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1994-11-05
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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : T.90
Title : Characteristics and protocols for terminals for telematic
services in ISDN
Study Group : VIII - Terminals for Telematics Services
Version : Revised
Date of adoption : 1992
Notes :
Recommendation T.90 defines the functional profile for base standards
ISO/IEC 7776, 8208 and 8885 to provide the lower layers of the
telematic services protocol stack when operating on the ISDN.
Parameter values are recommended to ensure good throughput when
operating via long delay connections such as satellite routes. Backward
compatibility with the Blue Book version has been maintained.
Three methods of negotiating the lower layer parameter values have
been included to satisfy various connection scenarios, e.g. completely
within the ISDN or between the ISDN and other digital networks.
Recommendation T.90 supplies the network layer definition in
Recommendation T.70 for telematic terminals but not the transport
layer definition which is still retained as the telematic transport
layer definition.
To order the complete text of this Recommendation, please use the
Order Form for ITU-T Recommendations. An electronic version of this
form is available on ITUDOC (Winword 2.0: UPI=ITU-5265; ASCII: UPI=ITU-2488).