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Appendix A, Acceptance Test Procedure MX2800 M13 Multiplexer User Manual
3. Remove the loopback from the DS3 and ensure that no other DS3 signal is entering the MX2800
through the DSX-3 cross-connect bay or connecting equipment, such as DCS.
4. The MX2800 should go into Critical alarm, thus closing the relay contacts and sending the alarm to the
alarm monitoring equipment.
5. Verify that the alarm is being properly reported as a Critical alarm.
Noncritical Alarm Relay Test
This test actuates the Noncritical alarm relay contacts.
Equipment Required:
• 1 DS3 DSX test cord
Follow these procedures to test one the noncritical alarm relay.
1. Ensure that the DS3 is not in alarm. The
DS3 STATUS LED should be solid green on the Active Con-
troller. To do this, re-install a hard loopback of the DS3 toward the MX2800.
2. Ensure that the 28 DS1s are out of alarm. To accomplish this, proceed as follows:
a. At the DSX-1 cross-connect, insert the
Transmit 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.
b. Repeat this procedure for all 28 DS1 channels. Connect the
Output of the 28th DS1 channel to the
Receive of the DS1 test set. Configure the test set for ESF/B8ZS and run a standard BERT test
using QRSS or other preferred test pattern(s).
3. Nothing should be in alarm. The
DS1 STATUS LEDs should all be solid green on the Active
Controller. Remove any one of the bantam cords from the DSX bay. Removing this cord causes a DS1
LOS alarm, which results in the actuation of the Noncritical alarm relay.
4. Verify that the Noncritical alarms are being properly reported to the office alarm monitoring
equipment.
6. VERIFYING SYSTEM REDUNDANCY
This section addresses the redundancy features of the MX2800. The MX2800 supports redundancy of both
the Power Supply and Controller Modules. The equipment configuration (nonredundant vs. redundant and
type of power redundancy) are useful in determining what can and cannot be tested. The following sections
describe the tests for various configurations.
Power Supply Redundancy
When installed, the MX2800 can be wired to have either one or two –48 VDC power feeds A and B. In
addition, the MX2800 chassis can be equipped with either one or two Power Supply modules. Test scenar-
ios for the two most common configurations follow. Testing of the other configurations is a subset of the
following.