Adtran MX2800 M13 User Manual

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61200290L1-1G

Appendix A, Acceptance Test Procedure

MX2800 M13 Multiplexer User Manual

3. At the DSX-1, install a bantam test cord from the 

 of the first DS1 channel to the 

 of the 

second; then connect a second bantam test cord from the 

 of the second DS1 channel to the 

 of the third DS1 channel. Repeat this procedure for all 28 DS1 channels.

4. Connect the 

 of the 28th DS1 channel to the 

 input of the DS1 test set.

5. Set the test set options for 

ESF/B8ZS,

 and run a standard BERT using QRSS or other preferred test 

pattern(s).

6. All alarms should clear on the MX2800, and the BERT should run error free. Troubleshoot as 

necessary.

7. Leave this test setup in place, as it will be used during the redundancy testing portion of this document. 

Proceed to 

This test is ordinarily a two-person operation, and it is the preferred means of testing system and cabling 
integrity. It tests one DS1 channel at a time, using a DS1 test set at the DSX-1 cross-connect panel or 
connecting equipment and a DS3 test set at the DSX-3 or connecting equipment location.

Equipment Required:

• 1 DS1 test set capable of running a BERT

• 1 DS3 test set capable of accessing and running a BERT on a single DS1

Follow these procedures to execute the head-to-head test.

1. At the DSX-3 cross-connect panel or connecting equipment, properly connect the DS3 test set to the 

DS3 coming from the MX2800. Confirm transmit and receive integrity, an integral step in the process.

2. Configure the DS3 test set for C-Bit Framing, the appropriate 

LBO,

 and set to drop out DS1 #1. 

Configure the DS1 BERT to run in ESF/B8ZS mode using QRSS or other preferred test pattern. 
Confirm that the MX2800 sees a good DS3 signal. The 

 LED should be solid green on 

the Active Controller, and the DS3 test set should be in frame synchronization with the MX2800.

3. At the DSX-1 cross-connect bay or connecting equipment, connect the DS1 test set to the first DS1 

channel of the MX2800. Configure the test set for the same framing, line code, and BERT pattern as 
the DS3 test set. Confirm a good, error-free BERT for a minimal period, such as 15 seconds.

4. Repeat for DS1 channels 2-28 by moving the DS1 test cables and reconfiguring the DS3 test set to 

drop out the appropriate DS1 channel under test.

5. The MX2800 condition is in an alarm because of the previously tested and now unterminated DS1 

ports, but this should not prohibit a successful BERT between the DS1 and DS3 test sets on the channel 
under test.

6. Leave this test setup in place, as it will be used during the redundancy testing portion of this document.