The IS-95 implementation of CDMA was designed to improve call handling density by a factor of 10 or so over AMPS. I am not aware of any older versions of CDMA. D-AMPS (IS-54) was a TDMA variant. The Qualcomm CDMA performance testing were performend sometime in 1988/1989. So, it seems that the ethernet version predates the cellular version, but I could be wrong! Hans Mellberg Engineering Manager BACL 230 Commercial Street Sunnyvale CA 94085 USA 408-732-9162 x38 408-732-9164 fax
----- Original Message ----- From: [email protected] To: [email protected] ; [email protected] ; [email protected] ; [email protected] ; [email protected] Sent: Monday, August 18, 2003 8:56 AM Subject: Re: CDMA Product Approvals So now I'm curious, which came first Ethernet or cell phone. CDMA is also used on Ethernet. At least the original simplex versions - triple shielded coax, then cheaper net - essentially phone cables. It wasn't needed with full duplex PTP transmission, which some might argue isn't true Ethernet. I remember seeing those old brick sized cell (mobile?) phones but thought they were slightly behind LAN's and the precursor to the Internet ARPANET (probably have wildly misspelled that) seems to have been around much longer than that. So I'm curious what was CDMA originally designed for? Anybody know. Gary
