7700 MultiFrame Manual
7707IT Multi-Channel Intercom Fiber Transceiver
Page - 14
Revision 1.7
4.
CARD-EDGE MONITORING AND CONTROL
The 7707IT has one LED status indicator per channel and a 4-digit dot-matrix display on the front card-
edge to show operational status of the card at a glance. The card-edge pushbutton and toggle switch are
used to select various indications to the dot-matrix display and LED’s. Figure 4-1 shows the locations of
the indicators and pushbutton.
FRAME STATUS
ON/OFF
/ MODULE OK
LOCAL FAULT
CH:01
SERIAL
RUN/UPGRADE
SERIAL
CH:02
CH:03
CH:04
CH:05
CH:06
CH:07
CH:08
7707IT-8
Only
CARD ID
A/ B
Figure 4-1: Location of Status Indicators and Jumpers
4.1.
STATUS INDICATOR LEDS
LOCAL FAULT:
This red LED indicates poor module health. Three conditions could cause this fault
indication to be active: A link with a companion 7707IT has not been achieved,
operation of the output laser is erroneous, or if a card power fault exists (i.e. a
blown fuse). If a link is not maintained between two companion 7707IT cards, refer
to section 6.1, and verify the selection of the CARD ID jumper. The LOCAL FAULT
indication can also be reported to the frame by setting the FRAME STATUS jumper.
MODULE OK:
This green LED indicates good module health. It will be on while a link is maintained
with a companion 7707IT, the output laser is operating properly, and the card power
is good.
CH:01
to
CH:08:
These green LED’s indicate the signal status of the respective intercom channels.
Selectable modes accommodate discrete signal presence indication of input audio,
output audio, input data, or output data. Presence of audio, data, input, and output
signals may also be combined to the LED of the respective channel. Selectable
modes of signal status indication are described in section 4.2 of this manual.
