
CONVENTIONAL CHANNEL MODULE (CCM)
9.2.4CCM BACKPLANE EXTERNAL CONTACTS
See Backplane Section 23 for pinouts on the shelf backplane and wire harness pinouts.
TableBackplane | Description | Wire Harness | ||
P34 to P45 | J1,3,5,7 | |||
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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- | |
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| J2,4,6,8 | ||
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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 | |
9.3.1
The CCM is
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
5.Select for normal operation (S5 all sections closed).
6.Reset the module, Press S2 and release.
Example: Microwave has
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.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