Cisco Systems IPMUX-1E Reorder and Duplication of Ethernet Frames, Packet Delay in CESoIP Mode

IPmux-1/1EInstallation and Operation ManualChapter 1 Introduction

Round Trip Delay in Static Mode

(±2 ∝s) RTDelay(∝s) = 2 x [	47x n	x 125 ∝s + PDVT buffer ∝s +1000 ∝s] + network round trip delay
	NTS

•where n = TDMbytes/frame 48

•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(∝s) = 2 x [ 8000000payload + PDVT buffer ∝s +1000 ∝s] + network round trip delay

•where payload = number of active time slot bytes per frame (24 to 64)

Packet Delay in CESoIP Mode

RTDelay(∝s) = 2 x [packet delay+ PDVT buffer (∝s) +1000 ∝s] + 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: (jitterbuffer[msec] − 1)(Tsx8)

47xpayload

•where Ts = number of timeslots

•where payload = number of TDM bytes in frame, i.e. 1, 3, 5, 7, …, 29.

Note The maximum number of frames that can be reordered is seven, even if your calculation>7.

Functional Description 1-23