Input Modules
G.703/9 Input Module
148
TSG-3800 User’s Guide
12778474-002-2 Revision F – March 2004
Enabling CRC Checking
You can configure the G.703/9 Input module to enable CRC checking when CAS is
also enabled. To configure CRC checking, set the jumper on TB2 as shown in
Table
5-8
.
Selecting the Input Impedance
You can terminate the G.703/9 input line with 75
Ω
, 120
Ω
, or 3.3 k
Ω
(bridging). To
select the impedance, set the jumper on TB4 as shown in
Table 5-9
.
Connecting to a Monitor Point
You can set the G.703/9 Input module for connection to a G.703/9 monitor point. To
connect the input signal to a 15 dB gain amplifier, set the jumper on TB1 as shown
in
Table 5-10
.
Installing the G.703/9 Input Module
The G.703/9 Input module can be installed in slots 1 through 4 of the TSG-3800
main shelf. The slot determines the priority level of the input signal; see
Slot
Location and Keyed Modules
, on page 61.
Table 5-8. Enabling CRC Checking
CRC
TB2 Jumper Position
Enabled
A to B
Disabled
B to C
Table 5-9. Selecting the Impedance
Input Impedance
TB4 Jumper Position
120
Ω
A to B
75
Ω
B to C
3.3 k
Ω
(bridging)
Remove jumper
Table 5-10. Enabling the Amplifier
Amplifier
TB1 Jumper Position
Disabled
A to B
Enabled
B to C
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