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.

Command Default

No default behavior or values

Command Modes

EXEC

Usage Guidelines

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.

Related Commands

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.

Command Default

No default behavior or values

Command Modes

EXEC

Usage Guidelines

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.

Related Commands

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.

Command Default

The default is 1.

Command Modes

T3 configuration

E3 configuration

T1 configuration

E1 configuration

Usage Guidelines

Use the bert error command with the bert pattern command.

Related Commands

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 the appropriate configuration mode. To revert to the default interval, use the no form of this command.

Command Default

A BERT runs for 1 minute.

Command Modes

T3 configuration

E3 configuration

T1 configuration

E1 configuration

Channel group configuration for T1 and E1

Usage Guidelines

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.

Related Commands

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.

Command Default

BERT pattern test is disabled

Command Modes

T3 configuration

E3 configuration

T1 configuration

E1 configuration

Channel group configuration for T1 and E1

Usage Guidelines

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.

Related Commands

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.

Command Default

No default behavior or values

Command Modes

EXEC

Usage Guidelines

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.

Related Commands

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.

Command Default

No default behavior or values

Command Modes

EXEC

Usage Guidelines

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.

Related Commands

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.

Command Default

The default is 224 feet.

Command Modes

T3 configuration

E3 configuration

Usage Guidelines

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.

Related Commands

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.

Command Default

db-gain-value: gain26

db-loss-value: 0db

Command Modes

T1 configuration

Usage Guidelines

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.

Related Commands

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.

Command Default

The default cable length is 533 feet.

Command Modes

T1 configuration

Usage Guidelines

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.

Related Commands

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.

Command Default

No default behavior or values

Command Modes

T1 configuration

E1 configuration

Usage Guidelines

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.

Related Commands

To clear T1 controller data, use the clear controller t1 command in EXEC configuration mode.

Command Default

No default behavior or values

Command Modes

EXEC

Usage Guidelines

When specifying a channelized T1 controller, use the following guidelines for the interface-path-id:

• The naming notation is rack/slot/module/port/T3Num/T1num.
• The slash between values is required as part of the notation.
• The following list describes the components of the notation:

  • rack—Chassis number of the rack.

  • slot—Physical slot number of the line card.

  • module—Module number or subslot (for a SPA). A physical layer interface module (PLIM) is always 0.

  • port—Physical port number of the interface.

  • T3num—T3 controller number.

  • T1num—T1 controller number.

• If specifying a virtual interface, the number range varies, depending on interface type.
• When specifying a virtual tributary group, the naming notation is rack/slot/module/port/vtg/vt. 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 or subslot (for a SPA). A physical layer interface module (PLIM) is always 0.

  • port—Physical port number of the interface.

  • vtg—Virtual tributary group.

  • vt—Virtual tributary instance.

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

Related Commands

To clear T3 controller data, use the clear controller t3 command in EXEC configuration mode.

Command Default

No default behavior or values

Command Modes

EXEC

Usage Guidelines

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

• When specifying a T3 controller, the naming notation is rack/slot/module/port/T3num. 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 or SIP.

  • module—Module number or subslot (for a SPA). A physical layer interface module (PLIM) is always 0.

  • port—Physical port number of the interface.

  • T3num—T3 controller number.

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

Related Commands

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.

Command Default

The default clock source is internal.

Command Modes

T1 configuration

E1 configuration

Usage Guidelines

Related Commands

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.

Command Default

The default clock source is internal.

Command Modes

T3 configuration

E3 configuration

Usage Guidelines

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.

Related Commands

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.

Command Default

No default behavior or values

Command Modes

Global configuration

Usage Guidelines

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.

Related Commands

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.

Command Default

No default behavior or values

Command Modes

Global configuration

Usage Guidelines

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.

Related Commands

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.

Command Default

No default behavior or values

Command Modes

Global configuration

Usage Guidelines

When specifying a channelized T1 controller, use the following guidelines for the interface-path-id:

• The naming notation is rack/slot/module/port/T3Num/T1num.
• The slash between values is required as part of the notation.
• The following list describes the components of the notation:

  • rack—Chassis number of the rack.

  • slot—Physical slot number of the line card.

  • module—Module number or subslot (for a SPA). A physical layer interface module (PLIM) is always 0.

  • port—Physical port number of the interface.

  • T3num—T3 controller number.

  • T1num—T1 controller number.

• If specifying a virtual interface, the number range varies, depending on interface type.
• When specifying a virtual tributary group, the naming notation is rack/slot/module/port/vtg/vt. 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 or subslot (for a SPA). A physical layer interface module (PLIM) is always 0.

  • port—Physical port number of the interface.

  • vtg—Virtual tributary group.

  • vt—Virtual tributary instance.

  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.

  If the T1 framing type is super frame (SF), you should consider disabling yellow alarm detection as the yellow alarm can be incorrectly detected with SF framing.

  Serial interface may flap and eventually, go down if yellow alarm detection is not disabled on its T1 controller configured with SF framing.

Related Commands

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.

