Adtran MX2800 M13 User Manual

MX2800 M13 Multiplexer User Manual

Loopbacks, Section 6

61200290L1-1G

    6-5

error count, and a clear error count option. See 

on page 6-5. Selecting Data Mode will cease the 

transmission of the QRSS pattern and start transmission of a loop down pattern as previously described.

When in CSU Loopback w/BERT, only the Data Mode for the T1 under
test may be selected. Selecting any other option results in an error
message.

A Line BERT enables the MX2800 to perform a “head-to-head” BERT test toward the CSU. Selecting 

Line 

BERT

 replaces all incoming network traffic for the selected T1 with an unframed QRSS pattern toward the 

CSU. When Line BERT is selected, additional menu items appear and show the state of pattern synchroni-
zation, cumulative error count, and a clear error count option. Selecting Data Mode ceases QRSS pattern 
generation and substitution of the incoming data stream.

When in Line BERT mode, only the Data Mode option for the T1 under
test may be selected. Selecting any other option will result in an error
message being displayed.