Specifications

Chapter 1 Introduction IPmux-4 Installation and Operation Manual
1-10 Functional Description
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 1-9. TDMoIP Frame Structure
Table 1-2. Ethernet Frame Structure
Field length (bytes) Field
7 Preamble
1 SFD
6 Destination MAC Address
6 Source MAC Address
2 Type
1 Vers/HLEN
1 Service Type
2 Total Length
2 Identification
1 Flags/Fragment Offset (most)
1 Fragment Offset (least)
1 Time to Live
1 Protocol
2 Header Checksum
4 Source IP Address
4 Destination IP Address
2 UDP Source Port
2 UDP Destination Port
2 UDP Message Length
2 UDP Checksum
...
Payload
4 CRC
MAC
Layer
IP Layer
MAC
Layer
UDP
Layer
Data
Layer
LLC
Layer
IEEE 802.1p&q VLAN Tagging
(additional 4 bytes if enabled)
Note: The UDP source port
field is used to transfer a
destination bundle number.
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