1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 2 TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU4%,%2!0(94%,%2!0(G0G042!.3-)33)/.$%3).!4)/.G0G0/amended at Arnhem, 1953, Mar del Plata, 1968and Malaga-Torremolinos, 1984)The CCITT,unanimously declares the viewthat international telegraph circuits should be
2、 designated:(1) first, by the localities of terminal offices, arranged in alphabetical order according to the spelling of thecountry;(2) by an indication of the service using the circuit according to the following table:a) public telegram service circuit:i) point-to-point circuit or circuit used for
3、 messages switching: TGii) trunk circuit of the public switching network (gentex): TGXiii) subscribers line from a telegraph office to its switching equipment: TGAb) telex circuit (including circuits common to the telex and gentex services): TXc) special circuits for private or special services:i) p
4、oint-to-point circuit or circuit used for message switching: TGPii) switched circuit or multi-point network circuit (broadcasting network, conference, circuits): TXPd) service circuits:i) point-to-point circuit: TSii) omnibus or selective ringing circuit section: TXSiii) pilot channel for voice-freq
5、uency telegraph systems: TT(3) by a serial number, using a separate continuous series for each group of circuits.Note To avoid confusion in the case of TGP and TXP circuits, the designation originally assigned to a leasedcircuit should not be reassigned to a new circuit until a period of at least two years has elapsed.
