Pulse or digital communications – Repeaters – Testing
Patent
1985-10-03
1989-07-11
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
361413, 379 98, 364708, H04M 1100
Patent
active
048478636
ABSTRACT:
Expandable data modem for data transmission of digital data at certain defined data rates which includes a base for mounting those components of the modem which are data-rate independent and a sub-base for mounting all data-rate-dependent components, and a two-part plug-in connector for detachably plugging the sub-base into the base. In this way the modem can be expanded to higher data rates by simply replacing the sub-base with its data rate-dependent components instead of replacing the entire modem. In a preferred embodiment the base and the sub-base are two printed circuit boards joined by a card-edge connector.
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IBM Asynchronous Communications Adapter Instructions for IBM PC, Apr. 1983, 18 pages.
Micro Systems Magazine, Mar. 1984, p. 160, Bizcomp Advertisement.
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