Configuration Tasks

To configure a channelized T3 interface:

  1. Configure a T3 controller.
  2. (Optional) Configure MDL settings.
  3. (Optional) Configure other settings for the interface.
  4. Configure T1 channels and subchannels.
  5. Configure HDLC channels.

Configuring a T3 Controller

To configure a T3 controller:

  1. Access Controller Configuration mode by specifying the T3 controller.
    host1(config)#controller t3 0/1
  2. Enable the T3 controller.

    T3 controllers are disabled by default.

    host1(config-controll)#no shutdown

controller t3

shutdown

Configuring MDL Messages

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

To configure a channelized T3 interface to send MDL messages:

  1. Specify a T3 interface.
    host1(config)#controller t3 8/0
  2. (Optional) Configure the interface to operate in an MDL carrier environment.
    host1(config-controll)#mdl carrier
  3. Specify the MDL messages.
    host1(config-controll)#mdl string eic "ERX1410" host1(config-controll)#mdl string fic "FG786" host1(config-controll)#mdl string lic "Bldg 10" host1(config-controll)#mdl string pfi "Site 25" host1(config-controll)#mdl string port 0800 host1(config-controll)#mdl string unit 080001
  4. Enable transmission of MDL messages.
    host1(config-controll)#mdl transmit path-id host1(config-controll)#mdl transmit idle-signal host1(config-controll)#mdl transmit test-signal

mdl carrier

mdl string

mdl transmit

Other Optional Tasks

The following configuration tasks are optional when you configure a T3 controller:

cablelength

clock source

description

framing

snmp trap ip link-status

Configuring T1 Channels

To configure T1 channels and subchannels:

  1. From Global Configuration mode, specify the T3 controller in slot 0, port 1.
    host1(config)#controller t3 0/1
  2. Assign a range of timeslots to a channel and subchannel.

    For example, assign the following range of timeslots: 1, 3–8, and 10 to channel 2, subchannel 1. Timeslots 2, 9, and 11–24 are available for other subchannels.

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

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:

host1(config-controll)#t1 2,4,6-15,20-25 clock source line

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

controller t3

t1 clock source

t1 description

t1 framing

t1 shutdown

t1 snmp trap link-status

t1 timeslots

Configuring FDL Messages

To configure T1 channels to send FDL messages:

  1. Specify a T3 interface.
    host1(config)#controller t3 8/0
  2. Specify the standard for transmission of FDL messages on both ends of the T1 connection.
    host1(config-controll)#t1 1 fdl ansi
  3. (Optional) Configure one or more T1 channels to operate in an FDL carrier environment.
    host1(config-controll)#t1 1 fdl carrier
  4. (ANSI signals) Specify the FDL messages.
    host1(config-controll)#t1 1 fdl string eic "ERX1410" host1(config-controll)#t1 1 fdl string fic "HY0019" host1(config-controll)#t1 1 fdl string lic "Bldg 10" host1(config-controll)#t1 1 fdl string unit 080001 host1(config-controll)#t1 1 fdl string pfi "Site 25" host1(config-controll)#t1 1 fdl string port 0800 host1(config-controll)#t1 1 fdl string generator "Test generator"
  5. Enable transmission of FDL messages.
    host1(config-controll)#t1 1 fdl transmit path-id
  6. (Optional) Specify that the router should generate yellow alarms for the T1 channels.
    host1(config-controll)#t1 1 yellow generate
  7. (Optional) Specify that the router should detect yellow alarms for the T1 channels.
    host1(config-controll)#t1 1 yellow detect

t1 fdl

t1 fdl carrier

t1 fdl string

t1 fdl transmit

t1 yellow detect

t1 yellow generate

Configuring an HDLC Channel

You must configure an HDLC channel for each group of fractional T1 lines and each full T1 line.

To configure an HDLC channel, specify a serial interface (for example, HDLC channel in slot 0, port 1, channel 1, subchannel 5).

host1(config)#interface serial 0/1:1/5

Optional Tasks

The following configuration tasks are optional when you configure an HDLC channel on a channelized T3 interface:

crc

idle-character

interface serial

invert data

load-interval

mru

mtu

serial description