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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : F.73
Title : Operational principles for communication between terminals of
the international telex service and data terminal equipment on
packet switched public data networks
Study Group : I - Services
Version : Revised
Date of adoption : 1990
Notes : Corrigendum 12/90
The procedures defined in Recommendation F.73 enable telex subscribers
to communicate with both packet mode and character mode data terminal
equipment (DTE) connected to the PSPDN directly or via other networks.
In the reverse direction, the provisions of Recommendation F.73 enable
users of packet mode and character mode DTEs, connected to a PSPDN
directly or via other networks, to communicate with telex subscribers.
Recommendation F.73 applies to user classes 8-13 and 20-23 as defined
in Recommendation X.1. Categories of access for DTEs accessing the
PSPDN are shown in Recommendation X.10.
Recommendation F.73 does not apply to other Telematic services that
may be supported by packet switched public data networks and
interworking with the telex service.
For example, interworking between the telex service and the teletex
service or the interpersonal messaging service is not within the
scope of Recommendation F.73. Such interworking scenarios are defined
in other Recommendations.
Call establishment from a telex terminal via a PSPDN to a
character-mode DTE connected to the public switched telephone network
(PSTN) requires further study.
Recommendation F.73 defines an interworking model and sets out the
principles applicable to call set-up procedures and to the text
transfer phase.
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: UPI=ITU-5265; ASCII: UPI=ITU-2488).