Configuring T1 and E1 Lines

You can configure T1 and E1 interfaces on paths and tributaries. To do so, complete the following steps:

1. Configure the clock source. You must coordinate this setting with the other end of the line to establish which end is the transmit (internal) clock and which is the receive (line) clock.
2. (Optional) Configure the framing format.
3. (Optional) Enable processing of SNMP link status information about an interface and its associated tributary.
4. Configure the T1 or E1 line parameters.
5. (Optional) Enable processing of SNMP link status information about a channel group.
6. (Optional—T1 only) Configure FDL messages.
7. (Optional) Assign a text description or an alias to the interface.

path ds1|e1 channel-group description

• Use to assign a text description or an alias to a DS1 (T1) or an E1 channel group for channelized SONET and SDH interfaces.
• 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 sonet ds1|e1 to display the text description.
• Example

  host1(config-controller)#path 10 e1 1/5/1 channel-group 4
  description westford e1 151.4

• Use the no version to remove the text description or alias.
• See path ds1|e1 channel-group description.

path ds1|e1 channel-group shutdown

• Use to disable a T1 or an E1 channel group.
• T1 and E1 channel groups are enabled by default.
• Example

  host1 (config-controll)#path 12 e1 1/4/1 channel-group 2 shutdown

• Use the no version to restart a disabled channel group.
• See path ds1|e1 channel-group shutdown.

path ds1|e1 channel-group snmp trap link-status

• Use to enable SNMP link status processing for a T1 or an E1 channel group.
• The default is disabled.
• Example

  host1(config-controll)#path 2 ds1 1/1/1 channel-group 2 snmp trap link-status

• Use the no version to disable SNMP link status processing for a T1 or an E1 channel group.
• See path ds1|e1 channel-group snmp trap link-status.

path ds1|e1 channel-group timeslots

• Use to configure T1 or E1 line parameters.
• You cannot configure a mixture of T1 and E1 lines on the same cOCx/STMx line module.
• Specify a T1 or E1 channel group number, and assign a range of timeslots.
• To configure a whole T1 or E1 line, assign all the timeslots to the channel group.
• You can specify a line speed that applies to all DS0 timeslots assigned to a channel group.
• Example

  host1(config-controll)#path 2 ds1 1/1/1 channel-group 2 timeslots 5-6

• Use the no version to remove the timeslots from the channel group.
• See path ds1|e1 channel-group timeslots.

path ds1|e1 clock source

• Use to configure the transmit clock source for the T1 or E1 interface.
• Select a clock as follows:
  • Specify the keyword line to use a transmit clock recovered from the line’s receive data stream.
  • Specify the keywords internal module to use the line module’s internal clock.
  • Specify the keywords internal chassis to use the router’s clock.
• You can usually accept the default option, line, to use a transmit clock recovered from the line’s receive data stream, except in rare cases such as back-to-back router tests. When performing back-to-back router tests, configure one end of the line as internal and the other end as line.
• On a cOC3/STM1 I/O module, you can configure some interfaces with internal clock sources and others with line clock sources. However, all interfaces with internal clock sources must use either the router’s clock or the module’s clock. You cannot configure some interfaces on the I/O module to use the router’s clock and others to use the module’s clock.
• To change the clock source of the interfaces on a cOC3/STM1 I/O module from the router’s clock to the module’s clock or vice versa, first change the clock source of all ports to the line setting, and then to the new internal clock setting.
• Example

  host1(config-controll)#path 12 e1 1/4/1 clock source line

• Use the no version to restore the default value, line.
• See path ds1|e1 clock source.

path ds1|e1 framing

• Use to configure the framing format for a T1 or an E1 interface.
• For T1, specify esf (extended superframe) or sf (superframe). The default is esf.
• The HDLC idle character differs from non–E-series implementations. For T1 interfaces, if you configure SF, the router sets the HDLC idle character to 0xFF. If you configure ESF, the router sets the HDLC idle character to 0x7E.
• For E1, specify crc4 or no-crc4. The default is crc4.
• Choose a framing format that is compatible with the framing format at the other end of the line.
• Example

  host1(config-controll)#path 12 e1 1/4/1 framing no-crc4

• Use the no version to restore the default value.
• See path ds1|e1 framing.

path ds1|e1 snmp trap link-status

• Use to enable SNMP link status processing for a T1 or an E1 interface and its associated tributary.
• The default is disabled.
• Example

  host1(config-controll)#path 2 ds1 1/1/1 snmp trap link-status

• Use the no version to disable SNMP link status processing.
• See path ds1|e1 snmp trap link-status.

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