Nortel Networks Video Gaming Accessories 553-3001-211 Manual De Usuario

 NTBK50 2.0 Mb PRI card

The NTBK50 obtains its power from the backplane, drawing up to 2 A on +5 
V, 35 mA on +15 V and 20 mA on –15 V.

The NTBK50 meets all applicable Nortel Networks operating specifications.

NTBK50 provides the following features and components:

•

recovery of the 2.048 kbps data by the CEPT receiver, at signal levels 
which have been 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)

Flashing 
(Green)

NTAK20 is equipped and is attempting to lock (tracking 
mode) to a reference. If the LED flashes continuously 
over an extended period of time, check the CC STAT in 
LD 60. If the CC is tracking this can be an acceptable 
state. Check for slips and related clock controller error 
conditions. If none exist, then this state is acceptable, 
and the flashing is identifying jitter on the reference.

Off

The clock controller is not equipped. 

On (Red)

DCH is disabled.

On (Green)

DCH is enabled, but not necessarily established. 

Off

DCH is not equipped.