ITU-T X.57-1988
在64kbit/s数据流中单个低速数据信道的传输方法

METHOD OF TRANSMITTING A SINGLE LOWER SPEED DATA CHANNEL ON A 64 kbit/s DATA STREAM

作废

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标准号

ITU-T X.57-1988

发布

1988年

发布单位

国际电信联盟

 

 

引用标准

ISO/IEC 14608-1:1996 ISO/IEC 7498-1: 1994 ISO/IEC 8650-2:1995 ISO/IEC 9072-4 ISO/IEC 9594-1:1990 ISO/IEC 9646- 1:1994 ISO/IEC 9646-7:1995 ITU ITU-T X.200-1994 ITU-T X.247-1994 ITU-T X.249 ITU-T X.290-1999 ITU-T X.296-1993 ITU-T X.500-1988 ITU-T X.581-1995

适用范围

The CCITT, considering (a) that the Recommendation X.1 defines the synchronous user classes of services to be provided by a publicdata network; (b) that Recommendation X.50 defines some envelope data formats which can be used in public data networks; (c) that the use of a full 64 kbit/s data stream for the transmission of a single lower speed synchronous data channel may be economically attractive in some applications, when a low cost 64 kbit/s channel is available; (d) that for customer access to circuit switched data services in the ISDN, a method for adaption of synchronous user data rates to a 64 kbit/s bearer rate is defined in Recommendation X.30, but that in certain applications as mentioned under (c) a simpler method is preferred.

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