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Cisco IOS Interface Command Reference, Release 12.2 T
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Interface Commands (alarm-interface through cut-through
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Interface commands (dce-terminal-timing enable through interface content-engine)
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Interface Commands (interface fastethernet through logging event)
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Interface commands (main-fiber port through serial restart-delay)
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Interface Commands (service single-slot-reload-enable through show interfaces hssi)
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Interface Commands (show interfaces loopback through show pc hog-info)
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Interface Commands (show pas caim through srp tx-traffic-rate)
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Interface Commands (storm-control through yellow)
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Hardware Management Commands (au-3 through clock source (T3/E3 controller))
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Hardware Management Commands (controller through service-module t1 timeslots)
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Hardware Mangement Commands (show controllers cbus through show controllers token)
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Hardware Management Commands (show controllers vg-anylan through t1 yellow)
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Dial Shelf Management Commands (clear dsip tracing through show redundancy)
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Index
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Table Of Contents
clock source (SONET controller)
clock source (T1/E1 controller)
clock source (T3/E3 controller)
Hardware Management Commands
This chapter contains descriptions for the hardware management commands.
au-3
To configure a particular Administrative Unit type 3 (AU-3) of an E1 line that has been mapped to an AU-3, use the au-3 command in controller configuration mode.
au-3 au-3-number
Syntax Description
Defaults
No default behavior or values
Command Modes
Controller configuration
Command History
12.0(14)S
This command was introduced.
12.2(15)T
This command was integrated into Cisco IOS Release 12.2(15)T.
Usage Guidelines
An administrative unit group (AUG) of an STM-1 can be derived from either AU-3s or an AU-4. Use the aug mapping au-3 configuration controller command to map the AUG to an AU-3 with the following muxing/alignment/mapping:
C-12 <--> VC-12 <--> TU-12 <--> TUG-2 <--> VC-3 <--> AU-3 <--> AUG
Configuring the au-3 command enables you to enter configuration controller au3 command mode and creates a serial interface with the following name format:
slot/port-adapter/port.au-3-number/tug-2-number/e1-number
The aug mapping au-3 and au-3 commands are available only when SDH framing is configured.
Examples
The following example shows how to configure AUG mapping to be derived from an AU-3 and selects AU-3 3 to configure as a serial interface:
Router(config)# controller sonet 2/0/0Router(config-controller)# aug mapping au-3Router(config-ctrlr-au3)# au-3 3Related Commands
au-4 tug-3
Specifies a TUG-3 for configuration.
aug mapping
Configures the AUG mapping mode of the PA-MC-STM-1 to AU-3.
au-4 tug-3
To specify the Administrative Unit type 4 (AU-4) and Tributary Unit group type 3 (TUG-3) number of an E1 line that has been mapped to an AU-4, use the au-4 tug-3 command in controller configuration mode.
au-4 au-4-number tug-3 tug-3-number
Syntax Description
au-4-number
Number in the range from 1 to N where N is the STM level. Default is 1.
tug-3-number
Number in the range from 1 to 3.
Defaults
Default au-4-number value for STM-1 card is 1.
Command Modes
Controller configuration
Command History
12.0(14)S
This command was introduced.
12.2(15)T
This command was integrated into Cisco IOS Release 12.2(15)T.
Usage Guidelines
An AUG of an STM-1 can be derived from either AU-3s or an AU-4. Use the aug mapping au-4 configuration controller command to map the AUG to an TUG-3 with the following muxing/alignment/mapping:
C-12 <--> VC-12 <--> TU-12< --> TUG-2 <--> TUG-3 <--> VC-4 <--> AU-4 <--> AUG
Configuring the au-4 command enables you to enter configuration controller tug3 command mode and creates a serial interface with the following name format:
slot/port-adapter/port.au-4-number/tug-2-number/e1-number
The aug mapping au-4 and au-4 tug-3 commands are available only when SDH framing is configured.
Examples
The following example shows how to configure AUG mapping to be derived from a TUG-3 and selects TUG-3 1 of AU-4 1:
Router(config)# controller sonet 2/0/0Router(config-controller)# aug mapping au-4Router(config-ctrlr-tug3)# au-4 1 tug-3 1Related Commands
au-3
Specifies an AU-3 for configuration.
aug mapping
Configures the AUG mapping mode.
aug mapping
To configure administrative unit group (AUG) mapping when SDH framing is selected, use the aug mapping command in controller configuration mode.
aug mapping {au-3 | au-4}
Syntax Description
Defaults
au-4
Command Modes
Controller configuration
Command History
Usage Guidelines
In SDH, there are two possible mapping/multiplexing schemes for most payload types: ANSI and ETSI.
