EFJohnson 3000 SERIES Manuale Utente
SYSTEM NETWORK MODULE (SNM)
13-4
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.
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.
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.
output, set J11 for -5 dBm.
Secondary Transmit and Receive
Not used since the secondary line is not used.
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.
EA
EB
MA
MB
EB
MA
MB
RXA+
RXA-
TXA+
TXA-
RXA-
TXA+
TXA-
EA
EB
MA
MB
RXA+
RXA-
TXA+
TXA-
EB
MA
MB
RXA+
RXA-
TXA+
TXA-
SNM
SNM