Self Tests-CONT.

TM 11-5895-1179-13 EE132-EA-OMP-010/E106 KY883 TO 31S1-2GSC-161

(8)

If you see a display on the ERROR RATE COUNTER other than the display shown in table 2-7, notify the

next higher level of maintenance.

(9) You can check as many of the front panel assembly switches as you want during this part of the off-line self-

test. However, you must change switch positions at least once every five seconds, or this portion of the test

will end. Changing the ON LINE/SELF TEST switch to the LAMP TEST position (down) causes the off-line

self-test to start over from the beginning.

(10) If you do not want to check the front panel assembly switches, do nothing. The off-line self-test will continue

indefinitely.

(11) If the off-line self-test finishes without finding a problem, the ERROR RATE COUNTER will show GO for five

seconds and the off-line self-test will start again from the beginning. The off-line self-test will run continuously

until a problem is found or until you change the position of the FUNCTION select switch.

Tamp Test.

The lamp test checks all the indicators on the front panel assembly. To run the lamp test, put the

FUNCTION select switch in the ON LINE position and the ON/OFF switch in the ON position. Put the ON LINE/SELF

TEST switch in the down position and hold it there. All the indicators on the front panel assembly should come on while

the ON LINE/SELF TEST switch is held down. If an indicator does not come on notify the next higher level of maintenance.

The ON LINE/SELF TEST switch will return to the center position when you release it. The lamp test can be run without

interrupting the communications link.

Link Test. The link test checks the quality of the communications link from end to end by sending a known

internally generated data sequence from the transmit end of the communications link to the receive end of the

communications link. The data sequence received at the receive end of the communications link is compared bit for bit

with the known data sequence that was transmitted. Detected channel or output errors are shown on the ERROR RATE

COUNTER. To run the link test, do the following steps in order:

(1) Set the FUNCTION select switch to the LINK TEST position.

(2) Toggle upward and release the error rate DISPLAY SELECT switch to turn on the error rate select indicator

that corresponds to the errog rate you want to measure, CHANNEL (X10- ) or OUTPUT (X10- ). The error

rate DISPLAY SELECT switch will return to the center position when you release it.

(3) The coded error rate is shown on the ERROR RATE COUNTER. When measuring the channel error rate,

multiply the value shown on the ERROR RATE COUNTER by 0.001 (10- ). When measuring the output error

rate, multiply the value shown on the ERROR RATE COUNTER by 0.00001 (10- ). The result of this

multiplication is the error rate. If the ERROR RATE COUNTER shows 999, when measuring output errors,

the equipment is defective and the next higher level of

2-17