In ANSI mapping, the Low Order payloads are aggregated into a VC-3 High Order Path. An AU pointer is added to the VC-3 to create an AU-3. Three such AU-3s are then synchronously multiplexed into an AUG. The multiplexing scheme is as follows:
... VC-3 <-> AU-3 (x3) <-> AUG <-> STM-1
SDH ANSI mapping is very similar to the SONET frame structure.
In ETSI mapping, the Low Order payloads are aggregated into a VC-4 High Order Path. An AU pointer is added to the VC-4 to create an AU-4 (Administrative Unit type 4). One AU-4 is "multiplexed" into an AUG (AU group), which is to say, the AUG is, in fact, equivalent to an AU-4. The multiplexing scheme is as follows:
... TUG-3 (x3) <-> VC-4 <-> AU-4 (x1) <-> STM-1
This command is available only when SDH framing is configured.
This command does not have a no form because data must flow using one of the two mapping/multiplexing schemes.
Examples
The following example shows how to configure AU-3 mapping for the STM-1 trunk card:
Router(config)# controller sonet 1/0Router(config-controller)# aug mapping au-3b2 sd-ber
To set the signal degrade bit-error rate (BER) threshold values, use the b2 sd-ber command in controller configuration mode. To return to the default setting, use the no form of this command.
b2 sd-ber rate
no b2 sd-ber
Syntax Description
rate
Bit-error rate from 3 to 9 (10-n). The value of 9 represents better quality, and the value of 3 represents lower quality. The default is 6.
Defaults
rate: 6
Command Modes
Controller configuration
Command History
Usage Guidelines
Use this command to configure the threshold for degradation of quality of signal with b2 errors.
Examples
The following example shows how to configure a signal degrade BER threshold value of 7 on the SONET controller:
Router(config)# controller sonet 1/0Router(config-controller)# b2 sd-ber 7Related Commands
b2 sf-ber
To set the signal failure bit-error rate (BER) threshold values, use the b2 sf-ber command in controller configuration mode. To return to the default setting, use the no form of this command.
b2 sf-ber rate
no b2 sf-ber rate
Syntax Description
rate
Bit-error rate from 3 to 9 (10-n). The value of 9 represents better quality, and the value of 3 represents lower quality. The default is 3.
Defaults
rate: 3
Command Modes
Controller configuration
Command History
Usage Guidelines
Use this command to configure the threshold for failure of quality of signal with b2 errors. The value of 9 represents better quality and the value of 3 represents lower quality.
Examples
The following example shows how to configure a signal failure BER threshold value of 7 on the SONET controller:
Router(config)# controller sonet 1/0Router(config-controller)# b2 sf-ber 7Related Commands
bert abort
To end a bit error rate testing session, use the bert abort command in privileged EXEC mode.
bert abort
Syntax Description
This command has no arguments or keywords.
Command Modes
Privileged EXEC
Command History
12.0(2)XD
This command was introduced.
12.0(3)T
This command was integrated into Cisco IOS Release 12.0(3) T.
Usage Guidelines
Use the bert abort command to cancel bit error rate testing on each port of the Cisco AS5300 router.
The bit error rate test (BERT) feature enables you to test the quality of the connected PRI links by direct comparison of a pseudorandom or repetitive test pattern with an identical locally generated test pattern.
Examples
The following is sample output from the bert abort command when no bit error rate test is running:
Router# bert abortRouter#17:53:33: There is no BERT Test running ....The following is sample output from the bert abort command when a bit error rate test is running:
Router# bert abortDo you really want to abort the current BERT [confirm] Y17:56:56: %BERT-6-BERT_RESULTS: Controller T1 0 Profile default : The Test wasaborted by UserRelated Commands
Starts a bit error rate test for a particular port.
Sets up various bit error rate testing profiles.
bert controller
To start a bit error rate test for a particular port, use the bert controller command in privileged EXEC mode.
bert controller [type-controller] {[last-controller] | profile [number | default]}
Syntax Description
Defaults
The default profile number is 0.
Command Modes
Privileged EXEC
Command History
12.0(2)XD
This command was introduced.
12.0(3)T
This command was integrated into Cisco IOS Release 12.0(3)T.
Usage Guidelines
Use the bert controller command to start a bit error rate test for a particular port on a Cisco AS5300 router.
Quality Testing
The bit error rate tester (BERT) feature enables you to test the quality of the connected PRI links by direct comparison of a pseudorandom or repetitive test pattern with an identical locally generated test pattern.
E1 Controllers
The E1 controller cannot be set in loopback mode from the Cisco AS5300. For the bert controller command to work correctly with the E1 controller, the controller must be configured as a channel group or CAS and the line must be configured as a remote loop from the switch side of the link.
