Vmux-210
Analog Voice Trunking Gateway
An integrated router supports IP routing,
Firewall, NAT, DHCP Server/Relay and
static routing. The IP routing can be
performed between the LAN network, LAN
user, and E1/T1/serial ports.
To transfer voice as well as 10/100 Mbps
Ethernet data over a serial uplink with a
small bandwidth (such as for satellite
applications), the ingress data rate on
both Ethernet ports can be limited to one
of several values between 128 kbps and
8 Mbps.
Vmux-210 provides +12/16 kHz pulse
metering and polarity reversal for call
center applications.
Vmux-210 is a compact, 1U high, 19-inch
wide unit that can be mounted in standard
19-inch racks.
IMPROVED BANDWIDTH UTILIZATION
Voice Activity Detection (VAD) and silence
suppression allow Vmux units to
dynamically allocate bandwidth for voice
traffic. This results in efficient bandwidth
usage, leaving more bandwidth for data
transport.
By preventing packets from being sent
when no voice activity is detected, the
VAD mechanism conserves bandwidth. The
improved bandwidth utilization enables
Vmux-210 to support a higher number of
channels than is possible by using
conventional voice compression methods
alone. By performing TDMoIP
R
multiplexing
and grouping the timeslots of G.723.1
compressed voice into bundles with a
common IP address, the actual link
bandwidth can be reduced to as low as
4 kbps per channel (a reduction of 16:1).
PRIORITY MECHANISM
Vmux-210 includes an internal mechanism
for identifying and providing priority for
packets containing voice, over those
containing other LAN traffic. This ensures
that voice packets are not delayed and a
high voice service quality is maintained.
QoS SUPPORT
The IP uplink complies with all relevant
Ethernet LAN standards, such as IEEE
802.3 and 802.3u. It provides reliable,
high Quality of Service (QoS), by optional
VLAN tagging and priority labeling
according to IEEE 802.1D&Q.
Assigned, IANA-registered UDP socket
number for TDMoIP
R
simplifies flow
classification through switches and
routers.
The user can configure the Type of Service
(ToS) of the outgoing IP packets. This
allows an en-route Layer 3 router or
switch, which supports ToS (or Diffserv),
to give higher priority to Vmux-210 IP
traffic for delay-sensitive applications.
VLAN TABLE
Vmux-210 includes a VLAN table,
containing up to 64 entries. Each entry
defines the egress and tagging policies for
packets with a specific VLAN ID, on each
port. Packets with a particular VLAN ID can
be blocked.
MANAGEMENT
All Vmux-210 operating parameters are
configured using simple, menu-based
software. For upgrades or backup,
software upload and download can be
performed via TFTP.
Vmux-210 can be configured and
monitored via a local ASCII terminal,
Telnet, or Web client. A DB-9 control port
is provided for local terminal connection
for monitoring and control.
For system security, Vmux-210 offers four
different user levels: Monitor, Technician,
Operator and Administrator. Up to 20
different usernames with passwords can
be defined.
Figure 1. Data and Compressed Digital/Analog Voice over IP Network
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