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ISDN (Integrated Services Digital Network)
ISDN (Integrated Services Digital Network)Overview
Integrated Services Digital Networking or ISDN is a set of international standards that have been adopted by
the International Telegraph and Telephone Consultative Committee (CCITT). ISDN provides businesses with
integrated communication services that optimise the flexibility and economy of digital networks worldwide.
What this means to a business is that corporate users can transmit voice and data with increased speed,
improved quality and greater economy and ease.
As simple as placing a voice call to virtually anywhere in the world, ISDN can extend this capability
to almost all forms of information in the future such as text, graphics, images and ultimately,
full-motion video.
Customer Profile
• Medium to large multi-site enterprise customers
benefit the most from ISDN services. The ability to
centralise services like voice mail to reduce cost
and management expenses increases the
productivity of the entire enterprise network
• ISDN services are supported on all of the systems
within the Meridian 1 and Succession
Communication Server for Enterprise 1000
(CSE1000) portfolios. So, whether it’s a branch
office with Option 11C Mini or a large corporate
headquarters with Option 81C, customers can
leverage the features, flexibility and power of
Meridian 1 and CSE 1000 and their ISDN services
in an enterprise network environment.
Typical Applications
From the smallest system in the portfolio,
Option 11C Mini, to the largest with Option 81C,
businesses all of sizes can leverage Nortel Networks
state-of-the-art MCDN features to lower costs, boost
employee productivity and enhance the level of
responsiveness provided to customers.
From centralised voice mail to reduced hardware
and administration costs, to automatic call
distribution over the Meridian 1 corporate network
to enhance customer responsiveness to ISDN
features over a VoIP network, an investment in
Meridian 1 and CSE 1000 is a future-safe investment
in the ability to network and interoperate with ISDN,
ISDN Q.SIG and MCDN. So, as businesses expand,
they can seamlessly integrate additional campus
sites or branch offices. All with access to the same
robust feature sets as their main campus.
Key Points
• ISDN PRI on Meridian 1 and CSE 1000 offers an
opportunity for PBX network growth at much
lower cost to businesses in conjunction with far
greater manageability
• By upgrading existing T1 or E1 spans with PRI
to a central office, improvements in network
performance can be obtained without adding any
new leased line facilities
• The efficiency of PRI can reduce the number of
physical trunks required to handle the current
network traffic by as much as 30%, which in turn,
can lower PBX operating costs
• As a trunk interface to a DMS-100 central office,
ISDN PRI on the Meridian 1 offers businesses
switch access to multiple Central Office (CO)
services and unprecedented flexibility in trunk
usage. It also provides the platform for future
service enhancements
• For added network reliability, ISDN PRI provides
the advantage of a backup D-Channel. This
backup D-Channel automatically takes over for a
failed primary D-Channel to prevent the loss of
calls over the B-Channels