ITU-T F.24-1988 电路交换公众电报业务中国与国之间的平均服务等级(GOS) Average grade of service from country to country in the gentex service

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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 !6%2!'% '2!$% /& 3%26)#% &2/- #/5.429 4/ #/5.429 ). 4(% '%.4%8 3%26)#% )45 4 Recommendation & (Extract from the "LUE "OOK) & NOTES 1 ITU-T Recommendation F.24 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.24 Fascicle II.4 - Rec. F.24 AVERAGE GRADE OF SERVICE FROM COUNTRY TO COUNTRY IN THE GENTEX SERVICE The CCITT, considering (a) that Recommendation F.23 gives a recommended grade of service for groups of long-distance international circuits used in the gentex service but; (b) that it would be helpful for outgoing countries to be certain that the gentex calls can be put through with a loss probability sufficient to maintain the grade of gentex service without delay working; (c) that small offices connected to the gentex network cannot ensure, at the incoming end, a very high grade of service, otherwise their equipment would be uneconomically used; (d) that it is sufficient for an outgoing country to be able to count on an average grade of service for all gentex calls to a given incoming country, unanimously declares (1) that it is helpful to define an average grade of service between countries for gentex calls; (2) that this grade of service should be expressed as the proportion of calls that reach the incoming country participating in the gentex service, but that fail to get through to its gentex stations; and (3) that this grade of service should not involve more than an average of 1 lost call in 10 during the busy hour on a normal day. Calls routed to an overflow position are considered as successful calls. Fascicle II.4 - Rec. F.24 1

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