Chapter 2 - Technical Information

Table 2-16. PRI T1 and E1 Network Interface Modules (Continued)

Parameter

PRI T1

PRI E1

 

 

 

Non-Facility

Not supported

 

Associated Signaling

 

 

(NFAS)

 

 

 

 

 

Special services

Not supported

 

(Caller ID, call

 

 

blocking, etc.)

 

 

 

 

 

Indicators on the PRI Network Interface Module

The tables below describe the expected behavior of the indicator lamps on the PRI network interface module. On the network side, the expected behavior depends on whether it is a T1 module or an E1 module.

Table 2-17. PRI Network Side Indicator Lamps

Indication

PRI T1

PRI E1

 

 

 

Red LED blinking

Not connected to the network, or no power to the

 

upstream equipment

 

 

 

Red LED on

Connected to the network, but no clock sync

 

 

 

Yellow LED blinking

 

Receiving clock and

 

 

frame sync; receiving

 

 

RAI from the network

 

 

with CRC errors

 

 

 

Yellow LED on

Receiving clock and

Receiving clock and

 

frame sync, waiting for

frame sync; receiving

 

a timer to elapse

Remote Alarm

 

 

Indication (RAI) from

 

 

the network with no

 

 

Cyclic Redundancy

 

 

Check (CRC) errors

 

 

 

Red and yellow

 

Receiving clock sync;

LEDs on

 

receiving AIS Alarm

 

 

Indication Signal

 

 

(unframed all-ones)

 

 

 

Green LED on

Synchronized with the network and ready to use

 

 

 

© Polycom, Inc.

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Polycom EX, FX, VS4000, EX4000, FX4000, VS4000 manual Indicators on the PRI Network Interface Module, Nfas, Indication

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