September 1, 1998
Single-Chip Modem Brings Forth New Ideas
For Remote Access Product Development
By Michael Sciannamea, Web Editor
A number of high-density remote access solutions are being created by
companies using the ADSP-21mod870, said to be the world's first single-chip
modem, from Analog Devices Inc. The single-chip 16-bit DSP-based modem
offers a high concentration of modem ports on a single chip used for analog (up to
V.90), ISDN, or T1/E1 connectivity for remote access server-based solutions for
corporate environments, Internet Service Providers (ISPs), and local exchange
carriers.
Advanced Computer Communications (ACC), a manufacturer of integrated remote
access and Internetworking products, is using the ADSP-21mod870 in the
company's high-density 192-port modem interface card for the Tigris family of
remote access concentrators (RAC). The Tigris family of integrated access
concentrators combines dial-in and dedicated access with wide-area networking
(WAN) and routing. The family is comprised of 3-, 7-, and 11-slot access
platforms, and a series of optional dual 10/100 Mbits/s LAN, universal WAN,
multifunctional DSP resources, and T1/E1 modules.
Digi International, a provider of data communications hardware and software,
chose the single-chip modem for use in its DataFire RAS and AccelePort RAS
family of communications servers, including DataFire RAS 24-60, DataFire RAS
4, and AccelePort RAS 8. Digi's server product family offers up to 60 56-kbit
modems and up to 60 64-kbit ISDN B channels on a single PCI card.
ECI Telecom, a provider of integrated WAN solutions, chose the single-chip
modem as the "intelligent gateway" for the company's Nevada CarrierClass
products for network service providers. ECI Telecom's Nevada Mass Dial-In
Network Access Server (NAS), is a high-performance, low-cost Internet/Intranet
access, as well as remote corporate access multiservice platform. Some of its
CarrierClass features are: NEBS, EIA, and ETSI 19-slot compatible chassis,
front-loading cards, as well as hot-swappable cards providing maximum scalability.
Data communications equipment manufacturer Patton Electronics has applied the
single-chip modem to its Patton 2800 Remote Access Server. The Patton 2800
supports up to 30 concurrent dial-up connections using either analog
(V.34+K56Flex) or digital (ISDN) modem modulations. In addition, the Patton
2800 RAS consolidates inbound telecommuter calls, PABX voice traffic, and
Internet access onto one T1/E1 or PRI connection.
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