Voice Trunking Gateway
Vmu
-110
Figure 1. Data and Compressed Digital/Analog Voice over IP Network
DESCRIPTION
• Vmux-110 is a customer-located
device that complements RAD’s
larger modular Vmux-2100
system. It fulfills the need for a
low capacity remote voice
trunking gateway for both IP and
leased line TDM networks.
Vmux-110 is available with a
choice of voice channels.
• The voice interface includes one
of the following:
One E1 or T1 port, which
receives E1 or T1 trunks from
PBXs
Four or eight FXS/FXO/E&M
analog ports that connect to
POTS or faxes.
• Vmux-110 compresses the voice
traffic and transports it over either
a serial TDM link, or a
10/100BaseT IP link. The device
employs G.723.1, G.729 Annex A
and G.711 compression
algorithms together with RAD’s
unique TDMoIP
®
multiplexing,
including transparent CAS and
CCS.
• A second 10/100BaseT port is
provided for connecting a user
Ethernet LAN to the unit.
Together with Vmux-110’s integral
Ethernet switch, this allows
integrating the user LAN traffic
with the compressed voice, over a
single uplink (IP or serial) to the
network.
• An integrated router supports IP
routing, Firewall, NAT, DHCP
Server/Relay and static routing.
The IP routing can be performed
between the network, user, and
serial ports.
• To transfer voice as well as
10/100 Mbps Ethernet data over a
TDM 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 2 Mbps.
• For deployment optimization,
Vmux-110 with E1 or T1 voice
ports can be ordered to
compress 6, 12, 18, 24 (for full T1
trunk) or 30 timeslots (for full E1
trunk). Each timeslot carries a
single digital voice channel.
• Vmux-110 is a compact, 1U high,
1/2 19" wide unit that can be
mounted in standard 19" 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-110 to support a
higher number of channels than is
possible by using conventional
voice compression methods
alone. By performing TDMoIP
®
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).
APPLICATIONS
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