Sec.  36.641   Transition.

   (a) The expense adjustment for 1993 and subsequent years shall be the amount
   computed in accordance with  Sec. 36.631.

   (b) The expense adjustments for 1988 through 1992 shall be as follows:

   (1) Three-eighths of the amount computed in accordance with  Sec. 36.631 in 1988;

   (2) One-half of the amount computed in accordance with  Sec. 36.631 in 1989;

   (3) Five-eighths of the amount computed in accordance with  Sec. 36.631 in 1990;

   (4) Three-quarters of the amount computed in accordance with  Sec. 36.631 in
   1991; and

   (5) Seven-eighths of the amount computed in accordance with  Sec. 36.631 in 1992.

Subpart G [Reserved]

Appendix to Part 36—Glossary

   The descriptions of terms in this glossary are broad and have been prepared
   to assist in understanding the use of such terms in the separation
   procedures. Terms which are defined in the text of this part are not
   included in this glossary.

   Access Line

   A communications facility extending from a customer's premises to a serving
   central office comprising a subscriber line and, if necessary, a trunk
   facility, e.g., a WATS access line, TWX access line.

   Book Cost

   The cost of property as recorded on the books of a company.

   Cable Fill Factor

   The ratio of cable conductor or cable pair kilometers in use to total cable
   conductor or cable pair kilometers available in the plant, e.g., the ratio
   of revenue producing cable pair kilometers in use to total cable pair
   kilometers in plant.

   Category

   A grouping of items of property or expense to facilitate the apportionment
   of their costs among the operations and to which, ordinarily, a common
   measure of use is applicable.

   Central Office

   A switching unit, in a telephone system which provides service to the
   general public, having the necessary equipment and operations arrangements
   for terminating and interconnecting subscriber lines and trunks or trunks
   only. There may be more than one central office in a building.

   Channel

   An electrical path suitable for the transmission of communications between
   two or more points, ordinarily between two or more stations or between
   channel terminations in Telecommunication Company central offices. A channel
   may be furnished by wire, fiberoptics, radio or a combination thereof.

   Circuit

   A fully operative communications path established in the normal circuit
   layout and currently used for message, WATS access, TWX, or private line
   services.

   Circuit Kilometers 

   The route kilometers or revenue producing circuits in service, determined by
   measuring the length in terms of kilometers, of the actual path followed by
   the transmission medium.

   Common Channel Network Signaling

   Channels between switching offices used to transmit signaling information
   independent of the subscribers' communication paths or transmission
   channels.

   Complement (of cable)

   A group of conductors of the same general type (e.g., quadded, paired)
   within a single cable sheath.

   Complex

   All groups of operator positions, wherever located, associated with the same
   call distribution and/or stored program control unit.

   Concentrating Unit (TWX)

   An arrangement of central office equipment wherein traffic over a number of
   TWX circuits is automatically concentrated onto a lesser number of circuits
   between the concentrating unit and its associated TWX switching office.

   Concentration Equipment

   Central office equipment whose function is to concentrate traffic from
   subscriber lines onto a lesser number of circuits between the remotely
   located concentration equipment and the serving central office concentration
   equipment. This concentration equipment is connected to the serving central
   office line equipment.

   Connection—Minute

   The product of (a) the number of messages and, (b) the average minutes of
   connection per message.

   Conversation—Minute

   The product of (a) the number of messages and, (b) the average minutes of
   conversation per message.

   Conversation-Minute-Kilometers 

   The product of (a) the number of messages, (b) the average minutes of
   conversation per message and (c) the average route kilometers of circuits
   involved.

   Cost

   The cost of property owned by the Telephone Company whose property is to be
   apportioned among the operations. This term applies either to property costs
   recorded on the books of the company or property costs determined by other
   evaluation methods.

   Current Billing

   The combined amount of charges billed, excluding arrears.

   Customer Dialed Charge Traffic

   Traffic which is both (a) handled to completion through pulses generated by
   the customer and (b) for which either a message unit change, bulk charge or
   message toll charge is except for that traffic recorded by means of message
   registers.

