BIT COUNT INTEGRITY TEST-CONT.

T.O. 31W2-2GSC24-2

TM 11-5805-688-14-1

NAVELEX 0967-LP-545-3010

8. Set data test set output rate to within +5

If the digital channel being tested is

parts per million (ppm) of the channel's designated input

configured with a TE/TR card, the timing

rate (Rc).

cable

not

required.

Cable

requirements are identified in figure 6-

9. Initiate pseudorandom data pattern and

10.

observe that no data bit errors are detected during a

period of approximately 1 minute.

The

Harris

Model

7003

Digital

Communications Test Set or any other

10. Set data test set to inject one or more

equivalent data test set that is available

errors in its output data pattern and observe that a

may be used for digital channel BCI

corresponding number of errors is measured at the data

testing. The selected data test set must

test set input.

satisfy the multiplexer input/output

interface requirements specified in table

Set data test set for an error-free output.

1-3,

provide

pseudorandom

data

patterns of 23-1 or greater bits in length,

12. If the channel under test is being processed

and be capable of injecting and

using a multiplexer RCB channel card, set data test set

detecting data bit errors. Proper test set

output rate to a value approximately 2500 ppm greater

operation without a timing input

than the channel's designated input rate (Ro). If a TE/TR

accompanying the digital data stream

card is used, proceed to step 15.

being monitored is also required.

13. Observe that front panel MULTIPLEXER

6. For the digital data channel to be tested,

OUT OF TOL indicator lights and the number of the

connect timing and data cables between the data test set

channel under test appears in FAULT LOCATION

output and the appropriate channel T (timing) and D

display.

(data) multiplexer inputs. Connect timing and data

cables between the channel's demultiplexer T (timing)

NOTE

and D (data) outputs and the data test set input (figure 6-

9).

There may be several seconds of delay

before the MULTIPLEXER OUT OF TOL

7. Set data test set output for an error-free

indicator goes out when step 14 is

pseudorandom data pattern of 23-1 or greater bits in

performed.

length.

14. Repeat step 8 and observe that

MULTIPLEXER OUT OF TOL indicator goes out and the

number of the channel under test disappears from

FAULT LOCATION display.

15. Repeat steps 6 through 14 for each digital

channel being tested.

16.

Set POWER CONTROL switch to OFF and

disconnect all test setup cables.

6-41