Specifications

Tests & Diagnostics MP-2100 HS-R Installation and Operation Manual
4-4 Troubleshooting Instructions
4.4 Troubleshooting Instructions
The loops available on the HS-R module provide a rapid and efficient way to
identify the general location of a fault either of the HS-R modules connected in a
link, in the external equipment, or in the connections to the channels.
If the LOS indicator of an HS-R channel lights, or a complaint is received regarding
the transmission of data through one of the HS-R channels, perform the following
procedure until the problem is located. After each step, continue to the next step
only if the previously specified test has been successfully completed.
If the problem is detected when a connection between two new users is activated
for the first time, before starting the troubleshooting procedure described below
thoroughly check the timeslot allocation, the configuration of the two Megaplex
units that provide the new connection, and the configuration of the user's terminal
equipment.
• Request the user to perform a local loopback test on the local data equipment.
If the user equipment does not receive its own signal, the problem is in the
user equipment. After correcting the problem, continue troubleshooting as
explained below.
• If the signal is not received when the remote digital loopback is activated,
activate the local main link loop on the local Megaplex unit:
 If the user equipment does not receive its own signal when the main link
loop is connected, the problem is in the local unit.
 If the signal is received when the main link local loopback is activated,
activate the remote main link loop.
If the user equipment does not receive its own signal, the problem is either
in the timeslot allocation, or in the remote unit.
Note