џWPCL ћџ2BJ|xа АH аа АА X агга ХА6p&А6p&Х аеЄ† а Hр аааУ Уб cмˆ4 PŽТ б Fascicle VII.2 Р-Р Rec. U.24 PAGE1 Єее† а HH аааУ Уб cмˆ4 PŽТ бPAGE2 Fascicle VII.2 Р-Р Rec. U.24 еа HH ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаа X  аУ Уб cмˆ4 PŽТ бRecommendation U.24 аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџH јP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаСр86Сб cмˆ4 PŽТ бREQUIREMENTS FOR б cмˆ4 PŽТ бTELEX AND GENTEX OPERATION TO BE MET BY Ср82СSYNCHRONOUS MULTIPLEX EQUIPMENT DESCRIBED IN RECOMMENDATION R.44 аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаСр8HСб cмˆ4 PŽТ бФ ФУУ(Mar del Plata, 1968)ФФ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТа ТThe CCITT,ЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаУУconsidering а H аФФС С(a)СpСthat it may be desirable to use synchronous systems described in Recommendation R.44 in the teleprinter switching networks; а H аС С(b)СpСthat it is essential to transmit the full range of telex signals for types A, B and C signalling; УУunanimously declares the view а H аФФС С(1)СpСthat where it is necessary to receive signals with a nominal cycle of 7 units (see the Recommendation cited in [1]), it will be necessary to insert suitable storage to reconcile the two character rates (400 and 411 per minute); а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџH јP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаС  С(2)СјСthat type A and B signals in accordance with Recommendation U.1 and U.2 and type C signals in accordance with Recommendation U.11 should be accepted for transmission through the synchronous system. However, in the case of type A signalling, the delay between the start of the callР-Рconfirmation signalй$€ callР-Рconfirmation signal$йб cмˆ4 PŽТ б and the proceedР-РtoР-Рselect signalйJб cмˆ4 PŽТ б proceedР-РtoР-Рselect signalJй should be increased to, at least, 150 ms; С  С(3)СјСthat the call signalб cмˆ4 PŽТ бй call signalйб cмˆ4 PŽТ б should be transmitted through the synchronous system with the minimum delay obtainable with the particular method of multiplexing in use, e.g., element interleaving, in order to reduce the incidence of headР-Рon collisionsйAб cмˆ4 PŽТ б headР-Рon collisionsAй with bothР-Рway operation. The maximum delay due to the multiplex equipment should be limited to 60 ms; С  С(4)СјСthat the maximum delay on the callР-Рconfirmation signal due to the multiplex equipment should be 60 ms in the case of type A signallingйaб cмˆ4 PŽТ б type A signallingб cмˆ4 PŽТ бaй, and 120 ms in the case of type B signallingйaб cмˆ4 PŽТ б type B signallingб cмˆ4 PŽТ бaй; аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаС С(5)СpСthat the maximum delay on the start of the receptionР-Рconfirmation signal due to the multiplex equipment should be 60 ms in the case of type C signallingйaб cмˆ4 PŽТ б type C signallingб cмˆ4 PŽТ бaй; С С(6)СpСthat the maximum delay on the proceedР-РtoР-Рselect signal due to the multiplex equipment should be 450 ms in the case of type A signalling, and 120 ms in the case of type B signalling; С С(7)СpСthat the maximum delay on the callР-Рconnected signal due to the multiplex equipment should be 450 ms (type A and type B signalling); С С(8)СpСthat the maximum delay on a teleprinter character due to the multiplex equipment should be 450 ms; С С(9)СpСthat the maximum delay on the clear and clearР-Рconfirmation signals due to the multiplex equipment should be 450 ms; С С(10)Си Сthat the tolerance of the type A and B pulse signals after retransmission through the synchronous multiplex system will be stated below: а H аТа ТТ№ ТС€ Сб cмˆ4 PŽТ бa)СpСУУCallР-Рconfirmation and proceedР-РtoР-Рselect signal Р-Р type B signallingЦЦ а H аТа ТФФТ№ ТThe duration of the pulse after transmission through the synchronous system will not be less than 17.5 ms nor more than 50 ms.ЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџH јP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТX  ТТh ТС€  СТh Тb)УУСјСб cмˆ4 PŽТ бDial pulses Р-Р type B signallingЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТа ТФФТ№ ТУУSpeedФФ Р-Р РР 3% of the mean speed of input measured for digit 0 (normally 9 to 11 pulses per second).ЦЦ Та ТТ№ ТУУRatioФФ Р-Р The duration of stop polarity pulses will not be less than 32 ms; the duration of start polarity pulses will not be less than 44 ms.ЦЦ Т№ ТUnder certain circumstances the retransmitted dial signals may include pulses of stop polarity having durations of up to 73 ms and pulses of start polarity having durations of up to 98 ms. Where this is so and the incoming switching equipment cannot accept pulses with these characteristics a dial pulse regenerator should be inserted between the output of the multiplex circuit and the input of the switching equipment.ЦЦ Та ТТ№ ТС€ Сc)УУСpСService signals for ineffective calls Р-Р type B signallingЦЦ Та ТФФТ№ ТThe duration of the period of stop polarity, whether followed by teleprinter signals or not, will, after transmissions through a synchronous system, be not less than 145 ms and not more than 292 ms.ЦЦ Та ТТ№ ТIf several synchronous systems are placed in tandem, the duration of the period of stop polarity of the service signal at the output of this group of systems should not exceed 440 ms.ЦЦ Та ТТ№ ТAt the input of a synchronous system, a type B service signal will cause the return of a clearР-Рconfirmation signal from the synchronous equipment without waiting for the return of the clearР-Рconfirmation signal from the distant end of the connection. Following the recognition of the clearing signal in the service signal, permanent start polarity will be transmitted over the synchronous system.ЦЦ Та ТТ№ ТС€ Сd)УУСpСCallР-Рconnect Р-Р type A signallingЦЦ Та ТФФТ№ ТThe duration of the pulse of start polarity after transmission through several synchronous systems will be within the limits 140 ms to 160 ms.ЦЦ а HH а‚Ср8OСб cмˆ4 PŽТ бANNEX A Ср8FСб cмˆ4 PŽТ б(to Recommendation U.24) Ср8KСб cмˆ4 PŽТ бTABLE AР-Р1/U.24 б cмˆ4 PŽТ б У УMontage: Reprendre les originaux du Livre RougeФ Ф (sans corr.) ‚Ср8KСб cмˆ4 PŽТ бTABLE AР-Р2/U.24 б cмˆ4 PŽТ б У УMontage: Reprendre les originaux du Livre RougeФ Ф (sans corr.) ‚Ср8KСб cмˆ4 PŽТ бTABLE AР-Р3/U.24 б cмˆ4 PŽТ б У УMontage: Reprendre les originaux du Livre RougeФ Ф (sans corr.) аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџH јP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТX  ТТX јТ‚У УReferenceФ ФЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа[1]Тh  ТCCITT Recommendation УУTransmission characteristics of the load end with its termination (ITA No. 2)ФФ, Rec. S.3, РSР 1.6.ЦЦ