Nortel Networks Circuit Card 311 - Manual (Page 973)

Functional description 973
Figure 281
NTBK50 2.0 Mb PRI card with daughterboards
Functional description
NTBK50 provides the following features and components:
• recovery of the 2.048 kbps data by the CEPT receiver, at signal levels
which are attenuated by up to 10 dB
• control of CEPT line density using HDB3 which provides 64 kbps clear
channel
• performance monitoring of the receive carrier by means of Bipolar
Violations (BPV), Slips, CRC-4 (CRC), and Frame Bit Errors (FBER)
• monitoring of receive carrier alarms including AIS, LOS, and RAI
• transmission of remote alarm when instructed
• slip-buffering receive messages
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
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