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CXR Larus 80-100-400 Issue 2 July 2006 page
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k. Serial Clock to transceivers to both input cards.
l. Transceiver Select lines to both input cards.
3.3447 LED
Indicators:
Front Panel Label
LED Color
Indication
FAIL Red Card
fail
INPUT A
Green
Input A select, tracking
INPUT B
Green
Input B select, tracking
HOLD Yellow Hold
ACQUIRE Green
Acquiring
data
LOCKED Green
Locked
FREERUN Yellow
Free
run
ACTIVE Green Driving
outputs
3.3448 Controls and Monitoring:
a. Test pushbutton (press for up to 1 second). In the tracking state,
momentary hold test; display shows 'H' if successful. Does not disrupt
tracking. In invalid output state, resets tracking algorithm to FREERUN
state; display shows 'r'. (An internal TEST/RUN toggle, S2, is set in RUN
mode for normal operation.)
b. Monitor jack (-20 dB), framed all ones at clock output frequency.
c. Software control for selecting SF/ESF or CCS/CAS framing format for
each input.
d. EEPROM for storing last best direct digital frequency synthesizer (DDFS)
guess.
e. Flash EPROM for updating software.
f. Temperature sensor for future software algorithms for temperature
compensated holdover.
3.3449 Seven Segment Status Display:
a. Status conditions while in tracking or acquisition state (display blinks every
1 to 2 seconds):
.
ACQUIRE 1 state (single dot).
o
At top of display: Normal tracking, no phase error. Alternates with
display of input reference.
o
At bottom of display: Correction in progress due to more than 1/4
bit phase change.
P
Displayed momentarily immediately after power-up if input card is
T1 type (54511) or CC/5 Mhz/10 MHz (54513).
E
Displayed momentarily immediately after power-up if input card is
