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Fig. <strong>11</strong> gnalling for setting up a call between two ARB subscribers when the connection passes ough two transit centres ARM TxA A-subscriber's teleprinter and control unit TxB B subscriber's teleprinter and control unit A A-suhscribcr's line (single current) B C D E T K Z Trunk circuit between ARB and ARM Trunk circuit between the two transit centres ARM Trunk circuit between ARM and ARB B subscriber's line (single current) A-subscriber's tariff zone A-subscriber's class Tariff information signal 1 Procecd-to-select signal 1 Selection information, i.e. B subscriber's number 3 B-subscriber's number preceded by A subscriber's class K 4 The last three digits of the B subscriber's number and the class K of the A subscriber 5 Time signal 6 Answer-back trip signal B subscriber's answer-back Nl, N2 etc B subscriber's number 14
The procedure for calling, transmission of proceed-to-select signal GA, tariff zone (T), class (K) and tariff information (Z) has been described above. After receipt of B-number information from TxA the connection is set up through the transit centre {AKM) to a repeater on the route concerned. The signals for calling transit centre no. 2, call-confirmation and proceed-to-select signals are Type B. Digit transmission between the registers is done with teleprinter signals and the digits are preceded by the A subscriber's class signal. All five digits arc transmitted. The procedure is repeated through transit exchange no. 2. But only the last three digits, preceded by the class, are transmitted to the terminal exchange code receiver. The signalling on an in<strong>com</strong>ing subscriber line has been described earlier. Finally it may be mentioned that the signalling diagram shows clearing by the A subscriber, which is the normal practice. Signalling for Outgoing Semiautomatic International Traffic The signalling diagram in fig. 12 shows the signalling on the chain of circuits TxA-AERB-ARM-international exchange in another country for semiautomatic international traffic. Fig. 12 Type B signalling on the chain of circuits A subscriber — terminal exchange ARB-transit centre ARM — international centre in an other country for semiautomatic international call from the A subscriber TxA A-subscriber's teleprinter and control unit Subscriber's line, single current Trunk circuit between ARB and ARM exchanges International circuit A-subscriber's tariff zone A-subscriber's category Proceed-to-select signal Access code for semiautomatic traffic Wait signal Exchange and operator identity signal and answer-back trip signal A-subscriber's answer-back with his number Proceed-to-select signal International number containing destination code, B subscriber's national number and +, which indicates end of selection 8 Dial transmission of B subscriber's national number 9 Answer-back trip signal 10 B subscriber's answer-back 15
Page 1: 1 1968
Page 4 and 5: Stored Program Controlled Telephone
Page 6 and 7: Signalling in L M Ericsson Telex Sy
Page 8 and 9: On physical subscriber lines other
Page 10 and 11: In a new Recommendation U 11, CCITT
Page 12 and 13: Automatic Tripping of B Subscriber'
Page 14 and 15: egister in ARM selects a new circui
Page 16 and 17: show the signalling both for single
Page 20 and 21: In this case, after receipt of the
Page 22 and 23: Similar intervvorking exists with t
Page 24 and 25: The capital cost of the telex syste
Page 26 and 27: Fig. 1 Traffic distribution by dist
Page 28 and 29: Fig-3 Charging principles Zone char
Page 30 and 31: Transmission Considerations The obj
Page 32 and 33: A variety of special subscriber mar
Page 34 and 35: to be tripped. The calling subscrib
Page 36 and 37: References 1. C.C.T.T. Illrd Plenar
Page 38 and 39: Corrugating Machine The aim in the
Page 40 and 41: Laying The corrugated duct may have
Page 42 and 43: New Factory Opened at Ostersund L M
Page 44 and 45: Dirivox and Centrum in the Soviet U
Page 46: The Ericsson Group Associated and c

11 - ericssonhistory.com

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