>I got my numbers from Cisco's Internetworking Terms and Acronyms (not >that Cisco is always right ;-) It says RS-232 was limited to 64 Kbps and >that RS 449 is 2 Mbps. > >Here what that document says about RS-530: > >Refers to two electrical implementations of EIA/TIA-449: RS-422 (for >balanced transmission) and RS-423 (for unbalanced transmission).
Here's a bit of the history. RS-232 specified electrical, mechanical, and logical aspects of the interface. X.21 bis is _almost_ identical. The next generation split up the electrical and mechanical: RS-422 relatively high speed, short-range, balanced RS-423 shorter unbalanced, longer range, lower speed, easily interoperates with RS-232 electrical (well, with a resistor) RS-449 37-pin mechanical connector (No RS- but ISO-number) 15-pin connector originally used for X.21. RS-530 cleaned up the act. > >I don't think the actual numbers matter to answer the fellow's question. >The bottom line is that serial doesn't mean slow. OC-768 isn't slow! -- "What Problem are you trying to solve?" ***send Cisco questions to the list, so all can benefit -- not directly to me*** ******************************************************************************** Howard C. Berkowitz [EMAIL PROTECTED] Chief Technology Officer, GettLab/Gett Communications http://www.gettlabs.com Technical Director, CertificationZone.com http://www.certificationzone.com "retired" Certified Cisco Systems Instructor (CID) #93005 Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=41690&t=41670 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]