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20614 Cisco Installing and Maintaining Routers Part 4: 12000 GSR Series and XS5032 Modules

SONET

Synchronous Optical Network, a standard for connecting fiber−optic transmission systems.

Static Random−Access Memory (SRAM)

Type of RAM that retains its contents for as long as power is supplied. SRAM does not require constant

refreshing, like DRAM.

STM

Synchronous Transport Module

Synchronous Optical Network (SONET)

Synchronous Optical Network. High−speed (up to 2.5 Gbps) synchronous network specification developed by

Bellcore and designed to run on optical fiber. STS−1 is the basic building block of SONET. Approved as an

international standard in 1988.

telco

abbreviation for telephone company

Token Ring

this term is always used in capitals when referring to Token Ring networks etc.

transceiver

short for transmitter−receiver − a device that both transmits and receives analog or digital signals.

Trivial File Transfer Protocol (TFTP)

Trivial File Transfer Protocol. Simplified version of FTP that allows files to be transferred from one computer

to another over a network.

UPS

uninterruptible power supply

UTP

Unshielded Twisted−Pair

VAC

volts alternating current

VDC

volts direct current