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Mitel Corporation. (55PT)

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Monday 14 February, 2000

Mitel Corporation.

New Product

Mitel Corporation
14 February 2000

FOR : Mitel Corporation


Silicon-Ringing SLIC from Mitel Semiconductor Delivers Superior Performance at
a Competitive Price

OTTAWA, ONTARIO--New SLIC is an important addition to expanding portfolio of
complete telecommunications line card solutions.

Mitel Semiconductor, a division of Mitel Corporation (TSE: MLT, NYSE: MLT)
today announced the MT91610, a fully-featured programmable Subscriber Line
Interface Circuit (SLIC) that delivers highly reliable ringing at competitive
cost for telecommunications access applications. The MT91610 uses an advanced
ringing architecture to improve performance, while integrating complete
functionality into a very compact, off-the-shelf device.

'The new MT91610 is the second product in Mitel Semiconductor's strategy to
provide a complete range of interfaces between a switching system and
subscriber loop in short to mid-range telecommunications applications,' said
Marcia Jervis, product line manager, Mitel Semiconductor. 'We are building on
Mitel's in-depth experience in voice telephony to meet the requirements of
system designers for a highly-featured, silicon-ringing SLIC that delivers
reliable performance at the right price.'

An analog silicon-ringing SLIC, the MT91610 supports the growing number of
applications that require balanced and localized ringing, including PBX, key
telephone, pair gain, digital loop carrier, home gateway, SOHO, and remote
access systems. The MT91610 also offers a system-level solution when combined
with Mitel Semiconductor's DAA, CODEC, switching and DTMF technology.

MT91610 offers flexible, cost-effective solution

Mitel's MT91610 provides a complete line card interface between a switching
system and a telephone line. The MT91610 reduces system design and
manufacturing costs because its integrated, balanced ringing architecture
eliminates the high-cost power components associated with ring generators.

Using sine wave ringing in excess of 70VRMS, the MT91610 provides superior
ringing capabilities. Compared with other approaches, sine wave ringing
generates a better quality ringing signal, is more reliable, and reduces the
risk of cross talk on adjacent lines, which is characteristic of trapezoidal
architectures. Sine wave ringing is also increasingly required by regulatory
agencies because, unlike competing approaches, it operates with legacy
equipment and is inherently more stable.

The MT91610 supports battery feed, user-definable line and network balance
impedance, and off-chip audio gain programming. With loop lengths up to 2000
ohms, the device increases flexibility and ease of manufacture for customers
who are designing access equipment that ranges from low-featured PBXs to
high-end digital loop carriers. The MT91610 goes into power-down mode when not
in use to reduce power consumption in short-loop applications such as pair
gain and wireless local loop. With on-hook transmission and tip ring reversal,
the MT91610 accommodates DID signaling in PBX and CLID applications.  The
device also offers unbalanced detection to provide superior detection in
applications requiring ground start.

The MT91610 works with all international standards. To help address system
requirements, the MT91610 can accommodate a programmable current range between
20mA and 30mA, and loop lengths in excess of 1800 ohms in voltage foldover

Support, pricing and availability

The MT91610 is supported with an evaluation board and product development
collateral. In addition, Mitel's global applications team is available to
assist customers in evaluating performance in full-duplex mode, and developing
new systems.

A CMOS device, the MT91610 is supplied in a 36-pin QSOP. The device is
available now, and pricing is US $4.00 in 10K-piece quantities.

About Mitel

Mitel Semiconductor specializes in connectivity solutions for the
communications and medical industries with a product range that includes
components for both wired and wireless networks; microelectronics for enabling
the convergence of voice and data; optoelectronic devices for high-speed
Internet systems; customer-specific communications Systems Level Integration
(SLI) solutions, and applications-specific integrated circuits (ASICs) for
medical applications such as pacemakers and hearing aids.

Mitel is a growing global provider of converging voice and data systems and
applications, and specialty semiconductors for the communications industry.
The company has annual revenues of more than $1.3 billion and employs some
6,000 people worldwide.


Mitel Semiconductor
Patti Dalby
(613) 592-2122
Web Site:
Tiana Wiersma
(503) 241-1574