BS-7606-1992.pdf

BRITISH STANDARD BS 7606:1992 Specification for Social alarm system apparatus for connection to public switched telephone networks Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:38:36 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7606:1992 This British Standard, having been prepared under the direction of the Consumer and Contract Goods Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 October 1992 © BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference CCM/27 Draft for comment 90/42865 DC ISBN 0 580 21189 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Consumer and Contract Goods Standards Policy Committee (CCM/-) to Technical Committee CCM/27, upon which the following bodies were represented: Association of Metropolitan Authorities Association of Security Consultants British Security Industry Association Consumer Policy Committee of BSI Consumers Association Department of Health Electronic Components Industry Federation Institute of Housing Social Alarm Trade Association The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Association of Electronics, Telecommunications and Business Equipment Industries British Approvals Board for Telecommunications British Telecommunications plc OFTEL (Office of Telecommunications) Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:38:36 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7606:1992 © BSI 08-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2References1 3Abbreviations and definitions1 4General requirements1 5Alarm receiving station apparatus2 6Privacy considerations3 List of referencesInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:38:36 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7606:1992 ii © BSI 08-1999 Foreword This British Standard has been prepared under the direction of the Consumer and Contract Goods Standards Policy Committee to provide requirements for social alarm system equipment concerned with the telephonic communication of an alarm condition and is based upon Special Investigation Test Schedule 87/33 prepared by the British Approvals Board for Telecommunications. In order to simplify the regulatory requirements for social alarm systems for use by the elderly or other persons considered to be at risk, this British Standard specifies limited requirements; speech transmission and system performance requirements are not included except to ensure that alarm calls can be set up without interference to other users of, or damage to, any public telecommunications network to which the system is connected. Necessary requirements for electrical and acoustic safety are fully specified, however, manufacturers are encouraged to meet all of the relevant requirements and recommendations of the standards referred to in this British Standard and are reminded that an approval for the purposes of the Telecommunications Act 1984 does not imply fitness for purpose. In particular, attention is drawn to BS 6804:1986 the British Standard code of practice for social alarm systems which provides information to assist in the selection of a system and recommendations for the performance of equipment together with a diagram of a typical social alarm system. The public telecommunications operators require any person who connects subscribers apparatus directly or indirectly to any telecommunication system to comply with the terms and conditions relating to the attachment of apparatus under which service is provided. This standard is presented for designation under Section 22 of the Telecommunications Act 1984. It is stipulated in that Section of the Act that apparatus within the scope of a designated standard may only be approved for connection to a telecommunication system if it conforms to that standard, subject to such exceptions as may be determined by or under the designation. The designation of this standard may stipulate variations of, or additions to, the requirements of this standard and may also set conditions that have to be complied with as regards the apparatus, or its connection, or use. A copy of the designation will be included, when available, with all copies of this standard. Any further information on, or details of, the designation of this standard may be obtained from the Office of Telecommunications (OFTEL), Export House, 50 Ludgate Hill, London EC4M 7JJ. This British Standard does not deal with radio transmission requirements for social alarm equipment. The Radiocommunications Agency should be consulted about approval and/or licenses required for such transmissions. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Attention is drawn to SI 1985 No. 717 “The Telecommunications Apparatus (Marking and Labelling) Order 1985” which calls up the Low Voltage Directive (not applicable to alarm receiving stations). Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:38:36 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7606:1992 © BSI 08-19991 1 Scope This British Standard specifies requirements for apparatus in a social alarm system intended for connection to public switched telephone networks. 2 References 2.1 Normative references This British Standard incorporates, by reference, provisions from specific editions of other publications. These normative references are cited at the appropriate points in the text and the publications are listed on the inside back cover. Subsequent amendments to, or revisions of, any of these publications apply to this British Standard only when incorporated in it by updating or revision. 2.2 Informative references This British Standard refers to other publications that provide information or guidance. Editions of these publications current at the time of issue of this standard are listed on the inside back cover, but reference should be made to the latest edition. 3 Abbreviations and definitions For the purposes of this British Standard the abbreviations and definitions given in BS 6305:1982, BS 6804:1986 and BS 7369:1991 apply, together with the following. 3.1 local unit that part of a social alarm system which receives and transfers signals between the short range transmission and the long range transmission NOTEA local unit may incorporate a telephone handset and/or a loudspeaking telephone. 3.2 remote site dwelling or group of dwellings monitored by a social alarm system 3.3 door unit intercommunication equipment that may communicate with any local unit at the same site and with an alarm receiving station 3.4 master unit equipment, used in conjunction with a local unit, by means of which it is possible to communicate with any local unit at the same site or with the alarm receiving station NOTEA master unit may be integral with the local unit and activated when required, for example, by means of a key. 3.5 long range transceiver device which provides an interface between the local unit and the PSTN, and which may be an integral part of the local unit NOTEThis device will provide all necessary electrical isolation and signal level control between the local unit and the PSTN. Call set-up to the PSTN may be by loop disconnect or multi-frequency tone signalling initiated manually or automatically. 