1) In modern usage the PECL terminators would be tiny resistor
networks. 1a) If the PECL signals are fairly static slow data
these may not have to be terminated on a short on-board run. But
that leads to the question, why did you convert them to PECL in
the first place if they are slow unclocked data? 1b) If the PECL
signals are clocks or latch enables etc. you probably want to
terminate them. 1c) By Thevenin's Theorem most usual way to
terminate PECL will end up being like figure 4 in
http://www.micrel.com/_PDF/HBW/App-Notes/termination.pdf 2) One
terminator at far end. But it is unusual (see my note below 4)
to fan out PECL. If necessary to split a signal multiple ways
there are fanout buffers e.g. SY100EP11U, but this would be an
unusual use of PECL. 3) Wrong. But note by Thevenin's theorem, a
50 ohm resistor to Vcc-2V, can be replaced by two resistors one
to ground and one to Vcc. See 1c above. Overall note: Today you
are most likely to see PECL or LVDS used on board-to-board or
assembly-to-assembly inter