Sec. 68.3  Definitions.

    As used in this part:
    AIOD data channel simulator: A test circuit that simulates a 
telephone line during the idle and data-receiver-attached conditions of 
central office AIOD circuits. The schematic of Figure 68.3(g) is 
illustrative of the type of circuit that will be required; alternative 
implementations may be used provided that the same dc voltage and 
current characteristics and ac impedance characteristics will be 
presented to the AIOD equipment under test. When used, the simulator 
circuit shall be operated over the entire range of resistance, 
polarities and voltage limits indicated in Figure 68.3(g). Whenever dc 
current is changed, sufficient time shall be allocated for the current 
to reach a steady-state condition before continuing the test.
    AIOD leads: Terminal equipment leads at the interface solely to 
transmit Automatic Identified Outward Dialing (AIOD) data from a PBX to 
the public switched telephone network or to switched service networks 
(e.g. EPSCS) so that a telephone company can provide a PBX customer with 
a detailed monthly bill identifying long distance usage by individual 
PBX stations, tie trunks or the attendant. Data on the channel is 
transmitted in only one direction, from the PBX to the central office, 
and consists of a trunk number and a station number for each outgoing 
call. Two-way dc simplex signaling, as defined for the terminal 
equipment by the data channel simulator circuit, is used to coordinate 
the transmitting and receiving functions. One or more pairs of AIOD 
leads, each designated T (AI) and R (AI) to distinguish them from other 
tip and ring leads, may appear at an interface, depending on the number 
of central offices that process AIOD calls for the PBX. However, unless 
otherwise stated, these leads at the interface should be treated as 
telephone connections as defined in (x) of this section or as tip and 
ring where the term ``telephone connection'' is not used.
    Auxiliary leads: Terminal equipment leads at the interface, other 
than telephone connections and leads otherwise defined in these Rules, 
which leads are to be connected either to common equipment or to 
circuits extending to central office equipment.
    Central-office implemented telephone: A telephone executing coin 
acceptance requiring coin service signaling from the central office.
    Channel equipment: Equipment in the private line channel of the 
telephone network that furnishes telephone tip and ring, telphone tip 1 
and ring 1, and other auxiliary or supervisory signaling leads for 
connection at the private line channel interface (where tip 1 and ring 1 
is the receive pair for 4-wire telephone connections).
    Coin-implemented telephone: A telephone containing all circuitry 
required to execute coin acceptance and related functions within the 
instrument itself

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and not requiring coin service signaling from the central office.
    Coin service: Central office implemented coin telephone service.
    Companion terminal equipment: Companion terminal equipment 
represents the terminal equipment that would be connected at the far end 
of a network facility and provides the range of operating conditions 
that the terminal equipment which is being registered would normally 
encounter.
    Continuity leads: Terminal equipment continuity leads at the network 
interface designated CY1 and CY2 which are connected to a strap in a 
series jack configuration for the purpose of determining whether the 
plug associated with the terminal equipment is connected to the 
interface jack.
    Demarcation point: The point of demarcation and/or interconnection 
between telephone company communications facilities and terminal 
equipment, protective apparatus or wiring at a subscriber's premises. 
Carrier-installed facilities at, or constituting, the demarcation point 
shall consist of wire or a jack conforming to subpart F of part 68 of 
the Commission's rules. ``Premises'' as used herein generally means a 
dwelling unit, other building or a legal unit of real property such as a 
lot on which a dwelling unit is located, as determined by the telephone 
company's reasonable and nondiscriminatory standard operating practices. 
The ``minimum point of entry'' as used herein shall be either the 
closest practicable point to where the wiring crosses a property line or 
the closest practicable point to where the wiring enters a multiunit 
building or buildings. The telephone company's reasonable and 
nondiscriminatory standard operating practices shall determine which 
shall apply. The telephone company is not precluded from establishing 
reasonable classifications of multiunit premises for purposes of 
determining which shall apply. Multiunit premises include, but are not 
limited to, residential, commercial, shopping center and campus 
situations.
