Руководство Пользователя для Nortel 4000

Managing Remote Access Concentrators Using Annex Manager

Chapter 3    Determining RAC Status

3-18

The

PRI CSU Status

box displays statistics for the T1 network interface.

This box includes the following categories:

•

Sync

 indicates whether the T1 engine is detecting frame

synchronization. This field displays

True

 if the T1 engine is

detecting frame synchronization or

False

if the T1 engine lost

frame synchronization and entered the red alarm state.

•

Signal Loss

 indicates whether the CSU is detecting pulses on the

T1 network interface receivers. If the engine is not detecting
pulses, the T1 line transmits AIS (all ones, unframed) on the T1
network interface. This field displays

True

 when the engine is

not detecting pulses and

False

 when it is detecting pulses.

•

Loopback Mode

 indicates loopback status. This field can display:

–

NoLoop

 to show that the signal is not looped through the T1

engine.

–

LocalLoop

 to indicate that the outgoing signal of the T1

engine is looped back to the incoming side.

–

LineLoop

 to show that the incoming signal is looped to the

network without passing through the T1 engine.

–

PayloadLoop

 to show that the incoming signal is looped

through the T1 engine after it passes through the framing
function.

•

Unit ID

 identifies the T1 engine, using its firmware number,

firmware revision number, firmware release date, and EPROM
check sum.