3com DSA-3CV1100-02 User Manual
128
T
ROUBLESHOOTING
HDLC Traffic Counters
The normal frame counters indicate HDLC traffic counters between the
CPE and the VCN AC. Some errored frame counters indicate fatal errors,
requiring replacement of the VCN AC, or handling of environmental
noise over the line.
CPE and the VCN AC. Some errored frame counters indicate fatal errors,
requiring replacement of the VCN AC, or handling of environmental
noise over the line.
presents normal counter indications and probable causes of
abnormal counter indications.
CRC error,
overrun,
Alignment
error, frame too
long, frame too
short
overrun,
Alignment
error, frame too
long, frame too
short
Containing receive
errors.
errors.
Zero
Hardware failure:
VCN AC port,
Ethernet cable or
Ethernet switch
VCN AC port,
Ethernet cable or
Ethernet switch
Table 17 Ethernet Traffic Counters (continued)
Counter
Counts the Frames Normal Count
Abnormal Count
Indicates
Indicates
Table 18 HDLC Traffic Count Indicators
Counter
Counts the Frames
Normal Count
Abnormal count
indicates
indicates
Tx frames
Sent via the
telephone line
telephone line
High
No transmit data
Rx frames
Received via
telephone line
telephone line
High
No receive data
Tx discarded
The VCN AC was
unable to send
unable to send
Low
VCN AC software
limitation
limitation
Rx discarded
The VCN AC (CO)
was unable to receive
was unable to receive
Low, unless the
traffic is
bi-directional
traffic is
bi-directional
VCN AC software
limitation
limitation
Overrun, Not
mine, DPLL error
Abort sequence,
Non aligned,
CRC error,
Frame too long
mine, DPLL error
Abort sequence,
Non aligned,
CRC error,
Frame too long
Containing Receive
errors
errors
Low
VCN AC hardware
failure if the number of
errors is growing.
failure if the number of
errors is growing.