    (a) Single unit installations. For single unit installations 
existing as of August 13, 1990, and installations installed after that 
date the demarcation point shall be a point within 30 cm (12 in) of the 
protector or, where there is no protector, within 30 cm (12 in) of where 
the telephone wire enters the customer's premises, or as close thereto 
as practicable.
    (b) Multiunit installations. (1) In multiunit premises existing as 
of August 13, 1990, the demarcation point shall be determined in 
accordance with the local carrier's reasonable and non-discriminatory 
standard operating practices. Provided, however, that where there are 
multiple demarcation points within the multiunit premises, a demarcation 
point for a customer shall not be further inside the customer's premises 
than a point twelve inches from where the wiring enters the customer's 
premises, or as close thereto as practicable.
    (2) In multiunit premises in which wiring is installed after August 
13, 1990, including major additions or rearrangements of wiring existing 
prior to that date, the telephone company may establish a reasonable and 
nondiscriminatory practice of placing the demarcation point at the 
minimum point of entry. If the telephone company does not elect to 
establish a practice of placing the demarcation point at the minimum 
point of entry, the multiunit premises owner shall determine the 
location of the demarcation point or points. The multiunit premises 
owner shall determine whether there shall be a single demarcation point 
location for all customers or separate such locations for each customer. 
Provided, however, that where there are multiple demarcation points 
within the multiunit premises, a demarcation point for a customer shall 
not be further inside the customer's premises than a point 30 cm (12 in) 
from where the wiring enters the customer's premises, or as close 
thereto as practicable.
    (3) In multiunit premises with more than one customer, the premises 
owner may adopt a policy restricting a customer's access to wiring on 
the premises to only that wiring located in the customer's individual 
unit that serves only that particular customer.
    Digital milliwatt: A digital signal that is the coded representation 
of a 0 dBm, 1000 Hertz sine wave.

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    Direct connection: Connection of terminal equipment to the telephone 
network by means other than acoustic and/or inductive coupling.
    E&M leads: Terminal equipment leads at the interface, other than 
telephone connections and auxiliary leads, which are to be connected to 
channel equipment solely for the purpose of transferring supervisory 
signals conventionally known as Types I and II E&M and schematically 
shown in Figures 68.3(e)(i) and 68.3(a)(ii).
    Encoded analog content: The analog signal contained in coded form 
within a digital signal.
    Equivalent power: The power of the analog signal at the output of a 
zero level decoder, obtained when a digital signal is the input to the 
decoder.
    Essential Telephones: Means only coin-operated telephones, 
telephones provided for emergency use, and other telephones frequently 
needed for use by persons using such hearing aids.
    Harm: Electrical hazards to telephone company personnel, damage to 
telephone company equipment, malfunction of telephone company billing 
equipment, and degradation of service to persons other than the user of 
the subject terminal equipment, his calling or called party.
    Hearing aid compatible: Except as used at Secs. 68.4(a)(3) and 
68.414, the terms hearing aid compatible or hearing aid compatibility 
are used as defined in Sec. 68.316, unless it is specifically stated 
that hearing aid compatibility volume control, as defined in 
Sec. 68.317, is intended or is included in the definition.
    Inband signaling private line interface: The point of connection 
between an inband signaling voiceband private line and terminal 
equipment or systems where the signaling frequencies are within the 
voiceband. All tip and ring leads shall be treated as telephone 
connections for the purposes of fulfilling registration conditions.
    Instrument-implemented telephone: A telephone containing all 
circuitry required to execute coin acceptance and related functions 
within the instrument itself and not requiring coin service signaling 
from the central office.
    ISDN Basic Rate Interface: A two-wire interface between the terminal 
equipment and ISDN BRA. The tip and ring leads shall be treated as 
telephone connections for the purpose of fulfilling registration 
conditions.
    ISDN Primary Rate Interface: A four-wire interface between the 
terminal equipment and 1.544 Mbps ISDN PRA. The tip, ring, tip-1, and 
ring-1 leads shall be treated as telephone connections for the purpose 
of fulfilling registration conditions.
    Local area data channel (LADC) leads: Terminal equipment leads at 
the interface used to transmit and/or receive signals which may require 
greater-than-voiceband frequency spectrum over private line metallic 
channels designated Local Area Data Channels (LADC). These leads should 
be treated as ``telephone connections'' as defined in this section or as 
tip and ring connections where the term ``telephone connection'' is not 
used.
