Telephonic or telegraphic switching apparatus

85.17 - Telephone sets, including telephones for cellular networks or for other wireless networks; other apparatus for the transmission or reception of voice, images or other data, including apparatus for communication in a wired or wireless network (such as a local or wide area network), other than transmission or reception apparatus of heading 84.43,85.25,85.27 or 85.28 (+). - Tel hone sets, including telephones for cellular networks or for other wire ess networks : 7' - - Line telephone sets with cordless handsets 8517.12 - - Telephones for cellular networks or for other wireless networks 8517.18 - - Other 8517.11 - Other apparatus for transmission or reception of voice, images or other data, includin apparatus for communication In a wired or wireless network (such as a loca or wide area network) : f - - Base stations 85 17.62 - - Machines for the reception, conve~sionand transmission or regeneration of 85 17.61 voice, images or other data, includmg switching and routing apparatus - - Other 8517.70 - Parts 8517.69 This heading covers apparatus for the transmission or reception of speech or other sounds, images or other data between two points by variation of an electrtc current or optical wave flowing in a wired network or by electro-ma etic waves in a wireless network. The signal may be analogue or di ital. The networks, w ch may be interconnected, include te ephony, telegraphy, radio-te ephony, radio-telegraphy, local and wide area networks. i: E (I) TELEPHONE SETS, INCLUDING TELEPHONES FOR CELLULARNETWORKS OR FOR OTHER WINLESS NETWORKS This group includes : (A) Line telephone sets. Line telephone sets are communication apparatus that convert voice into si transmission to another device. Upon receipt of a signal, a line telephone set wiWlalS convert the signal back to voice. They consist of : (1) The transmitter, a microphone which converts sound waves into a modulated current. (2) The receiver (headphone or earphone), which reconverts the modulated current into sound waves. In most cases, the transmitter and receiver are incorporated in a single moulding known as a hand-set. In other cases the transmitter and receiver are a combined headphone and microphone, designed to be worn on the user's head. (3) The anti-sidetone circuit, which prevents sound introduced in the transmitter from being reproduced in the receiver of the same hand-set. (4) The ringer, which gives warning of a call. These ma be tone ringers which produce their sound electronically or mechanical rin ers suc as a bell or a buzzer. Some telephone sets incorporate a light or lamp whic operates in conjunction with the ringer to provide a visual signal indicating an incoming call. Z % (5) The switching device or "switchhook", which interrupts or permits the flow of current from the network. It is usually operated by the hand-set being removed from or returned to a cradle. (6) The dialling selector, which enables the caller to obtain a connection. The selector may be of the push-button or keypad (tone) type or of the drum or rotary (pulse) type. When separate1 presented, microphones and receivers whether or not combined as handsets), and lou speakers are classified in heading 8 .18 while bells and buzzers are classified in heading 85.31. d' The heading covers all kinds of telephone sets including : (i) Cordless telephone sets which corn rise a battery powered radio fiequency transceiver hand-set which incorporates a dialEng selector, switching ke and a ra&o frequency transceiver base unit which is connected by line to the te ephone network (other cordless telephone sets may not have hand-set but comprise a combined headphone and microphone which is connected to a ortable combined battery powered radio frequency transceiver, dialling selector an switching key). T f (ii) Telephone sets which comprise a combined diallin selector and switching key unit (which is connected b line to the telephone networ ) and a combined headphone and rmcrophone, presente together. l E (B) Telephones for cellular networks or for other wireless networks. This group covers telephones for use on any wireless network. Such telephones receive and emit radio waves which are received and retransmitted, e.g., by base stations or satellites. These include, inter alia : (I) Cellular phones or mobile phones. (2) Satellite phones. (11) OTHER APPARATUS FOR TRANSMISSION OR RECEPTION OF VOICE, IMAGES OR OTHER DATA, INCLUDING APPARATUS FOR COMMUNICATION IN A WIRED OR WIRELESS NETWORK (SUCH AS A LOCAL OR WIDE AREA NETWORK) (A) Base stations. The most common types of base stations are those for cellular networks, which receive and transmit radio waves to and from cellular telephones or to other wired or wireless networks. Each base station covers a geographical area (a cell). If the user moves from one cell to another while telephoning, the call is automatically transferred from one cell to another without interruption. (B) Entry-phone systems. These systems usually consist of a telephone handset and ke ad or a louds eaker, a microphone and keys. These systems are usually mounted at e entrance of uildings housing a number of tenants. With these systems, visitors can call certain tenants, by pressing the appropriate keys and talk to them. i (C) Videophones. Videophones for buildings, which are a combination consisting principally of a telephone set for lime telephony, a television camera and a television receiver (transmssion by hne). @) Apparatus for telegraphic communication other than facsimiIe machines of heading 84.43. These apparatus are essentially designed for converting characters, paphics, images or other data into appropriate electrical impulses, for transmitting those impulses, and at the receiving end, receiving these impulses and converting them either lnto conventional bols or indications representing the characters, aphics, images or other data or into rcharacters, graphics, images or other data themse ves. f= Examples are : (I) Apparatus for transmitting messages, such as dial or keyboard transmitters and automatic transmitters (e.g., teleprinter or teletypewriter transmitters). (2) Apparatus for receiving messages (e.g., teletypewriter receivers). In some cases the receiver and the transmitter apparatus are combined into one receiver-transmitter. (3) Picture telegra hic apparatus. The ancillary hotogra hic equipment used with this apparatus (e-g., evelopig equipment) falls in hapter 0. # (E) Telephonic or Telegraphic Switching Apparatus. (1) Automatic switchboards and exchanges. These are of many types. The key feature of a