1、 ANSI/TIA-968-B-2009 APPROVED: AUGUST 11, 2009 REAFFIRMED: NOVEMBER 7, 2016 Telecommunications Telephone Terminal Equipment Technical Requirements for Connection of Terminal Equipment to the Telephone Network TIA-968-B (Revision of TIA-968) August 2009 Adopted by ACTA September 22, 2009 NOTICE TIA E
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24、LICATION 2 2 NORMATIVE REFERENCES.3 3 TERMS AND DEFINITIONS.4 3.1 DEFINITIONS .4 3.2 ACRONYMS 2. Tolerances were added for Type A and Type B surge wave shapes; 3. The clause on leakage current limitations was rewritten for clarity but the requirements remain the same; 4. Coin deposit signals were ad
25、ded along with DTMF as examples of signals generated by terminal equipment that are used for network control; 5. Requirements that were inadvertently deleted in TIA-968-A have been restored for data circuit terminal equipment intended to operate with a programming resistor for signal level control;
26、6. Clarified that the tip ground state of loop start central office implemented telephones does not require transverse balance testing; 7. Clarified in the applications section that terminal equipment must comply with the applicable technical criteria of this Standard at any control adjustment emplo
27、yed; 8. Annex A was clarified by limiting the grandfather clauses for non-approved equipment to the United States; 9. New requirements were added for ADSL all digital mode, reach-extended ADSL and VDSL2. Other DSL requirements previously referenced from T1.417 were also added; 10. Component approval
28、 requirements previously located in TSB-129-A were included in this Standard; viii TIA-968-B This Standard was produced by TIA Subcommittee TR-41.9, Technical Regulatory Considerations, and its TR-41.9.1 working group for TIA-968-B. It was developed in accordance with ANSI and TIA guidelines and rep
29、resents the consensus position of the working group and its parent subcommittee, which served as the formulating group. It has also received the concurrence of Engineering Committee TR-41, User Premises Telecommunications Requirements. Committee approval of this Standard does not imply that all memb
30、ers voted for its approval. Suggestions for improvement to this Standard are welcome. They should be sent to: Telecommunications Industry Association Engineering Department Suite 300 2500 Wilson Boulevard Arlington, VA 22201 ix TIA-968-B x The leadership of the TR-41.9 Technical and Administrative R
31、egulatory Considerations subcommittee (Chair: Phillip Havens, Littelfuse, and Working Group Chair: Roger Hunt, Thomson) acknowledge the contributions provided by the following individuals in the development of this Standard. Organization Representative Previous Editions TIA-968-B Hewlett-Packard Sco
32、tt Roleson x Editor Littelfuse (formerly Teccor) Phillip Havens x Editor x Mobile Engineering Steven Bipes x Editor Telecommunications Information Services Jeffery Bipes x Editor ADTRAN, Inc Larry Bell x Alcatel Canada Philip Taffinder x ATLINKS USA Inc Clint Pinkham x Bourns (UK) Mick Maytum x Broa
33、dcom Rafi Rahamim x Cisco Systems Tim Lawler x x Communications Certification Laboratories Anh Wride x Conexant Systems Massimo Sorbara x Industry Canada Hazim Dawood x Industry Canada Efrain Guevara x Industry Canada Henry Mar x Industry Canada Matthew Mulvihill x x Intertech Systems Scott Lambert
34、x Mitel Networks Greg Slingerland x Mobile Engineering John Bipes X x Nortel Roger Britt x Pador Enterprises Pierre Adornato x Paradyne Corporation Peter Walsh x Randolph Telecom, Inc. Joe Randolph x Sanmina John Shinn x SBC (now AT and, additionally for four-wire telephone connections, one half of
35、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 two-wire or four-wire t
36、elephone connection during 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. Met
37、allic voltage: The potential difference between the tip and ring connections for the tip, ring pair of two-wire and four-wire connections and additionally for four-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
38、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 approved protective circuitry which port faces the telephone ne
39、twork. Off-premises line simulator: A load impedance for connection, in lieu of an off-premises station line, to PBX (or similar) telephone system loop start circuits during testing. Off-premises station (OPS) interface: The point of connection between PBX telephone systems (or similar systems) and
40、telephone company private line communication facilities used to access approved 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
41、otherwise noted, all T(OPS) and R(OPS) leads are treated as telephone connections for purposes of fulfilling approval conditions. One-port equipment: Equipment that has either exactly one telephone connection, or a multiplicity of telephone connections arranged so that no transmission occurs among s
42、uch telephone connections, within the equipment. Overload point: For signal power limiting circuits incorporating automatic gain control method, the “overload point” is the value of the input signal that is 15 dB greater than the capture level. For signal power limiting circuits incorporating peak l
43、imiting 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 gain. 6 TIA-968-B Power connections: The connections between commercial power and any transformer, power supply rectifier, converter or other circuitr
44、y associated with approved terminal equipment or approved protective circuitry. The following are not power connections. (a) Connections between approved terminal equipment or approved protective circuitry and sources of non-hazardous voltages. (b) Conductors that distribute any power within approve
45、d terminal equipment or within approved protective circuitry. (c) Green wire ground (the grounded conductor of a commercial power circuit that is UL-identified by a continuous green color). Private line channels: Telephone company dedicated facilities and channel equipment used in furnishing private
46、 line service from the telephone network for the exclusive use of a particular party or parties. PSDS Type II analog mode loop simulator: 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.
47、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 transmitting and receiving pairs to provide a four-wire full duplex digital channel. Signaling is accomplished using bipolar patterns that includ
48、e 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 Circu
49、it 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 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
