Allied Telesis AR725 Application guide

AR700 Series Router
Hardware Reference
AR725
AR745
AR750S
AR750S-DP
AR770S

2 AR700 Series Router
C613-03087-00 Rev G
AR700 Series Router Hardware Reference
Document Number C613-03087-00 Rev G.
© 2005-2008 Allied Telesis Inc. All rights reserved. No part of this publication may be
reproduced without prior written permission from Allied Telesis Inc.
Allied Telesis Inc. reserves the right to change specifications and other information in
this document without prior written notice. The information provided herein is subject
to change without notice. In no event shall Allied Telesis Inc. be liable for any incidental,
special, indirect, or consequential damages whatsoever, including but not limited to lost
profits, arising out of or related to this manual or the information contained herein, even
if Allied Telesis Inc. has been advised of, known, or should have known, the possibility
of such damages.
All company names, logos, and product designs that are trademarks or registered
trademarks are the property of their respective owners.

Hardware Reference 3
C613-03087-00 Rev G
Contents
Devices Covered By This Document ................................................................... 4
Hardware Overview .......................................................................................... 4
AR725 Router ................................................................................................... 5
Hardware Features ..................................................................................... 5
Power Supply ............................................................................................. 6
LEDs and What They Mean ......................................................................... 9
AR745 Router ................................................................................................. 10
Hardware Features ................................................................................... 10
Power Supply ........................................................................................... 12
LEDs and What They Mean ....................................................................... 14
AR750S Router ............................................................................................... 16
Hardware Features ................................................................................... 16
Power Supply ........................................................................................... 17
LEDs and What They Mean ....................................................................... 18
AR750S-DP Router .......................................................................................... 19
Hardware Features ................................................................................... 19
AT-PWR03 Power Supply Units ................................................................. 21
LEDs and What They Mean ....................................................................... 22
AR770S Router ............................................................................................... 23
Hardware Features ................................................................................... 23
Power Supply ........................................................................................... 25
LEDs and What They Mean ....................................................................... 26
Asynchronous Interfaces ................................................................................. 27
Expansion Options .......................................................................................... 28
AR740 RPS Redundant Power Supply (AT-AR725, AT-AR745 only) ............. 28
SFP Ports (AR770S only) ............................................................................ 31
PICs and NSMs ......................................................................................... 31
PCI Accelerator Cards (PACs) .................................................................... 32
Memory Options ............................................................................................. 34
Random Access Memory (RAM) ................................................................ 34
Onboard Flash Memory ............................................................................ 36
Battery-Backed RAM (AR725, AR745, AR770S only) ................................. 37
CompactFlash (AR725, AR745 only) ......................................................... 38
Cables and Loopback Plugs ............................................................................. 40
RS-232 Terminal and Modem Cables ........................................................ 40
Loopback Plugs for Testing Interfaces ....................................................... 45
Using AT-TFTP Server ....................................................................................... 47
Using Windows Terminal and Hyperterminal ................................................... 48
How the Router Starts Up ............................................................................... 51
Test Facility ..................................................................................................... 56
Restricted Maintenance Procedures ................................................................. 58
Diagnostics ............................................................................................... 58
Lithium Battery Replacement .................................................................... 60
For More Information ...................................................................................... 61
Document Sets ......................................................................................... 61
Viewing Documentation on the CD .......................................................... 61
Contacting Us .......................................................................................... 62

