Instruction manual

MERLIN LEGEND Communications System Release 5.0

Maintenance and Troubleshooting

555-650-140

Issue 1

June 1997

Glossary

Page GL-19

Flash ROM Beginning with Release 3.0, a type of read-only

memory provided on the processor module, used

to supply system features.

foil shield Copper foil sheet (for power units) used to prevent

excessive noise on the module.

forced idle Condition of the system during certain programming

or maintenance procedures; system prevents initia-

tion of new calls.

foreign exchange

See

FX.

frame One of several segments of an analog or digital sig-

nal that has a repetitive characteristic. For example,

DS1

frame consists of a framing bit and 24 bytes,

which equals 193 bits.

framing format Pattern of frames used in transmissions.

frequency

generator

See ring generator

FRL (Facility Restriction Level) ARS calling restriction

type that restricts outgoing calls to certain specified

routes.

FX (foreign exchange) Central office (CO) other than the

one that is providing local access to the public tele-

phone network.