   Customer Premises Equipment

   Items of telecommunications terminal equipment in Accounts 2310 referred to
   as CPE in  Sec. 64.702 of the Federal Communication Commission's Rules adopted in
   the Second Computer Inquiry such as telephone instruments, data sets,
   dialers and other supplemental equipment, and PBX's which are provided by
   common carriers and located on customer premises and inventory included in
   these accounts to be used for such purposes. Excluded from this
   classification are similar items of equipment located on telephone company
   premises and used by the company in the normal course of business as well as
   over voltage protection equipment, customer premises wiring, coin operated
   public or pay telephones, multiplexing equipment to deliver multiple
   channels to the customer, mobile radio equipment and transmit earth
   stations.

   Customer Premises Wire

   The segment of wiring from the customer's side of the protector to the
   customer premises equipment.

   DSA Board

   A local dial office switchboard at which are handled assistance calls,
   intercepted calls and calls from miscellaneous lines and trunks. It may also
   be employed for handling certain toll calls.

   DSB Board

   A switchboard of a dial system for completing incoming calls received from
   manual offices.

   Data Processing Equipment

   Office equipment such as that using punched cards, punched tape, magnetic or
   other comparable storage media as an operating vehicle for recording and
   processing information. Includes mechines for transcribing raw data into
   punched cards, etc., but does not include such items as key-operated,
   manually or electrically driven adding, calculating, bookkeeping or billing
   machines, typewriters or similar equipment.

   Dial Switching Equipment

   Switching equipment actuated by electrical impulses generated by a dial or
   key pulsing arrangement.

   Equal Access Costs

   Include only initial incremental presubscription costs and initial
   incremental expenditures for hardware and software related directly to the
   provision of equal access which would not be required to upgrade the
   switching capabilities of the office involved absent the provisions of equal
   access.

   Equivalent Gauge

   A standard cross section of cable conductors for use in equating the
   metallic content of cable conductors of all gauge to a common base.

   Equivalent Kilometers of 104 Wire 

   The basic units employed in the allocation of pole lines costs for
   determining the relative use made of poles by aerial cables and by aerial
   wire conductors of various sizes. This unit reflects the relative loads of
   such cable and wire carried on poles.

   Equivalent Pair Kilometers 

   The product of sheath Kilometers and the number of equivalent gauge pairs of
   conductors in a cable.

   Equivalent Sheath Kilometers 

   The product of (a) the length of a section of cable in kilometers (sheath
   kilometers) and (b) the ratio of the metallic content applicable to a
   particular group of conductors in the cable (e.g., conductors assigned to a
   category) to the metallic content of all conductors in the cable.

   Exchange Transmission Plant

   This is a combination of (a) exchange cable and wire facilties (b) exchange
   central office circuit equipment, including associated land and buildings
   and (c) information origination/termination equipment which forms a complete
   channel.

   Holding Time

   The time in which an item of telephone plant is in actual use either by a
   customer or an operator. For example, on a completed telephone call, holding
   time includes conversation time as well as other time in use. At local dial
   offices any measured minutes which result from other than customer attempts
   to place calls (as evidenced by the dialing of at least one digit) are not
   treated as holding time.

   Host Central Office

   An electronic analog or digital base switching unit containing the central
   call processing functions which service the host office and its remote
   locations.

   Information Origination/Termination Equipment

   Equipment used to input into or receive output from the telecommunications
   network.

   Interexchange Channel

   A circuit which is included in the interexchange transmission equipment.

   Interexchange Transmission Equipment

   The combination of (a) interexchange cable and wire facilities, (b)
   interexchange circuit equipment and, (c) associated land and buildings.

   Interlocal Trunk

   A circuit between two local central office units, either manual or dial.
   Interlocal trunks may be used for either exchange or toll traffic or both.

   Intertoll Circuits

   Circuits between toll centers and circuits between a toll center and a
   tandem system in a different toll center area.

