Configuring T1 Interfaces to Send FDL Messages

You can configure a T1 interface to send FDL messages. To configure FDL:

1. Specify a SONET interface.

   host1(config)#controller sonet 8/0

2. Specify the standard for transmission of FDL messages on both ends of the T1 connection.

   host1(config-controll)#path 2 ds1 1/1/1 fdl ansi

3. (Optional) Configure the interface to operate in an FDL carrier environment.

   host1(config-controll)#path 2 ds1 1/1/1 fdl carrier

4. (Optional) Specify the FDL messages.

   host1(config-controll)#path 2 ds1 1/1/1 fdl string eic "ERX-1410"

   host1(config-controll)#path 2 ds1 1/1/1 fdl string lic "Bldg 10"

   host1(config-controll)#path 2 ds1 1/1/1 fdl string fic "GY788"

   host1(config-controll)#path 2 ds1 1/1/1 fdl string unit 080001

5. Enable transmission of FDL messages.

   host1(config-controll)#path 2 ds1 1/1/1 fdl transmit idle-signal

path ds1 fdl

• Use to specify the FDL standard for the interface.
• Specify the keyword ansi to support the ANSI FDL standard (see References).
• Specify the keyword att to support the AT&T FDL standard (see References).
• Specify the keyword all to support both the ANSI and AT&T standards.
• Specify the keyword none to remove the current FDL mode settings.
• You can configure a different standard on each T1 channel.
• Example

  host1(config-controll)#path 2 ds1 1/1/1 fdl att

• Use the no version to restore the default, none.
• See path ds1 fdl.

path ds1 fdl carrier

• Use to specify that an interface is used in the carrier environment.
• Example

  host1(config-controll)#path 2 ds1 1/1/1 fdl carrier

• Use the no version to restore the default situation, in which the T1 interface does not operate in the carrier environment.
• See path ds1 fdl carrier.

path ds1 fdl string

• Use to configure an FDL message as defined in the ANSI T1.403 specification.

  Note: The router sends these FDL messages only if you have issued the path ds1 fdl command with the ansi or all keyword and then issued the path ds1 fdl transmit command.

• Example

  host1(config-controll)#path 2 ds1 1/1/1 fdl string eic "ERX-1440"

• Use the no version to restore the default value to the specified FDL message or to all FDL messages.
• See path ds1 fdl string.

path ds1 fdl transmit

• Use to configure the router to send the specified type of FDL message on the T1 channel.
• By default, the router sends no FDL messages.

  Note: The router sends FDL messages specified with the path ds1 fdl string command only if you have issued the path ds1 fdl command with the ansi or all keyword. If you specified the att keyword with the path ds1 fdl command, the router sends only performance data.

• Specify the keyword path-id to transmit path identifications every second.
• Specify the keyword idle-signal to send idle signals every second.
• Specify the keyword test-signal to transmit test signals every second.
• Example

  host1(config-controll)#path 2 ds1 1/1/1 fdl transmit path-id

• Use the no version to disable transmission of the specified FDL message or all FDL messages.
• See path ds1 fdl transmit.

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