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