Johannesburg, 18 Jun 2004
In today's competitive telecommunications environment, extending capital budgets and lowering operating costs are often the keys to survival. Spescom Telecommunications is pleased to introduce RAD's Compressed Voice System (CVS), which can help utilise existing resources more efficiently by cutting recurring E1 costs by providing a high density voice compression system designed to work over both TDM and IP-based networks.
CVS uses powerful voice processing algorithms to compress a full E1 down to 128kbps, or 16 full E1 lines (480 concurrent voice channels) and associated signalling down to a single E1 circuit.
CVS allows carriers to provide high quality voice services at a small initial investment and low operating costs. CVS is also ideal in multi-site enterprise networks, remote call centres and other voice trunking applications.
RAD's CVS solution is led by the Vmux family of voice trunking gateways, which offers the highest density and compression ratios and the most advanced features and algorithms. Vmux employs Time Division Multiplexing over the Internet Protocol (TDMoIP) technology, which transparently extends E1 or E3 circuits across packetswitched IP/Ethernet/MPLS networks.
It is transparent to all protocols and signalling, and therefore supports legacy PBXs, including proprietary features. TDMoIP enables service providers to migrate to next-generation networks and continue to provide all their revenue-generating legacy voice and data services while minimising network maintenance and operating costs.
For applications that require network integration of voice, fax and modem traffic together with HDLC frame forwarding and Ethernet switching, the Vmux excels with highly efficient bandwidth management over IP, Ethernet or TDM networks. For applications that require a large number of analogue ports or a variety of data and voice interfaces, a similar solution can be supplied using RAD's Megaplex family.
Vmux with 16:1 compression is the most cost-effective solution on the market. The Vmux 2100 voice trunking gateway is a unique device that provides compressed voice transmission over both TDM and IP networks, and can easily switch between them whenever this may be advantageous, ensuring a migration path from TDM to IP networks. With its small footprint, easy installation and low power requirements, the 1U high Vmux-2100 voice trunking gateway offers the same number of ports as traditional 10U high compression platforms.
RAD's Vmux voice trunking gateway achieves 16:1 compression by combining industry standard technologies such as G.723.1, G.729A and G.711 compression algorithms, voice activity detection, silence suppression and comfort noise generation with RAD's unique TDMoIP aggregation and multiplexing protocol, which provides user configurable frame size and packetising intervals.
RAD's Vmux can further improve bandwidth utilization by compressing voice over the MPLS network. In fact, RAD was the first vendor to comply with the MPLS Forum's implementation agreement (IA) for voice trunking over the MPLS network, which enables the transfer of compressed voice over a converged MPLS backbone using existing ATM Adaptation Layer 2 (AAL2) technology (AAL2oMPLS). Compliance with the MPLS Forum's Voice Trunking Format IA also allows the Vmux to facilitate the migration process from ATM to MPLS.
A key feature of the Vmux-2100 gateway is its ability to handle multiple-hop networks. Voice loses some of its quality as it undergoes cycles of compression and decompression through multiple voice compression systems and telephone switches. RAD's Super Tandem feature ensures that voice quality is not compromised when calls are routed through several Vmux-2100 gateways. Intermediate Vmux-2100 units sense when a voice channel has already been compressed and do not recompress the data as it moves through the phone network.
Applications for compressed voice solutions include:
* General: PBX and LAN extension over wireless, satellite, E1/T1 or IP links (voice compression and improved voice communications between locations)
* International telecom providers: Wholesale and calling card services
* Large enterprises: Simple implementation of remote call centres
* Government and large enterprises: Disaster recovery and mobile contact centres
* Wireless operators: Voice/LAN services over wireless infrastructures
* National carriers: Rural telephony services over satellite
For more information please contact Spescom Telecommunications's product manager, Paul Serfontein, on (011) 266 1874.
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