beautypg.com

Indicators on the pri network interface module – Polycom ViewStation EX4000 User Manual

Page 37

background image

Chapter 2 - Technical Information

© Polycom, Inc.

27

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.

Non-Facility
Associated Signaling
(NFAS)

Not supported

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

Not supported

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
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)

Parameter

PRI T1

PRI E1