Verilink AS2000: The Basics (880-502981-001) Product Manual Uživatelský manuál stáhnout pdf (Strana 159)

Acronyms and Definitions

Verilink Access System 2000: Basics Glossary-39

PROM Programmable Read-Only Memory.

protocol The set of rules governing the

format, timing, sequencing, and

error control of exchanged

messages over a network or

between devices. Needed for data

transfer and communication

between two directly connected

organized units.

PSES P-bit Severely Errored Seconds. A

second during which a DS3 circuit

experiences 44 or more PCVs OR

one or more Out of Frame defects

OR a detected incoming AIS. The

PSES count does not increase when

UASs are counted.

public switched telephone network

(PSTN)

The public network operated by

carriers who provide leased lines

and packet-switched circuits so

users can connect customer site

equipment for data

communications. Sometimes

referred to as a private network.

PVC See

Permanent Virtual Circuit

(PVC)

PWR 2940 A power supply for use with a

Dual-line Shelf

(DLS). See

universal power supply (PWR

2940)

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Verilink AS2000: The Basics (880-502981-001) Product Manual Uživatelský manuál Strana 159