Specifications

Installation and Operation Manual Chapter 4 Troubleshooting and Diagnostics
MPW-1 MP-4100 Ver. 2.0 Diagnostic Functions 4-21
Remote Loopback on Selected Internal DS1 Port Timeslots
The signal paths for a remote loopback on timeslots are shown in Figure 4-2 .
Megaplex-4100
Pseudowire
Cross-Connect
Matrix
MPW-1 Module
TDM
Cross-Connect
Matrix
Packet
Processor
Ethernet
Switch
To PSN
To TDM
Buses
Figure 4-2. Remote Loopback on Selected Internal DS1 Port Timeslots, Signal Paths
The remote loopback on timeslots of an MPW-1 port is used to return the receive
payload carried by selected timeslots of the tested port through the same
timeslots of the transmit path. The corresponding timeslots received from the
local equipment are disconnected.
This test is recommended for testing signal paths from a remote equipment unit,
through a selected pseudowire served by the corresponding MPW-1 port.
The loopback is activated within the MPW-1 cross-connect matrix, and only on
the timeslots specified by the user during the activation of the loopback. As a
result, there is no disturbance to services provided by means of the other
timeslots (pseudowires) of the same port: only the flow of payload carried by the
specified timeslots is disrupted.
For the supervision terminal, use the following procedure to activate/deactivate a
remote loopback on a selected timeslot (for detailed instructions, refer to the
Megaplex-4100 Installation and Operation Manual ):
1. Open the Diagnostics > Physical Layer > I/O menu, and then select the I/O
slot of the desired MPW-1 module. The selection screen displays only
modules installed in the Megaplex-4100.
2. On the module Diagnostics > Physical Layer > I/O > Port screen, select the
MPW-1 port to be tested, in the range of Int DS1 1 to Int DS1 8. Only
connected ports can be tested.
3. If necessary, select the loopback duration on the Diagnostics >
Physical Layer > I/O > Time Out screen. The loopback will be automatically
deactivated after the specified interval.