jaborn@gemini.bbn.com (Justin A. Aborn) (11/16/90)
Does anyone out there have experience with V.35 interfaces. What are the real voltages that real equipment uses? CCITT Recommendation V.35 for a balanced line driver says: "When terminated by a 100-ohm resistive load the terminal-to-terminal voltage should be 0.55 +- 20% volts so that the A terminal is positive to the B terminal when a binary 0 is transmitted, and the conditions are reversed to transmit binary 1." However AT&T uses 1.1 volts terminal-to-terminal and claims it is V.35. I think AT&T misread the specification years ago; thinking it said driver outputs should be +- 0.55 volts. It seems that the 1.1 V terminal-to-terminal voltage has become the defacto standard. Just to make sure it exists somewhere, does anyone out there know of V.35 implemented with 0.55 volts? Justin Aborn 617-873-3552