SYSTEM NETWORK MODULE (SNM)

Main Transmit

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

2.Set S5 for 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 Test 8 (open section 4, close 1, 2 and 3).

6.Reset the module, Press S2 and release.

7.Adjust R86 to be -12 dBm ±0.5 dB at TP4.

8.Verify the level at J12 to be -21 dB ±1 dB from the maximum level from Step 1.

9.Select for normal operation (S5 all sections closed). 10.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 for 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.Close section 2 of S1.

7.Adjust R102 to be 0 dBm at TP8.

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

9.Reset the module, Press S2 and release.

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

Secondary Transmit and Receive

Not used since the secondary line is not used.

SNM

 

SNM

EA

 

EA

EB

 

EB

MA

 

MA

MB

 

MB

RXA+

 

RXA+

RXA-

 

RXA-

TXA+

 

TXA+

TXA-

 

TXA-

 

 

 

Figure 13-3 SNM CABLE LAYOUT

NOTE: This cabling is used within a single Switch or between Switches to allow Unique ID calls to occur.

13-4