4 AR700 Series Router
C613-03087-00 Rev G
Devices Covered By This Document
This Hardware Reference includes information on the following devices:
■AR725 router
■AR745 router
■AR750S router
■AR750S-DP router
■AT-PWR03 power supply units
■AR770S router
Hardware Reference updates can be found at
www.alliedtelesis.com/support/software/.
Hardware Overview
All AR700 Series routers include Ethernet ports, asynchronous ports, and PIC
bays; the AR750S, AR750S-DP and AR770S also have switch ports. PIC bays
add expansion flexibility by allowing the installation of PIC cards, which are
available with additional interfaces, such as ISDN (PRI E1/T1, BRI S/T),
synchronous, or asynchronous ports. The AT-AR745 routers also have an
expansion bay to accommodate a Network Service Module (NSM), which either
directly provides further interfaces, or provides multiple slots where additional
PIC interfaces can be added.
The AR725 and AR745 routers have a dedicated PCI Accelerator Card (PAC)
slot that accommodates special purpose PAC coprocessor cards. PAC cards
provide additional functionality or performance, such as compression or
encryption, through a high performance PCI bus, but do not add extra
interfaces. The AR750S and the AR750S-DP have built-in high performance
encryption processing.
AR700 Series models are distinguished by the number and types of ports and
presence or absence of an NSM bay and/or PCI Accelerator Card (PAC) slot.
Table 1: Interface configurations for AR700 Series routers
AR700 Series
Model
Ethernet
(Eth) Ports
Ethernet
Switch Ports
Asynchronous
Ports PIC Bays
NSM
Bays PAC Slot
AT-AR725 2 (10/100) - 2 2 - 1
AT-AR745 2 (10/100) - 2 2 1 1
AT-AR750S 2 (10/100) 5 (10/100) 1 2 - built in
encryption
AT-AR750S-DP 2 (10/100) 5 (10/100) 1 2 - built in
encryption
AT-AR770S 2 (fibre-optic SFP
or 10/100/1000)
4 (10/100/1000) 1 2 - built in
encryption

Hardware Reference 5
C613-03087-00 Rev G
AR725 Router
The AT-AR725 router consists of a base CPU card, enclosure and power supply.
The base CPU card supports dual 10/100 autonegotiating Ethernet LAN (eth)
ports and two asynchronous RS-232 ports.
Figure 1: Front and rear panels of the AR725 Series router
Figure 1 shows the AT-AR725 router’s front and rear panels (with a PIC
installed in each PIC bay). “LEDs and What They Mean” on page 9 lists
functions of the AT-AR725’s LEDs. Additional rear panel LEDs may be present
if PICs are installed. Functions of LEDs on PICs are described in the Port
Interface Card Quick Install Guide and Port Interface Card Hardware Reference.
Hardware Features
Main hardware features of the AT-AR725 are:
■80 MHz RISC processor
■1 MByte of EPROM
■128 MBytes of synchronous DRAM (DIMM module)
■16 MBytes of on-board flash memory
■CompactFlash slot
■128 KBytes of battery backed SRAM
■2 high performance autonegotiating full duplex 10/100 Fast Ethernet LAN
ports
■2 RS-232 asynchronous serial ports
■2 PIC bays
■A PAC compression/encryption card slot
■Connector for a Redundant Power Supply (RPS)
■-48 V DC power supply option
Asynchronous
ports
Power switch
AC power inlet Mac engine LEDs
and base LEDs
Ethernet ports
and LEDs
Base LEDs
Two PIC bays with PICs installed
DC power inlet for RPS
Rear Panel
Front Panel
Compact Flash
725FRP
Data
ETH
Link
Data
ETH
Link
AC POWER
100-240 VAC
50-60 Hz
1.0 A
5V/5.5A
12V/1.0A
-12V/0.1A
RPS DC POWER
L/A L/A
100M ETHERNET 1
ENGINE
ACT
PWR
DAT
RUN
ER
SYS
CLR
SEC PORT 1 PORT 0
PIC 0
BASE
PIC 1
PIC 0
100M
PIC 1
ETHERNET 0
DISCONNECT POWER BEFORE INSTALLING/REMOVING PIC
STATUS
SECURITYPOWER RUN SYSTEM CLEAR
AR725
Enterprise Router
ACTIVITY
COMPACT FLASH