Examples
This sample display shows output from the bert controller command:
Router# bert controller T1 0 profile 0Press <Return> to start the BERT [confirm] Y17:55:34: %BERT-6-BERT_START: Starting BERT on Interface 0 with Profile defaultData in current interval (10 seconds elapsed):0 Line Code Violations, 0 Path Code Violations0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail SecsTable 53 describes the significant fields shown in the sample display for the bert controller command.
Related Commands
Aborts a bit error rate testing session.
Sets up various bit error rate testing profiles.
bert pattern (T1/E1)
To enable a bit error rate (BER) test pattern on a T1 or E1 line, use the bert pattern command in controller configuration mode. To disable a BER test pattern, use the no form of this command.
bert pattern {2^23 | 2^20 | 2^20-QRSS | 2^15 | 2^11 | 1s | 0s | alt-0-1} interval time
no bert pattern {2^23 | 2^20 | 2^20-QRSS | 2^15 | 2^11 | 1s | 0s | alt-0-1} interval time
Syntax Description
Defaults
No bert pattern is in effect.
Command Modes
Controller configuration
Command History
Usage Guidelines
BER testing is supported on each of the T1 or E1 links, is done only over an unframed T1 or E1 signal, and is run on only one port at a time.
To view the BER test results, use the show controllers atm EXEC command. The BERT results include the following information:
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Type of test pattern selected
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When the T1 or E1 line has a BER test running, the line state is DOWN and the status field shows the current/last result of the test.
The bert pattern command is not written to NVRAM. This command is only used to test the T1 or E1 line for a short predefined interval and to avoid accidentally saving the command, which could cause the interface not to come up the next time the router reboots.
Examples
In the following example on a Cisco 7200 series router, a BER test pattern of all zeros is run for 30 minutes on T1 line 0 on the port adapter in slot 9:
interface atm 9/0bert pattern 0s interval 30Related Commands
bert pattern (T3/E3)
To enable a bit error rate (BER) test pattern on a T3 or E3 controller, use the bert pattern command in controller configuration mode. To disable a BER test pattern, use the no form of this command.
bert pattern {2^23 | 2^20 | 2^15 | 1s | 0s | alt-0-1} interval time
no bert pattern
Syntax Description
Defaults
Disabled
Command Modes
Controller configuration
Command History
Usage Guidelines
BER testing is supported on T3/E3 links and is done only over framed T3 or E3 signals, unless E3 framing is in bypass mode.
To display the BER test results, use the show controllers t3 or show controllers e3 EXEC command. The BER test results include the following information:
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•
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When the T3 or E3 line has a BER test running, the line state is DOWN and the status field shows the current or last result of the test.
The bert pattern (T3/E3) command is not written to NVRAM. This command is used only to test the T3 or E3 line for a short predefined interval and to avoid accidentally saving the command, which could cause the interface not to come up the next time the router reboots.
Examples
In the following example, a BER test pattern of all zeros is run for 30 minutes on the T3 controller in slot 1:
controller t3 1/0bert pattern 0s interval 30Related Commands
show controllers e3
Displays information about E3 controllers.
show controllers t3
Displays information about T3 controllers.
bert profile
To set up various bit error rate testing profiles, use the bert profile command in global configuration mode. To disable the particular bit error rate test (BERT) profile indicated by profile number, use the no form of this command.
bert profile number pattern pattern threshold threshold error-injection err_inj duration time
no bert profile number pattern pattern threshold threshold error-injection err_inj duration time
Syntax Description
Defaults
The default profile created internally by the system has parameters that cannot be changed. This profile has been defined so that you can execute BERT on a line without having to configure a new profile. The default profile is displayed when the running configuration is displayed and is not stored in NVRAM:
bert profile number pattern 220-0151QRSS threshold 10^-6 error-injection none duration 10
Command Modes
Global configuration
Command History
12.0(2)XD
This command was introduced.
12.0(3)T
This command was integrated into Cisco IOS Release 12.0 T.
Usage Guidelines
Use the bert profile command to set up bit error rate testing profiles for the Cisco AS5300 router.
The bit error rate test (BERT) feature enables you to test the quality of the connected PRI links by direct comparison of a pseudorandom or repetitive test pattern with an identical locally generated test pattern. A BERT profile is a set of parameters related to a BERT test and is stored as part of the configuration in the NVRAM. You can define up to 15 BERT profiles on the system. By setting up the BERT profiles in this way, you do not have to enter the parameters each time you want to run a BERT—just select the number of the BERT profile you want to run.
Examples
The following example shows a configured BERT profile number 1 to have a 0s test pattern, with a 10-2 threshold, no error injection, and a duration of 125 minutes:
Router(config)# bert ?profile Profile Number for this BERT configurationRouter(config)# bert profile ?<1-15> BERT Profile NumberRouter(config)# bert profile 1 pattern 0s threshold 10^-2 error-injection none duration 125Related Commands
Aborts a bit error rate testing session.
