1025 Category 4 - Dedicated Network Access Link BSA

The dedicated network access link (DNAL) BSA provides a dedicated data channel 
between the ESP's termination and a designated central office which contains the
specific features required by the ESP.  The DNAL is used to transmit network 
information or network control information from the ESP to the network (e.g., 
activate a message waiting indicator), or to deliver network information or 
network control information from the network to the ESP (e.g. calling number 
identification over a message desk interface).  The type of DNAL BSA used will 
determine the bandwidth alternatives and capabilities available to the ESP.
The DNAL BSA can support one-way or two-way transmission depending on the 
alternatives used.

Route diversity may be available with this serving arrangement.

Generic Name of BSA
 	Regional Company BSA Name
==========================================================================
Category 4 - Dedicated Network Access Link BSA
	AM - Dedicated Network Access Link
	BA - Dedicated Network Access Link
	BS - Private Line/Special Access
	NX - (see NYNEX note)
	PB - Series 3000 Channels
	SWB - Special Access - Metallic
	SWB - Special Access - Voice Grade
	USW - Analog PLS

Note: NYNEX offers dedicated channels for specific network information or
network control information as part of the appropriate BSA or BSE that
provides the specific capability.

Reference:  TR-NPL-000335 Voice Grade Special Access Service - Transmission
Parameter Limits and Interface Combinations, Issue 1, June 1986, Revision 1,
February 1987, Revision 2, November 1987.  TR-NPL-000336 Metallic and
Telegraph Grade Special Access Services - Transmission Parameter Limits
and Interface Combinations, Issue 1, October 1987.
