12778474-002-2 Revision F – March 2004
TSG-3800 User’s Guide 275
Output Modules
G.703/13 Output Module
Table 7-49
describes the G.703/13 Output module front panel status indicators
(LEDs).
Functional Description
Refer to
Figure 7-24
for the following functional discussion. The module accepts two
reference input signals (A and B) from separate Frame Generator Modules. The
module selects and amplifies one signal (normally A). This signal couples to the
output ports through transformers.
If reference signal A fails, the module detects its loss and switches to reference
signal B. The processor can also switch references.
The module checks the outputs to confirm signal presence. Should an output fail,
the front panel OUTPUT FAULT indicator lights.
Newer versions of this module have a switch, S1, located in the lower left corner (as
viewed from the component side, with the edge connector down). This switch
selects between two pairs of reference input signals. In the pressed or “down”
position (default setting), the G.703/13 Output module uses the pair of signals on
the “CLK1” inputs. These are the reference signals used by all versions of this
module. In the “up” position, the “CLK2” inputs are selected. The CLK2 signals are
typically generated by the T1/E1 Frame Generator, 23478305-xxx-0. If this frame
generator is installed, S1 may be set to the “up” position. Otherwise, S1 must be
pressed to select the CLK1 inputs.
Table 7-49. G.703/13 Output Module Status Indicators
Indicator
Color
Description
Power
Green
On = The module is receiving power.
Input Fault A
Amber
On = No reference signal applied to input A.
Input Fault B
Amber
On = No reference signal applied to input B.
Output Fault
Red
On = Output failure on one or more channels.
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