Subnet Mask. An IP address that determines how an IP address is divided into network and host portions ac- cording to the bits.

System Controller Card. A single slot Compact PCI board which provides the central management func- tionality for the Tenor CMS unit.

T1 WAN Card. A board inserted into the Tenor CMS to provide access to the network via T1 lines.

Tenor CMS. A Multi-Path gateway which digitizes voice/fax/modem data and transmits it over the IP through an Ethernet LAN, bypassing the public net- work.

TCP/IP. Transmission Control Protocol/Internet Proto- col. TCP/IP is a standard communications protocol divided into seven layers of activity. Each layer de- fines a different aspect of how two devices should talk to each other (i.e., when a network device should send/receive data). For example, layer one is the physical means of communications (e.g., modem), whereas layer 3 is the network type (e.g, Internet). For TCP/IP, it is a combination of two layers of com- munication protocol. TCP (layer 4) does the actual transport of data; IP (layer 3) sets the rules for mov- ing the data from one end of the network to another. TCP/IP uses an IP address to identify a location for specific network devices.

Transition Module. The RJ-48 ports on the rear of the E1, T1 or DS1 card used for connectivity to the network.

Trunk Group. A collection of T1 or E1 channels used to connect the Tenor CMS to the network or another piece of equipment.

W

WAN. Wide Area Network. A number of LANs connect- ed together through a long distance communications medium. For example, your company may have a LAN in New York, a LAN in Tokyo, and a LAN in Los Angeles. When these sites connect together over the data network or the public network, it is consid- ered a WAN. As a result, intra-corporate information is passed through the data network from one LAN to another LAN site in a remote location.

WAN cards. Boards inserted in the chassis front slots (E1, T1 or DS1) to provide intelligent processing for accessing the network via T1 or E1 spans and con- necting to boards inserted in the rear of the chassis.

Zone. A group of endpoints (e.g, gateways, terminals, etc.) in one corporate site.

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