Vmux-210 TDMoIP Voice Compression Gateway
Vmux-210 is a customer-located device that complements RAD’s larger modular Vmux-2100 system. It fulfills the need for remote
voice trunking gateway for both IP and leased line TDM networks, providing LAN and compressed voice services for a corporate
application which requires a large number of analog lines. The Vmux-210 voice interface includes 12, 15, 24, or 30 FXS analog ports
that connect to POTS or faxes. Vmux-210 compresses the voice traffic and transports it over a serial link, E1/T1 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. CAS is transparently transmitted end-to-end. A second 10/100BaseT port on the
Vmux-210 is provided for connecting a user Ethernet LAN to the unit. Together with Vmux-210’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 LAN network,
LAN user, and 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" wide unit that can be mounted in standard 19" racks.
Vmux-210 from RAD has 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™
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).
Vmux-210 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.
Vmux-210 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 802.1p&Q. 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‘s IP traffic for delay-sensitive applications. Assigned, IANA-registered UDP socket number for TDMoIP™
simplifies flow classification through switches and routers.
Vmux-210 VLAN table
Vmux-210 includes a VLAN table, which contains up to 64 entries. Each entry defines the egress and tagging policies for packets
with a specific VLAN ID, for each port. Packets with a particular VLAN ID can be blocked.
All Vmux-210 operating parameters are configured using a 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.
Vmux-210 data sheet
Vmux-210 Operations manual (pdf