Starts a bit error rate test for a particular port.
cablelength
To specify the distance of the cable from the routers to the network equipment, use the cablelength command in controller configuration mode. To restore the default cable length, use the no form of this command.
cablelength feet
no cablelength
Syntax Description
Defaults
224 feet for a CT3IP interface processor and Clear Channel T3/E3 network module
49 feet for PA-T3 and PA-2T3 port adaptersCommand Modes
Controller configuration
Command History
Usage Guidelines
The default cable length of 224 feet is used by the CT3IP interface processor and the Clear Channel T3/E3 network module.
The default cable length of 49 feet is used by the PA-T3 and PA-2T3 port adapters.
Note
Examples
The following example sets the cable length for the router to 300 feet:
Router(config)# controller t3 9/0/0Router(config-controller)# cablelength 300cablelength 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 controller configuration or interface 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
Syntax Description
Defaults
Receiver gain of 26 dB and transmitter loss of 0 dB.
Command Modes
Controller configuration for the Cisco AS5800 and Cisco MC3810.
Interface configuration for the Cisco 2600 and Cisco 3600 series routers.
Command History
Usage Guidelines
Cisco AS5800 and Cisco MC3810
Use this command for configuring the controller T1 interface on the Cisco AS5200 access server, on the Cisco AS5800 universal access server, or on the Cisco MC3810 multiservice access concentrator. The cablelength long command is used to configure DS1 links (meaning, to build CSU/DSU links) when the cable length is no longer than 655 feet.
On the Cisco MC3810, this command is supported on T1 controllers only and applies to Voice over Frame Relay, Voice over ATM, and Voice over HDLC.
Note
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, while 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.
Cisco 2600 and Cisco 3600 Series Routers
This command is supported on T1 long-haul links only. If you enter the cablelength long command on a DSX-1 (short-haul) interface, the command is rejected.
The transmit attenuation value is best obtained by experimentation. If the signal received by the far-end equipment is too strong, reduce the transmit level by entering additional attenuation.
Examples
Cisco AS5800 and Cisco MC3810
The following example increases the receiver gain by 36 decibels and decreases the transmitting pulse by 15 decibels for a long cable on a Cisco AS5800:
AS5800(config)# controller t1 0AS5800(config-controller)# cablelength long gain36 -15dbThe following example configures the cable length for controller T1 0 on a Cisco MC3810 to a decibel pulse gain of 36 decibels and a decibel pulse rate of -22.5 decibels:
MC3810(config)# controller t1 0MC3810(config-controller)# cablelength long gain36 -22.5dbCisco 2600 and Cisco 3600 Series Routers
On a Cisco 2600 or Cisco 3600 series router, the following example specifies a pulse gain of 36 decibels and a decibel pulse rate of -7.5 decibels:
Router(config)# interface atm 0/2Router(config-if)# cablelength long gain36 -7.5dbRelated Commands
cablelength short
To set a cable length 655 feet or shorter for a DS1 link on the Cisco MC3810 or Cisco 2600 and 3600 series routers, use the cablelength short command in controller configuration or interface configuration mode. This command is supported on T1 controllers only. To delete the cablelength short value, use the no form of this command.
cablelength short length
no cablelength short
Syntax Description
Defaults
The default is 133 feet for the Cisco AS5200 access server, Cisco AS5800 universal access server, and Cisco MC3810 multiservice access concentrator.
There is no default value or behavior for the Cisco 2600 and Cisco 3600 series routers.
Command Modes
Controller configuration for the Cisco AS5200 access server, Cisco AS5800 universal access server, and Cisco MC3810 multiservice access concentrator.
Interface configuration for the Cisco 2600 and Cisco 3600 series routers.
Command History
Usage Guidelines
Cisco AS5200 Access Server, Cisco AS5800 Universal Access Server, and Cisco MC3810 Multiservice Access Concentrator
On the Cisco MC3810, the cablelength short command is used to configure DSX-1 links when the cable length is 655 feet or less than 655 feet. On the Cisco MC3810, this command is supported on T1 controllers only.
Note
Cisco 2600 and Cisco 3600 Series Routers
This command is supported on T1 short-haul links only. If you enter the cablelength short command on a long-haul interface, the command is rejected.
To set cable lengths longer than 655 feet, use the cablelength long command.
