408 lines
14 KiB
Plaintext
408 lines
14 KiB
Plaintext
===============================================================================
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_ _ _______
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_________/ /
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/__________/
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(314)432-0756
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Proudly Presents
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The MCI Telecommunications Glossary
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Part I Volume III (O - S)
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Typed and edited by Knight Lightning
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===============================================================================
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- O -
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OFFERED TRAFFIC The number of call attempts in any
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specified period of time.
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OFF HOOK The condition which which results when a
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telephone handset is lifted from its
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mounting, allowing the hookswitch to
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operate.
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OFF NETWORK ACCESS LINE (ONAL) A connection from a private switched
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service or transmission network
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accessing the public switched network.
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OFF NETWORK CALLING Telephone calls through a private
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switching system and transmission
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network which extend to the public
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telephone system.
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OFF PREMISES EXTENSION (OPX) An extension telephone or keyset that is
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geographically separated from its
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associated PBX.
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ON HOOK The condition which results when a
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telephone handset is placed on its
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mounting, which causes the hook-switch
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to open up its contacts.
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ON NETWORK CALLING A term used to describe a call that
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originates and terminates on private
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network.
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OPERATOR ASSISTED CALLS Non-DDD calls requiring manual
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intervention.
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OTHER COMMON CARRIER (OCC) A company which provides long distance
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telephone services, other than AT&T.
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OUT-OF-BAND Any frequency outside the band used for
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voice frequencies.
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OUT-OF-BAND SIGNALING Use of a narrow band filters to place
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the voice signal on a carrier channel
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below 3,400 CPS, reserving the 3,400 -
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3,700 CPS band for supervisory signals.
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OVERBUILD Adding radio capacity to a
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telecommunications network.
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OVERFLOW Switching equipment which operates when
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the traffic load exceeds the capacity of
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the regular equipment.
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- P -
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PAD A non-adjustable resistance network used
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to insert transmission loss into a
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circuit.
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PHASE JITTER (See JITTER.)
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POINT-TO-POINT A communications circuit between two
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terminations which does not connect with
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a public telephone system.
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POLLING A progress by which a computer
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interrogates the "readiness to transmit"
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status outlying terminals.
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PORT (See COMPUTER PORT.)
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POSTAL TELEPHONE AND TELEGRAPH (PTT) Foreign government agencies responsible
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for regulating communications.
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PRIMARY AREA A customer"s local telephone calling
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area.
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PRIMARY ROUTING POINT The switch designated as the control
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point for a longhaul telephone call.
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PRIVATE AUTOMATIC BRANCH EXCHANGE/ A switching system that provides
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PRIVATE BRANCH EXCHANGE (PABX/PBX) intermal telephone communications
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between stations located on a customer's
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premises as well as between these
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stations and public or private telephone
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networks.
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PRIVATE LINE A dedicated communications path for use
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between specific points.
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PRIVATE LINE SERVICE Subscribers have dedicated, usually
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full-time communications facilities.
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Services can range from standard
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communications lines to highly
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sophisticated unique arrangements
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tailored to a customer need. Channels
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may be established between two points,
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(e.g., tie together several customer
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PABX's linking various locations.)
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Subscribers may elect to purchase
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transmission facilities and create
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their own privately owned network.
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PRIVATE USE NETWORK Two or more private line channels
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contracted for by a customer and
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restricted for use by the customer only.
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PROGRAMMABLE READ ONLY MEMORY (PROM) Memory which is electrically programmed
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by the equipment manufacturer into a
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computer and can only be changed with
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special equipment which erases the
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previous program. Unaffected by power
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loss.
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PROGRAMMED SPEED DIALING Synonym: Abbreviated Dialing.
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PUBLIC SWITCHED NETWORK (PSN) The nationwide network maintained by AT&T
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AT&T and the indepenz{t telephone
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companies which provide nationwide,
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unrestricted telephone service.
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PUBLIC UTILITY COMMISION (PUC)/ The state commisions regulating
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PUBLIC SERVICE COMMISION (PSC) intrastate communications.
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PULSE-LINK REPEATER Connects one E&M signaling circuit
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directly to another.
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PUSH BUTTON DIALING Synonym: Dual Tone Multi-Frequency.
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- Q -
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QUEUE A temporary delay in providing service
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caused by the inability of the system
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provided to handle the number of
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messages or calls attempted.
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- R -
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RADIO COMMON CARRIER (RCC) A communications common carrier that
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provides radio paging and mobile
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telephone services to the public.
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RANDAM ACCESS MEMORY (RAM) That portion of a computer's memory
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which can be accessed non-sequentially
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and, therefore, is considered the
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"working memory."
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RATE CENTER A specified geographic location used by
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the telephone company to determine
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interchange mileage for rate determina-
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tion purposes.
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READ ONLY MEMORY (ROM) That portion of a computer's memory
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which is programmed electrically by the
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manufacturer, is unchangeable, and is
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unaffected by a power loss.
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REDUNDANCY Duplicate equipment that is provided to
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minimize the effect of failures or
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equipment breakdowns.
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REGENERATION The process of recieving distorted
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signal pulses and from them recreating
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new pulses at the correct repitition
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rate, pulse amplitude, and pulse width.
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REGIONAL OPERATING COMPANY (ROC) There are currently 7 ROC's which own 22
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BOC's.
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REMOTE ACCESS The ability of transmission points to
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gain access to a computer which is at a
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different location.
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REPEATER An electronic device used to amplify
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signals which have become too weak.
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REPEATING COIL The telephone industry's term for a
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voice-frequency transformer.
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RESELLER A business which buys services from one
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business at a bulk rate and sells
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portions of those services to multiple
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users.
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RESTORATION The re-establishment of service by
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rerouting, substitution of component
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parts, or as otherwise determined.