    Local area data channel simulator circuit: A circuit for connection 
in lieu of a Local Area Data Channel to provide the appropriate 
impedance for signal power tests. The schematic of Figure 68.3(k) is 
illustrative of the type of circuit that will be required over the given 
frequency ranges. When used, the simulator shall be operated over the 
appropriate range of loop resistance for the equipment under test, under 
all voltages and polarities that the terminal under test and a connected 
companion unit are capable of providing.
    Longitudinal voltage: One half of the vector sum of the potential 
difference between the tip connection and earth ground, and the ring 
connection and earth ground for the tip, ring pair of 2-wire and 4-wire 
connections; and, additionally for 4-wire telephone connections, one 
half of the vector sum of the potential difference between the tip 1 
connection and earth ground and the ring 1 connection and earth ground 
for the tip 1, ring 1 pair (where tip 1 and ring 1 are the receive 
pair).
    Loop simulator circuit. A circuit that simulates the network side of 
a 2-wire or 4-wire telephone connection during testing. The required 
circuit schematics are shown in Figure 68.3(a) for 2-wire loop or ground 
start circuits, Figure 68.3(b) for 2-wire reverse battery circuits, 
Figure 68.3(c) for 4-wire loop or ground start circuits, Figure 68.3(d) 
for 4-wire reverse battery circuits, and

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Figure 68.3(j) for voiceband metallic channels. Figure 68.3(i) is an 
alternative termination for use in the 2-wire loop simulator circuits. 
Other implementations may be used provided that the same dc voltage and 
current characteristics and ac impedance characteristics will be 
presented to the equipment under test as are presented in the 
illustrative schematic diagrams. When used, the simulator shall be 
operated over the entire range of loop resistance as indicated in the 
figures, and with the indicated polarities and voltage limits. Whenever 
loop current is changed, sufficient time shall be allocated for the 
current to reach a steady-state condition before continuing testing.
    Make-busy leads: Terminal equipment leads at the network interface 
designated MB and MB1. The MB lead is connected by the terminal 
equipment to the MB1 lead when the corresponding telephone line is to be 
placed in an unavailable or artificially busy condition.
    Message register leads: Terminal equipment leads at the interface 
used solely for receiving dc message register (MR) pulses from a central 
office at a PBX so that message unit information normally recorded at 
the central office only is also recorded at the PBX. Signaling on the 
channel is by the application of battery and open conditions applied at 
the central office. No ac signaling is applied either by the PBX or by 
the central office. One or more pairs of MR leads, each designated T 
(MR) and R (MR) may appear at an interface depending on the number of 
PBX-CO trunks (one MR channel per PBX-CO trunk). However, unless 
otherwise stated, these leads at the interface should be treated at 
telephone connections as defined in paragraph (x) of this section or as 
tip and ring where the term ``telephone connection'' is not used.
    Message register signaling channel simulator: A circuit that 
simulates a telephone line (2-wire or single conductor) and a central 
office message register battery feed circuit used to convey message 
register information from the central office to a PBX. The schematic of 
Figure 68.3(h) is illustrative of the type of circuit that will be 
required; alternative implementation may be used provided that the same 
dc voltage and current characteristics and ac impedance characteristics 
will be presented to the message register equipment under test. When 
used, the simulator circuit shall be operated over the entire range of 
resistance and voltage values indicated in Figure 68.3(h). Whenever dc 
current is changed, sufficient time shall be allocated for the current 
to reach a steady-state condition before continuing the test.
    Metallic voltage: The potential difference between the tip and ring 
connections for the tip, ring pair of 2-wire and 4-wire connections and 
additionally for 4-wire telephone connections, between the tip 1 and 
ring 1 connections for the tip 1, ring 1 pair (where tip 1 and ring 1 
are the receive pair).
    Multi-port equipment: Equipment that has more than one telephone 
connection with provisions internal to the equipment for establishing 
transmission paths among two or more telephone connections.
    Network port: An equipment port of registered protective circuitry 
which port faces the telephone network.
