RAD - T

T1 - A digital transmission link with a capacity of 1.544 Mbps used in North America. Typically channelized into 24 DS0s, each capable of carrying a single voice conversation or data stream. Uses two pairs of twisted pair wires.

T1 MLPPP (Multilink Point-to-Point Protocol) - Combining (bonding) multiple PPP (Point-to-Point Protocol) links between two systems into one logical data pipe. MLPPP is a standard IETF protocol.

TDMoIP® - TDM over IP is a standards-based transport technology that extends voice, video or data circuits across packet-switched networks simply, transparently and economically. Acting as a pseudowire, TDMoIP is unique in that it supports the multiple signaling standards, OAM mechanisms and clock recovery features demanded by TDM networks for carrying voice-grade telephony channels. A simple alternative to VoIP, TDMoIP enables using legacy TDM equipment while facilitating a smooth migration to newer IP, Ethernet and MPLS networks. TDMoIP technology was developed and patented by RAD, and is found in RAD’s IPmux, Vmux and Megaplex products.

UBR (Undefined Bit Rate) - An economical best-effort class of service, without a guaranteed performance level.

UMTS- UMTS (Universal Mobile Telecommunications System) is a 3G mobile technology using W-CDMA (Wideband Code Division Multiple Access) air interface. Developed to support voice and broadband services, such as video telephony and video conferencing, UMTS offers data rates of up to 2 Mbps, compared to the 64 kbps bandwidth supported by 2G networks.

UNI (User Network Interface) - The interface, defined as a set of protocols and traffic characteristics, between the CPE and the ATM network.

VBR (Variable Bit Rate) - Traffic containing bursts but centered around an average bandwidth. VBR, divided into real-time (RT-VBR) and non-realtime (NRT-VBR) traffic, requires the same service guarantees (that is delay, cell loss and timing) provided by CBR.

Voice Compression - Newer voice compression algorithms try to model 64 kpbs PCM (G.711) more efficiently using fewer bits to reduce the bandwidth required, while preserving the quality or audibility of the voice transmission. Vendors such as RAD support low bit rate voice compression algorithms such as ITU G.723.1 and G.729A to permit the greatest number of simultaneous multiple calls while maintaining high quality voice. In this way, compressed voice systems (CVS) can offer greater bandwidth savings, reduced network congestion and high quality voice transmissions.

VoIP (Voice over IP) - Set of facilities for managing the delivery of voice information using the Internet Protocol (IP). Voice information is sent in digital form in discrete packets over the Internet instead of in analog form over the public switched telephone network (PSTN). A major advantage of VoIP is that it avoids the tolls charged by ordinary telephone service.

WAN (Wide Area Network) - A network that typically spans nationwide distances and usually utilizes public telephone networks.

WDM (Wave Division Multiplexing) - Optical transmission technique in which two or more wavelengths (each carrying its own information) are combined for transmission over a single optical fiber. At the receiving end, the wavelengths are separated and directed to separate receivers. Increases the capacity of data transmission over fiber optics. Also used to connect two fiber optic devices over a single strand of fiber.

Wireless Backhaul - The infrastructure and technologies connecting wireless base stations and Node Bs to base station controllers and radio network controllers, respectively, as well as the links between the controllers and the core network.

Wireless Modem - A modem that uses radio transmission technology to transmit data between remote locations. A wireless modem is often used by mobile clients in locations where access to a terrestrial connection is not feasible.