Adtran MX2800 M13 User Manual

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61200290L1-1G

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.

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 

 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 

 of the DS1 test set into the 

 of the first DS1 

channel of the MX2800. Install a bantam test cord from the 

 of the first DS1 channel to the 

 of the second DS1 channel. Then connect a second bantam test cord from the 

 of the 

second DS1 channel to the 

 of the third DS1.

b. Repeat this procedure for all 28 DS1 channels. Connect the 

 of the 28th DS1 channel to the 

 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 

 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.

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.

When installed, the MX2800 can be wired to have either one or two –48 VDC power feeds 

and 

. 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.