APC 7800 PDU serial pinouts

[rwpatterson]

APC pinouts for their PDUs (tested on 7800)

       DB9 female            RJ-45 Plug   |   RJ-25 Plug   |   RJ-11 Plug
   (Alcatel adapter)
 __5___4___3___2___1__        12345678    |     123456     |      1234
\  O   O   O   O   O  /     |-||III|||-|  |   |-|III||-|   |    |-III|-|
 \                   /      | |||||||| |  |   | |||||| |   |    | |||| |
  \__O___O___O___O__/       +----++----+  |   +---++---+   |    +--||--+
     9   8   7   6               ||       |       ||       |       ||

   1  (open)              1  White-Orange |                |
   2* Yellow (RX)         2  Orange       | 1  Orange      |
   3* Black (TX)          3* White-Green  | 2* White-Green | 1* White-Green
   4  Orange              4* Blue         | 3* Blue        | 2* Blue
   5* Red (ground)        5* White-Blue   | 4* White-Blue  | 3* White-Blue
   6  Brown               6  Green        | 5  Green       | 4  Green
   7  Blue                7  White-Brown  | 6  White-Brown |
   8  White               8  Brown        |                |
   9 (open)

(pins with an asterisk(*) next to them are used, others are not)

Crosswalk:
  DB9 pin #2 (Yellow)      to RJ-45 #3 or   RJ-25 #2 or     RJ-11 #1 (White-Green)
  DB9 pin #3 (Black)       to RJ-45 #4 or   RJ-25 #3 or     RJ-11 #2 (Blue)
  DB9 pin #5 (Red)         to RJ-45 #5 or   RJ-25 #4 or     RJ-11 #3 (White-Blue)

The adapter I have can use an 8 position (RJ-45) adapter, but the APC can only use
at most a 6 position (RJ-25) adapter, so I made a straight through cable with the
RJ-45 on one side and the RJ-25 on the other. I just clipped RJ-45 wires 1 and 8.
If you use a rolled cable (like the telephone company uses), I don't believe this
setup will work.