Command Default

No default behavior or values

Command Modes

Global configuration

Usage Guidelines

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

• When specifying a T3 controller, the naming notation is rack/slot/module/port/T3num. 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 or SIP.

  • module—Module number or subslot (for a SPA). A physical layer interface module (PLIM) is always 0.

  • port—Physical port number of the interface.

  • T3num—T3 controller number.

• 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.

Related Commands

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.

Command Default

The default is 10 seconds.

Command Modes

T1 configuration

E1 configuration

Usage Guidelines

Related Commands

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.

Command Default

The default is 10 seconds.

Command Modes

T3 configuration

E3 configuration

Usage Guidelines

Related Commands

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.

Command Default

The default is 2.5 seconds.

Command Modes

T1 configuration

E1 configuration

Usage Guidelines

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

Related Commands

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.

Command Default

The default is 2.5 seconds.

Command Modes

T3 configuration

E3 configuration

Usage Guidelines

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

Related Commands

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.

Command Default

No description is configured.

Command Modes

T1 configuration

E1 configuration

Usage Guidelines

Related Commands

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.

Command Default

No description is configured.

Command Modes

T3 configuration

E3 configuration

Usage Guidelines

Related Commands

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.

Syntax Description

This command has no keywords or arguments.

Command Default

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

Usage Guidelines

This command does not have a no form.

Related Commands

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.

Syntax Description

This command has no keywords or arguments.

Command Default

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

Usage Guidelines

This command does not have a no form.

Related Commands

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.

Command Default

The default bandwidth is 44210.

Command Modes

T3 configuration

E3 configuration

Usage Guidelines

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 a ADC Kentrox T3 link, bandwidth must be in multiples of 500 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.

Related Commands

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.

Command Default

The default is cisco.

Command Modes

T3 configuration

E3 configuration

Usage Guidelines

Refer to Table 1 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.

Related Commands

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.

Command Default

Remote accept is the default.

Command Modes

T3 configuration

E3 configuration

Usage Guidelines

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

Related Commands

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.

Command Default

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

Command Modes

T1 configuration

Usage Guidelines

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.

Related Commands

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.

Command Default

The default is crc4.

Command Modes

E1 configuration

Usage Guidelines

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.

Related Commands

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.

Command Default

The default is G.751.

Command Modes

E3 configuration

Usage Guidelines

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.

Related Commands

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.

Command Default

The default is esf.

Command Modes

T1 configuration

Usage Guidelines

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.

Related Commands

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.

Command Default

The default is c-bit.

Command Modes

T3 configuration

Usage Guidelines

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.

Related Commands

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.

Command Default

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

Usage Guidelines

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.

Related Commands

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.

Command Default

T1 lines: the default is B8ZS.

E1 lines: the default is AMI.

Command Modes

T1 configuration

E1 configuration

Usage Guidelines

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.

Related Commands

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.

Command Default

No loops are configured.

Command Modes

T1 configuration

E1 configuration

Usage Guidelines

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.

Related Commands

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.

Command Default

No loops are configured on the T3 line.

Command Modes

T3 configuration

E3 configuration

Usage Guidelines

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.

Related Commands

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.

Command Default

No MDL message is configured.

Command Modes

T3 configuration

Usage Guidelines

Use the show controllers t3 command to display MDL information (received strings). MDL information is displayed only when framing is set to C-bit.

Note	MDL is supported only when the DS3 framing is C-bit parity.

Related Commands

To set the mode of the T3/E3 or T1/E1 controller, use the mode command in T3, E3, T1, or E1 configuration mode. To disable the controller mode, use the no form of this command.

Command Default

The default for the 2-Port and 4-Port Clear Channel T3/E3 SPAs is serial.

There is no default for the 2-Port and 4-Port Channelized T3 SPAs.

Command Modes

T3 configuration

E3 configuration

T1 configuration

E1 configuration

Usage Guidelines

You can change the mode of a controller only when there are no subinterfaces defined for the controller. For example, if you previously defined channelized T1 subinterfaces on a T3 interface and now you want to change this to E1 subinterfaces or a clear channel interface, you must first clear the subinterfaces. To do this, use the no controller t1 command for all defined T1/E1 subinterfaces. If you have defined serial parameters, you also need to use the no interface serial command.

For channelized SPAs, you must use the mode command before you can configure any channelized controllers.

Related Commands

To specify the national reserved bits for an E1 port, use the national bits command in E1 configuration mode. To revert to the default national bits, use the no form of this command.

Command Default

The default is 0, which corresponds to 0x1f.

Command Modes

E1 configuration

Usage Guidelines

Related Commands

To enable or disable the national reserved bit pattern on an E3 port, use the national bits command in E3 configuration mode. To revert to the default value, use the no form of this command.

Command Default

The default is enable.

Command Modes

E3 configuration

Usage Guidelines

Related Commands

To display information about the E1 links and hardware and software drivers for the E1 controller, use the show controllers e1 command in EXEC mode.

Command Default

No default behavior or values

Command Modes

EXEC

Usage Guidelines

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.

Related Commands

To display information about the E3 links and hardware and software drivers for the E3 controller, use the show controllers e3 command in EXEC mode.