AT&T Merlin II Release 3 System Manual page 29

How to Use a Power Failure Telephone
Plug the basic telephone into the power failure telephone jack on a control
unit module. When there is a power failure, the power failure telephone
bridges to the lowest position as shown in Figure 2-15. Place and receive
calls on your power failure telephone.
Power failure
telephone jack
Bridges
to lowest
position
408
FIGURE 2-15 A Power Failure Telephone Jack on a 408, 400w/TTR, and 800
module.
Ordering Information
You can order components for the MERLIN II system through the AT&T Source
Book, or contact the National Parts Sales Center (NPSC) at 1-800-222-PART.
Bridges
to lowest
position
Power
Bridges
failure
to lowest
telephone
position
jack
400
w/TTR
Power
failure
telephone
jacks
800
Phone Accessories 2-21