ITU-T F.31-1988 电报重发系统 Telegram retransmission system

pdf标准 ITU-T F.31-1988 电报重发系统 Telegram retransmission system

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ITU-T F.31-1988 电报重发系统 Telegram retransmission system 第 1 页 ITU-T F.31-1988 电报重发系统 Telegram retransmission system 第 2 页 ITU-T F.31-1988 电报重发系统 Telegram retransmission system 第 3 页 ITU-T F.31-1988 电报重发系统 Telegram retransmission system 第 4 页 ITU-T F.31-1988 电报重发系统 Telegram retransmission system 第 5 页
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INTERNATIONAL TELECOMMUNICATION UNION )45 4 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU /0%2!4)/.3 !.$ 15!,)49 /& 3%26)#% 4%,%'2!0( 3%26)#%3 4%,%'2!- 2%42!.3-)33)/. 3934%)45 4 Recommendation & (Extract from the "LUE "OOK) & NOTES 1 ITU-T Recommendation F.31 was published in Fascicle II.4 of the Blue Book. This file is an extract from the Blue Book. While the presentation and layout of the text might be slightly different from the Blue Book version, the contents of the file are identical to the Blue Book version and copyright conditions remain unchanged (see below). 2 In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. © ITU 1988, 1993 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. Recommendation F.31 Fascicle II.4 - Rec. F.31 TELEGRAM RETRANSMISSION SYSTEM (a) For the routing of telegram traffic, Administrations can use the Telegram Retransmission System. This system comprises a network of interconnected telegram retransmission centres, which carry out the switching and retransmission functions. The indications needed to route the telegram are included with the telegram when it enters the system and are retransmitted with the telegram from one centre to another. (b) The offices where telegrams enter or leave the telegram retransmission system are linked to at least one retransmission centre; such offices are described as linked offices. In the case of a particular telegram, the linked office through which the telegram enters the system is known as the linked entry office; the linked office through which the telegram leaves the system is known as the linked exit office. (c) The present Recommendation has been drawn up for fully automatic working, but may be used for semiautomatic and manual working. (d) To facilitate world-wide operation of the telegram retransmission system, to simplify the transfer of telegrams between the retransmission network and other networks and to enable the switching and accounting equipment needed for the retransmission centres to be designed, the CCITT, unanimously declares that 1 Each telegram must be treated independently, even if several telegrams for the same destination arrive in series at a linked entry office. 2 The format to be used in preparing the telegram for transmission shall be as follows: 2.1 The heading of the telegram shall start with the numbering line preceded by a carriage-return, a line-feed and a letter-shift. The numbering line consists of: 2.1.1 The start-of-message signal (SOM) In accordance with Recommendation F.30 the start-of-message signal (SOM) is made up by the sequence of combinations Nos. 26, 3, 26, 3 of International Telegraph Alphabet No. 2 (ZCZC) followed by: 2.1.2 The channel sequence number Telegrams transmitted over a channel shall be numbered according to a series of numbers for each channel. The channel sequence number will therefore be composed of three letters characteristic of the channel used (channel indicator) followed by a number showing the order of this telegram in the series sent over this channel. The channel sequence numbers shall be in sequence from 001 to 999 and change automatically from 999 to 001 at the end of a numbering cycle. When the telegram passes from one channel to another in a network, each new channel sequence number shall be inserted immediately after the start-of-message signal. The channel sequence numbers will appear in the numbering line of the telegram in the opposite order to that in which the telegram passed through the network. The channel sequence number shall be transmitted as: − space; − three letters constituting the channel indicator; − figure-shift; − three figures constituting the number in the series on the channel. Service advices will be numbered in the channel series unless agreed otherwise by the Administrations concerned. The channel sequence number(s) is followed by: Fascicle II.4 - Rec. F.31 1 2.1.3 The telegram identification group (TIG) The telegram identification group enables the office of origin to recognize the telegram. This group must not exceed 15 printing characters, which may be composed of any combination of letters and/or figures. In the special case of a telegram from the gentex network to the telegram retransmission system, the telegram identification group will be the only reference in the numbering line and will consist of two letters identifying the originating country or a particular network therein (in accordance with Recommendation F.96), the call num

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