3com S330 ユーザーズマニュアル

C

HAPTER

 5: P

ATH

B

UILDER

 S330 D

IAGNOSTICS

 

AND

 P

ERFORMANCE

 S

TATISTICS

BES—The number of bursty errored seconds (BESs) encountered by the VCM 
T1-DSX/E1 interface.

DM—The number of degraded minutes (DMs) encountered by the VCM 
T1-DSX/E1 interface.

LCV—The number of line coding violations (LCVs) encountered by the VCM 
T1-DSX/E1 interface.

Voice compression module VC statistics are frame and byte counts since the last 
counter reset. On the VCM VC Statistics window, you can reset the counter by 
entering c. VC statistics are displayed as a list rather than a table. The VCM 
T1-DSX and VCM E1 VC Statistics screens display the following statistics:

Received Frames—Total number of frames received over the virtual circuit.

Transmitted Frames—Total number of frames transmitted over the virtual circuit.

AAL5 Errors—The total number of invalid frames received over the virtual circuit. 
Invalid frames are frames that are received with good FCS but that cannot be 
processed due to wrong content.

Discarded Congested Frames—The total number of frames received over the 
virtual circuit that were discarded due to congestion. Congested frames are frames 
that were not transmitted due to link congestion.

The VCM Port Activity Statistics screen displays the following statistics for each 
channel.

ch—Channel number.

tx packets—Number of transmitted packets.

rx packets—Number of received packets.

tx bytes—Number of transmitted bytes.

rx bytes—Number of received bytes.

The PathBuilder S330/S310 provides you with circuit parameters and cell counts 
broken down in various ways:

n

by circuit

n

by port/group

n

by shaper

n

by buffer (queue)

These statistics enable you to look at the cell loss at various points in the data flow 
and adjust parameters—such as shaper values—accordingly.