RAD Data comm Vmux-210 Specifications Page 30

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Chapter 1 Introduction Installation and Operation Manual
1-12 Functional Description Vmux-210 Ver. 1.1
Table 1-2. Ethernet Frame Fields (AAL2oMPLS Multiplexing)
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)
Data Layer ... Payload
MAC Layer 4 CRC
VLAN Support (per bundle)
Vmux-210 supports VLAN, according to IEEE 802.1D&Q. When VLAN support is
enabled, Vmux-210 adds four bytes to the MAC layer of the Ethernet frame. The
content of these bytes, MAC layer priority and VLAN ID, can be set by the user. In
this mode, only VLAN format frames are sent and received by Vmux-210. The
following figure describes the VLAN tag format.
802.1D Tag Protocol Type
(802.1QTagType)
81 00
user_priority
CFI = 0
VID
8654
1
8
1
Priority
VLAN ID
Figure 1-12. VLAN Tag Format
UDP Support
Table 1-3. UDP Source Port as Destination Voice Port
Field Length Field Description Value
2 bytes UDP Source Port* 2 – 497d
2 bytes UDP Destination Port 2142d
* – The MSB of this field can be either 1 or 0 for inband end-to-end proprietary
signaling.
The UDP Source Port field is used for destination voice bundle indication.
Note
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