   Local Channel

   The portion of a private line circuit which is included in the exchange
   transmission plant. However, common usage of this term usually excludes
   information origination/termination equipment.

   Local Office 

   A central office serving primarily as a place of termination for subscriber
   lines and for providing telephone service to the subscribers on these lines.

   Loop

   A pair of wires, or its equivalent, between a customer's station and the
   central office from which the station is served.

   Message

   A completed call, i.e., a communication in which a conversation or exchange
   of information took place between the calling and called parties.

   Message Service or Message Toll Service

   Switched service furnished to the general public (as distinguished from
   private line service). Except as otherwise provided, this includes exchange
   switched services and all switched services provided by interexchange
   carriers and completed by a local telephone company's access services, e.g.,
   MTS, WATS, Execunet, open-end FX and CCSA/ONALs.

   Message Units 

   Unit of measurement used for charging for measured message telephone
   exchange traffic within a specified area.

   Metropolitan Service Area 

   The area around and including a relatively large city and in which
   substantially all of the message telephone traffic between the city and the
   suburban points within the area is classified as exchange in one or both
   directions.

   Minutes-of-Use 

   A unit of measurement expressed as either holding time or conversation time.

   Minutes-of-Use-Kilometers 

   The product of (a) the number of minutes-of-use and (b) the average route
   kilometers of circuits involved.

   Multi-Center Exchange

   An exchange area in which are located two or more local central office
   buildings or wire centers.

   Operations

   The term denoting the general classifications of services rendered to the
   public for which separate tariffs are filed, namely exchange, state toll and
   interstate toll.

   Operator Trunks 

   A general term, ordinarily applied to trunks between manually operated
   switchboard positions and local dial central offices in the same wire
   center.

   Private Line Service

   A service for communications between specified locations for a continuous
   period or for regularly recurring periods at stated hours.

   Remote Access Line

   An access line (e.g., for WATS or TWX service) between a subscriber's
   premises in one toll rate center and a serving central office located in a
   different toll rate center.

   Remote Line Location 

   A remotely located subscriber line access unit which is normally dependent
   upon the central processor of the host office for call processing functions.

   Remote Trunk Arrangement (RTA)

   Arrangement that permits the extension of TSPS functions to remote
   locations.

   Reservation 

   That amount or quantity of property kept or set apart for a specific use.

   Reserved 

   Kept or set apart for a specific use.

   Separations

   The process by which telecommunication property costs, revenues, expenses,
   taxes and reserves are apportioned among the operations.

   Service Observing Unit 

   A unit of work measurement which is used as the common denominator to
   express the relative time required for handling the various work functions
   at service observing boards.

   Sheath Kilometers

   The actual length of cable in route kilometers.

   Special Services 

   All services other than message telephones, e.g., teletypewriter exchange
   service (TWX), private line services.

   Station-to-Station Basis 

   The term applied to the basis of toll rate making which contemplates that
   the message toll service charge (telephone or TWX) covers the use made of
   all facilities between the originating station and the terminating station,
   including the stations, and the services rendered in connection therewith.

   Study Area 

   Study area boundaries shall be frozen as they are on November 15, 1984

   Subscriber Line or Exchange Line 

   A communication channel between a telephone station, PBX or TWX station and
   the central office which serves it.

   Subtributary Office 

   A class of tributary office which does not have direct access to its toll
   center, but which is connected to its toll center office by means of
   circuits which are switched through to the toll center at another tributary
   office.

   Tandem Area 

   The general areas served by the local offices having direct trunks to or
   from the tandem office. This area may consist of one or more communities or
   may include only a portion of a relatively large city.

   Tandem Circuit or Trunk 

   A general classification of circuits or trunks between a tandem central
   office unit and any other central office or switchboard.

   Tandem Connection 

   A call switched at a tandem office.

