Configuring T3 Interfaces to Send MDL Messages

You can configure a T3 interface to send MDL messages. MDL messages are supported only when the T3 framing is set for C-bit parity, the default setting.

To configure a T3 interface to send MDL messages:

1. Specify a SONET interface.

   host1(config)#controller sonet 8/0

2. (Optional) Configure the interface to operate in an MDL carrier environment.

   host1(config-controll)#path 12 ds3 1 mdl carrier

3. Specify the MDL messages.

   host1(config-controll)#path 12 ds3 1 mdl string eic "ERX 1410"

   host1(config-controll)#path 12 ds3 1 mdl string fic "FG786"

   host1(config-controll)#path 12 ds3 1 mdl string lic "Bldg 2"

   host1(config-controll)#path 12 ds3 1 mdl string pfi "Site 1"

   host1(config-controll)#path 12 ds3 1 mdl string port 0800

   host1(config-controll)#path 12 ds3 1 mdl string unit 080001

4. Enable transmissions of MDL messages.

   host1(config-controll)#path 12 ds3 1 mdl transmit path-id

   host1(config-controll)#path 12 ds3 1 mdl transmit idle-signal

   host1(config-controll)#path 12 ds3 1 mdl transmit test-signal

path ds3 mdl carrier

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

  host1(config-controll)#path 12 ds3 1 mdl carrier

• Use the no version to restore the default situation, in which the interface does not operate in the carrier environment.
• See path ds3 mdl carrier.

path ds3 mdl string

• Use to specify an MDL message.
• Example

  host1(config-controll)#path 12 ds3 1 mdl string port 0800

• Use the no version to restore the default value to the specified MDL message or to all MDL messages.
• See path ds3 mdl string.

path ds3 mdl transmit

• Use to enable transmission of MDL messages.
• 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 12 ds3 1 mdl transmit test-signal

• Use the no version to disable transmission of the specified type of MDL messages or all MDL messages.
• See path ds3 mdl transmit.

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