Noncritical alarm relay test, Verifying system redundancy, Power supply redundancy – ADTRAN MX2800 M13 User Manual

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A-8

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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

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.