[GreenKeys] TTY Model 56D pinout

[Stephen Jones]

Hello, this TTY is probably too recent, but I'm hoping someone might  
have a
clue about it.  I have a Teletype Model 56D which is a video display  
terminal
circa Model 40 which has an RJ45 jack for its line interface.  I  
assumed that
a 3B2 style cable could work with it, however, that doesn't seem to  
be the case.
When the terminal is powered on it runs through its test cycle and  
then stays in
'wait'.  I believe its waiting for a signal on the serial line (via  
RJ45), but I
need the pinout for the cable.  If anyone has a user or technical  
manual on the
56D, I'd appreciate it.