Table 6-2 Bert Header Bit Map - Cisco 678 Installation And Operation Manual

BERT Testing (Cisco 675, Cisco 675e and Cisco 676 only)
Initiate the BERT test:
Step 4
cbos#
Set the header bits of the outgoing cells and qualify the incoming cells.
Step 5
Enter:
Step 6
cbos#
Note
Example: VPI=1, VCI=1 (GFC=0, PTI=0, CLP=0) across the ADSL loop (see
command line above).
Table 6-2
7
Display a count of the BERT errors and cell loss since the previous query:
Step 7
cbos#
Note that the two LEDs on the left of the CPE take on a new meaning during the
Step 8
BERT tests.
•
•
During a successful BERT test, the LED at the left will be illuminated, and the
second LED from the left will be solid (either off or on, but not blinking).
Cisco 600 Series Installation and Operation Guide
6-12
debug bert on
debug bert header 00100010
Note that these are the four bytes of header not including the
calculated HEC byte. Table 6-2 provides descriptions of the
bit fields.
BERT Header Bit Map
6 5
GFC
VPI
VCI
VCI
debug bert count
BERT SYNC LED—This is the LED at the left (WAN-ACT) and is
illuminated once the PE detects a valid BERT pattern.
BERT ERROR LED—This is the second LED from the left (WAN-LNK) and
is toggled whenever the CPE detects a BERT error.
4 3 2
PTI
Chapter 6 Troubleshooting
1 0
VPI
VCI
VCI
CLP
78-11190-01