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2-8 WAN Module Installation and User Guide

Configuring the WAN Physical Link

Monitoring WAN Physical Links

T1, E1, and T3 devices have a built-in facility designed for troubleshooting the physical

link, called loopback. The link can also be monitored using show commands to display

the current configuration of the link, any alarms on the link, link statistics, and link

errors.

Loopback

The WAN device can be set up to loopback, that is, return a transmitted signal back to

the sender so it can be compared with the original. There are several different types of

loopback available to test different parts of the device and the line, as specified in the

T1, E1, and T3 standards.

Figure 2-1: Normal operation of WAN link

During normal operation of a link, as the local data stream enters the framer, the

appropriate framing bits are inserted into the data, and the framed signal is transmitted

config ports <portlist> e1 timeslots <timeslots> Sets the timeslots for data used on the E1 link.

Timeslots range from 1 to 31.

config ports <portlist> t1 yellow [detection |

generation | both | off]

Enable and disable yellow alarm detection and

generation for T1 ports.

Table 2-1: WAN Port Configuration Commands (continued)

Command Description

XM_010

Local WAN Port Remote WAN Port

Framer

Data in

Data out

Data in

Framer

Data with framing

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 45 46

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