Nortel 4000 用户指南

Managing Remote Access Concentrators Using Annex Manager

Chapter 3    Determining RAC Status

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The

T1 Status

box displays statistics for the T1 network interface. This

box includes the following categories:

•

Engine Bypass

indicates whether the engine is connected to the

network interface. This field displays

enabled

 if the T1 engine is

connected to the network interface or

disabled

if the T1 engine

is connected to the Drop/Insert Interface.

•

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.

•

DII Sync

 indicates whether the Drop/Insert Interface is receiving

ones pulses and is in frame synchronization. This field displays

True

 if the Drop/Insert Interface is receiving ones pulses and is

in frame synchronization or

False

 if the Drop/Insert Interface is

out of frame synchronization or not receiving pulses and is
sending AIS (all ones unframed).

•

Signal Loss

 indicates whether the T1 engine is detecting pulses

on the T1 network interface receivers. This field displays

True

 if

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

False

 if the T1 network

interface is receiving 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 show 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.