Cisco AS5800 Specifications download pdf (Page 312)

Glossary

Cisco AS5800 Operations, Administration, Maintenance, and Provisioning Guide

DOC-7810814=

SONET

Synchronous Optical Network. Specification for a high-speed (up to 2.5 Gbps) synchronous network developed by Bellcore

and designed to run on optical fiber. STS-1 is the basic building block of SONET. See also STS-1.

STS-1

Synchronous Transport Signal level 1. Basic building block signal of SONET, operating at 51.84 Mbps. Faster SONET rates

are defined at STS-n, where n is a multiple of 51.84 Mbps. See also SONET.

STS-3c

Synchronous Transport Signal level 3, linked together. SONET format that specifies the frame structure for the 155.52-Mbps

lines used to carry ATM cells. See also SONET.

subnet mask

A 32-bit address mask used in IP to indicate the bits of an IP address that are used for the subnet address. Sometimes referred

to simply as a mask. See also IP address.

switching

The operations involved in interconnecting circuits in order to establish communications.

switching office (SO)

A telephone company office that contains a switch. Also known as Cenral Office (CO).

synchronous transmission

A method of sending information over a transmission line, and separating discrete characters and symbols by a precise

separation in time. Synchronous transmission offers higher throughput because it does not require the start-stop bits used by

asynchronous methods. Synchronous transmission is more expensive than other transmission methods.

Terminal Acess Controller Access Control System Plus (TACACS+)

A proprietary Cisco enhancement to Terminal Access Controller Access Control System (TACACS). Provides additional

support for authentication, authorization, and accounting. Authentication protocol that provides remote access authentication

and related services, such as event logging. User passwords are administered in a central database rather than in individual

routers, providing an easily-scalable network security solution.

T-1 (T-1) (T1)

Twenty-four (24) voice channels digitized at 64,000 bps, combined into a single 1. 544-Mbps digital stream (8000-bps

signaling), and carried over two pairs of regular copper telephone wires. Used primarily by telephone companies until 1983.

Now used for dedicated local access to long distance facilities, long-haul private lines, and for regular local service. Today,

most any 1.544 Mbps digital stream is called T-1, regardless of its makeup or transmission medium.

T-3 (T-3) (T3)

Digital WAN carrier facility. T3 transmits DS-3 formatted data or voice at 44.736 Mbps through the telephone switching

network using fiber optic cable.

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Cisco AS5800 Specifications Page 312