6 AR700 Series Router
C613-03087-00 Rev G
Asynchronous Ports 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
•1stopbit
•Noparity
• Hardware flow control
PIC Bays The chassis has two Port Interface Card (PIC) bays, which can accommodate any
combination of the following PICs:
■AT-AR020 PRI E1/T1 PIC, one primary rate E1/T1 port
■AT-AR021(S) BRI-S/T PIC, one basic rate ISDN S/T port
■AT-AR021(U) BRI-U PIC, one basic rate ISDN U port
■AT-AR022 ETH PIC, one Ethernet LAN AUI/10BASE-T port
■AT-AR023 SYN PIC, one synchronous port with universal 50-way
AMPLIMITE connector
■AT-AR024 ASYN4 PIC, four asynchronous ports with R-J45 connectors
■AT-AR026 4ETH PIC, four 10BASE-T/100BASE-TX ports with RJ-45
connectors
■AT-AR027 VoIP-FXS PIC, two Foreign Exchange Subscriber (FXS) ports
with RJ-11 connectors
CompactFlash slot The AT-AR725 has a CompactFlash slot on its front panel. For information on
CompactFlash, including a list of compatible flash cards, see “CompactFlash
(AR725, AR745 only)” on page 38.
PAC slot The AT-AR725 router has a single PAC slot inside the chassis. When installed,
PACs provide hardware-based encryption and or compression capability via a
PCI interface. For information on PACs, including a list of compatible PACs,
see “PCI Accelerator Cards (PACs)” on page 32.
Power Supply
The AT-AR725 is available in two power supply configurations: a universal AC
model and a 48V 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-AR725 or AT-AR745 routers.
AT-AR725 AC AC models of the AT-AR725 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 7.
The router can monitor the PSU and the fan in both the router and the RPS. See
“LEDs and What They Mean” on page 9 for more information.

Hardware Reference 7
C613-03087-00 Rev G
AT-AR725-80 DC The AT-AR725-80, designed for use by telecommunication carrier sites,
supports connection to a 48V DC power supply (in the range 39 to 60 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 mm2(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 2: DC Power inlet terminals on an AR725
Safety Safety information and instructions outlining how to connect an AT-
AR725-80 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.
Redundant Power
Supply (RPS)
AC models of the AT-AR725 can be used in conjunction with the AR740 RPS.
Each AR740 RPS can provide power supply and mains circuit redundancy for
up to two AT-AR725s or AT-AR745s. For more information on the AR740 RPS,
see “AR740 RPS Redundant Power Supply (AT-AR725, AT-AR745 only)” on
page 28.
For connection to an AR740 RPS, the AT-AR725 router has a female DB25
connector on its rear panel (Figure 3 on page 8). Pin outs for the connector are
listed in Table 2 on page 8.
3
1
FOR CENTRALIZED DC
POWER CONNECTION,
INSTALL ONLY IN A
RESTRICTED AREA
38-60 VDC , 2 A
DC POWER

8 AR700 Series Router
C613-03087-00 Rev G
Figure 3: DB25 female connector pinout for an RPS on the AT-AR725 rear panel
Table 2: DB25 RPS power connector pin out on the AT-AR725
Pin Function Direction
1, 25 Keying -
2, 14 +12 V input
3-5, 15-17 +5 V input
6-8, 18-20 0 V input
9 -12 V input
10 VCC output
11 Main PSU error output
12 Main fan error output
13 RPS disconnected input
21 Sense 0 V output
22 Sense +5 V output
23 RPS PSU error output
24 RPS fan error input
Pin 25 Pin 14
Pin 13 Pin 1
A740db25

Hardware Reference 9
C613-03087-00 Rev G
LEDs and What They Mean
Functions of the AR725’s LEDs are shown in the following table. Additional
rear panel LEDs may be present if a PIC or NSM is installed. Functions of PIC
and NSM LEDs are described in their respective Hardware References.
LED Function
Front panel Rear panel
ETH These LEDs give indications about the Ethernet
interfaces.There are two LEDs for each Eth port.
L/A (Link/Activity) Lit green when the Ethernet interface is connected to
a device (e.g., a hub), which is generating link pulses.
Blinks yellow when data is being transmitted or
received on the Ethernet interface.
100M Lit when the Ethernet interface is in 100 Mbps mode.
PIC0/PIC1 Lit when a PIC is inserted in either PIC bay 0 or PIC
bay 1 (one LED for each PIC).
BASE These LEDs indicate the state of the main router unit.
Power PWR Lit when power is supplied and the router is switched
on.
Run RUN Lit when the internal processor is executing code. If
the processor stops for any reason (a fault condition),
then the LED will not be lit.
System SYS This LED is not normally lit. It is used to signal various
system conditions (e.g., when the processor executes
the reboot sequence). Generally it signals a possible
fault condition, but it is lit during a power-up or
operator initiated reboot, and remains lit until a
software version has been loaded from flash
memory.
Security SEC Lit when a user is logged in with SECURITY OFFICER
privilege and the router is in SECURITY MODE.
Activity
(Compact Flash)
Lit when the compact flash card is accessed.
Do not remove the compact flash card when the
LED is lit.
ENGINE These LEDs give indications about PAC (PCI
Accelerator Card), which can be installed for
encryption and/or compression purposes.
ACT Lit when a PAC is installed in the PAC slot.
DAT Lit when data is transferred to or from the PAC.
ERR Lit when there is an error in the data transmission to
or from the PAC.
Clear CLR Lit when a secure router has enabled PPP interfaces
or Frame Relay circuits that are configured to send
clear text.