Examples
Cisco AS5200 Access Server, Cisco AS5800 Universal Access Server, and Cisco MC3810 Multiservice Access Concentrator
In the following example, the cable length is set to 266 for the T1 controller in slot 0 on dial shelf 0:
Router# configure terminalRouter(config)# controller t1 1/1/0Router(config-controller)# cablelength short 266router (config-controller)# exitRouter(config)# exitRouter#Cisco 2600 and Cisco 3600 Series Routers
On a Cisco 2600 or 3600 series router, the following example specifies a cable length from 0 to 133 feet:
Router(config)# interface atm 0/2Router(config-if)# cablelength short 133
Related Commands
Increases the pulse of a signal at the receiver and decreases the pulse from the sender using pulse equalization and line build-out.
channelized
To configure the T3 controller for channelized mode, use the channelized command in configuration controller mode. To configure the T3 controller for unchannelized mode, use the no channelized form of this command.
channelized
no channelized
Syntax Description
This command has no arguments or keywords.
Defaults
Channelized: maximum transmission unit (MTU) size is set to 1500.
Unchannelized: MTU size is set to 4470Command Modes
Configuration controller
Command History
Usage Guidelines
Use the no channelized configuration controller command to configure the T3 controller for unchannelized mode. When you configure the PA-MC-2T3+ port adapter on a Cisco 7500 series router with the no channelized command, the MTU size is set to 4470. In channelized mode, the default MTU size is 1500. The change in MTU sizes will cause a memory recarve and CBus complex to occur, disrupting all traffic on the router for several minutes.
The following message will be displayed when switching between channelized and unchannelized modes on a Cisco 7500 series router:
Change to subrate mode will cause cbus complex reset. Proceed? [yes/no]: YType Y for "yes" at the end of the warning. At the prompt, type ^Z to exit. You will exit configuration mode and enter unchannelized mode.
Examples
The following example configures unchannelized mode on a PA-MC-2T3+ port adapter in slot 1 of a Versatile Interface Processor version 2 (VIP2) or VIP4 in a Cisco 7500 series router:
Router# configure terminalEnter configuration commands, one per line. End with CNTL/Z.Router(config)# controller T3 1/1/0Router(config-controller)# no channelizedChange to subrate mode will cause cbus complex reset. Proceed? [yes/no]: Y^Zclear controller
To reset the T1 or E1 controller, use the clear controller command in user EXEC and privileged EXEC mode.
Cisco 7200 Series and Cisco 7500 Series Routers
clear controller {t1 | e1} slot/port
Cisco AS5200 Series and Cisco AS5300 Series Routers
clear controller {t1 | e1} number
Syntax Description
Command Modes
User EXEC
Privileged EXECCommand History
Examples
The following example resets the T1 controller at slot 4, port 0 on a Cisco 7500 series router:
Router# clear controller t1 4/0The following example resets the E1 controller at NIM 0:
Router# clear controller e1 0Related Commands
clear service-module serial
To reset an integrated CSU/DSU, use the clear service-module serial command in privileged EXEC configuration mode.
clear service-module serial number
Syntax Description
Command Modes
Privileged EXEC
Command History
Usage Guidelines
Use this command only in severe circumstances (for example, when the router is not responding to a CSU/DSU configuration command).
This command terminates all DTE and line loopbacks that are locally or remotely configured. It also interrupts data transmission through the router for up to 15 seconds. The software performs an automatic software reset in case of two consecutive configuration failures.
The CSU/DSU module is not reset with the clear interface command.
Caution
Examples
The following example resets the CSU/DSU on a router:
Router# clear service-module serial 0Router#Related Commands
Clears the interface counters.
Performs self-tests on an integrated CSU/DSU serial interface module, such as a 4-wire, 56/64-kbps CSU/DSU.
clock rate
To configure the clock rate for the hardware connections on serial interfaces such as network interface modules (NIMs) and interface processors to an acceptable bit rate, use the clock rate command in interface configuration mode. To remove the clock rate if you change the interface from a DCE to a DTE device, use the no form of this command. Using the no form of this command on a DCE interface sets the clock rate to the hardware-dependent default value.
clock rate bps
no clock rate
Syntax Description
Defaults
No clock rate is configured.
Command Modes
Interface configuration
Command History
Usage Guidelines
Cable Length
Be aware that the fastest speeds might not work if your cable is too long, and that speeds faster than 148,000 bits per second are too fast for EIA/TIA-232 signaling. It is recommended that you only use the synchronous serial EIA/TIA-232 signal at speeds up to 64,000 bits per second. To permit a faster speed, use EIA/TIA-449 or V.35.
Synchronous Serial Port Adapters
For the synchronous serial port adapters (PA-8T-V35, PA-8T-X21, PA-8T-232, and PA-4T+) on Cisco 7200 series routers, and on second-generation Versatile Interface Processors (VIP2s) in Cisco 7500 series routers, the clock rate you enter is rounded (if needed) to the nearest value that your hardware can support. To display the clock rate value for the port adapter, use the more system:running-config command.
