RAD Data comm IPmux-11 operation manual Bundle Connection Parameters, Parameter Description

Chapter 6 Troubleshooting and Diagnostics Installation and Operation Manual

Table 6-2. Bundle Connection Parameters

Parameter Description

Sequence Errors

The number of seconds with at least one sequence error since the last clear.

Each packet transmitted by IPmux-11 holds a sequence number. The receiving IPmux-11 checks these numbers at the receive mechanism and expects to see that each new incoming packet is “in sequence” relative to the previous one (i.e., packet no. 5 is received after no. 4). When, for some reason, this is not the case (i.e., next packet is not in sequence relative to the previous one), this means that there had been a problem with packet flow integrity (and hence data/voice integrity). IPmux will indicate this by increasing the “Sequence Errors” counter by one.

There may be two reasons for a Sequence Error notification: Packet or packets are lost somewhere along the network.

Re-ordering of packets by network.

Packet re-ordering may occur due to queuing mechanisms, re-routing by the network, or when the router updates very large routing tables.

Recommendations:

•Make sure IPmux-11 traffic has sufficient bandwidth. See Chapter 1 for throughput calculation.

•Make sure Ethernet connection is functioning properly. (See Displaying LAN Statistics on page 6-5.)

•Make sure Ethernet/IP network provides priority (Quality Of Service) to the IPmux traffic. Priority may be achieved by three means: VLAN tagging, IP TOS marking or by using the constant 2142 decimal value at the “UDP destination Port” field of each TDMoIP packet.

•Verify that the IP network devices (switches/routers/modems/etc.) are capable of handling the IPmux PPS rate (Packets Per Second).

•Make sure the network devices do not drop/lose/ignore packets.

Note: IPmux-11 may support a “reordering mechanism”, which can sort packets back to their original order in some situations.

6-8 Monitoring Performance IPmux-11 Ver. 2.00