10 AR700 Series Router
C613-03087-00 Rev G
AR745 Router
The AT-AR745 router consists of a base CPU card, enclosure, and power
supply. The base CPU card supports two 10/100 autonegotiating Ethernet
LAN (eth) ports and two asynchronous RS-232 ports.
The following figure displays the front and rear panels of the AT-AR745 router
with a Port Interface Card (PIC) installed in each PIC bay, and an AT-AR040 4-
PIC NSM installed in the NSM bay.
Figure 4: Front and rear panels of the AT-AR745 router
Hardware Features
Main hardware features of the AT-AR745 are:
■80 MHz RISC processor
■1 MByte of EPROM
■128 MBytes of synchronous DRAM (DIMM module)
■16 MBytes of on-board flash memory
■CompactFlash slot
■128 KBytes of battery-backed SRAM (NVS)
■2 x 10/100 Mbps autonegotiating full-duplex Ethernet LAN (eth) ports
■2 RS-232 asynchronous serial ports
■2 PIC bays
■1 hot swappable Network Service Module (NSM) bay
■1 PAC slot for PAC compression and/or encryption cards
■Connector for a Redundant Power Supply (RPS)
■-48 V DC power supply option
SYN
Tx
Rx
SYN
Tx
Rx
ASYN
30
Data
ETH
Link
Data
ETH
Link
ASYN
30
3
1
2
0
Asynchronous
ports
Power switch
AC power inlet PAC engine
and base LEDs
NSM Hot
Swap button
and LEDs
Ethernet ports
and LEDs
745FRP
LEDs
Two PIC bays with PICs installed
DC power inlet for RPS
Rear Panel
Front Panel
Compact Flash
AC POWER
100-240 VAC
50-60 Hz
1.0 A
5V/5.5A
12V/1.0A
-12V/0.1A
RPS DC POWER
L/A L/A
SWAPNSM 0
HOT
SWAP
IN 100M ETHERNET 1
ENGINE
ACT
PWR
DAT
RUN
ER
SYS
CLR
SEC PORT 1 PORT 0
PIC 0
BASE
PIC 1
PIC 0
100M
PIC 1
ETHERNET 0
DISCONNECT POWER BEFORE INSTALLING/REMOVING PIC
STATUS
SECURITYPOWER RUN SYSTEM CLEAR
AR745
Modular Enterprise Router
ACTIVITY
COMPACT FLASH
NSM bay with
AT-AR040 4-PIC NSM and PICs installed

