1034 Secondary Channel Capability

The secondary channel feature provides the customer with access to a low speed 
monitoring channel associated with a primary dedicated digital private line
channel.  The secondary channel simultaneously transmits at a lower bit rate.

Generic Name of ONA Service
 	Product Name				BSE or CNS
===========================================================================
Secondary Channel Capability
	AM - Secondary Channel			BSE
	BA - Secondary Channel			BSE
	BS - Secondary Channel Capability	BSE or CNS
	NX - Diagnostic Channel On DS0 Lines	BSE
	PB - Secondary Channel			BSE 
	SWB - Secondary Channel Capability	BSE 
	USW - Secondary Channel			BSE

FEATURE OPERATION:
The secondary channel capability offers a companion digital transmission
channel independent of the primary channel and at a lower bit rate.

The basic dedicated digital private line offers two-point and multi-point
synchronous full duplex data transmission at 2.4 Kbps, 4.8 Kbps, 9.6 Kbps
and 56 Kbps.  Secondary channel data transmission rates are subrates of the
basic dedicated digital private line speeds, i.e., 133 bps, 266 bps, 533 bps 
and 2.666 Kbps.  The secondary channel will utilize the same basic network
equipment and transmission facilities as the primary channel and will
have comparable quality.

A 2-point circuit connects two customer stations in a balanced mode of 
operation.

From different remote stations on a multipoint circuit, transmission on the 
primary and secondary channels are independent of each other, that is, a remote
station can communicate with the control station on the primary channel while 
another station simultaneously transmits on the secondary channel to the 
control station.

TECHNOLOGICAL AND FEATURE INTERACTION CONSIDERATIONS:
1. The customer's overall performance will depend on the characteristics of the
   CPE and customer premises cabling that is provided and maintained by the 
   customer, as well as those of the DDS network.  These performance objectives
   are attainable if the CPE connected to the DDS network meets the requirements
   of TR-NPL-000157.

2. Due to use of the same network equipment and transmission facilities
   for related primary and secondary channels, the quality of the related
   channels should be approximately equal.

3. Multipoint capability may not be available in all locations.

4. References:
   o TR-NPL-000157 Secondary Channel in the Digital Data System: Channel
     Interface Requirements, Issue 2, April 1986.

This service, if offered as a BSE, is associated with the Dedicated Digital
(< 64 kbps) basic serving arrangement.