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RETARD COIL A coil having a large inductance which
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retards sudden changes of the current
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flowing through its winding.
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RINGBACK TONE Synonym: Audible Ringing Tone.
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RINGDOWN A circuit or a method of signaling where
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the incoming signal is actuated by
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alternating current over the circuit.
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ROTARY DIAL A rotary mechanism having a ten-hole
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finger wheel which when wound up and
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released causes pulsing contacts to
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interrupt the line current and operate
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the central office selecting equipment
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in accordance with the digit dialed.
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ROUTE GUIDE A map showing how a customer's calls are
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routed.
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ROUTE OPTIMIZATION Synonym: Least Cost Routing.
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ROTARY HUNT An arrangement which allows calls placed
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to seek out an ideal circuit in a pre-
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arranged multi-circuit group and find
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the next open line to establish a
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through circuit.
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- S -
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SATELLITE COMMUNICATIONS A vehicle in geosynchronous orbit with
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the Earth which contains a source of
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energy, such as solar cells, and
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amplifies the signals it recieves
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before transmitting it back to Earth.
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SECONDARY CARRIER Customer can override their primary
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carrier selection on a call by call
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basis and select other IC's to carry
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their long distance traffic in equal
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access areas.
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SELECTIVE CALLING The ability of a transmitting station to
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specify by the use of assigned codes
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which of several stations is to receive
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a message.
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SERVICE A group of circuits which terminate at
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the same location and provide the same
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capabilities.
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SERVICE AND EQUIPMENT RECORD A list of equipment billed to customer
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by type, quantity, monthly charge,
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location, and billing dates.
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SF SIGNALING (SINGLE-FREQUENCY) A signaling system which uses a 2,600 Hz
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in-band signal on the voice path. The
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tone is on in the idle condition, pulsed
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for dialing, and off when the circuits
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is in use.
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SHORT HAUL Curcuits designated for use over
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distances of 10 - 200 miles.
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SIGNALING A procedure for indicating to the
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receiving end of a communications
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circuit that data is to be transmitted.
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SIGNALING CONVERTER A device with input and output signals
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that contain the same information but
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employ different electrical systems for
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transmitting that information.
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SIGNALING, IN-BAND A type of signaling using an AC signal
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(usually a 2,600 Hz) within the normal
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voice band. This signal can be trans-
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mitted from and end to end of a long
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voice circuit without any intermediate
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signaling equipment. Since the signaling
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is audibile, the signaling equipment
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must be arranged for "tone on when idle"
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operation.
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SIMPLEX (SX) SIGNALING A signaling path over a dry talking
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circuit which uses the two sides of the
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circuit in parallel, derived by
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connecting the midpoints of repeating
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coils or retardation coils which are
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across the circuit.
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SINGLE SIDEBAND RADIO (SSB) A form of amplitude modulation of a
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radio signal in which only one of the
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two sidebands is transmitted. Either of
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the two sidebands may be transmitted,
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and the carrier may be transmitted,
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reduced or suppressed.
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SINGING A continued whistle or howl in an
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amplified telephone circuit. It occurs
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when the sum of the repeater gain
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exceeds the sum of the circuit losses.
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SOFTWARE (1) Any of the routines, programs, and
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instructions required to use computers.
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(2) A written statement of the
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procedures to be used and the format of
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the data at every step.
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SPECIAL GRADE NETWORK TRUNK A trunk specially conditioned by
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providing amplitudeand delay
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equalization for the purpose of handling
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special services such as medium-speed
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data (600 to 2400 BPS).
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SPECIALIZED COMMON CARRIER A new type of common carrier specializing
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specializing in providing transmission
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facilities.(e.g., Microwave
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Communication Inc.(MCI), Southern
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Pacific Communication Co.(SPC), and the
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satelite communication companies like
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Satellite Business System (SBS).)
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SPEED NUMBER A one, three, or four digit number that
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replaces a seven or ten digit telephone
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number. These numbers are programmed
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directly into the switch.
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STATION Any customer location on a network
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capable of sending or receiving messages
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or calls.
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STATION MESSAGE DETAIL RECORDING A computer generated report showing
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(SMDR) internal usage on a telephone system.
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Usually including extension number,
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trunk number used, phone number dialed,
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time of call, duration and operator
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involvement.
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STORE-AND-FORWARD A technique in which a message is
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recieved from the originator and held in
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becomes available.
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STORED POGRAM CONTROL (SPC) A system whereby the instructions are
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placed in the memory of a common-
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controlled switching unit and to which
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it refers while processing a call for
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instructions regarding class marks, code
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trouble analysis.
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SUPERGROUP (SG) 60 circuits processed as a unit in a
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carrier system.
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SUPERMASTERGROUP (SMG) 600 circuits processed as a unit in a
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carrier system.
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SUPERVISION Synonym: Answer Supervision.
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SUPERVISORY SIGNALS A signal, such as a "on-hook" or
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"off-hook," which indicates whether a
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circuit or line is in use.
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SWITCH Equipment used to interconnect lines and
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trunks.
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SWITCH HOOK Synonym: Hookswitch.
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SWITCHING The operations involved in
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interconnecting circuits in order to
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establish communications.
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SWITCHING CENTER A location at which telephone traffic,
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either local or toll, is switched or
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connected from one circuit or line to
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another.
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SWITCHING OFFICE A telephone company office which
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contains a switch.
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===============================================================================
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This concludes Part I Volume III of the MCI Telecommunications Glossary. Look
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for more G-philes from on MCI by Knight Lightning coming soon to Metal Shop.
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This has been a 2600 Club production
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Thanx to Taran King
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Call The Works BBS - 1600+ Textfiles! - [914]/238-8195 - 300/1200 - Always Open
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