Customers who have an installed base of proprietary digital PBXs
will be able to migrate to IP-based systems such as the Cisco IP-PBX, while maintaining the investment they have already made in proprietary PBX phones, wiring, and fault tolerant power systems.
3 Digital PBX
systems, wireless PBX, design and $12 million to
Dual T1 interfaces can accommodate future bandwidth requirements, connections to digital PBX
T1s, and can provide T1 protection for endusers' mission-critical voice and data applications.
For voice communications, debis Systemhaus uses the IPX switch to integrate its digital PBX
network via an ISDN interface.
While performing an analysis related to the integration of Audix to our PBX, it became apparent that we would receive additional benefits with a modern digital PBX
. Since we were reducing our expenses with voice mail, we were able to upgrade our existing AT&T Dimension PBX to a Definity Communications System Generic 2.
Willmott expects that within three years he will need to add a new digital PBX
at a cost between five and eight million dollars to replace the existing system and initially configured to handle approximately 20,000 telephones.
With the introduction of digital PBX
systems in the 1970s, which offered dozens of features and capabilities analog centrex service could not provide, centrex demand leveled off and began to decline.
A Harris "Accommodator" software package, a customized voice and data system that work's with the Harris 20-20 digital PBX
and tandem switch, has been installed.
AT&T's proposal included a System 85 digital PBX
for voice and data switching and a local data network, called Information Systems Network (ISN), for high-volume data communications.
CXC's Rose system also integrates a digital PBX
with a local-area network to provide a fully distributed switching and communications processing system with dynamic allocation of bandwidth and a packet data channel to each terminal.
According to Northern Business Information (NBI), AT&T Information Systems (AT&T-IS) finished 1984 with the largest order book for new digital PBX
systems in the industry, with a customer base reported to be almost four times larger than its nearest competitor.