Specifications

Installation and Operation Manual Chapter 6 Troubleshooting and Diagnostics
Vmux-210 Ver. 1.1 Monitoring Performance 6-5
The 'Tracing Window' is 30 packets deep. Missing packets and duplicated packets
will be recognized correctly only if their Seq_Num is within this trace window.
For example, if a received sequence is 96,97,98,99,100,75... then packet no. 75
is recognized as a duplicate (100 - 75 < 30 = inside the window) and freed, so
now the card expects packet no.101 to arrive from the network. However, if the
received sequence is 96,97,98,99,100,65... then packet no.65 is not recognized
as a duplicate and is accepted, (100- 65 > 30 = outside the window). Now the
card expects packet no.66 to arrive, and if packet no. 101 arrives instead, then a
Longest Burst of 35 will be detected.
 To display packet tracking:
1. From the Main Menu, select Monitoring > Statistics > Bundles.
The Bundles Statistics menu appears (see
Figure 6-2 ).
2. From the Bundles Statistics menu, select a Bundle Number, and then select
Display Packets Tracking.
The Display Packets Tracking screen appears (see
Figure 6-4 ).
3. Press <Enter> to refresh the display.
4. Press ‘C’ to clear the statistics.
5. Press <Esc> to exit the Bundle Statistics screen.
Bundle: 1. State: DISCONNECT
Num of Freed Packets ... (0)
Num of Missing Packets ... (0)
Longest Series of Missing Packets ... (0)
Num of Series With 1 Missing Packet ... (0)
Num of Series With 2 Missing Packets ... (0)
Num of Series With 3 Missing Packets ... (0)
Num of Series With 4 Missing Packets ... (0)
Num of Series With 5 Missing Packets ... (0)
Num of Series With more than 5 Missing Packets ... (0)
Figure 6-4. Packets Tracking
Table 6-2. Packets Tracking
Field Description
Num of Freed Packets Number of duplicate packets that were received and dropped (indicates
duplicate problem in the network or packet reordering)
Num of Missing Packets Number of packets that did not arrive in time according to sequence number
(either lost in the network or reordered)
Longest Series of Missing
Packets
Largest series of consecutively numbered missed packets (a large value
indicates a bursty problem in the network)