Verilink AS2000: The Basics (880-502981-001) Product Manual Uživatelský manuál stáhnout pdf (Strana 161)

Acronyms and Definitions

Verilink Access System 2000: Basics Glossary-41

RAI See

remote alarm indication

(RAI)

RAM See

random access memory

random access memory The primary memory of a

computer. Memory that can be

overwritten with new information.

read-only memory A memory device which can be

read only, not written to.

Receive data Information arriving at the local

site from the WAN.

red alarm A major alarm associated with the

complete loss of data. Three

conditions causing a red alarm are:

alarm indication signal (AIS)

loss of signal (LOS)

, or

loss of

frame (LOF)

. A device in red alarm

sends a

yellow alarm

toward the

net.

Channel Service

Unit (CSU)

storing performance

data parameters retrieved by an

ASCII terminal operator or the

Node Manager

. Each register can

be reset by an authorized operator

after data retrieval.

remote alarm bit Specific for E1 lines, bit 3 of

timeslot 0 (zero) in frames not

containing the frame alignment

signal. It indicates an alarm to the

remote end. A zero bit is normal

operation. A one bit is an alarm

condition.

remote alarm indication (RAI) See

yellow alarm

remote alarm indication seconds (RAIS) The number of seconds during

which a

Channel Service Unit

(CSU)

receives a

yellow alarm

The RAIS counts are stored by the

CSUs in AS2000 nodes.

remote alarm received Specific for E1 lines, a signal sent

to the near end to indicate that the

far end received an error

condition. (Similar to RAI in T1

lines.)

1 2 ... 156 157 158 159 160 161 162 163 164 165 166 ... 178 179

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