When I was doing formal protocol testing at the Corporation for Open Systems, our standards were officially international when they existed, but we accepted relevant national standards--or those we thought were relevant.
Specifically, while the X.25 stack called for physical layers including X.21 bis, we accepted RS-232C. The electrical differences were insignificant. Both specify a DB-25 connector. But it turned that X.25 specifically points to ISO 2110 as the connector specification. We received a device to test from a European vendor, and plugged in the appropriate DB-25. No problem. To be sure nothing got loose, we then screwed down the retaining screws at the ends of the hood, noting it was a little difficult. After the device passed testing and was about to be returned, we found the awful truth. There is one teensy, tiny difference between ISO and EIA DB-25 connectors. ISO have metric screw threads and EIA have English. We eventually had to drill them out. In like manner, when it comes to the DB-60, I had a young friend who took an individual IQ test, which contained a timed test of putting various-shaped pegs in variously-shaped holes. The psychologist told him a good time was (let's say 3 minutes), but he completed it in about 30 seconds. He inquired what his speed meant. Tugging on the square peg stuck in the round hole, the psychologist grumbled "it means you're very strong." Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=32836&t=32836 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
