1021 Category 3, Type G - Dedicated High Capacity Digital (1.544 Mbps) BSA

Category 3 - Dedicated Basic Serving Arrangement

A dedicated BSA provides an ESP with a dedicated point-to-point connection 
through the network.  This category of serving arrangements are available 
full-time so that individual calls are not set up and taken down.  This BSA 
is capable of supporting analog or digital signals at various transmission 
rates.  The transmission interface may be 2-wire or 4-wire, or derived from a 
variety of multiplexing alternatives (e.g., DS-1 or DS-3).  It is also capable 
of providing supervisory signaling in some configurations. 

Route diversity may be available with this serving arrangement.

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Category 3, Type G - Dedicated High Capacity Digital (1.544 Mbps) BSA

The dedicated high capacity digital (1.544 Mbps) BSA provides an ESP with a 
dedicated channel.  This serving arrangement provides for transmission of 
isochronous digital signals at a transmission speed of 1.544 Mbps.  This BSA
may extend between customer terminal locations or between a customer's terminal
location and a BOC designated HUB office where multiplexing is offered. 

In some cases, this BSA can be provisioned for dedicated transport of Extended 
Superframe (ESF) data channel capability. 

Generic Name of BSA
 	Regional Company BSA Name
==========================================================================
Category 3, Type G - Dedicated High Capacity Digital (1.544 Mbps) BSA
	AM - Direct High Capacity Digital (1.544 Mbps)
     	BA - High Capacity Digital Service
     	BS - MegaLink(R)/HiCap
     	NX - Dedicated Digital - 1.544 Mbps
     	PB - High Capacity Services (1.544 Mbps)
     	SWB - Special Access - High Capacity (1.544 Mbps)
     	USW - DS1 Service

MegaLink is a registered service mark of BellSouth Corporation.

Reference:  Publication PUB 62508 (also listed as MDP 326-027) High Capacity 
Digital Special Access Service Transmission Parameter Limits and Interface 
Combinations, Issue 1, December 1983.  Also see TR-NPL-000054 High Capacity 
Digital Service (1.544 Mbps) Interface Generic Requirements for End Users, 
Issue 1, April 1989.  Also see TR-TSY-000312 Functional Criteria for the DS1 
Interface Connector, Issue 1, March 1988.  
Also see Ameritech document AM-TR-OAT-000033, DS1 Customer Installation: 
Metallic Interface, Issue B, January 1990.
Also see Pacific Telesis technical reference PUB L-780021-NP/NB Requirements 
and Objectives for High Capacity Digital Services (1.544 Mbps) Network Interface
Equipment, September 1987.
Also see U S WEST engineering publication 77327 Digicom III High Capacity
Digital Access Service "Joint Designed: Network Channel Interface, December
1988.
