1、 TIA STANDARD ANSI/TIA-968-A-2002 Approved: October 29, 2002 Telecommunications Telephone Terminal Equipment Technical Requirements for Connection of Terminal Equipment to the Telephone Network TIA-968-A (Upgrade and Revision of TIA/EIA/IS-968) OCTOBER 2002 TELECOMMUNICATIONS INDUSTRY ASSOCIATION Re
2、presenting the telecommunications industry in association with the Electronic Industries Alliance Adopted by ACTA January 15, 2003 Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-PREFACE
3、 This document, TIA-968-A, Telecommunications Telephone Terminal Equipment Technical Requirements for Connection of Terminal Equipment to the Telephone Network, has been established pursuant to the Federal Communication Commissions (“FCC”) Report and Order in the 2000 Biennial Review of Part 68 of t
4、he Commissions Rules and Regulations, CC Docket No. 99-216, FCC 00-400, adopted November 9, 2000 and released December 21, 2000 (“Order” or “R b) Of all terminal equipment to channels furnished in connection with foreign exchange lines (customer-premises end), the station end of off-premises station
5、s associated with PBX and Centrex services, trunk-to-station tie lines (trunk end only) and switched service network station lines (CCSA and EPSCS); c) Of all PBX (or similar) systems to private line services for tie trunk type interfaces and off premises station lines; d) Of all terminal equipment
6、to subrate and 1.544 Mbps digital services; e) Of approved terminal equipment or approved protective circuitry to Local Area Data Channels and to channels which are similar to Local Area Data Channels that are obtained as special assemblies; f) Of all terminal equipment or systems to voiceband priva
7、te line channels for 2-point and multipoint private line services (excluding those identified in Category II, AT or voiceband metallic channels; g) Of the types of test equipment specified in section 1.3.56; h) Of all terminal equipment to Public Switched Digital Service (PSDS) Type I, II,or III; i)
8、 Of all terminal equipment to the Integrated Services Digital Network (ISDN) Basic Rate Access (BRA) or Primary Rate Access (PRA). j) Of all terminal equipment to ADSL services These criteria apply to terminal equipment approved after publication of this document. Previously approved TE retains its
9、status under the requirements in effect at the time the TE was approved. All TE shall continue to comply with the requirements in effect when the TE was approved. Equipment grandfathered by FCC action is identified in Annex A along with the conditions that allow such TE to be connected without appro
10、val. 1 Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,- TIA-968-A TE that is modified shall be re-approved under the requirements in effect at the time of the modification, not necessari
11、ly those requirements in effect at the time of the prior approval. Except as other wise specified herein, A modification is any change that affects the compliance of TE to this standard. Repair to TE, where no modification has occurred, does not require re-approval. Requirements retained by the Comm
12、ission in 47 CFR Part 68, including hearing aid compatibility and volume control, are not covered in this standard. Two categories of specifications are used in this standard, mandatory requirements and recommendations. Mandatory requirements are designated by the word “shall“ and recommendations by
13、 the word “should“. 1.2 NORMATIVE REFERENCES The following standard contains provisions which, through reference in this text, constitute provisions of this Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based
14、 on this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. ANSI and TIA maintain registers of currently valid national standards published by them. Informative references are provided in Annex B. 1) 47 CFR Part 68, Code of F
15、ederal Regulations (CFR), Title 47, FCC Part 68, Connection of Terminal Equipment to the Telephone Network. 2) ITU-T Recommendation G.711, 1993, General Aspects of Digital Transmission Systems - Terminal Equipment - Pulse Code Modulation (PCM) of Voice Frequencies. 3) TIA/EIA TSB 31-B, Part 68 Ratio
16、nale and Measurement Guidelines. 1.3 DEFINITIONS For the purposes of this Standard, the following definitions apply: NOTE: Informative definitions are included in Annex B. 2 Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking per
17、mitted without license from IHS-,-,-TIA-968-A 1.3.1 Approved protective circuitry: Separate, identifiable and discrete electrical circuitry designed to protect the telephone network from harm, which is approved in accordance with the rules and regulations in 68.7(b) and Subpart C of 47 CFR Part 68.
