Specifications

Chapter 4 Troubleshooting and Diagnostics Installation and Operation Manual
4-8 Monitoring Performance MPW-1 MP-4100 Ver. 2.0
2. To display statistics for a selected previous 15-minute interval, select
Select Interval.
3. To display the total statistics for the current 24-hour interval, select Total
(24 hours).
You can clear the displayed statistics (that is, reset the monitoring counters) by
typing C: all the counters are simultaneously reset. The counters are also reset
when the MPW-1 is powered up.
Table 4-5 explains the pseudowire diagnostic (interval) statistics parameters.
Table 4-5. Pseudowire Diagnostic (Interval) Statistics Parameters
Parameter Description
PW Number Used to select the pseudowire with the desired index number.
Megaplex-4100 supports up to 640 pseudowires (the maximum number per MPW-1
is 128)
Slot Displays the I/O slot number, I/O-1 to I/O-10, of the MPW-1 module which
terminates the selected pseudowire
Name Displays the logistic name assigned to the selected pseudowire.
An empty string means that no name has been assigned to the selected pseudowire
Interval Number After selecting Select Interval, enter the number of the desired 15-minute interval
whose statistics you wish to display.
The allowed range is 1 to 96. The actual maximum depends on the number of
intervals for which valid data is available, which is displayed by the Valid Intervals.
Sequence Errors
Seconds
Displays the number of seconds during which sequence errors have been detected.
In accordance with the applicable standards, the transmitted packets carry a
sequence number that is automatically assigned, such that consecutive packets are
automatically consecutive sequence numbers. At the receive side, these numbers are
checked by the receive mechanism, which expects each new incoming packet to
carry the next number in the sequence, relative to the previous one (i.e., packet 5
must be received after packet 4). Any deviation from the this rule indicates a
problem with packet flow integrity (and hence with the pseudowire payload (data or
voice) integrity), and in this case the sequence errors count is incremented by 1.
There are two main reasons for a sequence error event:
• One or more packets have been lost somewhere in the network.
• Packets have been reordered within the network. Packet reordering may occur
due to queuing mechanisms, rerouting by the network, or when the router
updates include very large routing tables