The procedures defined in
this Recommendation 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 this Recommendation enable users of packet mode and character mode DTEs,
connected to a PSPDN directly or via other networks, to communicate with telex
subscribers. This Recommendation 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. This Recommendation 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 this Recommendation. Such
interworking scenarios are defined in other Recommendations.