18、1.3.2 Approved terminal equipment: Terminal equipment that is approved in accordance with the rules and regulations in 68.7(b) and Subpart C of 47 CFR Part 68. 1.3.3 Asymmetric Digital Subscriber Line (ADSL) Modem: A modem having transmit signal characteristics meeting the spectral response and aggr
19、egate power level limitations of this standard. The term should be interpreted to include variations such as splitterless ADSL and Rate Adaptive DSL (RADSL) modems that have similar transmit signal characteristics meeting these limitations. 1.3.4 Auxiliary leads: Terminal equipment leads at the inte
20、rface, other than telephone connections and leads otherwise defined in this Standard, which leads are to be connected either to common equipment or to circuits extending to central office equipment. 1.3.5 Capture level: Equipment with AGC (Automatic Gain Control) signal power limiting has virtually
21、no output signal for input levels below a certain value. At some input signal power, the output level will become significant (usually corresponding to the expected output level) for the service application. The input level at which this occurs is defined as the capture level. 1.3.6 Central-office i
22、mplemented telephone: A telephone executing coin acceptance requiring coin service signaling from the central office. 1.3.7 Channel equipment: Equipment in the private line channel of the telephone network that furnishes telephone tip and ring, telephone tip-1 and ring-1, and other auxiliary or supe
23、rvisory 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). 1.3.8 Coin-implemented telephone: A telephone containing all circuitry required to execute coin acceptance and related functions within the inst
24、rument itself and not requiring coin service signaling from the central office. 1.3.9 Coin service: Central office implemented coin telephone service. 1.3.10 Companion terminal equipment: Companion terminal equipment represents the terminal equipment that would be connected at the far end of a netwo
25、rk facility and provides the range of operating conditions that the terminal equipment that is being approved would normally encounter. 1.3.11 Continuity leads: Terminal equipment continuity leads at the network interface designated CY1 and CY2 which are connected to a strap in a series jack configu
26、ration for the purpose of determining whether the plug associated with the terminal equipment is connected to the interface jack. 3 Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,- TIA-9
27、68-A 1.3.12 Digital milliwatt: A digital signal that is the coded representation of a 0 dBm, 1000 Hz sine wave. 1.3.13 Direct connection: Connection of terminal equipment to the telephone network by means other than acoustic and/or inductive coupling. 1.3.14 Dual Tone Multi Frequency (DTMF): network
28、 control signaling is a method of signaling using the voice transmission path. The method employs 16 distinct signals each composed of two voice band frequencies, one from each of two geometrically spaced groups designated low group and high group. The selected spacing assures that no two frequencie
29、s of any group combination are harmonically related. 1.3.15 E 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 an
30、d ring-1 are the receive pair). 1.3.26 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 1.1 for 2-wire loop or ground start circuits, Figure 1.2 for 2-wire reverse battery
31、circuits, Figure 1.3 for 4-wire loop or ground start circuits, Figure 1.4 for 4-wire reverse battery circuits, and Figure 1.9 for voiceband metallic channels. Figure 1.8 is an alternative termination for use in the 2-wire loop simulator circuits. Other implementations may be used provided that the s
32、ame 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
33、 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. 1.3.27 Make-busy leads: Terminal equipment leads at the network interface designated MB and MB1. The MB lead
34、 shall be 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. 1.3.28 Metallic Voltage: The potential difference between the tip and ring connections for the tip, ring pair of 2-wire and 4-wire con
35、nections 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). 1.3.29 Multi-port equipment: Equipment that has more than one telephone connection with provisions internal to the equipment
36、for establishing transmission paths among two or more telephone connections. 1.3.30 Network port: An equipment port of approved protective circuitry which port faces the telephone network. 1.3.31 Off-premises line simulator circuit: A load impedance for connection, in lieu of an 5 Copyright Electron
37、ic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,- TIA-968-A off-premises station line, to PBX (or similar) telephone system loop start circuits (Figure 1.7) during testing. The schematic diagram of Figure
38、1.7 is illustrative of the type of circuit which shall be used; alternative implementations may be used provided that the same dc voltage and current characteristics and ac impedance characteristics of Figure 1.7 shall be presented to the equipment under test as are presented in the illustrative sch
39、ematic diagram. When used, the simulator shall be operated over the entire range of loop resistances as indicated in Figure 1.7, 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
40、 testing. 1.3.32 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 approved station equipment located off the premises. Equipment leads at this interface are limited to
41、 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 approval conditions. 1.3.33 One-port equipment: Equipment
42、that has either exactly one telephone connection, or a multiplicity of telephone connections arranged so that no transmission occurs among such telephone connections, within the equipment. 1.3.34 Overload Point: For signal power limiting circuits incorporating automatic gain control method, the “ove
43、rload point” is the value of the input signal that is 15 dB greater than the capture level. For signal power limiting circuits incorporating peak limiting method, the ”overload point” is defined as the input level at which the equipments through gain decreases by 0.4 dB from its nominal constant gai
44、n. 1.3.35 Power connections: The connections between commercial power and any transformer, power supply rectifier, converter or other circuitry associated with approved terminal equipment or approved protective circuitry. The following are not power connections. (a) Connections between approved term
45、inal equipment or approved protective circuitry and sources of non-hazardous voltages (see section 4.4.4.4 for a definition of non-hazardous voltages). (b) Conductors that distribute any power within approved terminal equipment or within approved protective circuitry. (c) Green wire ground (the grou
46、nded conductor of a commercial power circuit that is UL-identified by a continuous green color). 1.3.36 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
47、 parties. 1.3.37 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 1.12 shows the type of circuit that shall be used. Other test cir
48、cuit 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 6
49、Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-968-A 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. 1.3.38 Public Switched Digital Service Type I (PSDS Type I): This service functions only in a digital mode. It employs a tran
