CXR 54500-16, Руководство пользователя

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CXR Larus 80-100-400 Issue 2 July 2006 page
3-17
<5 x 10
-9
over any ±10
°
C temperature range change within 24 hours
3.3442 Traceability:
<1 x 10
-11
3.3443 Warmup
Time:
Approximately 5 minutes from cold start
NOTE:
The output driver cards (Models 54571 through 54577) will not deliver an output whose
frequency is within specification until the track and hold card has completed its warmup
cycle following plug-in or power turn-on.
3.3444 Acquisition Time:
a. From power-up after warmup time:
100 seconds (ACQUIRE 1 state), followed by 300 seconds (ACQUIRE 2
state). Thus, initial entry into normal tracking mode is 12 minutes from
cold start (5 minutes plus 400 seconds).
b. From HOLD state returning to normal tracking:
300 seconds (ACQUIRE 2 state).
3.3445 Settling time:
3000 seconds in normal tracking state
3.3446 Output Signals:
a. Ovenized crystal oscillator, derived from nominal clock frequency of 1.544
MHz, tracks input reference or holding; differential backplane signal drives
up to ten output cards and one or two 54541 T1 or 54542 E1/2.048 MHz
Synchronization Monitor Cards.
b. Clock monitor, framed all ones.
c. Hold indication bus to output cards.
d. Combined software/hardware alarm indication to 54560 Alarm Interface
Card.
e. Hardware alarm indication to 54550 Information Management Card.
f. Serial data link to 54550 Information Management Card for status, control,
personality, and DS1 sync messaging.
g. One-wire interface used by the 54550 to determine whether or not the
54522 is installed.
h. Sync Status Messaging data and clock lines (DS1 only) to output cards.
i. Input select line to 54511/54512/54513 input cards.
j. Serial Data output to transceivers to both input cards.