Specifications

FOMi-E1/T1 Installation & Operation Manual Chapter 4. Troubleshooting & Diagnostics
Diagnostic Tests 4-5
4.3 Diagnostic Tests
FOMi-E1/T1 supports several types of loopbacks for checking the
communication between the attached equipment and the local modem as
well as the communication between the modems.
Use the test procedures provided in this chapter to verify normal system
operation and to isolate faulty equipment and lines in the event of failure.
Do not perform tests with faulty equipment. Before performing a test, either
have the equipment repaired or replace it with a functioning unit.
The following loop tests are available:
•
Local Analog Loopback (LLB)
•
Remote Digital Loopback (RLB)
•
Remote Digital Loopback + BER (RLB + BERT).
Note
Before testing the operation of the data system equipment and its line
circuits, ensure that all units are turned on and are configured correctly. Loop
tests are best performed in the order presented here.
Table 4-5 details TESTS-menu configuration options.
Table 4-5 TESTS Menu Options
Menu
Options
Indicates Parameter
Values
Description
LLB Currently
Performed Test
OFF
ON
Analog loopback, activated from the front panel, from a
PCU, or from the remote unit.
RLB Currently
Performed Test
OFF
ON
Digital loopback, through the remote modem and
remote DTE, activated from the front panel, from the
PCU, or from the remote unit.
RLB +
BERT
Currently
Performed Test
OFF
ON
A remote digital loopback with internal BER tester.
BERT Currently
Performed Test
OFF
ON
Built-in pattern generator and tests, activated from the
front panel, from the PCU, or from the remote unit.
Performs BER test over the link.
LED TEST Currently
Performed Test
OFF
ON
LEDs test, activated from the front panel or the PCU.
Local Test - Local
Analog Loopback
(LLB)
The LLB test checks the performance of the local FOMi-E1/T1 modem, the
local data terminal, and the connections between them (see Figure 4-2). It is
performed separately at the local and the remote site.