    Non-system premises wiring: Wiring that is used with up to four-line 
business and residence services, located at the subscriber's premises.
    (a) Fully protected non-system premises wiring. Non-system premises 
wiring which is electrically behind registered (or grandfathered) 
equipment or protective circuitry which assures that electrical contact 
between the wiring and commercial power wiring or earth ground will not 
result in hazardous voltages at the telephone network interface.
    (b) Unprotected non-system premises wiring: All other non-system 
premises wiring.
    Off-premises line simulator circuit: A load impedance for 
connection, in lieu of an off-premises station line, to PBX (or similar) 
telephone system loop start circuits (Figure 68.3(f)) during testing. 
The schematic diagram of Figure 68.3(f) is illustrative of the type of 
circuit which will be required; alternative implementations may be used 
provided that the same dc voltage and current characteristics and ac 
impedance characteristics will be presented

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to the equipment under test as are presented in the illustrative 
schematic diagram. When used, the simulator shall be operated over the 
entire range of loop resistances as indicated in Figure 68.3(f), and 
with the indicated polarities. Whenever loop current is changed, 
sufficient time shall be allocated for the current to reach a steady-
state condition before continuing testing.
    Off-premises station interface: The point of connection between PBX 
telephone systems (or similar systems) and telephone company private 
line communication facilities used to access registered station 
equipment located off the premises. Equipment leads at this interface 
are limited to telephone tip and ring leads (designated T(OPS) and 
R(OPS)) where the PBX employs loop-start signaling at the interface. 
Unless otherwise noted, all T(OPS) and R(OPS) leads shall be treated as 
telephone connections for purposes of fulfilling registration 
conditions.
    One-port equipment: Equipment which has either exactly one telephone 
connection, or a multiplicity of telephone connections arranged so that 
no transmission among such telephone connections, within the equipment, 
is intended.
    Power connections: The connections between commercial power and any 
transformer, power supply rectifier, converter or other circuitry 
associated with registered terminal equipment or registered protective 
circuitry. The following are not power connections.
    (a) Connections between registered terminal equipment or registered 
protective circuitry and sources of non-hazardous voltages (see 
Sec. 68.306(b)(4) for a definition of non-hazardous voltages).
    (b) Conductors which distribute any power within registered terminal 
equipment or within registered protective circuitry.
    (c) Green wire ground (the grounded conductor of a commercial power 
circuit which is UL-identified by a continuous green color).
    Private line channel: Telephone company dedicated facilities and 
channel equipment used in furnishing private line service from the 
telephone network for the exclusive use of a particular party or 
parties.
    Private Radio Services: Means private land mobile radio services and 
other communications services characterized by the Commission in its 
rules as private radio services.
    PSDS Type II Analog Mode Loop Simulator Circuit: A circuit 
simulating the network side of the two-wire telephone connection that is 
used for testing terminal equipment to be connected to the PSDS Type II 
loops. Figure 68.3(m) shows the type of circuit required. Other test 
circuit configurations may be used provided they operate at the same DC 
voltage and current characteristics and AC impedance characteristics 
presented in the illustrated circuit. When utilized, the simulator 
should be operated over the entire range of loop resistances, and with 
the indicated voltage limits and polarities. Whenever the loop current 
is changed, sufficient time shall be allowed for the current to reach a 
steady-state condition before continuing testing.
    Public Mobile Services: Means air-to-ground radiotelephone services, 
cellular radio telecommunications services, offshore radio, rural radio 
service, public land mobile telephone service, and other common carrier 
radio communications services covered by part 22 of title 47 of the Code 
of Federal Regulations.
    Public Switched Digital Service Type I (PSDS Type I): This service 
functions only in a digital mode. It employs a transmission rate of 56 
Kbps on both the transmit and receive pairs to provide a four-wire full 
duplex digital channel. Signaling is accomplished using bipolar patterns 
which include bipolar violations.
    Public Switched Digital Service Type II (PSDS Type II): This service 
functions in two modes, analog and digital. Analog signaling procedures 
are used to perform supervisory and address signaling over the network. 