switching system is the ability to provide, in response to coded si als, an automatic connection between users. Automatic switchboards and exc anges may o erate by means of circuit switching, message switching or packet switching whic utilize microprocessors to connect users by electronic means. Many automatic switchboards and exchanges incorporate analogue to di ital converteis, digital to analogue converters, &ta compression/decom~ression evices (codecs). modems. multiulexors. automatic data recessing machine's and other devices that 'permit the simulianeous' transmission of goth analogue and digital signals over the network, which enables the integrated transmission of speech, other sounds, characters, graphics, images or other data. !El R Some types of automatic switchboards and exchanges consist essentially of selectors, which select the line comes onding to the impulses received fiom the callin sets and are o erated automatically, either directg by the establish the connection. impulses from the calling set or via auxiiiay apparatus such as directors. hey The different types of selectors (pre-selectors, intermediate selectors, final selectors) and, where used, the directors, are often assembled in series and in groups of the same type on chassis which are then incorporated into the exchan e on metal racks. Particularly in smaller-sized installations they may, however, a be mounted on a single rack to form a self-contained automatic exchange. Pi Automatic switchboards and exchan es may also incorporate such facilities as abbreviated dialling, call waitin , call orwardmg, multi-party calling, voice mail, etc. These facilities are accessed rom the user's telephone set through the telephone network. f f They are used for the public network or for rivate networks that utilise a private branch exchange (PBX) which is connectel to the public network. Automatic switchboards and exchanges may also be equipped with consoles similar to telephone sets for when intervention or service by an operator is required. (2) Non-automatic switchboards and exchanges. These consist of a frame on which are mounted the various manual switchin devices. They require an operator to manually connect each call received by the switc board or exchange. They comprise "call" or "clear" indicators for sipalling that a call is being made or is completed; operators' tele hone sets (sometimes specially mounted); switching devices (mounted jacks or soc ets and plugs connected to a cord); and key switches electrically connected to the plu s and cords to enable the operator to answer the caller, supervise the progress of the ca 1 and note its completion. f~ ! f (F) Transmitting and receiving apparatus for radio-telephony and radiwtelegraphy. This group includes : (I) Fixed apparatus for radio-telephony and radio-telegraphy (transmitters, receivers and transmitter-receivers). Certain types, used mainly in large installations, include special devices such as secrecy devices (e.g., spectrum mverters), multiplex devices (used for sending more than two messages simultaneously) and certain receivers, termed "divers~tyreceivers", using multiple receiver technique to overcome fading. (2) Radio transmitters and radio receivers for simultaneous interpretation at multilingual conferences. (3) Automatic transmitters and special receivers for distress signals from ships, aircraft, etc. (4) Transmitters, receivers or transmitter/receivers of telemetric signals. (5) Radio-telephony apparatus, including radio-telephony receivers, for motor vehicles, ships, aircraft, trains, etc. (6) Portable receivers, usually battery operated, for example, portable receivers for calling, alerting or paging. (G) Other communication apparatus. This group includes a paratus which allows for the connection to a wired or wireless communication networ or the transmission or reception of speech or other sounds, images or other data within such a network. 1: Communication networks include, inter alia, carrier-current line systems, digital-line systems and combinations thereof. The may be confi ed, for exam le, as public switched tele hone networks, Local Area ehvorks ( ~ ~ N $ P I ~ e t r o ~ o l i tea a nNetworks (MAN) and ide Area Networks (WAN), whether proprietary or open architecture. ;e K A: This group includes : (1) Network interface cards (e.g., Ethernet interface cards). (2) Modems (combined modulators-demodulators). (3) Routers, bridges, hubs, repeaters and channel to channel adaptors. (4) Multiplexers and related line equipment (e.g., transmitters, receivers or electro-optical converters). (5) Codecs (data compressors/decomp~essors)which have the capability of transmission and reception of digital information. (6) Pulse to tone converters which convert pulse dialled signals to tone signals. PARTS Sub'ect to the general provisions regarding the classification of parts (see the General Exp anatory Note to Section XVI), parts of the apparatus of this heading are also classified here. The heading also excludes : (a) Facsimile machines (heading 84.43). (b) Perforating machines, whether or not electric, used to perforate paper bands ready for use in automatic telegraphic apparatus (heading 84.72). (c) Induction coils for insertion in telephone or telegraph line circuits (heading 85.04). (d) Cells, batteries and accumulators (heading 85.06 or 85.07). (e) Telephone answering machines designed to operate with a telephone set but not forming an integral part of the set (head~ng85.19). (f) Apparatus for the transmission or reception of radio-broadcasting or television signals (headings 85.25,85.27 or 85.28). (g) Electric bells or indicators (e.g., luminous indicators operated by the dial of a telephone) (heading 85.31). (h) Relays and switching equipment, such as selectors for automatic telephone exchanges, of heading 85.36. (ij) Insulated electric wire, cable, etc., as well as optical fibre cables, made up of individually sheathed fibres, whether or not fitted with connectors, including cords with plugs for switchboards (heading 85.44). (k) Telecommunication satellites (heading 88.02) (1) Telephone call registers and counters (Chapter 90). (m) Carrier-current and other transmitters and receivers which form a single unit with analogue or digital telemetering instruments or apparatus, or which, together with the latter, constitute a functional unit within the meaning of Note 3 to Chapter 90 (Chapter 90). (n) Calculographs (time recorders) (heading 91.06).

Subheading Explanatory Note. Subheading 8517.62 This subheading includes cordless handsets or base units, when presented separately. -