Specifications

Alarms & Diagnostics
MP2100M-LS-2 Modules - Installation and Operation Manual 3-3
3.3 Diagnostics
Loopback Types
The LS-2 modules have an extensive set of test loopbacks that includes local
and remote loopbacks on each channel.
When a test or loopback is activated, the user can also specify the time it
remains active: the range is 1 through 30 minutes, in 1-minute steps. After the
specified time, the test or loopback is automatically deactivated, thereby
reducing the management workload during system troubleshooting. The default
selection is continuous connection, that is, the test or loopback remain active
until canceled by a user's command.
The following sections describe the available diagnostic activities.
Local and Remote Main (Composite Channel) Loopback
The local and remote main loopback are performed at the same time. The local
loopback returns the transmit signal arriving from the user on the receive path.
The remote loopback returns the signal received from the remote user. When
everything is working O.K., all the local channels and all the remote channels
should receive their own transmissions.
The loopback signal path is shown in figure 3-1.
MTLS-2
I/O MODULES
MTLS-2
I/O MODULES
Local Unit
System
Management
Remote Unit
User or
Test
Equipment
Channel 1
Channel 2
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MEGAPLEX
System
MEGAPLEX
System
User or
Test
Equipment
Figure 3-1. Local and Remote Main Loopback