Wireless Fixed Base
Issue 6 September 2001
3-13
Figure 3-2. Wireless Fixed Base
Power Options
To operate with CAUs, WFBs in a DWBS require -48 volt (v) accessory power.
The -48 v power is provided over twisted pair to the WFB on the fourth pair
(white-brown, brown-white; pins 7 and 8) of the RJ45 connector. The power
supply must be within 397 feet of the WFB if a single pair is used for accessory
power. The power supply must be connected to an outlet that is not controlled by
a switch. Power cord locks should be considered. Usually, the power supplies are
unplugged.
Centralize power supplies as practical to allow for testing and isolating problems.
Use either a battery backup of the supplies or supplies with battery backup for
customers that have battery backup from the DEFINITY ECS.
Be sure to put a power supply at each of the following locations and in the order
presented:
1. Equipment room. (This is fine as long as the WFBs are within 397 cable
feet of the room.)
2. Wiring closet. (This is fine as long as the WFBs are within 397 cable feet
of the wiring closet.)
3. Near the WFB. (This should be done only whenever you cannot put the
power supply into a closet or an equipment room.)
ALARM
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POWER
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