Allied Telesis AR Series Hardware Reference Manual page 44

44 AR Router
AT-AR740 AC
AC models of the AT-AR740 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 AT-RPS 740, 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 45.
Software Release 2.0 or higher includes monitoring functions for the PSU and
fan in both the AT-AR740 and the RPS. See "LEDs and what they mean" on
page 40, for more information.
AT-AR740-80 DC
The AT-AR740-80, designed for use by telecommunication carrier sites,
supports connection to a 48V DC power supply (in the range 39-60V DC). The
DC model does not support an RPS connection, and does not support
monitoring of the main PSU or fan.
Instructions outlining how to connect an AT-AR740-80 to a DC power supply can be
found in the AR700 Series Router Quick Install Guide. You should read these
instructions and your router's Safety Information before attempting to connect the
router to a DC power supply
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.
Redundant Power Supply (RPS)
AC models of the AT-AR740 can be used in conjunction with the AT-RPS 740.
Each AT-RPS 740 can provide power supply and mains circuit redundancy for
up to two AT-AR740s. For more information on the AT-RPS 740, see "AT-RPS
740" on page 45.
For connection to an AT-RPS 740, the AT-AR740 Router has a female DB25
connector on its rear panel (Figure 17 on page 41). Pin outs for the connector
are listed in Table 20 on page 45.
Figure 19: DB25 female connector pinout for an RPS on the AT-AR740 rear panel
Pin 13
Pin 1
Pin 14
Pin 25
A740db25
C613-03031-01 REV C