CONVENTIONAL CHANNEL MODULE (CCM)

9.2.4CCM BACKPLANE EXTERNAL CONTACTS

See Backplane Section 23 for pinouts on the shelf backplane and wire harness pinouts.

Table 9-3 CCM EXTERNAL CONNECTIONS

Backplane

Description

Wire Harness

P34 to P45

J1,3,5,7

 

 

 

 

 

pin 27

Sec Rx +

pin 1

RxS+

pin 28

Sec Rx -

pin 2

RxS-

pin 29

EA lead

pin 3

EA

pin 30

EB lead

pin 4

EB

pin 31

Pri Rx Audio+

pin 5

RxA+

pin 32

Pri Rx Audio-

pin 6

RxA-

 

 

J2,4,6,8

 

 

 

 

pin 59

Sec Tx +

TxS+

pin 1

pin 60

Sec Tx -

TxS-

pin 2

pin 61

MA lead

MA

pin 3

pin 62

MB lead

MB

pin 4

pin 63

Pri Tx Audio+

TxA+

pin 5

pin 64

Pri Tx Audio-

TxA-

pin 6

9.3 CCM ALIGNMENT SPECIFICATIONS

9.3.1 PRE-ALIGNMENT

The CCM is pre-aligned with the Basic Board Module alignment procedures, Refer to Section 7.3.

9.3.2 CCM ALIGNMENT PROCEDURE

Connections to the CCM may take several forms:

1.Direct Connection

2.Leased Lines

3.Microwave Link

4.T1 Channel Bank Interfaces

This ancillary equipment requires certain input and output levels for proper operation. The module should be adjusted accordingly.

Main Transmit

1.Determine the maximum level to be received by the ancillary equipment to be transmitted.

2.Select Test 1 (S5, open section 1, close sections 2, 3 and 4).

3.Reset the module, Press S2 and release.

4.Adjust R44 for -12 dB from the maximum level in Step 1 at J12.

5.Select for normal operation (S5 all sections closed).

6.Reset the module, Press S2 and release.

Example: Microwave has -16 dBm max input, Set J12 for -28 dBm.

Main Receive

1.Determine the maximum transmit level that is sent by the ancillary equipment to the interface module.

2.Select Test 1 (S5, open section 1, close sections 2, 3 and 4).

3.Reset the module, Press S2 and release.

4.Insert the maximum level determined in Step 1 using a 600 ohm audio oscillator into EQU port of J1. Otherwise, set the ancillary equipment to send the maximum level alignment tone to the interface module.

5.Adjust R41 to be -6 dBm at J11.

6.Adjust R102 to be 0 dBm at TP8.

7.Select for normal operation (S5 all sections closed).

8.Reset the module, Press S2 and release.

Example: Microwave has +7 dBm maximum output, set J11 for -5 dBm.

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