Ds1 to ds3 head-to-head test – ADTRAN MX2800 M13 User Manual
Page 162
A-6
61200290L1-1G
Appendix A, Acceptance Test Procedure
MX2800 M13 Multiplexer User Manual
3. At the DSX-1, install a bantam test cord from the
Output
of the first DS1 channel to the
Input
of the
second; 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.
4. Connect the
Output
of the 28th DS1 channel to the
Receive
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.
DS1 to DS3 Head-to-Head Test
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
DS3 STATUS
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.