CONVENTIONAL PATCH MODULE (CPM)

Table 21-3 BACKPLANE PLACEMENT

Backplane

Description

Wire Harness

P34 to P45

 

J1,3,5,7

 

 

 

 

 

 

pin 27

Sec Rx +

pin 1

Signal

pin 28

Sec Rx -

pin 2

Ground

pin 29

EA lead

pin 3

 

pin 30

EB lead

pin 4

 

pin 31

Pri Rx Audio+

pin 5

RX+

pin 32

Pri Rx Audio-

pin 6

RX-

 

 

 

J2,4,6,8

 

 

 

 

pin 59

Sec Tx +

Signal

pin 1

pin 60

Sec Tx -

Ground

pin 2

pin 61

MA lead

 

pin 3

pin 62

MB lead

 

pin 4

pin 63

Pri Tx Audio+

Tx+

pin 5

pin 64

Pri Tx Audio-

Tx-

pin 6

21.2.3 E-LEAD SELECTION

If the PTT from the console is an open contact relay, either of the above options for J36 may be used.

If the PTT is a closure to ground with a pull-up resistor to a positive voltage, J36, pin 2 should be connected to ground without connection to pin 1 or pin 3.

21.2.4CPM BACKPLANE EXTERNAL CONTACTS

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

21.3 CPM ALIGNMENT SPECIFICATION

21.3.1 PRE-ALIGNMENT

The CPM is pre-aligned with the Basic Board Module alignment procedures (Refer to Section 8.3).

21.3.2 ALIGNMENT

Connections to the CPM 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.Set S5 to Test 1 (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.Set S5 for normal operation (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.Set S5 to Test 1 (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 alignment tone to the interface module.

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

6.Set S5 for normal operation (all sections closed).

7.Reset the module, Press S2 and release.

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

Secondary Transmit and Receive

Not aligned since the CPM does not use FSK signaling.

21-2