If you plan to netboot your router over a synchronous serial port adapter interface and have a boot image prior to Cisco IOS Release 11.1(9)CA that does not support nonstandard (rounded) clock rates for the port adapters, you must use one of the following standard clock rates:
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•
•
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•
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Examples
The following example sets the clock rate on the first serial interface to 64,000 bits per second:
Router(config)# interface serial 0Router(config-if)# clock rate 64000The following example sets the clock rate on a synchronous serial port adapter in slot 5, port 0 to 1234567. In this example, the clock rate is adjusted to 1151526 bps.
Router(config)# interface serial 5/0Router(config-if)# clock rate 1234567%Clockrate rounded to nearest value that your hardware can support.%Use Exec Command 'more system:running-config' to see the value rounded to.The following example configures serial interface 5/0 with a clock rate that is rounded to the nearest value that is supported by the hardware:
Router# configure terminalEnter configuration commands, one per line. End with CNTL/Z.Router(config)# interface serial 5/0Router(config-if)# clock rate 1234567%Clockrate rounded to nearest value that your hardware can support.%Use Exec Command 'more system:running-config' to see the value rounded to.Router(config-if)# exitRouter(config)#The following example shows how to determine the exact clock rate that the serial interface was rounded to using the more system:running-config command. This example shows only the relevant information displayed by the more system:running-config command; other information was omitted.
Router# more system:running-configBuilding configuration......!interface Serial5/0no ip addressclockrate 1151526!...clock rate line
To configure the line clock rate for serial ports 0 or 1 in DTE mode, use the clock rate line command in interface configuration mode. To cancel the clock rate line value, use the no form of this command.
clock rate line rate
no clock rate line rate
Syntax Description
Defaults
No clock rate is set.
Command Modes
Interface configuration
Command History
11.3(1)MA
This command was introduced on the Cisco MC3810 multiservice access concentrator.
Usage Guidelines
This command specifies the rate of the incoming clock so that the appropriate internal clock scaling can be performed.
To configure the clock rate for a serial port in DTE mode, use the clock rate network-clock command.
Examples
The following configures the clock rate on serial 1 in DTE mode:
interface serial 1clock rate line 2048Related Commands
clock rate network-clock
To configure the network clock rate (speed) for serial ports 0 or 1 in DCE mode, use the clock rate network-clock command in interface configuration mode. To cancel the network clock speed value, use the no form of this command.
clock rate network-clock rate
no clock rate network-clock rate
Syntax Description
Defaults
No clock rate is set.
Command Modes
Interface configuration
Command History
11.3(1)MA
This command was introduced on the Cisco MC3810 multiservice access concentrator.
Usage Guidelines
This command uses a synchronized clock on the serial port. The use of this command allows the clock on the serial port to be synchronized with the clock source of controller T1 0.
To configure the clock rate for a serial port in DTE mode, use the clock rate line command.
Examples
The following example configures the clock rate on serial port 1 in DCE mode:
interface serial 1clock rate network-clock 2048Related Commands
clock source
To configure the clock source of a DS1 link, enter the clock source command in interface configuration or ATM interface configuration mode. To restore the default line setting, use the no form of this command.
clock source {line | internal | loop-timed}
no clock source
Syntax Description
Defaults
The default value is line.
Command Modes
Interface configuration
ATM interface configuration for the Cisco 2600 and 3600 series routers.
Command History
Usage Guidelines
This command sets clocking for individual T1/E1 links.
Make sure that you specify the clock source correctly for each link, even if you are planning to specify that a certain link will provide clocking for all the links in an IMA group. Because links may be taken in and out of service, requiring that the system select another link for common clocking, any link in an IMA group may provide the common clock.
If the ATM interface is part of an IMA group, you can use the loop-timed keyword to specify that the clock source is the same as the IMA group clock source.
Examples
On a Cisco 2600 or 3600 series router, the following example specifies an internal clock source for the link:
Router(config)# interface atm 0/2Router(config-if)# clock source internalRelated Commands
clock source (AS5200)
To select the clock source for the time-division multiplexing (TDM) bus in a Cisco AS5200 access server, use the clock source command in interface configuration mode. To restore the clock source to its default setting, use the no form of this command.
clock source {line {primary | secondary} | internal}
no clock source line {primary | secondary}
Syntax Description
Defaults
The primary TDM clock source is from the T1 0 controller.
The secondary TDM clock source is from the T1 1 controller.
Command Modes
Interface configuration
Command History
Usage Guidelines
To use the clocking coming in from a T1 line, configure the clock source line primary command on the T1 interface that has the most reliable clocking. Configure the clock source line secondary command on the T1 interface that has the next best known clocking. With this configuration, the primary line clocking is backed up to the secondary line if the primary clocking shuts down.