After an end-to-end connection is established, the Switched Circuit Data 
Service Unit (SCDSU) is switched to the digital mode. The time 
compression multiplexing (TCM) transmission operated at a digital 
transmission speed of 144 Kbps to provide full-duplex 56 Kbps on the 
two-wire access line.
    Public Switched Digital Service Type III (PSDS Type III): This 
service functions

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only in a digital mode. It uses a time compression multiplexing (TCM) 
rate of 160 Kbps, over one pair, to provide two full-duplex channels--an 
8 Kbps signaling channel for supervisory and address signaling, and a 64 
Kbps user data channel on a two-wire access line.
    Registered protective circuitry: Separate, identifiable and discrete 
electrical circuitry designed to protect the telephone network from 
harm, which is registered in accordance with the rules and regulations 
in Subpart C of this part.
    Registered terminal equipment: Terminal equipment which is 
registered in accordance with the rules and regulations in Subpart C of 
this part.
    Ringdown private line interface: The point of connection between 
ringdown voiceband private line service and terminal equipment or 
systems which provide ringing (20 or 30 Hz) in either direction for 
alerting only. All tip and ring leads shall be treated as telephone 
connections for the purposes of fulfilling registration conditions. On 
2-wire circuits the ringing voltage is applied to the ring conductor 
with the tip conductor grounded. On 4-wire circuits the ringing voltage 
is simplexed on the tip and ring conductors with ground simplexed on the 
tip (1) and ring (1) conductors.
    Secure Telephones: Means telephones that are approved by the United 
States Government for the transmission of classified or sensitive voice 
communications.
    Specialty adapters: Adapters that contain passive components such as 
resistive pads or bias resistors typically used for connecting data 
equipment having fixed-loss loop or programmed data jack network 
connections to key systems or PBXs.
    Subrate digital service: A digital service providing for the full-
time simultaneous two-way transmission of digital signals at synchronous 
speeds of 2.4, 4.8, 9.6 or 56 kbps.
    Switched Circuit Data Service Unit (SCDSU): A CPE device, with PSDS 
functionality, located between the Network Interface and the data 
terminal equipment. (It also is sometimes referred to as Network Channel 
Terminating Equipment).
    System premises wiring: Wiring which connects separately-housed 
equipment entities or system components to one another, or wiring which 
connects an equipment entity or system component with the telephone 
network interface, located at the customer's premises and not within an 
equipment housing.
    (a) Fully protected systems premises wiring. Premises wiring which 
is either:
    (1) No greater than 15 meters (50 feet) in length (measured linearly 
between the points where it leaves equipment or connector housings) and 
registered as a component of and supplied to the user with the 
registered terminal equipment or protective circuitry with which it is 
to be used. Such wiring shall either be pre-connected to the equipment 
or circuitry, or may be so connected by the user (or others) if it is 
demonstrated in the registration application that such connection by the 
untrained will not result in harm, using relatively fail-safe means.
    (2) A cord which complies with the previous subsection either as an 
integral length or in combination with no more than one connectorized 
extension cord. If used, the extension cord must comply with the 
requirements of Sec. 68.200(h) of these Rules.
    (3) Wiring located in an equipment room with restricted access, 
provided that this wiring remains exposed for inspection and is not 
concealed or embedded in the building's structure, and that it conforms 
to Sec. 68.215(d).
    (4) Electrically behind registered (or grandfathered) equipment, 
system components or protective circuitry which assure that electrical 
contact between the wiring and commercial power wiring or earth ground 
will not result in hazardous voltages or excessive longitudinal 
imbalance at the telephone network interface.
    (b) Protected system premises wiring requiring acceptance testing 
for imbalance. Premises wiring which is electrically behind registered 
(or grandfathered) equipment, system components or circuitry which 
assure that electrical contact between the wiring and commercial power 
wiring will not result in hazardous voltages at the telephone network 
interface.
    (c) Unprotected system premises wiring. All other premises wiring.

