1013 Preselection for Data Services

Preselection for Data Services is an optional CCITT defined Public Packet
Switched Network (PPSN) per call subscription feature that provides the
user with the ability to select a preferred Interconnect Carrier (IC)
on internetwork/interLATA calls.  This feature will automatically select
an IC when the calling DTE (Data Terminal Equipment) does not identify the
Data Network Identification Code (DNIC) of the called IC in the Recognized
Private Operating Authority (RPOA) field.  

Generic Name of ONA Service 	Product Name			BSE or CNS
===========================================================================
Preselection for Data Services	BA - RPOA Preselection		BSE or CNS
                              	BS - RPOA Preselect		BSE or CNS
                              	NX - RPOA Preselection		CNS or BSE
                              	PB - IC/VAN Preselection	BSE or CNS
                              	SWB - RPOA Preselection		CNS

FEATURE OPERATION:
The PPSN Access Concentrator (AC) and ISDN Packet Handling Facility (PHF) should
provide the capability for an originating DTE user to select a preferred IC at 
subscription.  The AC and PHF should access the preselected DNIC/INIC from the 
subscriber's profile and route the call to the IC over an X.75 interface.

TECHNOLOGICAL AND FEATURE INTERACTION CONSIDERATIONS:
1. The PPSN AC should support asynchronous and X.25 direct or dialup interfaces.

2. The ISDN PHF should support X.25 direct interfaces.

3. References:
   o PPSNGR TR-TSY-301, Issue 2, December 1988, Sections 3.2.6.18, 3.54.1
     and Tables B15 and B16.

This service, if offered as a BSE, is associated with the Packet Switched X.25 
and X.75 basic serving arrangements.
