Instruction manual

Section 4 User Interface Guide Total Access 850 System Manual

L2 PROTOCOL (T1 ATM–T1–ATM) > STATUS > PVC STATUS > PROTOCOL STATUS

Use these menus to view the AAL2 STATS, POTS STATS, and to CLEAR STATS for the PVC Protocol.

AAL2 STATS

ATM Adaptation Layer 2 statistics is used to provide error information on voice traffic. This menu

displays

RX AAL2 HEC ERRORS, RX AAL2 SEQK ERRORS, RX VOICE SEQ ERRORS, RX VOICE BAD

CID

, RX VOICE BAD UUI, RX VOICE EOC CELLS, and PEAK CELL RATE.

RX AAL2 HEC ERRORS

A CRC code (used for data integrity checks) is contained in the last byte of an AAL2 header. A

received HEC error could result in dropped packets and poor voice quality.

RX AAL2 SEQK ERRORS

A single bit of the AAL2 header is used as a sequence bit and toggles from 1 to 0 with each

successive transmitted cell. If two cells are received back to back with the same sequence bit, a

sequence error is denoted.

RX VOICE SEQ ERRORS

Indicates that the Total Access 850 received voice packets that were out of sequence according to

the voice sequencing bits. The Total Access 850 does not drop these packets, but the error is

logged because invalid sequence numbers were received.

RX VOICE BAD CID

Indicates that the channel identifier (used for identifying voice calls in the ATM cell) was not

valid.

RX VOICE BAD UUI

The User Indication designates the signaling bit pattern for PCM/ADPCM and identifies the

packet as Type 1 (voice) or Type 3 (signaling). This error indicates the Total Access 850

received an incorrectly formatted UUI.

RX VOICE EOC CELLS

Indicates an EOC cell was received with a voice designation.

PEAK CELL RATE

Indicates the number of times (since the last statistics reset) that the PVC has reached the peak

cell rate.