EFJohnson 3000 SERIES - Manual (Page 90)

DISPATCH CHANNEL MODULE (DCM)
10-2
10.2.4 DCM BACKPLANE EXTERNAL
CONTACTS
See the Backplane Section 23 for pinouts on the
shelf backplane and wire harness pinouts.
10.3 DCM ALIGNMENT SPECIFICATIONS
10.3.1 PRE-ALIGNMENT
The DCM is pre-aligned with the Basic Board
Module alignment procedures (refer to Section 7.3).
10.3.2 DCM ALIGNMENT PROCEDURE
Connections to the DCM 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
Determine the maximum transmit level that is sent by
the ancillary equipment to the interface module.
1. Select Test 1 (S5, open section 1, close sections 2, 3
and 4).
2. Reset the module, Press S2 and release.
3. 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.
4. Adjust R41 to be -6 dBm at J11.
5. Adjust R102 to be 0 dBm at TP8.
6. Select for normal operation (S5 all sections closed).
7. Reset the module, Press S2 and release.
Example: Microwave has +7 dBm maximum
output, set J11 for -5 dBm.
Table 10-3 DCM EXTERNAL CONNECTIONS
Backplane
P34 to P45
Description
Wire Harness
J1,3,5,7
pin 27
pin 28
pin 29
pin 30
pin 31
pin 32 Sec Rx +
Sec Rx -
EA lead
EB lead
Pri Rx Audio+
Pri Rx Audio-
pin 1
pin 2
pin 3
pin 4
pin 5
pin 6 RxS+
RxS-
EA
EB
RxA+
RxA-
J2,4,6,8
pin 59
pin 60
pin 61
pin 62
pin 63
pin 64 Sec Tx +
Sec Tx -
MA lead
MB lead
Pri Tx Audio+
Pri Tx Audio-
TxS+
TxS-
MA
MB
TxA+
TxA-
pin 1
pin 2
pin 3
pin 4
pin 5
pin 6