BIT COUNT INTEGRITY TEST

T.O. 31W2-2GSC24-2

TM 11-5805-688-14-1

NAVELEX 0967-LP-545-3010

NOTE

The audio oscillator and voltmeter used in

Cable requirements are identified in figure

the following procedures are Hewlett-

6-10.

Packard Models 204C (option 25) and 403B

2. If testing is performed in a shop area,

(option 001), respectively, configured as

connect multiplexer set to a source meeting the power

part of the Hewlett-Packard Model 3550B

requirements specified in table 1-1.

portable test set. Equivalent items may be

substituted. Voice channel input/output

Set POWER CONTROL switch to ON.

impedance is 600 ohms (balanced).

Momentarily

press

DISPLAY

RESET

7. Set audio oscillator output frequency to

switch.

1000 Hz +5 percent.

5. Observe that POWER CONTROL ON

Set audio oscillator output level to -16 +0.1

indicator is lighted and the following indicators are out:

dBm.

LOSS OF MUX TIMING

9. Measure audio voltage amplitude appearing

at the channel's demultiplexer output. Amplitude should

LOSS OF DEMUX TIMING

be +7 +0.1 dBm.

LOSS OF FRAME A

10. Repeat steps 6 through 9 for each voice

channel being tested.

LOSS OF FRAME B

11. Set POWER CONTROL switch to OFF and

LINK ERROR RATE

disconnect all test setup cables.

POWER SUPPLY

6-42. BIT COUNT INTEGRITY TEST. Perform digital

channel bit count integrity (BCI) test as follows:

TEMPERATURE

NOTE

MULTIPLEXER CARD

Testing of the BCI requires that the

DEMULTIPLEXER CARD

multiplexer set be set up in a full duplex

configuration. Refer to chapter 3 for setup

NOTE

instructions.

At very low multiplexer output rates

1. Connect cables between multiplexer MUX

(Ro), the time for initial frame

DATA OUT and demultiplexer DEMUX DATA IN

synchronization by the demultiplexer

connectors, and between multiplexer MUX TIMING OUT

may approach 6 minutes. Also, it may

and demultiplexer DEMUX TIMING IN connectors (figure

be necessary to momentarily press the

6-9).

DISPLAY RESET switch to extinguish

the LOSS OF FRAME B indicator

following initial frame acquisition by the

demultiplexer.

6-40