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Vmux-2100 Installation and Operation Manual Chapter 1 Introduction
Functional Description 1-9
VLAN Support
Vmux-2100 supports VLAN, according to IEEE 802.1p&q. When VLAN support is
enabled Vmux-2100 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-2100. 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 1-8. VLAN Tag Format
UDP Support
Table 1-2. UDP Source Port as Destination Voice Port
Field Length (Bits) 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.
For example, if the destination is:
Bundle 1 – 02, Bundle 2 – 03, Bundle 3 – 04, Bundle 4 – 05, etc.
For more information about VLAN tagging, see IEEE Std 802.1 p&q.
Ethernet Main Link
10/100BaseT main link receives Ethernet frames from the voice modules via the
Ethernet switch and forwards them to the remote device over the IP network. The
10/100BaseT main link of Vmux-2100 supports full duplex transmission with
autonegotiation and half duplex with the backpressure option.
E1/T1 Main Link
When using E1/T1 main link, Vmux-2100 adds HDLC flags to the Ethernet frames
and transmits them over a TDM network. The E1/T1 main link interface of
Vmux-2100 is fully redundant. When both of links are configured as active,
Vmux-2100 starts sending data over the one that was connected first. If a loss of
synchronization is detected on an active link, Vmux-2100 automatically switches
to the backup link.
The E1/T1 links operate with loopback timing by deriving clock from the device
connected to its E1/T1 port or with internal clock provided by the Vmux-2100
internal oscillator.
Note