Allied Telesis AR Series Hardware Reference Manual page 47

Hardware Reference
C613-03031-01 REV E
The Ethernet LAN ports are autosensing 10/100 full duplex interfaces.
The two asynchronous serial ports can be used as general purpose ports for
terminals, printers or modems. They are effectively identical and can be
independently configured. The default communications settings are:
• 9600 bps
• 8 data bits
• 1 stop bit
• no parity
• hardware flow control.
Power Supply
The AT-AR740 is available in two power supply configurations: a universal AC
model and a 48V DC model. The AC model includes an inlet for the AT-RPS
740 (Redundant Power Supply). The AT-RPS 740 can be purchased separately,
and each unit supports up to two AT-AR740 routers.
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.
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