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.... Integrated ATM Inverse Multiplexing empowers customers
....


MAIDENHEAD UK - For corporations seeking a solution to the
problem of adding bandwidth to their network gracefully,
Nortel (Northern Telecom) has introduced a High Performance
ATM Inverse Multiplexing solution on its Magellan Passport
ATM switch. This allows customers to intelligently bundle
several separate physical DS1/E1 bandwidth resources (1.5/2
Mbps) into one logical ATM connection of up to 16 Mbps,
avoiding the often prohibitive cost of moving to DS3/E3
(45/34 Mbps) facilities. Both Network Providers and
Enterprises can incrementally add bandwidth in steps of
1.5/2 Mbps without requiring any modifications to their
network applications whilst at the same time increasing
reliability and robustness which results from the higher
availability of distributed resources compared to a single
high-speed facility.

The integration of Inverse Multiplexing for ATM (IMA) into
Nortel's Magellan Passport switch not only eliminates the
need for an external inverse multiplexer, but also provides
full integration into Passport's advanced ATM trunking,
loadsharing, routing and traffic management capabilities
which in turn support all existing Passport services, such
as ATM Bearer Service, Frame Relay, VBR Voice, LAN, SNA,
X.25 and Circuit Emulation Services.

Nortel's Passport IMA is implemented on a new ATM
Functional Processor Card (FP) with eight DS1/E1 IMA ports.
Flexibility and investment protection is provided with the
ability to redeploy the IMA card as a high density eight
port DS1/E1 ATM UNI module at a later point in time.

The integrated IMA on Nortel's Passport switch supports
full ATM Quality of Service (QoS) and will interoperate with
the soon to be ratified ATM Forum IMA specification. This
vendor interoperability enables the customer to use IMA in
both heterogeneous access and trunking environments.

Nortel offers added values with its Integrated IMA
implementation which exceeds the requirements of the ATM
Forum IMA specification. These include the support of
elastic connections, increased differential delay, a user
configurable IMA link selection algorithm, ability to
support non-synchronous links and the integrated, graceful
and predictable handling of physical link failures. Nortel's
IMA implementation provides intelligent mechanisms to
preserve ATM QoS under link failure. The amortization period
for Passport IMA hardware in Europe is only a few months and
costs of International and longer national facilities can
often reduce this even further.

"We have seen significant demand for ATM inverse
multiplexing solutions in the last months and expect this to
persist for the foreseeable future," said Barry Black,
director, Product Marketing and Business Strategy, Nortel.
"In speaking to our customers, we have found the greatest
challenge to their network is to grow their bandwidth in a
fashion that has as little financial and management impact
as possible. Not only will the IMA feature provide these
benefits, it will also interwork transparently with the many
value added features available on Passport today."

Nortel had a 1996 turnover of $US 3 billion in Europe,
operating both independently and through its joint ventures
with the LagardŠre Group in France (Matra Communications and
Nortel Matra Cellular), Olivetti SpA in Italy (Sixtel), and
Daimler-Benz Aerospace AG in Germany (Nortel Dasa Network
Systems). Nortel employs approximately 16,000 people across
Europe in Research and Development, manufacturing and sales.

Nortel works with customers worldwide to design, build,
and integrate digital networks - for information,
entertainment, education, and business - offering one of the
broadest choices of network solutions in the industry.
Nortel had 1996 revenues of $US 12.8 billion and has
approximately 68,000 employees worldwide.

For more information: visit Nortel's web-site at
http://www.nortel.com 97379



About Nortel's Magellan Passport The Magellan Passport ATM
Enterprise Network Switch is a key component of Nortel's
end-to-end solution for private enterprise and public
carrier networks. The Passport product family supports
multimedia network services on a high-performance,
high-capacity networking platform. Ideal for mission
critical environments, Passport switches consolidate
multiple voice, data and video networks as well as new
applications meeting organisational demands for high
bandwidth at low cost. The Magellan Passport switch won
DataCommunications Magazine's Hot Product award for voice
networking over ATM in January 1997 and 'Best of Show' at
Paris NetWorld and Interop in 1996.

Nortel works with customers worldwide to design, build, and
integrate digital networks – for information, entertainment,
education, and business – offering one of the broadest
choices of network solutions in the industry. Nortel's
research capabilities around the world include a network of
research and development facilities, affiliated joint
ventures, and other collaborations fostering innovative
product development and advanced design research in 14
countries. Nortel had 1996 revenues of $US 12.8 billion and
has approximately 68,000 employees worldwide.

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