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MX2800 STS-1 User Manual
5.
VERIFY ALARMS
The MX2800 has two sets of alarm relay contacts available for connection to external alarm systems. They
are located on the back panel, and are designated as CRITICAL and NON-CRITICAL (the Critical/Major/
Minor, and Audible/Visual nomenclature is not used on the MX2800 product). The CRITICAL alarm is
activated when the STS-1 port experiences a Loss of Signal (LOS) event. The NON-CRITICAL alarm is
activated when one of the 28 DS1 ports experiences a Loss of Signal event. Normally OPEN and Normally
CLOSED contacts are available for each of the two relay outputs.
The tests are described below:
CRITICAL Alarm Relay Test
This test will actuate the CRITICAL alarm relay contacts of the back panel of the MX2800.
1. Ensure that the STS-1 is not in alarm. The easiest way to do this is to install a hard loopback of the
STS-1 toward the MX2800 using a test cord at the STS-1 DSX cross-connect bay. With the loopback
in place, all alarms should clear on the STS-1 port. (Use the STATUS LED's on the front panel to
determine the state of the STS-1 port. Refer to
meanings of the LED states).
2. Remove the loopback from the STS-1, and insure that no other STS-1 signal is entering the MX2800
through the STS-1 Cross-connect bay (i.e. another upstream MUX).
3. The MX2800 should go into CRITICAL alarm, thus closing the relay contacts and sending the alarm
to the Central Office alarm monitoring equipment.
4. Verify that the alarm is being properly reported.
NON-CRITICAL Alarm Relay Test
This test will actuate the NON-CRITICAL alarm relay contacts on the back of the MX2800.
1. Ensure that the STS-1 is not in alarm. The easiest way to do this is to install a hard loopback of the
STS-1 toward the MX2800 using a test cord at the STS-1 DSX cross-connect bay. With the loopback
in place, all alarms should clear on the STS-1 port. (Use the STATUS LED's on the front panel to
determine the state of the STS-1 port. Refer to
meanings of the LED states).
2. Ensure that the 28 DS1's are out of alarm. The easiest way to accomplish this is as follows: At the
DSX-1 cross-connect, insert the TX output of the DS1 test set into the INPUT of the first DS1 channel
of the MX2800. Install a Bantam test cord from the OUTPUT of the first DS1 channel to the INPUT of
the second DS1 channel. Then connect a second Bantam test cord from the OUTPUT of the second
DS1 channel to the INPUT of the third DS1 channel. Repeat this procedure for all 28 DS1 channels.
Connect the OUTPUT of the 28
options for ESF/B8ZS and run a standard BERT test per operating company practices.
3. At this point, nothing should be in alarm. Remove any one of the Bantam cords from the DSX bay.
This will cause a DS1 LOS alarm, which will result in the actuation of the NON-CRITICAL alarm
relay.
4. Verify that the alarm is being properly reported to the Central Office alarm monitoring equipment.
61204659L1-1A
Controller Card Status LEDs
Controller Card Status LEDs
th
DS1 channel to the RX input of the DS1 test set. Set the test set
Acceptance Test Procedure, Appendix A
on page 2-14 for the
on page 2-14 for the
Verify Alarms
A-7
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