RAD Data comm Vmux-210 Specifications Page 29

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Installation and Operation Manual Chapter 1 Introduction
Vmux-210 Ver. 1.1 Functional Description 1-11
When using the E1/T1/Serial main link, an additional 4 bytes are added to the
packet (HDLC framing).
Table 1-1. Ethernet Frame Fields
Layer Field Length
[bytes]
Field Note
7 Preamble
1 SFD
6 Destination MAC
Address
MAC Layer
6 Source MAC Address
LLC Layer 2 Type IEEE 802.1D&Q VLAN Tagging (additional
4 bytes if enabled)
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
IP Layer
4 Destination IP Address
2 UDP Source Port
The UDP source port field is used to transfer
a destination bundle number.
2 UDP Destination Port
Fixed value of 2142 (decimal). Assigned to
RAD by the IANA
2 UDP Message Length
UDP Layer
2 UDP Checksum
Data Layer
... Payload
MAC Layer 4 CRC
Note
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