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Chapter 1 Introduction Vmux-2100 Installation and Operation Manual
1-8 Functional Description
Ethernet Frame
At a later stage, the TDMoIP frame becomes a part of the standard Ethernet frame,
which also includes a UDP header, IP header and MAC. The Ethernet frames are
forwarded to the Ethernet switch, which sends them to one of the main links:
10/100BaseT or E1/T1. Figure 1-7 illustrates the structure of the Vmux-2100
Ethernet frame. Table 1-1 describes the fields of the Vmux-2100 Ethernet frame.
Voice Voice VoiceEthernet Ethernet
IP
UDP TDMoIP
AAL2 AAL2 AAL2
Figure 1-7. Ethernet Frame Structure
Table 1-1. Ethernet Frame Fields
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.