Engineering Order Wire Test (Optional); Alarm Relays And I/O Dry Loops Test (Optional); Simulating An Idu Alarm; Simulating An Odu Alarm - Sagem -LINK F Installation And Operation Manual

SAGEM-LINK F
Installation and Operation Manual

2.6 - Engineering Order Wire Test (optional)

If the handsets have been ordered, the following test is made to verify EOW proper operation. This
test requires the presence of people in local and in remote station. Connect handset in each IDU of
the link (RJ11 connector)
•
From the local terminal press on the call button (PRESS). At the remote end the green led
corresponding to the EOW flashes. Verify that audio communication is operating properly
• Make the same test from the remote terminal.

2.7 - Alarm Relays and I/O Dry Loops Test (optional)

When alarm relays and I/O dry loops are used in the site, perform the following tests to verify proper
alarm operation.
This test is to be done on each end of the link.
Before starting the test verify that there is no alarm displayed in the equipment.
It is not possible to simulate all possible alarms without opening equipment : for instance, simulating a
Tx frequency alarm would require to open the ODU and to disturb externally the synthesizer phase
lock loop. However some alarms can be simulated with simple operations :

2.7.1 - Simulating an IDU Alarm

An IDU alarm could be easily simulated by entering a wrong Link ID code in the local terminal. This
wrong ID Code generates an IDU alarm, but does not affect modem or radio operation. To simulate an
IDU alarm :
•
Remove DC Power on the local terminal, and disconnect IDU to ODU cable
•
Power up the IDU, and change local ID Code.
•
Switch off again DC power and connect IDU to ODU cable
•
Switch on the IDU. Once the IDU is properly initialized, there should be an IDU alarm
displayed.
•
Once the test has been done, do not forget to write the right Link ID code using the same procedure.

2.7.2 - Simulating an ODU Alarm

An ODU alarm can be obtained by removing IDU to ODU cable. Prior to removing ODU cable, it is
necessary to switch off the cable interface module.

2.7.3 - Simulating a Tributary Alarm

A tributary alarm is obtained by changing the status of one tributary from normal (N) to invert (I), or
from invert to normal.
Once the test has been done, do not forget to restore the previous configuration.

2.7.4 - Simulating a RSL Alarm

To simulate a RSL Alarm, it should be necessary to diminish remote transmit power and to increase
RSL alarm threshold. (ATPC off).
Change the RSL alarm threshold to -60 dBm.
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Issue 04 : July 2005