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
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