Example: Configuring a Channelized T1 Interface as a Clear Channel

No special configuration beyond device initialization is required before configuring this feature.

In this example, you configure the ct1-3/0/0 interface as a clear channel. As part of the configuration, you configure the following interface options:

• Use the device’s system clock (internal) instead of a signal received from the T1 interface (external) as the transmit clock source.
• Label the physical interface (description) as clear t1 interface.
• Delay the advertisement of interface transitions (hold-time) from up to down to 500 milliseconds. Additionally, set the link hold up time to 500 milliseconds.
• Use the interface as a single clear channel (no-partition).
• Use subunit queuing on Frame Relay or VLAN IQ interfaces (per-unit-scheduler).

You also set E1 options:

• Set the bit error rate (BERT) algorithm to all ones repeating.
• Set the BERT error rate to 5.
• Set the BERT period to 5 seconds.
• Set the line buildout, for cables to 0-132 feet.
• Set the framing mode to ESF.
• Set the line encoding method to alternate mark inversion (AMI).
• Set the loopback mode to local.

Additionally, this example shows how to flag all traceoption messages and how to apply configuration settings to the test group.

To configure a channelized T1 interface as a clear channel:

1. Create the new interface.

   [edit]user@host# edit interfaces ct1-3/0/0

2. Configure interface options.

   [edit interfaces ct1-3/0/0]user@host# set clock internaluser@host# set description clear t1 interfaceuser@host# set hold-time down 500 up 500user@host# set no-partition interface-type t1user@host# set per-unit-scheduler

3. Configure T1 options.

   [edit interfaces ct1-3/0/0]user@host# set bert-algorithm all-ones-repeatinguser@host# set bert-error-rate 5user@host# set bert-period 5user@host# set buildout 0–132user@host# set framing esfuser@host# set line encoding amiuser@host# set loopback local

4. Configure trace options.

   [edit interfaces ct1-3/0/0]user@host# set traceoptions flag all

5. Configure advanced options.

   [edit interfaces ct1-3/0/0]user@host# set interfaces apply-groups test