ADTRAN MX2800 STS-1 - Figure 6-8. VT Bert Test; Vt Bert

6-6 61204659L1-1A
Section 6, Loopbacks MX2800 STS-1 User Manual
VT/Port Loopbacks
VT BERT
A VT BERT test (Figure 6-8) enables the MX2800 STS-1 to perform a “head-to-head” BERT test toward
the STS-1 network. The VT BERT test replaces all incoming T1/E1 traffic for the T1/E1 mapped to the
selected VT with an unframed QRSS pattern toward the network. When VT BERT is selected, additional
menu items display to show the state of pattern synchronization, cumulative error count, and a clear error
count option. Selecting Data Mode will cease QRSS pattern generation and substitution of the incoming
data stream.
NOTE
When in VT BERT mode, only the Data Mode option for the VT/Port
under test may be selected. Selecting any other option will result in an
error message.
Figure 6-8. VT Bert Test
STS-1
MAPPER
T1/E1 LIU
(1 of 28)
T1/E1 LIU
(28 of 28)
STS-1
LIU
CODEC
(1 of 28)
CODEC
(28 of 28)
BERT
GENERATOR
BERT
CHECKER