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Table 10: Loopback Modes by Interface Type (continued)

Usage GuidelinesLoopback ModesInterface

Configuring T1 Loopback Capability and

Configuring T3 Loopback Capability

See also Configuring the T1 Remote Loopback

Response

Local, payload, and

remote

T1 and T3

To configure loopback testing, include the loopback statement:

loopback mode;

You can include this statement at the following hierarchy levels:

•

[edit interfaces interface-name aggregated-ether-options]

•

[edit interfaces interface-name ds0-options]

•

[edit interfaces interface-name e1-options]

•

[edit interfaces interface-name e3-options]

•

[edit interfaces interface-name fastether-options]

•

[edit interfaces interface-name gigether-options]

•

[edit interfaces interface-name serial-options]

•

[edit interfaces interface-name sonet-options]

•

[edit interfaces interface-name t1-options]

•

[edit interfaces interface-name t3-options]

Interface Diagnostics

BERT allows you to troubleshoot problems by checking the quality of links. You can

configure any of the following interfaces to execute a BERT when the interface receives

a request to run this test: E1, E3, T1, T3; the channelized DS3, OC3, OC12, and STM1

interfaces; and the channelized DS3 IQ, E1 IQ, and OC12 IQ interfaces.

A BERT test requires a line loop to be in place on either the transmission devices or the

far-end router. The local router generates a known bit pattern and sends it out the transmit

path. The received pattern is then verified against the sent pattern. The higher the bit

error rate of the received pattern, the worse the noise is on the physical circuit. As you

move the position of the line loop increasingly downstream toward the far-end router,

you can isolate the troubled portion of the link.

To configure BERT, you must configure the duration of the test, the bit pattern to send

on the transmit path, and the error rate to monitor when the inbound pattern is received.

To configure the duration of the test, the pattern to send in the bit stream, and the error

rate to include in the bit stream, include the bert-period, bert-algorithm, and bert-error-rate

statements, respectively, at the [edit interfaces interface-name interface-type-options]

hierarchy level:

Chapter 8: Interface Diagnostics

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