Nortel Meridian 1 Option 11C Planning And Installation Manual page 185

5 Connect the attendant console to the PFTU:
• attendant console 14 Tip (14T) to ground
• 3 Tip (3T) of PFTU to 11 Ring (11R) of attendant console
(power fail transfer switch)
• attendant console 11 Tip (11T) to ground.
If power to the M2250 attendant console is not provided by two Digital
Line card TNs, connect;
• G-W of AUX to 8 Tip (8T) of attendant console (-15 volts),
• W-G of AUX to 7 Tip (7T) of attendant console (+15 volts).
Figure 78
Power Fail Transfer
Installing power fail transfer units Page 185 of 408
Option 11C Planning and Installation Guide