Cisco Systems IPMUX-1, IPMUX-1E Reorder and Duplication of Ethernet Frames

IPmux-1/1E Installation and Operation Manual Chapter 1 Introduction
Functional Description 1-23
Round Trip Delay in Static Mode
(±2 µs) RTDelay(µs) = 2 x [ NTS
n47x x 125 µs + PDVT buffer µs +1000 µs] + network round trip delay
• where n = 48
ebytes/framTDM
• where NTS = number of timeslots assigned; in unframed mode NTS is
constant: 32 for E1, 24 for T1
Round Trip Delay in Dynamic CAS Mode
RTDelay(µs) = 2 x [ payload
8000000+ PDVT buffer µs +1000 µs] + network round trip delay
• where payload = number of active time slot bytes per frame (24 to 64)
Packet Delay in CESoIP Mode
RTDelay(µs) = 2 x [packet delay+ PDVT buffer (µs) +1000 µs] + network round trip delay
• where packet delay is a configuration parameter
Reorder and Duplication of Ethernet Frames
IPmux-1/1E handles situations in the IP network where:
• Packets are reordered by the network
• Packets are duplicated.
Static Mode
Reordering Frames
The ability to correct problems of reordering is only supported for odd values of
payload, i.e. 1, 3, 5, 7, …, 29.
You can reorder up to seven frames; the number depends on the number of
TDM bytes/frame size and buffer size.
The number of frames that can be reordered is calculated by:
xpayload47
)8Tsx)(1sec]m[erjitterbuff(−
• where Ts = number of timeslots
• where payload = number of TDM bytes in frame, i.e. 1, 3, 5, 7, …, 29.
The maximum number of frames that can be reordered is seven, even if your
calculation>7.
Note