Configuring T3 Line Parameters

Complete the following steps to configure T3 line parameters. Configure these parameters for both clear channel and multiplexed T3 lines.

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) Assign a text description or an alias to the interface.
3. (Optional) Configure the framing format.
4. (Optional) Enable processing of SNMP link status information about an interface.
5. (Optional) Configure MDL settings.
6. (Optional) Configure T1 channels.

path ds3 clock source

• Use to configure the transmit clock source for the T3 line.
• 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 ds3 1 clock source line

• Use the no version to restore the default value, line.
• See path ds3 clock source.

path ds3 description

• Use to assign a text description or an alias to a T3 (DS3) over channelized SONET/SDH interface.
• 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 ds3 to display the text description.
• Example

  host1(config-controller)#path 12 ds3 1 description boston_t3

• Use the no version to remove the text description or alias.
• See path ds3 description.

path ds3 framing

• Use to configure the framing format for a T3 interface.
• Specify c-bit parity framing or m23 multiplexer framing.
• Example

  host1(config-controll)#path 12 ds3 1 framing m23

• Use the no version to restore the default value, c-bit parity framing.
• See path ds3 framing.

path ds3 shutdown

• Use to disable a T3 interface.
• T3 interfaces are enabled by default.
• Example

  host1(config-controll)#path 12 ds3 1 shutdown

• Use the no version to restart a disabled interface.
• See path ds3 shutdown.

path ds3 snmp trap link-status

• Use to enable SNMP link status processing for a T3 interface.
• The default disables SNMP link status processing.
• Example

  host1(config-controll)#path 12 ds3 1 snmp trap link-status

• Use the no version to disable SNMP link status processing.
• See path ds3 snmp trap link-status.

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