Chapter 9: Planning for and Installing ISDN

ISDN Basic Service

ISDN Basic Service is NYNEX's implementation of the standard BRI. It offers integrated voice, data and video transmission over a single dialed telephone line, as well as the quality and increased data speeds of digital transmission.

It accommodates multiple phone numbers and can carry two simultaneous voice conversations through the same twisted-pair line. It offers such easy-to-use features as hold, three-way conference calls, and call transfer from one phone to another.

ISDN Basic Service can also be used, of course, for dialing to and receiving calls from ordinary voice telephones everywhere, since the digital and analog systems are fully interconnected.

For data, the service offers two 64Kbps clear-channel, circuit-switched digital B channels - capable of bonded speeds of up to 128Kbps before data compression. It also offers a 16Kbps D channel for call signaling and setup, as well as for direct interconnection to the worldwide X.25 packet-switched network.

ISDN Basic Service uses standard 1MB, 1MR or Intellipath lines, and is fully compatible with other NYNEX digital services. It can be readily interconnected to AT&T, MCI, Sprint and other IECs to make long distance ISDN channels for global applications.

Lines can be linked directly from the NYNEX local office to the user's desktop, or can be linked to a company's PBX so that dialed ISDN connections can be used within the company.

Other Sections Of This Chapter:

Beginning Of Chapter 9
The Movement Towards Unity
NYNEX ISDN Services
ISDN Basic Service
ISDN Intellipath
ISDN Primary Service
ISDN Equipment
Wiring For ISDN
Getting Started Now