Coherent Cancels More South African Echoes
LEESBURG, Va.--(BUSINESS WIRE)--May 9, 1997--Leading voice enhancement and echo
cancellation specialist, Coherent Communications Systems (NASDAQ:CCSC) has recently
supplied a further consignment of EC-6000 Series 2 Digital Echo Cancellers to Telkom SA. The
units are to be installed at Telkom SA's two international exchanges in Johannesburg, which are
equipped with Siemens switches, with a total of just under 300 groups of Coherent cancellers now
in operation.
Telkom SA's international services use a variety of facilities including terrestrial, satellite and
submarine cable routes. Traffic is primarily regional African activity - particularly to Namibia,
Zimbabwe, Mozambique, Lesotho and Swaziland - and Telkom SA is also witnessing a rise in
traffic to and from the United States, Europe and the Far East. Telkom SA has been a long-term
user of Coherent's echo cancellation technology, first implementing EC-6000s on its network in
1993. Brian Herbert, Acting Manager, International Maintenance Centre (IMC), comments: ``Our
initial evaluation of echo cancellation equipment in the early 1990s involved three different
manufacturers - we conducted a trial in conjunction with another country, who was also looking to
change over from echo suppression, and monitored call duration over a number of months,
switching between cancellers and the existing suppressers. There was clear evidence of longer call
duration by a number of seconds, which cumulatively represented a huge potential for extra
revenue. We were also looking for the cancellers' reaction to high signal levels, measuring
performance closely on this aspect.
``Our requirement has progressed considerably from these early trials, which resulted in our
installing digital echo cancellation with Coherent's EC-6000 units at our international exchanges.
Today, we are looking for the ability to measure such aspects as the average propagation delay on
the network through the canceller, particularly in the wake of introducing radio network
technology, and we also want to measure average levels, monitoring high levels in particular, as
well as bit error rates. The echo canceller sits at the very front end of the network and therefore
provides the ideal access point for this type of information. We have been working closely with
Coherent to develop this aspect, as we believe it is crucial to our TMN strategy. As we switch
from C5 to C7 signalling, we are also looking for greater configurability of the alarm functions
within the echo cancellers - developments which will give us greater monitoring capability in the
future.''
Coherent's focus is to provide telcos, PTTs and network operators with the tools to maximize
network performance and voice quality on wireline and wireless networks, across the full range of
applications. The Company specializes in providing a complete turnkey service, encompassing all
aspects of design, supply, installation and maintenance of the cancellers and associated network
equipment.
Designed to exceed current ITU-T standards, Coherent's products provide a flexible operating
platform which can be tailored for a range of applications and network environments. At their core
is a combination of Coherent's state of the art ASIC devices, patented Non-Linear Processor
(NLP) techniques, as well as fast and stable convergence (50mS for combined ERL and ERLE of
35dB) - prerequisites for modern network applications.
The EC-6000 Series 2 Digital Echo Canceller supports Coherent's range of application-specific
software, enhancing the unit's adaptability for a wide range of problem-solving in different network
situations. Software can be remotely downloaded and upgraded, providing a versatile and
cost-effective means of maintaining maximum operational flexibility. In addition, the unit features
local loopback facilities, extensive alarm reporting and self-test diagnostics, as well as significantly
reduced power consumption for improved performance and reduced heat generation.
Coherent Communications Systems Corporation is a worldwide leader in state of the art voice
enhancement technology, spanning echo cancellation platforms and associated network software.
The Company's products are used globally by major wireless and wireline telecommunications
companies and network operators, including AT&T Wireless, British Telecom, Cable & Wireless,
Cellular One, Cisco Systems, Deutsche Telekom, France Telecom Mercury, Nokia, NORTEL,
Telia, and Telmex among the extensive list. Coherent is a fully accredited ISO 9001 company,
dedicated to maintaining the highest quality standards at every level.
Also available via Coherent's Web Page: coherent.com
This news release contains forward looking statements, including statements of the Company's
sales and marketing expectations, that involve risks and uncertainties associated with the political
and social environment of Africa, intense competition, variations in market growth, lack of
customer acceptance, timely availability of raw and produced materials, and competitive pricing of
products as well as other risks detailed in the Company's SEC reports.
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