Using a PC Terminal Emulator to Solve Problems 75
Ethernet Traffic
Counts
The normal frame counters indicate traffic between the VCN AP and user
PC. Some errored frame counters indicate fatal errors, requiring
replacement of the VCN AP, Ethernet cable or the user’s PC Network
Interface Card (NIC).
The following table depicts normal count indications of the Ethernet
traffic counters and probable causes for abnormal indications.
HDLC Traffic Counts
Normal frame counts indicate traffic between the VCN AP and the VCN
AC. Some errored frame counters indicate fatal errors, requiring
replacement of the VCN AP (failure between the analog front-end section
and the CPU section), or handling of environmental noise over the line.
Table 11 Ethernet Traffic Counters
Counter Counts the Frames Normal Count
Abnormal Count
Indicates
Tx frame Sent via the Ethernet
Port.
Increases as traffic is
generated
No data transmitted;
hardware problem:
■
VCN AP Tx channel
■
User Ethernet cable
■
No VCN AP
connection
Rx frame Received via the
Ethernet port.
Increases as traffic is
generated
No data received;
hardware problem:
■
VCN AP Rx channel
■
User Ethernet cable
■
No VCN AP
connection
Rx collision The VCN AP was
unable to receive
due to collisions on
the line
Zero or steady. For
non-zero count,
reset the counter
and wait a
reasonable period
of time to check for
no significant
increase.
VCN AP port hardware
failure.
CRC error,
overrun,
Alignment
error, frame
too long,
frame too
short
Containing receive
fatal errors.
Zero Hardware failure: VCN
AP, Ethernet cable or PC
NIC
