Polycom EX Manual De Referencia

Chapter 2 - Technical Information

© Polycom, Inc.

27

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.

Non-Facility 
Associated Signaling 
(NFAS)

Not supported

Special services 
(Caller ID, call 
blocking, etc.)

Not supported

Table 2-17.  PRI Network Side Indicator Lamps  

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 
frame sync,

 

waiting for 

a timer to elapse

Receiving clock and 
frame sync; receiving 
Remote Alarm 
Indication (RAI) from 
the network with no 
Cyclic Redundancy 
Check (CRC) errors

Red and yellow 
LEDs on

Receiving clock sync; 
receiving AIS Alarm 
Indication Signal

 

(unframed all-ones)

Green LED on

Synchronized with the network and ready to use

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