Verilink DIDCSU 2912 Manual page 63

Dual integrated data service unit/channel service unit

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Figure 3-15 Counter Menu

DIDCSU 2912 COUNTER MENU --

PORT 1

PORT 2

Rn) Reset counters

A [0.0.0.204] [1,2] DIDCSU 2912 >

Table 3-11 Counter Menu Parameters

Command

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.

Reset Counters: Returns the values of the BPV, FE, ESF, and CRC counters to zero or N/A.

Exit the Counter Menu screen.

• BER—Bit Error Rate.

• CGA—Carrier Group Alarm

Enter "C" to access the Counter Menu. These counts are

continuous until reset manually using the Rn option.

BPV

ESF

257

17173

Select "P" for Display Performance Data from the

Performance/Status Menu to access the Performance/Status

Menu (24-hour T1 Performance Data Summary).

Verilink DIDCSU 2912 User Manual

CRC

X) exit this screen

Description

DIDCSU T1 Version

3-23

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