Nortel Networks Circuit Card 311 User Manual

Page 843

Introduction

843

Noise Rejection:

Error Rate in White Noise

Better than: < 1/2500 calls
Test:
10 digit calls
nominal frequency @ -23 dBmO
ON/OFF = 50 ms/50ms
KP duration 100 ms
SNR = -20 dB
all digits

Immunity to Impulse Noise

Better than: < 1/2500 calls
Test:
10 digit calls
nominal frequency @ -23 dBmO
ON/OFF = 50ms/50ms
KP duration 100 ms
SNR = -12 dBs
all digits
ATT Digit Simulation Test, Tape #201 from PUB
56201

Error Rate from Power Lines

Better than: < 1/2500 calls
Test:
10 digit calls
nominal frequency @ -23 dBmO
ON/OFF = 50 ms/50ms
KP duration 100 ms
60 Hz signal @ 81 dBrnc0 (-9dBm)
or
180 Hz signal @ 68 dBrnco (-22dBm)
all digits

Tolerate Intermodulation:

Must tolerate @A-B and @B-A modulation products with
a power sum
28 dB below each frequency component level of the
signals.

KP:

KP activation

The receiver must not respond to signals prior to KP.
Remain unlocked until ST, STP, ST2P or ST3P is received.

Multiple KP’s

After the initial KP, subsequent KP’s are ignored while in
unlocked mode.

Excessive Components:

If more than two valid frequencies are detected, no digit is
reported to the CPU.

The XMFR receiver specifications conform to the following:

•

TR-NPL-000258, Compatibility Information for F.G.D. switched access
service, Bell Communication Research Technical Reference, Issue 1.0,
October 1985.

•

TR-NPL-000275, Notes on the BOC Intra-LATA Networks, Bell
Communication Research Technical Reference, Chapter 6, 1986.

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311

01.04

Standard

Release 5.0

23 May 2008