INTERNATIONAL  TELECOMMUNICATION  UNION

		     ITU-T RECOMMENDATION SUMMARY


Rec. No. : F.150

Title :	Service and operational provisions for the intex service

Study Group : I - Services

Version : New

Date of adoption : 1991

Notes :	


With the continuing development of the infrastructures of the networks 
which currently support, amongst others, the international telex 
service, it is feasible that some of these networks could support 
other services operating at speeds in excess of 50 bauds and using 
character sets other than those of International Telegraph Alphabet 
No. 2 (ITA2). 

There may be benefits to both customer and Administrations if a new 
text service could be introduced that would utilize the same network 
infrastructure as the international telex service.

Recommendation F.150 sets out the service and operational principles 
for the introduction of a new text service, initially operating 
asynchronously at 300 bit/s and using International Alphabet No. 5 
(IA5).

This service will be real-time circuit switched and provide 
asynchronous operation with a basic transmission rate of 300 bit/s. 
The use of other transmission rates at a future date is for further 
study. The service will be half-duplex in its normal mode but will 
allow for full duplex operation in the transparent mode. The Intex 
service will use the destination codes detailed in Recommendation F.69. 
It is recommended that the national numbering scheme for the Intex 
service be similar to and compatible with that used for the 
international telex service.



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