Specifications

D8E1T1 Installation and Operation Manual Chapter 4 Troubleshooting and Diagnostics
BERT (Bit Error Rate Test) 4-5
4.4 BERT (Bit Error Rate Test)
BERT is used to test the bit error rate of the communication circuit. The device
checks for errors by comparing a received data pattern with a known transmitted
data pattern to determine transmission line quality. If a pattern match cannot be
found, Errored Seconds counts are incremented to record the time during which a
pattern lock in the receive path could not be established. For troubleshooting
purposes, combining BERT with diagnostic loops is very useful in isolating
problems within a circuit. For the D8E1T1 module, there are 12 available BERT
patterns for the T1/E1 links (when in Clear T1/E1 Disabled mode).
T1/E1 Link BERT
Navigation:
D8E1T1 Main Menu
↓
Diagnostics
↓
Line Diagnostics Center
↓
Select a T1/E1 Link
↓
[B]ert
BERT Select
-------------
Link Number..: 1
Link Name....: Circuit Number
Current BERT.: Off
New BERT.....: Off
Available Bit Error Tests (BERTs)
---------------------------------
[o]ff
[A] Framed 2047 [0] Framed All Zeros (0x00)
[C] Framed 2^15 [1] Framed All Ones (0xFF)
[D] Framed 2^20 [2] Framed 3 in 24 (0x44,0x00,0x04)
[E] Framed 2^23 [3] Framed 1 in 8 (0x40)
[F] Framed 2^11 - 7 0's limits
[G] Framed 2^15 - 7 0's limits
[H] Framed QRSS
[I] Framed 2^23 - 14 0's limits
Figure 4-3. BERT Select Menu
The link must be in service and Clear T1/E1 must be disabled in order to perform
BERT.
Note