Optional Tasks

The T1 channel configuration commands enable you to specify options for a single channel, multiple individual channels, ranges of channels, or any combination of the three types of specifications. For example:

The following configuration tasks are optional when you configure T1 channels:

• Disable T1 channels.
• Change the clock source.
• Assign a text description or an alias to the interface.
• Change the framing format.
• Enable or disable SNMP link status processing.
• Configure FDL messages.

controller t3

• Use to specify a T3 controller in slot/port format.
  • slot—Number of the slot in which the line module resides in the chassis
  • port—Number of the port on the I/O module
• Example

  host1(config)#controller t3 0/1

• There is no no version.
• See controller t3.

t1 clock source

• Use to configure the transmit clock source for T1 channels.
• The router supports internal and line clocking.
  • If you specify internal clocking, the interface transmits data using the line module or the chassis as the internal clock. You must specify one of the following for internal clocking:
    • module—Specifies internal clock is from the line module itself
    • chassis—Specifies internal clock is from the configured router clock
  • If you specify line clocking, the interface transmits data with a clock recovered from the line’s receive data stream.
• Example

  host1(config-controll)#t1 2,4-10 clock source line

• Use the no version to restore the default value, line.
• See t1 clock source.

t1 description

• Use to assign a text description or an alias to T1 or fractional T1 channels on a CT3 module.
• You can use this command to help you identify the interface and keep track of interface connections.
• The description or alias can be a maximum of 80 characters.
• Use show controllers t3 to display the text description.
• Examples

  host1(config-controll)#t1 2 description london t1 interface

  host1(config-controll)#t1 2/1 description london first ft1 interface

• Use the no version to remove the text description or alias.
• See t1 description.

t1 framing

• Use to configure the framing format for T1 channels.
• You must specify either esf (extended superframe) or sf (superframe) framing.
• The framing format you choose must be compatible with the framing format at the other end of the line.
• Example

  host1(config-controll)#t1 2 framing sf

• Use the no version to restore the default value, esf.
• See t1 framing.

t1 shutdown

• Use to disable T1 channels or a subchannel.
• To disable channels or a subchannel, specify one or more T1 channels or a subchannel in channel or channel/subchannel format.
  • channel—One or more T1 channels, or a range of channels in the range 1–28
  • subchannel—Subchannel from 1–24
• The T1 interface is enabled by default.
• Example

  host1(config-controll)#t1 4-15,18,21,25-27 shutdown

• Use the no version to restart a disabled interface.
• See t1 shutdown.

t1 snmp trap link-status

• Use to enable SNMP link status processing on T1 channels.
• To enable or disable SNMP on an interface, specify T1 channels or subchannel in channel or channel/subchannel format.
  • channel—One or more T1 channels, or a range of channels in the range 1–28
  • subchannel—Subchannel from 1–24
• Example

  host1(config-controll)#t1 2 snmp trap link-status

• Use the no version to disable SNMP link status processing.
• See t1 snmp trap link-status.

t1 timeslots

• Use to assign a range of DS0 timeslots to a subchannel as a single data stream.
• To configure a subchannel, specify a T1 channel in channel/subchannel format and a range of timeslots.
  • channel—T1 channel in the range 1–28
  • subchannel—Number from 1–24
  • dash—Represents a range of timeslots; a comma separates timeslots. For example, 1-10, 15-18 assigns timeslots 1–10 and 15–18.
• Example

  host1(config-controll)#t1 2/1 timeslots 1,3-8,10

• You can specify a line speed that applies to all DS0 timeslots assigned to a subchannel. The default line speed is 64 Kbps.
• Use the no version to delete the fractional T1 circuit.
• See t1 timeslots.

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