Voice Compression
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VMUX-110

Features

• Supports bandwidth efficient transmission of one E1, T1 or (4) FXS ports over IP or a single fractional TDM link.

• Simultaneous transmission over IP and TDM networks

• Unique TDMoIP Multiplexing, together with various voice compression algorithms, provides up to 16:1 effective bandwidth utilization 

• Bandwidth is dynamically allocated according to Voice Activity Detection and silence suppression

• G.168 Echo Cancellation of up to 16 msec per channel

• Group III Fax relay support, at rates of 2.4 to 14.4 kbps

• Transparent modem support for all common rates and standards

• QoS support:

  • Labeling IP level priority (ToS)

  • VLAN tagging and priority labeling according to IEEE 802.1p&q

• Supports HDLC Channel Compression

• DTMF/MFR2/MFC signal detection, generation and relay

• Signaling supported:

  • Transparent CAS signaling, including R2 and E&M

  • Transparent CCS signaling, including ISDN, QSIG and SS7

• Management via user terminal, secured SNMP and Telnet

• Enhanced local and remote diagnostics tools

• Compact 1U-high platform, compatible with 19" racks

Description

Vmux-110 is a customer-located device that complements the
larger modular Vmux-2100 system, fulfilling the need for a
low capacity remote voice trunking gateway for both IP and
leased line TDM networks.

Vmux-110 is available with either an E1 or T1 port for digital voice channels, or four FXS ports for analog POTS. 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 signaling. 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.

Voice Activity Detection (VAD) and silence suppression allow Vmux units to dynamically allocate bandwidth for voice traffic. This results in very 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 together into bundles with a common IP address, actual link bandwidth used can be reduced to as low as 4 kbps per channel (a reduction of 16:1). CAS and CCS signaling are transparently transmitted end-to-end. Vmux-110 transmits HDLC-based CCS signaling protocols such as SS7, ISDN and QSIG as HDLC over IP. HDLC frames are removed, and any signal payload is sent in an IP packet. For ISDN and QSIG protocols, this results in significant bandwidth savings.

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, half 19" wide unit that can be mounted in standard 19" racks.