Chapter 5 Diagnostics
MX-2100/2104
Installation and Operation Manual
5-12
Diagnostic Tests
Local Modem
Remote Modem
User or Test
Equipment
Local
MX-2100
User or Test
Equipment
Remote
MX-2100
Figure 5-4. Main Link Modem Loop 2, Signal Path
Main Link Modem Loop 2 – Normal Indications and Fault Location
•
The TEST indicator of the MX-2100 lights.
•
The TXD and RXD indicators of the local MX-2100 must light, and the LOCAL
SYNC LOSS indicator must be off. If not, the connections and/or the link
between the two modems, or the modems, are defective.
I/O Module Loops and Tests
The tests available for I/O modules depend on the module type, however in
general all the I/O modules support local and remote channel loops, and the
monitoring of the transmit and receive activity and of the main control signals by
means of the front-panel indicators.
In addition, the MX-2100 supports module-specific tests:
•
For data I/O modules, the MX-2100 provides PRBS transmission and BERT
testing on individual channels. PRBS transmission allows supplying a test signal
to a data channel, and the BERT test provides a quick qualitative check of
transmission performance without requiring external data transmission test
equipment.
•
For voice I/O modules, the MX-2100 provides test tone injection. The test tone
can be heard by the subscribers connected to the voice channels, thus
providing a quick qualitative check of the voice path.
For specific information on the tests available for each I/O module, refer to the
corresponding module Operation and Installation manual.