Examples
The following example configures the Cisco AS5200 access server to use T1 controller 0 as the primary clock source and T1 controller 1 as the secondary clock source:
Router(config)# controller t1 0Router(config-controller)# clock source line primaryRouter(config)# controller t1 1Router(config-controller)# clock source line secondaryclock source (controller)
To set the T1-line clock source for the Multichannel Interface Processor (MIP) in the Cisco 7200 series and Cisco 7500 series, the NPM in the Cisco 4000 series, a T3 interface, or a PA-T3 serial port adapter, use the clock source command in controller configuration mode. To restore the clock source to its default setting, use the no form of this command.
clock source {line {primary | secondary} | internal}
no clock source
Syntax Description
Defaults
The default primary TDM clock source is from the T0 controller.
The default secondary TDM clock source is from the T1 controller.
The default clock for the interface's transmitted data is from a clock recovered from the line's receive data stream from the PA-T3 serial port adapter.
Command Modes
Controller configuration
Command History
10.3
This command was introduced.
11.1 CA
This command was modified to include the T3 serial port adapter and PA-T3 serial port adapter.
Usage Guidelines
This command applies to a Cisco 4000, Cisco 7000 series, Cisco 7200 series, or Cisco 7500 series router. A T3 interface on a PA-T3 serial port adapter can clock its transmitted data either from its internal clock or from a clock recovered from the line's receive data stream.
To use the clocking coming in from a T1 line, configure the clock source line primary command on the controller that has the most reliable clocking. Configure the clock source line secondary command on the controller that has the next best known clocking. With this configuration, the primary line clocking is backed up to the secondary line if the primary clocking shuts down.
Examples
The following example configures the Cisco AS5200 to use the T0 controller as the primary clocking source and the T1 controller as the secondary clocking source:
AS5200(config)# controller t1 0AS5200(config-if)# clock source line primaryAS5200(config-if)# exitAS5200(config)# controller t1 1AS5200(config-if)# clock source line secondaryThe following example specifies the T3 interface to clock its transmitted data from its internal clock:
Router(config)# interface serial 1/0Router(config-if)# clock source internalRelated Commands
Selects the frame type for the T1 or E1 data line.
Selects the linecode type for T1 or E1 line.
clock source (controller J1)
To configure the clock source for a J1 controller, use the clock source command in controller configuration mode. To restore the clock source to its default setting, use the no form of this command.
clock source {line | internal}
no clock source
Syntax Description
Defaults
Clock source is line for the J1 controller.
Command Modes
Controller configuration
Command History
11.1 T
This command was introduced.
12.2(8)T
The command was introduced as a J1 controller configuration for the Cisco 2600 and Cisco 3600 series.
Usage Guidelines
If multiple network modules are present in the router, then each J1 controller must be given a separate priority by configuration of the network-clock-select command. The controller having the highest priority will drive the internal clock.
Examples
The following example configures the clock source for line:
Router# configure terminalEnter configuration commands, one per line. End with CNTL/Z.Router(config)# controller j1 3/0Router(config-controller)# clock source line
Related Commands
clock source (CT3IP)
To specify where the clock source is obtained for use by the Channelized T3 Interface Processor (CT3IP) in Cisco 7500 series routers, use the clock source command in controller configuration mode. To restore the default clock source, use the no form of this command.
clock source {internal | line | loop-timed}
no clock source
Syntax Description
Defaults
The internal clock source is used.
Command Modes
Controller configuration
Command History
Usage Guidelines
If you do not specify the clock source command, the default internal clock source is used by the CT3IP.
You can also set the clock source for each T1 channel by using the t1 clock source controller configuration command.
Note
Examples
The following example sets the clock source for the CT3IP to line:
Router(config)# controller t3 9/0/0Router(config-if)# clock source lineRelated Commands
clock source (interface)
To control the clock from which a G.703-E1 interface, an E1-G.703/G.704 serial port adapter, or a PA-E3 serial port adapter clocks its transmitted data, use the clock source command in interface configuration mode. To restore the default clock source, use the no form of this command.
Cisco 4000, 7000, 7200, and 7500 Series
clock source {line | internal}
no clock source
Cisco AS5200 and AS5300 Access Servers
clock source {line {primary | secondary} | internal}
no clock source line {primary | secondary}
Syntax Description
Defaults
Cisco 4000, 7000, 7200, and 7500 Series
The clock source is the line's receive data stream.
Cisco AS5200 and AS5300 Access Servers
The primary TDM clock source is from the T0 controller.
The secondary TDM clock source is from the T1 controller.