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    Telephone connection: Connection to telephone network tip and ring 
leads for 2-wire and 4-wire connections and, additionally, for 4-wire 
telephone connections, tip 1 and ring 1 leads and all connections 
derived from these leads. The term ``derived'' as used here means that 
the connections are not separated from telephone tip and ring or from 
telephone tip 1 and ring 1 by a sufficiently protective barrier. Part 68 
Rules that apply specifically to telephone network tip and ring pairs 
shall also apply to telephone network tip 1 and ring 1 pairs unless 
otherwise specified. In 4-wire connections, leads designated tip and 
ring at the interface are for transmitting voice frequencies toward the 
network and leads designated tip 1 and ring 1 at the interface are for 
receiving voice frequencies from the network.
    Telephone network: The public switched network and those private 
lines which are defined in Sec. 68.2(a) (2) and (3).
    Terminal port: An equipment port of registered protective circuitry 
which port faces remotely-located terminal equipment.
    Test Equipment: Equipment connected at the customer's premises that 
is used on the customer's side of the network interfaces to measure 
characteristics of the telephone network, or to detect and isolate a 
communications fault between a terminal equipment entity and the 
telephone network. Registration is required for test equipment capable 
of functioning as portable traffic recorded or equipment capable of 
transmitting or receiving test tones; except registration is not 
required for devices used by telephone companies solely for network 
installation and maintenance activities such as hand-held data 
terminals, linesmen's handsets, and subscriber line diagnostic devices.
    Tie trunk transmission interfaces.
    (a) 2-Wire: A 2-wire transmission interface with a path that is 
essentially lossless (except for 2dB switched pad operation, or 
equivalent) between the interface and the 2-wire or 4-wire, transmission 
reference point of the terminal equipment.
    (b) 4-Wire lossless: A 4-wire transmission interface with a path 
that is essentially lossless (except for 2dB switched pad operation, or 
equivalent) between the interface and the 2-wire or 4-wire transmission 
reference point of the terminal equipment; and
    (c) 4-Wire Conventional Terminating Set (CTS): A 4-wire interface 
with a path to the transmission reference point that has a conventional 
terminating set providing 2-wire to 4-wire conversion with approximately 
4dB of loss and having no gain elements. This device's loss will be 
referred to as a ``nominal'' 4dB, but in no case is it allowed to be 
less than 3dB.
    (d) Direct Digital Interface: An interface between a digital PBX and 
a digital transmission facility.
    (e) Digital Tandem 4-Wire Interface: A 4-wire digital interface 
between digital terminal equipment and a digital transmission facility 
operating at 1.544 Mbps or subrate connecting terminal equipment that 
provide tandem connections.
    (f) Digital Satellite 4-wire Interface: A 4-wire digital interface 
between digital terminal equipment and a digital transmission facility 
operating at 1.544 Mbps or subrate connecting terminal equipment that 
does not provide tandem connections to other digital terminal equipment.
    Voiceband metallic private line channel interface: The point of 
connection between a voiceband metallic private line channel and 
terminal equipment or systems where the network does not provide any 
signaling or transmission enhancement. Registered terminal equipment or 
systems may use convenient signaling methods so long as the signals are 
provided in such a manner that they cannot interfere with adjacent 
network channels. All tip and ring leads shall be treated as telephone 
connections for the purpose of fulfilling registration conditions.
    Zero level decoder: A decoder that yields an analog level of 0 dBm 
at its output when the input is the digital milliwatt signal. See Figure 
68.3(l).
    1.544 Mbps digital CO 4-wire interface: A 4-wire digital interface 
between digital terminal equipment and a digital transmission facility 
operating at 1.544 Mbps connecting to a serving central office.
    1.544 Mbps digital service: A full-time dedicated private line 
circuit used for

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the transmission of digital signals at a speed of 1.544 Mbps.

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[45 02 FR 20841 , Mar. 31, 1980, as amended at  46 FR 40192 , Aug. 7, 1981;  49 FR 21734 , May 23, 1984;  49 FR 48720 , Dec. 14, 1984;  50 FR 48208 , Nov. 
22, 1985;  51 FR 937 , Jan. 9, 1986;  54 FR 21430 , May 18, 1989;  55 FR 28629 , July 12, 1990;  58 FR 44907 , Aug. 25, 1993;  61 FR 42186 , Aug. 14, 
1996;  61 FR 42387 , Aug. 15, 1996;  61 FR 52324 , Oct. 7, 1996;  62 FR 36464 , July 8, 1997]

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