RAD Data comm operation manual Frame Format, IPmux-16 in Adaptive Timing Mode

IPmux-16Installation and Operation Manual Chapter 1 Introduction

Note

Master Clock

Source Device

When there are several bundles from different sources at the same E1/T1 port, the bundle that will be used for adaptive clock regeneration for the port is the first bundle of every port. For example (E1): Bundle number 1 for port 1, bundle number 32 for port 2, bundle number 63 for port 3, bundle number 94 for port 4, etc.

In this mode the regenerated clock is subject to network Packet Delay Variation and may not comply with jitter and wander specifications.

			Adaptive Mode
				E1/T1
Loopback Timing Mode				E1/T1
E1/T1		IP over	IPmux-16
E1/T1		Ethernet			Remote Loopback
			Adaptive	Mode	Timing Devices
	IPmux-16
				E1/T1
				E1/T1
			IPmux-16

Figure 1-7. IPmux-16 in Adaptive Timing Mode

Frame Format

The Ethernet frame sent by the IPmux-16 is a UDP datagram which transfers E1/T1 payload bytes over IP over Ethernet (UDP payload + UDP header + IP header + Ethernet header).

The UDP payload size is equal to TDM bytes per frame (TDM bytes/frame configuration).

The illustration below specifies the structure of the different headers, special fields, and the payload in the Ethernet packet.

MAC

IP

UDP

Payload

Figure 1-8. TDMoIP Frame Structure

Functional Description 1-9