Glossary - Cisco Prisma II Installation And Operation Manual

Glossary

A
ac, AC
alternating current. An electric current that reverses its direction at regularly recurring
intervals.
AGC
automatic gain control. A process or means by which gain is automatically adjusted in a
specified manner as a function of input level or other specified parameters.
C
CAN
cancel. The cancel character.
D
dc, DC
direct current. An electric current flowing in one direction only and substantially constant in
value.
DFB laser
distributed feedback laser. An injection laser diode that has a Bragg reflection grating in the
active region in order to suppress multiple longitudinal modes and enhance a single
longitudinal mode.
DRR
dual reverse receiver.
E
EDFA
erbium doped fiber amplifier. Optical fibers doped with the rare earth element, erbium,
which can amplify light in the 1550 nm region when pumped by an external light source.
EIA
Electronic Industries Association. A United States association that provides standards for use
between manufacturers and purchasers of electronic products.
EMC
electromagnetic compatibility. A measure of equipment tolerance to external electromagnetic
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