User's Manual Part 2

170 APCD-LM043-8.0 (DRAFT C)
11: Monitoring the Network
From these statistics:
Total number of replies expected = A + B + D = 434,882
and the receive packet error rate which, as noted in Table 30, includes EUM receive errors
and errors associated with random access attempts, is given by
RxPER = (B + C + D) / (A + B + D) = (2,464 + 192 + 22,688) / 434,882 = 5.8%
One other receive statistic that is important in multi-CAP environments where frequency re-
use is implemented is
rxPktsNoMatch. A high value of rxPktsNoMatch indicates that the two
CCU radio environments are interfering with each other.
The statistic
rxPktsDuplicate measures the number of times the EUM sends the same packet
of information more than once. A high value of
rxPktsDuplicate indicates that the
acknowledgements from the CCU are not being properly received at the EUM.
11.3 Watch Statistics
CCU statistics monitor the aggregate traffic to all EUMs connected to that CCU. The CCU
“watch” command is available for monitoring a single EUM, which is a very useful tool for
troubleshooting individual links. These statistics have the same meaning as the “stats mac”
statistics of the same name, but apply to a single EUM, rather than all EUMs. This command is
described in detail in
CCU Watch Statistics on page 298.
B
rxPktsHCRCFail Packet received with a corrupted
header.
2,464
C
rxPktsFCS Fail Packet received from an EUM, with a
corrupted payload.
192
D
replyOrRssiTimeouts No reply or EUM HCRC errors and
missed packets. Does not include FCS
(frame check sequence) errors.
Note: This statistic also includes EUM
receive errors, by virtue of the fact that
if an EUM does not receive a poll from
the CCU, for any reason, then it will
not reply to the CCU.
22,688
Statistic Description Sample