Nortel BCM 3.7, Manual

Page: 875 / 1004

ISDN Programming 875
Programming Operations Guide
D-packet Service (BRI only)
The D-packet service supplied by the Business Communications Manager system supports a
point-of-sale terminal adapter (POSTA). Connecting a POSTA allows transaction terminals
(devices where you swipe credit or debit cards) to transmit information using the D channel of the
BRI line, while the B channels of the BRI line remain available for voice and data calls. A special
adapter links transaction equipment, such as cash registers, credit card verification rigs, and
point-of-sale terminals, to the X.25 network, which is a data communications network designed to
transmit information in the form of small data packets.
To support the D-packet service, your ISDN network and financial institution must be equipped
with a D-packet handler. To convert the protocol used by the transaction equipment to the X.25
protocol, your ISDN network must also be equipped with an integrated X.25 PAD which works
with the following versions of X.25: Datapac 32011, CCITT, T3POS, ITT and API. The ISDN
service package you order must include D-packet service (for example, Package P in the United
States; Microlink™ with D-channel in Canada).
Your service provider supplies a Terminal Endpoint Identifier (TEI) and DN to support D-packet
service. The TEI is a number between 00 and 63 (in Canada, the default range is 21-63). Your
service provider may also supply you with a DN to program your D-packet device. The DN for
D-packet service becomes part of the dialing string used by the D-packet to call the packet handler.