Specifications

Chapter 1 Installation
1-4
Table 2.2 Power Connector
Pin Number Signal
1
-42 to -58Vdc or Carrier Access AB-
115POWER converter cube
2 DC Return, to power supply +
terminal
3
Telco or Safety (Green Wire) Ground
-48
V
Telco or Safety
Ground
DC
Return
The 3-position POWER connector is for DC power input only.
Power Installation
The installation site should have a 115V AC power receptacle for the AC/DC power converter, or a -
48V DC power supply with a minimum of 1 A spare capacity. The Carrier Access Model AB-
115POWER converter cube is provided in the Access Bank
TM
kit to convert a 115Vac wall plug outlet to
-48Vdc and 1 A. The power supply is pre-wired to an 8 foot, 16 AWG, 3-conductor cable for power
and chassis ground connections. When wiring to an external -48Vdc power source, such as a battery
rack, an external fuse panel or circuit breaker unit should be in place that is consistent with the current
rating of the wire used between the source and the Access Bank
TM
connector; 18 AWG or larger wire is
recommended. 24 AWG telephone station cable is not suitable for power wiring or grounding. The
power cord should be strapped to the plastic connector located on the bottom corner with a wire tie to
avoid disconnection.
Note: -Use only a Class 2 power source, -48Vdc, 1A
or higher.
-There are no fuses in the Access Bank that need to be replaced.
-48V Input and +Return power connections are internally safety protected in the Access Bank with new
solid state, automatic resetting, current limiting devices. There are no fuses in the Access Bank subject to
field replacement. Safety design conforms with U.L. 1459 and National Electrical Code requirements for
telecommunications equipment safety. Solid State over voltage protection is incorporated in the Access
Bank power input to prevent a.c. line transients, lightning or inductive motor spikes, from damaging
Access Bank electronics. Over voltage and over current protection are individually handled on each 12
FXS card and the LIU card. This provides for power distribution redundancy so that a line fault or over
voltage on one 12 FXS card does not destroy operation of the other card.