto-detect | c-bit | m23}

no framing {auto-detect | c-bit | m23}

Syntax Description

Defaults

The default is c-bit.

Command Modes

T3 configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

If you do not use the framing command, the default is used by the T3 controllers to automatically determine the framing type received from the far-end equipment. You can also set the framing for each T1 or E1 channel by using the framing command in T1 or E1 configuration mode.

Examples

The following example shows how to select M23 as the T3 frame type:

RP/0/0/CPU0:Router(config)# controller t3 0/6/0/0

RP/0/0/CPU0:Router(config-t3)# framing m23

Related Commands

hw-module subslot cardtype

To set the ports on a SPA in T3, E3, T1, or E1 mode, use the hw-module subslot cardtype command in global configuration mode. To deselect the card type, use the no form of this command.

hw-module subslot subslot-id cardtype {e1 | e3 | t1 | t3}

no hw-module subslot subslot-id cardtype {e1 | e3 | t1 | t3}

Syntax Description

Defaults

The default for the 2-Port and 4-Port Clear Channel T3/E3 SPAs is T3.
The default for the 8-Port Channelized T1/E1 SPA is T1.

Command Modes

Global configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

The hw-module subslot cardtype command applies only to the following SPAs:

•2-Port and 4-Port Clear Channel T3/E3 SPAs

•8-Port Channelized T1/E1 SPA

By default, the 2-Port and 4-Port Clear Channel T3/E3 SPAs boot in T3 mode, while the 8-Port Channelized T1/E1 SPA boots in T1 mode. Use the hw-module subslot cardtype command to change the setting to E3 for the 2-Port and 4-Port Clear Channel T3/E3 SPAs and to E1 for the 8-Port Channelized T1/E1 SPA.

If there are nondefault configurations on the card interfaces, you must delete them before you can change the card type. Use the no controller {e1 | e3 | t1 | t3}and no interface serial commands to delete any T3, E3, T1, E1, or serial configurations.

Examples

The following example shows how to configure all ports of a 2-Port or 4-Port Clear Channel T3/E3 SPA located in slot 5, subslot 2 to E3 mode:

RP/0/0/CPU0:Router(config)# hw-module subslot 0/5/2 cardtype e3

The following example shows how to configure all ports of an 8-Port Channelized T1/E1 SPA located in slot 2, subslot 1to E1 mode:

RP/0/0/CPU0:Router(config)# hw-module subslot 0/2/1 cardtype e1

Related Commands

linecode

To select the line-code type for T1 or E1 lines, use the linecode command in T1 or E1 configuration mode. To return the line to the default line-code type, use the no form of this command.

linecode ami | b8zs | hdb3

no linecode ami | b8zs | hdb3

Syntax Description

Defaults

T1 lines: the default is B8ZS.
E1 lines: the default is AMI.

Command Modes

T1 configuration
E1 configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

Use this command in configurations where the router must communicate with T1 or E1 fractional data lines. The T1 or E1 service provider determines which line-code type is required for your T1 or E1 circuit.

Examples

The following example shows how to select AMI as the T1 line-code type:

RP/0/0/CPU0:Router(config)# controller t1 0/6/0/0

RP/0/0/CPU0:Router(config-t1)# linecode ami

The following example shows how to select HDB3 as the E1 line-code type:

RP/0/0/CPU0:Router(config)# controller e1 0/4/1/1

RP/0/0/CPU0:Router(config-e1)# linecode hdb3

Related Commands

loopback (T1/E1)

To loop individual T1 or E1 channels on the channelized T3 controller, use the loopback command in T1 or E1 configuration mode. To remove the loop, use the no form of this command.

loopback {local | network {line | payload} | remote {line {fdl {ansi | bellcore} | inband} | payload fdl ansi}}

no loopback {local | network {line | payload} | remote {line {fdl {ansi | bellcore} | inband} | payload fdl ansi}}

Syntax Description

Defaults

No loops are configured.

Command Modes

T1 configuration
E1 configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

Use the loopback command for troubleshooting purposes. To verify that a loopback is configured on the interface, use the show controllers t1 or show controllers e1 command in EXEC mode.

For E1 lines, only the local and network options are valid. For T1 lines, all listed options are valid.

Examples

The following example shows how to configure the T1 for a local loopback:

RP/0/0/CPU0:Router(config)# controller t1 0/6/0/0/10

RP/0/0/CPU0:Router(config-t1)# loopback local

Related Commands

loopback (T3/E3)

To loop the entire T3 or E3 line (all 28 T1 channels or all 21 E1 channels) on the T3 controller or E3 controller, use the loopback command in T3 or E3 configuration mode. To remove the loop, use the no form of this command.

loopback {local | {network | remote {line | payload}}

no loopback

Syntax Description

Defaults

No loops are configured on the T3 line.

Command Modes

T3 configuration
E3 configuration

Command History

Usage Guidelines

To use this command, your Cisco IOS XR software system administrator must assign you to a user group associated with a task group that includes the corresponding command task IDs. If you need assistance with your task group assignment, contact your system administrator. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.

Use the loopback command for troubleshooting purposes. To verify that a loopback is configured on the interface, use the show controllers t3 or show controllers e3 command in EXEC mode. Note that remote loopback is valid only in C-bit parity mode.

You can also loopback each T1 or E1 channel by using the loopback command in T1 or E1 configuration mode.

Examples

The following example shows how to configure the T3 for a local loopback:

RP/0/0/CPU0:Router(config)# controller t3 0/3/0/0

RP/0/0/CPU0:Router(config-t3)# loopback local

Related Commands

mdl

To configure the Maintenance Data Link (MDL) message defined in the ANSI T1.107a-1990 specification, use the mdl command in T3 configuration mode. To remove the message, use the no form of this command.

mdl {string {eic | fi | fic | gen-number | lic | port-number | unit} string} | {transmit {idle-signal
| path | test-signal} {disable | enable}}

no mdl {string {eic | fi | fic | gen-number | lic | port-number | unit} string} | {transmit {idle-signal | path | test-signal} {disable | enable}}