RAD Data comm TDMoIP Gateway IPmux-16 - Manual (Page 17)

IPmux-16 Installation and Operation Manual Chapter 1 Introduction
Functional Description 1-9
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.
IPmux-16
E1/T1
E1/T1
IPmux-16
E1/T1
E1/T1
Adaptive Mode
Loopback Timing Mode
IPmux-16
E1/T1
E1/T1
Adaptive Mode
Master Clock
Source Device
Remote Loopback
Timing Devices
IP over
Ethernet
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
Note