SCHLUMBERGER SELECTS ZyXEL MODEMS AS CORPORATE STANDARD; UTILIZES DEVICES
TO SEND DATA FROM REMOTE OIL FIELDS

ZyXEL Passes Industry-Wide Torture Tests Simulating Rigorous Environment

SOMEWHERE IN THE MIDDLE EAST, October 12, 1994 -- It's early dawn and a
group of field engineers stand gathered around a newly-drilled well.
Experts from Schlumberger are about to lower their equipment 1,500 meters
to the bottom of the well and find out whether the well's owner has struck
pay dirt. Once the tests are completed, the data is sent from this remote
site via modem over a mixture of microwave, terrestrial and international
satellite circuits to the nearest Schlumberger facility for processing and
forwarding to the company's client.

Schlumberger is a $6.7 billion company. It boasts facilities on every
continent but Antarctica. Schlumberger mixes oil field services and
exploration with a sophisticated electronics and technology business.
Anaheim, Calif.-based ZyXEL's modems have become a part of the company's
state-of-the-art approach to well testing. In fact, after extensive
industry-wide testing, ZyXEL's modems have been chosen by Schlumberger as
the company's corporate-wide recommended standard for use in office and
field applications.

"Schlumberger has been able to maintain its competitive advantage by
upholding its technological edge," said Rob Clark, Schlumberger's manager
of the company's Denver-based network operations center. "We are always on
the lookout for products, services and technologies that will make
Schlumberger the most customer-responsive company in the industry."

Clark added that because time is money in the oil services business, the
ability to provide clients with timely information is also a priority.
"Schlumberger pioneered the use of mobile satellite dishes to forward data
from remote field locations," he said.

The use of mobile satellite dishes is but one of many means the company
employs to send data. Schlumberger also relies on telephone, microwave,
radio and cellular communications to forward data, using a modem as the
transmission device. However, these modems must stand up to the rigors of
typical oil field telephone conditions -- which aren't so typical, says
Clark.

Many oil fields are in remote locations, with the majority located in
third-world countries. To transmit data from these outlying destinations,
a modem must contend with noise, satellite delays, inconsistent line
quality, atmospheric conditions, the unpredictability of the
communications medium and the differing dial tones, busy tones, ringing
signals and transmit levels particular to each county.

Schlumberger put eight of today's leading modems through a series of
"torture tests," simulating the actual conditions of oil field
communications. Only ZyXEL was able to pass all of the tests.

"In order to select the appropriate modem, it was necessary to test them
under the worst conditions that we could simulate." By measuring the
individual performance of each, we discovered which modems would stack up
to real-life conditions and which wouldn't," explained Clark. "ZyXEL
outperformed all others. The company's modems distinguished themselves in
a mission-critical environment."

Clark added that ZyXEL also distinguished itself with the quality of its
technical support. "One of the key factors influencing our decision to go
with ZyXEL was the first rate technical support we received. ZyXEL worked
very closely with us as we conducted our tests and strived to improve the
product by adding features that we required."

Schlumberger has since installed ZyXEL modems worldwide. Clark himself
utilizes a bank of ZyXEL modems at his Colorado LogNet Center, servicing
all of North America. ZyXEL modems are used throughout the company's
private, worldwide data network with 20,000+ users in 219 US cities and 53
countries. ZyXEL modems have been installed in the company's fleet of
trucks and off-shore cabins equipped with all of the tools and technology
necessary to conduct on-land and off-shore petroleum exploration and
testing.

"We are also in the process of deploying our second-generation
telecommuting hardware. As our sales force and other mobile employees
access corporate resources, they dial into ZyXEL modems. We currently have
22 ZyXEL rackmount units deployed around the world for this purpose and
expect to increase the number to 40 in the near future," said Clark.

Company Background

ZyXEL, headquarters in Anaheim, California, is a leading supplier of high
speed modems and compatible products including V.32bis/V.42bis modems with
voice and cellular capabilities. Since its inception, ZyXEL has been
building a reputation as the price/performance leader in modems by
providing high quality products at affordable prices.

ZyXEL
4920 E. La Palma Ave
Anaheim, CA 92807
714-693-0808,  fax 714-693-8811,  BBS 714-693-0762

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