ADTRAN 606 L2 Protocol T1 ATM-T1-ATM Status PVC Status Protocol Status, CRC Errors, AAL2 Stats

Section 4 User Interface Guide	Total Access 600 Series System Manual
CRC ERRORS	Number of AAL5 CRC Errors.
REASSEMBLY TIMEOUTS	Number of AAL5 Reassembly Timeouts.
TOO LONG FRAMES	Number of AAL5 Too Long Frames.
CLEAR COUNTS	Clears all recorded statistics and returns all counters to 0.

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 SEQ 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 SEQ 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 600 Series received voice packets that were out of sequence according to the voice sequencing bits. The Total Access 600 Series 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 600 Series received an incorrectly formatted UUI.

RX VOICE EOC CELLS

Indicates an EOC cell was received with a voice designation.

110 © 2004 ADTRAN, Inc. 61200624L1-1B