   Tandem Office 

   A central office unit used primarily as an intermediate switching point for
   traffic between local central offices within the tandem area. Where
   qualified by a modifying expression, or other explanation, this term may be
   applied to an office employed for both the interconnection of local central
   offices within the tandem area and for the interconnection of these local
   offices with other central offices, e.g., long haul tandem office.

   Toll Center 

   An office (or group of offices) within a city which generally handles the
   originating and incoming toll traffic for that city to or from other toll
   center areas and which handles through switched traffic. The toll center
   normally handles the inward toll traffic for its tributary exchanges and, in
   general, either handles the outward traffic originating at its tributaries
   or serves as the outlet to interexchange circuits for outward traffic
   ticketed and timed at its tributaries. Toll centers are listed as such in
   the Toll Rate and Route Guide.

   Toll Center Area 

   The areas served by a toll center, including the toll center city and the
   communities served by tributaries of the toll center.

   Toll Center Toll Office 

   A toll office (as contrasted to a local office) in a toll center city.

   Toll Circuit 

   A general term applied to interexchange trunks used primarily for toll
   traffic.

   Toll Connecting Trunk 

   A general classification of trunks carrying toll traffic and ordinarily
   extending between a local office and a toll office, except trunks classified
   as tributary circuits. Examples of toll connecting trunks include toll
   switching trunks, recording trunks and recording-completing trunks.

   Toll Office 

   A central office used primarily for supervising and switching toll traffic.

   Traffic Over First Routes 

   A term applied to the routing of traffic and denoting routing via principal
   route for traffic between any two points as distinguished from alternate
   routes for such traffic.

   Operator System 

   A stored program electronic system associated with one or more toll
   switching systems which provides centralized traffic service position
   functions for several local offices at one location.

   Tributary Circuit 

   A circuit between a tributary office and a toll switchboard or intertoll
   dialing equipment in a toll center city.

   Tributary Office 

   A local office which is located outside the exchange in which a toll center
   is located, which has a different rate center from its toll center and which
   usually tickets and times only a part of its originating toll traffic, but
   which may ticket or time all or none, of such traffic. The toll center
   handles all outward traffic not ticketed and timed at the tributary and
   normally switches all inward toll traffic from outside the tributary's toll
   center to the tributary. Tributary offices are indicated as such in the Toll
   Rate and Route Guide.

   Trunks 

   Circuit between switchboards or other switching equipment, as distinguished
   from circuits which extend between central office switching equipment and
   information origination/termination equipment.

   TSPS Complex 

   All groups of operator positions, wherever located, associated with the same
   TSPS stored program control units.

   TWX 

   Teletypewriter Exchange Service.

   TWX Connection 

   A completed TWX call, i.e., a call on which a TWX communication was passed
   between the calling and called stations.

   TWX Connection-Minute-Kilometers

   The product of (a) the number of TWX connections, (b) the average minutes
   per TWX connection and (c) the average route kilometers of circuits
   involved.

   TWX Switching Plant Trunks 

   Interexchange circuits, excluding remote access lines, which handle 100 word
   per minute TWX traffic only.

   Weighted Standard Work Second 

   A measurement of traffic operating work which is used to express the
   relative time required to handle the various kinds of calls or work
   functions, and which is weighted to reflect appropriate degrees of waiting
   to serve time.

   Wide Area Telephone Service WATS 

   A toll service offering for customer dial type telecommunications between a
   given customer station and stations within specified geographic rate areas
   employing a single access line between the customer location and the serving
   central office. Each access line may be arranged for either outward
   (OUT-WATS) or inward (IN-WATS) service or both.

   Wideband Channel 

   A communication channel of a bandwidth equivalent to twelve or more voice
   grade channels.

   Working Loop 

   A revenue producing pair of wires, or its equivalent, between a customer's
   station and the central office from which the station is served.

   [ 52 FR 17229 , May 6, 1987, as amended at  53 FR 33012 , Aug. 29, 1988;  53 FR 39095 , Oct. 5, 1989;  58 FR 44905 , Aug. 25, 1993]
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