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Output Modules
RS-422 Selective Rate Clock Module
258
TSG-3800 User’s Guide
12778474-002-2 Revision F – March 2004
The initial state of the module indicators is shown in
Table 7-38
.
Verify that the POWER indicator is lit. This indicates that the module is receiving
power and the module power supply is working.
Verify that the module is receiving the input signals by observing the A and B INPUT
FAULT indicators. For Locked operation and with two references applied, both
indicators should be off.
If at least one functional Frame Generator is installed, the PORT FAULT indicators
should be off within eight seconds after the module is installed. If a port fault
indicator is on, an output may be bad or it may have an excessive load connected to
it: a short, for example. The indicator remains on if there is no reference connected
since there can be no outputs.
At initial power-up, all ten channels initialize in the off state: the output frequency is
0000 kHz, indicating the output port is off.
Table 7-38. RS-422 Selective Rate Clock Initial Indicator State
Indicator
State
POWER
GREEN
UNIT FAULT
OFF
INPUT FAULT
OFF
PORT FAULT
OFF
PORT SEL
1
OUTPUT FREQUENCY
0000
Note:
The INPUT FAULT LEDs indicate an alarm until the input clock
is qualified to be one of three acceptable input frequencies, 8 kHz,
1.544 MHz or 2.048 MHz, and the clock is stable.
Note:
The module indicators may take a few seconds after
installation to reach proper operating status.
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