Signal Input Connections; Input Impedance Selections - Symmetricom TSG-3800 Series User Manual

Note: Input Port labeling on the rear panel of the TSG-3800 may
indicate the references used with previous software versions.
The Wire Wrap headers/DB-9 connectors are designated J1 (PRI), J2 (SEC), J3
(AUX1), and J4 (AUX2).
each connector is connected to Ground and is usually connected to the cable shield
(sleeve). Tip 1 (+) and Ring 1 (–) are the signal input pins used by all Input modules,
and are the pins to which the external reference is connected. For 3-Port modules,
Tip 2 (+) and Ring 2 (–) are used for input port 2. Tip 3 (+) and Ring 3 (–) are used
for input port 3. Tip 2 (+) and Ring 2 (–) are used by the Clock Input module for
connecting an external Fault Signal; for example, Cesium PRS.
Figure 2-6.

Signal Input Connections

Selectable input impedances are provided on the Input modules (see
BNC- to-WW connector, item number 12012421-000-0, is available for connecting
coaxial cable.
Table 2-4. Input Impedance Selections
Input Type
DS1 Inputs
E1 Inputs
Clock Inputs
12778474-002-2 Revision F – March 2004
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Figure 2-6 shows the pinouts for these connectors. Pin 1 of
Selections
100 Ω 100 Ω
3.3 kΩ (for bridging)
75 Ω 120 Ω
120 Ω
3.3 kΩ (for bridging)
50 Ω 50 Ω
Making Electrical Connections
Default
TSG-3800 User's Guide
Installing the TSG-3800
Table 2-4). A
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