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

System Controller Card. A single slot Compact PCI board which provides the central management functionality 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 defines 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 communication protocol. TCP (layer 4) does the actual transport of data; IP (layer 3) sets the rules for moving 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 connected 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 considered 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 connecting to boards inserted in the rear of the chassis.

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

P/N 480-0005-00-15

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