3.6 dispersed scheme number of separated dwellings with individual social alarm systems 4 General requirements 4.1 Application The requirements given in this clause shall apply to long range transceiver apparatus and to alarm receiving station apparatus. 4.2 Safety Apparatus shall conform to the safety requirements given in BS 6301:1989. Portable apparatus shall be constructed so as to maintain safety requirements after impact, in accordance with 16.2 of BS 6317:1982. NOTE 1Where cables from the PSTN to a long-range transceiver may be routed externally to the building in which the equipment is installed, the recommendations of BS 6701-1 should be applied. NOTE 2The recommendations of BS 6701 and OFTEL Update SA 52 1 will, in general, also apply. 4.3 Electrical characteristics Apparatus shall conform to the requirements of clause 4 of BS 6305:1982, with the exception of 4.4.1. 4.4 Power failure Apparatus shall continue to conform to the requirements specified in 4.1 and 4.2 of BS 6305:1982 for not less than 7 h after failure of the principal power supply, and shall conform to all other requirements of this British Standard for at least 1 h during this period. 4.5 Connection to the PSTN Only one direct PSTN connection shall be permitted for each long range transceiver. Connection to the PSTN shall be by one of the following means: a) solid copper conductors of size between 0.38 mm and 0.65 mm; or b) by a plug conforming to BS 6312:1985. The connected equipment shall conform to the requirements of clause 3 of BS 6305:1982. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:38:36 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7606:1992 2 © BSI 08-1999 4.6 Auto-calling facilities Apparatus incorporating auto-calling facilities shall conform to the requirements of BS 6789-3.1:1985, except that the references to BS 6789-1:1984 shall not apply. Auto-calling shall function in Mode 2 as defined in BS 6789-3.1:1985. Conformity shall be checked by inspection. 4.7 Auto-answering facilities Apparatus incorporating auto-answering facilities shall comply with the requirements of BS 6789-3.2:1987, except that the references to BS 6789-1:1984 shall not apply. Apparatus shall establish the on-line condition after the application of ringing voltage. This shall not apply where call-answer is by means of a handset. Conformity shall be checked by inspection. The apparatus shall conform to 5.2.1 of BS 6789-3.2:1987. 4.8 Line breaks When using loop-disconnect signalling, apparatus shall conform to the requirements of 10.2.2 of BS 6317:1982. 4.9 Speech transmission 4.9.1 Sheltered schemes 4.9.1.1 When apparatus is in the handset telephony mode, it shall conform to the requirements of 13.9 and 13.10 of BS 6317:1982, including amendments. 4.9.1.2 When apparatus is in the loudspeaking mode, it shall conform to the requirements of 7.3, 7.5 and 7.6 of BS 6789-2:1984. 4.9.2 Dispersed schemes 4.9.2.1 Where apparatus is intended to make calls to any network address other than to an alarm receiving station, the requirements given in 4.9.2.2 and 4.9.2.3 shall apply. 4.9.2.2 When apparatus is in the handset telephony mode, it shall conform to the requirements of BS 6317:1982, including amendments. 4.9.2.3 When apparatus is in the loudspeaking mode, it shall conform to the requirements of BS 6789-2:1984, except that references to BS 6789-1 shall not apply. 4.9.2.4 In the event of an alarm call being initiated whilst a call is already in progress to other than an alarm receiving station or the emergency services, the apparatus shall assume off-line conditions and shall then commence its auto-calling pattern. Control shall not be returned to the user until the alarm call has been completed. 4.9.3 Speech interconnection Direct speech transmission either between local units, except when used in conjunction with a master unit, or between speech channels of different dwellings served by a single local unit, shall not be possible. Conformity shall be checked by inspection. Direct speech transmission between a door unit and local units at the same site and between a door unit and an alarm receiving station shall be permitted. 4.10 Instructions for use Instructions for use shall be supplied with apparatus in accordance with 6.2 of BS 6305:1982 and the recommendations of BS 7524:1991. 4.11 Marking Apparatus shall be marked in accordance with clause 5 of BS 6305:1982. 5 Alarm receiving station apparatus 5.1 Application In addition to the requirements given in clause 4, alarm receiving station apparatus shall conform to the requirements given in 5.2. 5.2 Coupling between exchange lines 5.2.1 The insulation resistance between any wire of an exchange line termination and any wire of another exchange line termination provided on the apparatus shall be not less than 5 M7 at 100 V for any state of the system. Conformity to this requirement shall be checked by direct measurement. 5.2.2 When a signal of 7 dBV in the frequency range 200 Hz to 4 kHz is applied to any connection to the PSTN, the resultant signal measured at any other PSTN connection shall not exceed 72 dBV. For test purposes, connection to the specified system shall terminate in the network shown in Figure 5 of BS 6305:1982 and shall use the d.c. excited test circuit shown in Figure 7 of BS 6305:1982. 5.2.3 Apparatus shall not be capable of connecting a PSTN call to any other PSTN call. Conformity to this requirement shall be checked by inspection. 5.2.4 For speech or non-speech apparatus capable of being placed in an on-line state such that all transmission functions or facilities incorporated are suppressed by at least 30 dB, the impedance in that state shall be as specified in 4.3.2.2 of BS 6305:1982 or a value of impedance within the range (270 ± 30) ± j30 7 in the frequency range 200 Hz to 4 kHz and in the apparatus current range given in A.4 of BS 6305:1982. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:38:36 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7606:1992 © BSI 08-19993 Conformity to this requirement shall be checked by measurement of the return loss as described in A.4 of BS 6305:1982. NOTEThis condition may be termed “line hold” or “hold”. 6 Privacy considerations In social alarm systems providing speech facilities, it shall not normally be possible to open a listening channel unilaterally from either end of the system unless an alarm has been initiated from the local unit. Where the special needs of those at risk dictate, but not in areas for use by the general public, systems may be installed which incorporate a facility for an alarm recipient to open a listening channel which shall be subject to the following requirements. a) The occupiers of the protected premises shall be made fully aware by user instruction that such a facility ex