___________________________________________________
CXR Larus 80-100-400 Issue 2 July 2006 page
3-5
3.318
Input impedance when used in conjunction with the backplane:
a. Input a
100 ohms ±5%
b. Input b
964 ohms ±5%
c. Input c
100 ohms ±5%
Input impedance of the card at the bridging input terminals in the shelf with the
termination resistors removed is >3.3K ohms.
3.319
Connector (on backplane):
Three pairs of wirewrap terminals for 22 AWG shielded pair cable
3.3110 Jitter
Tolerance:
Per Bellcore TR-NWT-000499 and ITU-T G.824
3.3111 Output
Signals:
a. Receive clock (1.544 MHz) from either DS1 input, selected by the
corresponding track and hold card; outputs on the backplane to both track
and hold cards.
b. Differential recovered input clock signal to output driver cards (used only if
both track and hold cards fail).
c. Alarm signal to 54560 Alarm Interface Card.
d. One-wire interface to 54550 Information Management Card to report
personality (Model, List, Issue, revisions, Larus serial number, customer
inventory control information, and other customer designated data),
framing, light-emitting diode (LED) status, and slot ID.
e. Front panel monitor jack (-20 dB) for recovered signal.
f. Serial Data Output to both track and hold cards from the transceiver.
3.3112 LED
Indicators:
Front Panel Label
LED Color
Indication
FAIL Red Card
Fail
I/P A
Green
Input A selected
I/P B
Green
Input B selected
PULSES
Green
Input pulses present
I/P FAULT
Yellow
Input fault [excess bipolar
violations (BPVs)]
LOS
Red
Input fault [excess bipolar
violations (BPVs)]
3.3114 Card
Power:
-48 volts, 40 mA (nominal)
