Cellular Digital Packet Data (CDPD)
November 3, 2009 by Nauman · Leave a Comment
In 1992, AT&T Wireless Services developed cellular digital packet data (CDPD) protocol, a data-only protocol that (re-)uses the AMPS or IS-136 network. Packets (typically some 1.5 kilobytes) use vacant cellular channels – either an assigned channel or between calls. CDPD does not communicate with the underlying network (but does utilize knowledge of this networks channel [...]