Command Modes
Interface configuration
Command History
Usage Guidelines
Cisco 4000, 7000, 7200, and 7500 Series
A G.703-E1 interface, E1-G.703/G.704 serial port adapter, or a PA-E3 serial port adapter can clock its transmitted data from either its internal clock or from a clock recovered from the line's receive data stream.
Cisco AS5200 and AS5300 Access Servers
To use the clocking coming in from a T1 line, configure the clock source line primary command on the controller that has the most reliable clocking. Configure the clock source line secondary command on the controller that has the next best known clocking. With this configuration, the primary line clocking is backed up to the secondary line if the primary clocking shuts down.
Examples
Cisco 4000, 7000, 7200, and 7500 Series
The following example specifies the G.703-E1 interface to clock its transmitted data from its internal clock:
Router(config)# interface serial 0/1Router(config-if)# clock source internalCisco AS5200 and AS5300 Access Servers
The following example configures the Cisco AS5200 to use the T0 controller as the primary clocking source and the T1 controller as the secondary clocking source:
AS5200(config)# controller t1 0AS5200(config-if)# clock source line primaryAS5200(config-if)# exitAS5200(config)# controller t1 1AS5200(config-if)# clock source line secondaryclock source (MC3810)
To specify the clock source of a DS1 link on the Cisco MC3810 multiservice access concentrator, use the clock source command in controller configuration mode. To restore the clock source to its default setting, use the no form of this command.
clock source {line | internal | loop-timed}
no clock source
Syntax Description
Defaults
Line (when the MFT is installed)
Internal (when the DVM is installed)Command Modes
Controller configuration
Command History
Usage Guidelines
This command applies to Voice-over-Frame Relay, Voice-over-ATM, and Voice-over-HDLC on the Cisco MC3810.
Note
Examples
The following example configures the clock source for the MFT to internal, and the clock source for the DVM line on a Cisco MC3810 multiservice access concentrator:
Router(config)# controller T1 0Router(config-controller)# clock source internalRouter(config)# controller T1 1Router(config-controller)# clock source lineclock source (SONET controller)
To specify the clock source of a SONET controller, use the clock source command in controller configuration mode. To restore the clock source to its default setting, use the no form of this command.
clock source {internal | line | loop}
no clock source
Syntax Description
Defaults
Internal
Command Modes
Controller configuration
Command History
10.3
This command was introduced.
12.2(15)T
This command was integrated into Cisco IOS Release 12.2(15)T.
Examples
The following example shows how to specify line timing as the clock source on a SONET controller of an STM-1 card in physical slot number 2 on a Cisco AS5850:
Router(config)# controller sonet 2/0Router(config-controller)# clock source lineclock source (T1/E1 controller)
To set clocking for individual T1 or E1 links, use the clock source command in controller configuration mode. To return to the default, use the no form of this command.
clock source {line [primary] | internal | free-running}
no clock source
Syntax Description
Defaults
line.
Command Modes
Controller configuration
Command History
Usage Guidelines
For a detailed discussion of clock sources on individual ports, see "Clock Sources on Digital T1/E1 Voice Ports" in the "Configuring Voice Ports" chapter in the Cisco IOS Voice, Video, and Fax Configuration Guide, Release 12.2.
Examples
The following example shows the router providing clock source to two controllers:
controller E1 1/0framing crc4linecoding hdb3clock source internalds0-group timeslots 1-15 type e&m-wink-start!controller E1 1/1framing esflinecoding b8zsclock source internalds0-group timeslots 1-15 type e&m-wink-startThe following example shows the digital voice hardware receiving clocking for the PLL from E1 1/0 and using this clock as a reference to clock E1 1/1. If controller E1 1/0 fails, the PLL internally generates the clock reference to drive E1 1/1.
controller E1 1/0framing crc4linecoding hdb3clock source lineds0-group timeslots 1-15 type e&m-wink-start!controller E1 1/1framing crc4linecoding hdb3clock source internalds0-group timeslots 1-15 type e&m-wink-startRelated Commands
controller
Configures a T1 or E1 controller and enters controller configuration mode.
clock source (T3/E3 controller)
To specify where the clock source is obtained for use by a T3 or E3 controller, use the clock source command in controller configuration mode. To restore the default clock source, use the no form of this command.
clock source {internal | line}
no clock source
Syntax Description
internal
Specifies that the internal clock source is used. This is the default for T3.
line
Specifies that the network clock source is used. This is the default for E3.
Defaults
The internal clock source is used for T3 controllers. The line clock source is used for E3 controllers.
Command Modes
Controller configuration
Command History
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
Examples
The following example shows the clock source set to line:
Router(config)# controller t3 1/0Router(config-controller)# clock source lineRelated Commands
controller
Configures a T1 or E1 controller and enters controller configuration mode.
