DIDCSU T1 Version
Verilink DIDCSU 2912 User Manual
3-23
•
BER—Bit Error Rate.
•
CGA—Carrier Group Alarm
Enter “C” to access the
Counter Menu
. These counts are
continuous until reset manually using the
R
n
option.
Figure 3-15 Counter Menu
Table 3-11 Counter Menu Parameters
Select “P” for Display Performance Data from the
Performance/Status Menu
to access the
Performance/Status
Menu (24-hour T1 Performance Data Summary)
.
Command
Description
C
Display Counters: Displays the Counter Menu.
Counts the number of BPV, FE, ESF, and CRC errors:
• Bipolar Violations (BPV): A violation of the T1 bipolar alternate mark inversion
transmission pattern in which consecutive ONEs (pulses) are erroneously transmitted as
pulses of like polarities. Bipolar violations normally indicate transmission errors.
• Frame Bit Error (FE): The number of whole seconds in which a framing bit error has been
received.
• Extended Superframe Format (ESF): This is the AT&T T1 framing standard that provides
frame synchronization, cyclic redundancy check, data checking, and link bits. This
counter is only available in ESF mode.
• Cyclic Redundancy Check (CRC): An error-checking algorithm performed on data
transmissions. On a frame-by-frame basis, a numerical value is derived from the data in
the bit stream at one end of transmission. When each frame reaches the receive end, the
cyclic redundancy check is calculated again and compared with the value generated by
the transmit-side data. Discrepancies can indicate one or more transmission errors. This
counter is only available in ESF mode.
Rn
Reset Counters: Returns the values of the BPV, FE, ESF, and CRC counters to zero or N/A.
X
Exit the Counter Menu screen.
-- DIDCSU 2912 COUNTER MENU --
-- DIDCSU 2912 COUNTER MENU --
-- DIDCSU 2912 COUNTER MENU --
-- DIDCSU 2912 COUNTER MENU --
BPV FE ESF CRC
BPV FE ESF CRC
BPV FE ESF CRC
BPV FE ESF CRC
PORT 1 0 257 0 0
PORT 1 0 257 0 0
PORT 1 0 257 0 0
PORT 1 0 257 0 0
PORT 2 0 6 17173 0
PORT 2 0 6 17173 0
PORT 2 0 6 17173 0
PORT 2 0 6 17173 0
Rn) Reset counters X) exit this screen
Rn) Reset counters X) exit this screen
Rn) Reset counters X) exit this screen
Rn) Reset counters X) exit this screen
A [0.0.0.204] [1,2] DIDCSU 2912 >
A [0.0.0.204] [1,2] DIDCSU 2912 >
A [0.0.0.204] [1,2] DIDCSU 2912 >
A [0.0.0.204] [1,2] DIDCSU 2912 >
