Vintage IBM Wireless Modem for RD-LAP & MDC4800 PC Card 38H5021

Description

For auction is a IBM Wireless Modem for RD-LAP & MDC4800 PC Card, IBM p/n 38H5021.Auction includes
card only, cables not included.
For support information please see IBM's web site.
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MDC4800 and RD-LAP
The second major radio packet data network type is a Motorola technology known as ARDIS in the US. The same technology is used in other countries, notably Germany where it is known as Modacom, and Southeast Asia and the Pacific Rim where it is known as Datatac. The following description will use ARDIS as an example of a network implemented using this technology.
The ARDIS network uses two different protocols. The original protocol is called MDC4800 (Mobile Data Communication 4800), and as its name suggests operates at 4.8 Kbps. The newer services use a protocol called RD-LAP (Radio Data-Link Access Procedure), which provides a data rate over the air link at 19.2 Kbps. Whatever air link protocol is used, the underlying network is the same. In North America, ARDIS uses radio frequency channels in the 806-824 MHz band for base station receiving, and 851-869 MHz for base station transmitting.
ARDIS provides a number of protocols to access the network including:
· SNA LU 6.2
· X.25
· SNA 3270 terminal emulation and bisynchronous 3270
· Bisynchronous point-to-point
· Asynchronous
These protocols are used over a leased line connection with dial backup at either 9.6 Kbps or 19.2 Kbps.
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