IPmux-1/1E Installation and Operation Manual Chapter 1 Introduction
Functional Description 1-17
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
N
ote: IEEE 802.1p&q VLAN
Tagging (additional 4 bytes if
enabled)
Note: The UDP source port
field is used to transfer the
destination bundle number in
static and dynamic CAS
modes.