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`
`
`FIBER OPTICS
`
`STANDARD
`
`DICTIONARY
`
`THIRD EDITION
`
`

`

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`Wait. Mama 3.
`Fiberoptica standard dictionary I Maru'n H. Wait. - 3rd ed.
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`

`service termination point
`
`service termination point: 1. Proweding from a net-
`work toward a user terminal, the last point of service
`rendered by a commercial carrier, i.e. a common car-
`rier,under applicable tariffs Note I. The service termi-
`nation point usually is on the customer premises. it
`may be at the customer end of an electrical or a fiber
`optic loop. Note 2: The customer is responsible for
`equipment and operation from the service termination
`point to user end instruments. 2. In a switched commu-
`nications system, the point at which .common carrier
`service ends and user—provided servicebegins,1.e.. the
`interface point between the communications system
`equipment and the user terminal equipment, underap-
`plicable tariffs. See also common carrier, customer
`premises equipment, customer service unit, fiber op-
`tic loop, Interface, line—unit—llne terminatio'n, line—
`unit-network termination, medium access unit, net-
`Work, network Interface, network terminating
`interface, point, switched network,tariff, terminal,
`user, user end instrument.
`'
`
`-
`
`service time interval: In Communications system oper-
`ations, aperformance measurement period,or.a succes-
`sion of performance measurement periods, (a) during
`which- a communications service is scheduled to"per-
`form its annual finicn'on, (b) that includes Operational
`and outage periods, and (c) that is scheduled bythe
`calendar, such as 0600 to 2200 hours daily, cscept
`Sunday 1200 to 2200 hours. See also function, outage,
`outage period, performance measurement period,
`service, telecommunications sorvice.
`serviceunitrsee channel service unit, customer. ser-
`vice unit; data service unit.
`-
`
`' ”ar-
`
`service user: An individual or Organisation, including
`a. service vendor, that isprovided atelecommunicafions
`service for which a priority level has been requested
`or assigned.Seealso priority level, service, telecom-
`munications service.
`serving arrangement; See basic serving '
`range'ment.‘
`'
`'
`‘
`'
`:
`servomechanlsm: 1. An' automatic usuallyclean-ome-
`chanical device that uses feedback to controlthe spatial
`position of an element or part. Note. A fiber Optic
`device. such as a- fiber optic sensor {may be used to
`control the Servomechanism. thus converting an optical
`signal into a mechanical action. 2. A control device111
`which one or more of the internal or estetnal signals
`represent mechanical motion. Note: Examples ofservo-
`mechanisms are (a) a device that controls the precise
`positioning of an elevator at a floor, (b) an autopilot,
`and (c) an antenna position controller that masonizes
`the received signal level. See also fiber optic device,
`optical signal, signal, signal level.
`
`w-,
`warn-1:,
`
`.g'a".
`
`
`
`:71WTg—Kziffi‘*1’ai_'=i‘$l'"aim-nor.-.1-,_
`
`‘1”;
`
`session: In communications. connztutggsgamt;p
`ing, and control systems, (a) a‘ period
`
`
`
`
`
`between a control panel and a ship or f
`
`
`system controller to enable real timeo:
`
`the system or one of its subsystems. and,
`
`telephone call. See also call,. coon
`
`panel, fiber optic equipment, log-off,
`
`.
`period, remote access, remote man-ii
`
`‘ '' ‘.’-
`_
`telephone, terminal.
`'
`
`
`session layer: In open systems arclu _>
`
`that provides the functions and servi___
`
`
`elements of .a session (b) maintainall}
`
`quests and responses between the elemenlso ..
`
`and (c) laminate the session. See also .. .
`
`function, interconnection, layer, operi‘ ”
`
`tecture, open systems interconnection "
`
`tents »-Interconnectlon'—Referenoe. M;
`
`
`session. Refer to Fig. L-4.
`1)’
`Session layer: See Open Systems Inter
`Reference Model. Rder to Fig. 1.4.x
`
`
`
`set: 1. Any defined group of eotities",.usndll
`according to specified criteria, such as:(a)'all
`
`fibeis'm a fiber optic cable (b) all the links In;
`
`a trunk. or (c) all the protocols used in a’gi'
`'
`
`cations system. 2. A finite or infinite number
`'
`
`entities. or concepts that have a given prepay
`
`armies in common.3.1o_a specified c
`
`computer. data processing, or controleye m,m
`
`or part of system hardware, firmware,
`.
`
`into a specified state. See alphabetic
`1
`__
`
`character set, chlpset, coded characmrse
`
`ingcircuit multiplex set, four-wire te ‘_
`
`key set,numeric character set, noun-.11r
`‘
`
`actor so}, optical filter connector set,optical:
`
`set, radio set, telegraph set, television set, tum
`
`set, user set. See also entity, fiber optitip
`
`firmware, l1:
`optic link, fiber optic trunk,
`
`object, optical fiber, protocol, scholar-c,k,\
`
`settling time: In systems thatrequire chad"
`ill?
`cot frequenciessuch as (a) spread speeu‘
`
`shift keying systems and (b) wavelength-
`
`ber optic transmission systems, the time ‘
`
`the frequency of a multifrequency devicet
`..
`
`and stabilize at, a new operating fiequer‘t‘cjli-SHE;
`
`
`
`