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Hardware Reference 13
C613-03087-00 Rev E
Power Supply
The AT-AR745 is available in two power supply configurations: a universal AC
model and a 48 V DC model. The AC model includes an inlet for the
AR740 RPS (Redundant Power Supply). The AR740 RPS can be purchased
separately, and each unit supports up to two AT-AR745 or AT-AR725 routers.
AT-AR745 AC AC models of the AT-AR745 have a universal AC input connector and a power
switch on their rear panels. A DB25 connector for an optional external
Redundant Power Supply (RPS), such as the AR740 RPS, is also located on the
rear panel.
Pin outs for the DB25 RPS connector, and cable specifications for RPS supply
cables, can be found in “Redundant Power Supply (RPS)” on page 14.
The router can monitor the PSU and the fan in both the router and the RPS. See
“AR745 LEDs and what they mean” on page 15 for more information.
AT-AR745-80 DC The AT-AR745-80, designed for use by telecommunication carrier sites,
supports connection to a 48 V DC power supply (in the range 39 V to 59 V DC).
The DC model does not support an RPS connection, and does not support
monitoring of the main PSU or fan.
DC supply cable specifications:
■ Number of wires (cores): 3
■ Minimum size: 2.1 mm
2
(14 AWG)
■ Minimum cable rating: 600 V, 90 degrees Celsius
DC power supply specifications:
■ 48 V DC (38 V to 60 V DC is acceptable)
■ Either positive grounded or negative grounded
Figure 5: DC Power inlet terminals on an AR745
Safety Safety information and instructions outlining how to connect an AT-
AR745-80 to a DC power supply can be found in the AR700 Series Router
Installation and Safety Guide. You should read these instructions before
attempting to connect the router to a DC power supply.
!
Caution Some interfaces that may be installed in the router are not
transformer isolated. This means they will be referenced to the frame
ground of the equipment and may be damaged if connected to an
interface on another piece of equipment which is at a different ground
potential.
3
1
FOR CENTRALIZED DC
POWER CONNECTION,
INSTALL ONLY IN A
RESTRICTED AREA
38-60 VDC , 2 A
DC POWER