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Once the Model 1193RC is properly configured and installed, it should
operate transparently. This sections describes power-up, LED status moni-
tors, and the built-in loopback test modes.
5.1 LED STATUS MONITORS
The Model 1193RC features six front panel status LEDs that indicate
the condition of the modem and communication link. Figure 10 below
shows the front panel location of each LED.
Functions of LEDs are as follows:
Fiber
The green Fiber LED indicates reliable data on the fiber side.
E1
The green E1 LED indicates reliable data on the G.703/G.704
side.
LOS
The red LOS indicates that syncronization between modems
has not been established. Blinking red LOS LED indicates the
presence of coding errors.
NS
The red NS LED indicates that the signal on the fiber side is
too weak to be detected. That could be due to any of the following
reasons:
- break in the fiber optic cable
- length of the fiber optic cable exceeds the maximum distance
- problem with Fiber LED.
ER
Flashing red ER LED indicates errors in 511 test pattern
TM
The yellow TM LED indicates that the modem is in a test mode
(Local/Remote Loopback or 511/511E test pattern). Opaque LED
indicates normal operation.
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5.2 POWER-UP
After both the local and remote Model 1193RCs are powered
up, a synchronization process will occur to establish a link. The synchro-
nization process should take approximately 5 seconds. Any time one of
the Model 1193RCs lose power (i.e., in a lightning storm), the local and
remote units will re-synchronize before they can resume data transmis-
sion.
When the local and remote Models 1193RC have established a link
and are passing reliable data, the following LED conditions will exsit:
· Fiber = GREEN
· E1 = GREEN
· LOS = OFF
· NS = OFF
· ER = OFF
· TM = OFF
5.2 TEST MODES
The following section describes the test patterns and loopbacks
used in the Model 1193RC. The Model 1193RC offers V.54 compliant
local/remote loopback tests, plus a built-in V.52 BER test pattern gener-
ator to evaluate the condition of the modems and the communication
link. These tests can be activated physically from the front panel.
5.2.1 Local Loopback
The local loopback test checks the operation of the local Model
1193RC, and is performed separately on each unit. The following sec-
tion describes how to perform a local loopback test between the
Network and a local connection.
Any data sent to the local Model 1193RC in this test mode will be
echoed (returned) to the user (see Figure 11 below). If two Model
1193RC units are linked when the LAL is activated, data sent from the
remote modem will also be looped back to the remote terminal equip-
ment.
To test the local connection, follow these steps:
1. Activate LAL by moving the front panel toggle switch RIGHT to
"Local". Once the Local Loopback is activated, the Model 1193RC trans-
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Figure 11. Local loopback diagram
G.703/G.704
Network
Figure 10. Front Panel of 1193RC
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