RAD Data comm TDMoIP Gateway IPmux-16 - Manual (Page 18)

Chapter 1 Introduction IPmux-16 Installation and Operation Manual
1-10 Functional Description
Table 1-1. 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.