Hardware Reference 11
C613-03087-00 Rev G
PIC bays and NSM
bay
The AT-AR745 chassis has two PIC bays. A further four PIC bays can be added
if an AT-AR040 NSM is installed in the NSM bay.
The NSM bay allows one NSM to be installed in the chassis. NSMs either have
fixed ports (e.g., AT-AR041 and AT-AR042 BRI S/T NSMs) or PIC bays (e.g.,
the AT-AR040 4 PIC NSM). For detailed information on NSMs, see the Network
Service Module Hardware Reference.
The PIC bays and the 4-PIC NSM can accommodate combinations of the
following PICs (with a maximum of two E1/T1/PRI cards):
■AT-AR020 PRI E1/T1 PIC, one primary rate E1/T1 port
■AT-AR021(S) BRI-S/T PIC, one basic rate ISDN S/T port
■AT-AR021(U) BRI-U PIC, one basic rate ISDN U port
■AT-AR023 SYN PIC, one synchronous port with universal 50-way
AMPLIMITE connector
■AT-AR024 ASYN4 PIC, four asynchronous ports with RJ-45 connectors
■AT-AR027 VoIP-FXS PIC, two Foreign Exchange Subscriber (FXS) ports
with RJ-11 connectors
Recommendation AT-AR022 ETH PICs and AT-AR026 4ETH PICs are not
recommended for use in NSM PIC bays, as performance of these interfaces is
likely to be reduced and packet loss may occur. When used with an AR745
router, ETH PICs should be installed in the router’s PIC bay 0 or PIC bay 1.
Asynchronous Ports 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
•1stopbit
•noparity
• hardware flow control
PAC Slot AT-AR745 routers have a single PAC slot inside the chassis. When installed,
PACs provide hardware-based encryption and or compression capability via a
PCI interface. For information on PACs, including a list of compatible PACs,
see “PCI Accelerator Cards (PACs)” on page 32.
!Caution PACs should only be installed by authorised service
personnel. Unauthorised opening of the router lid may cause danger of
injury from electric shock, damage to the router, and invalidation of
the product warranty.

12 AR700 Series Router
C613-03087-00 Rev G
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 13.
The router can monitor the PSU and the fan in both the router and the RPS. See
“LEDs and What They Mean” on page 14 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 38 V to 60 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 mm2(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

Hardware Reference 13
C613-03087-00 Rev G
Redundant Power
Supply (RPS)
AC models of the AT-AR745 can be used in conjunction with the AR740 RPS.
Each AR740 RPS can provide power supply and mains circuit redundancy for
up to two AT-AR745s or AT-AR725s. For more information on the AR740 RPS,
see “AR740 RPS Redundant Power Supply (AT-AR725, AT-AR745 only)” on
page 28.
For connection to an AR740 RPS, the AT-AR745 router has a female DB25
connector on its rear panel (Figure 6). Pin outs for the connector are listed in
Table 3.
Figure 6: DB25 female connector pinout for an RPS on the AT-AR745 rear panel
Table 3: DB25 RPS power connector pin out on the AT-AR745
Pin Function Direction
1, 25 Keying -
2, 14 +12 V input
3-5, 15-17 +5 V input
6-8, 18-20 0 V input
9 -12 V input
10 VCC output
11 Main PSU error output
12 Main fan error output
13 RPS disconnected input
21 Sense 0 V output
22 Sense +5 V output
23 RPS PSU error output
24 RPS fan error input
Pin 25 Pin 14
Pin 13 Pin 1
A740db25

14 AR700 Series Router
C613-03087-00 Rev G
LEDs and What They Mean
Functions of the AR745’s LEDs are shown in the following table. Additional
rear panel LEDs may be present if a PIC or NSM is installed. Functions of PIC
and NSM LEDs are described in their respective Hardware References.
1. AT-AR021 (S) BRI-S/T, AT-AR021 (U) BRI-U, AT-AR022 ETH, AT-AR023 SYN, and AT-AR026 4ETH PICs can be hot swapped.
LED Function
Front panel Rear panel
ETH These LEDs give indications about the Ethernet interfaces.
LNK/ACT Lit green when the Ethernet interface is connected to a device (e.g., a hub) which is
generating link pulses. Lit yellow indicates transmission or reception activity.
100M Lit when the Ethernet interface is in 100 Mbps mode.
PIC0/PIC1 Lit when a PIC is inserted in either PIC bay 0 or PIC bay 1 (one LED for each PIC).
BASE These LEDs indicate the state of the main router unit.
Power PWR Lit when power is supplied and the router is switched on.
Run RUN Lit when the internal processor is executing code. If the processor stops for any reason
(a fault condition), then the LED will not be lit.
System SYS Lit when the router or management software is malfunctioning. Flashes to indicate fan,
PSU, and RPS faults.
1 Flash: A router fan has failed.
2 Flashes: If an RPS is connected and RPS monitoring is enabled, an RPS fan has failed.
3 Flashes: If an RPS is connected, the router’s PSU (Power Supply Unit) has failed.
4 Flashes: If RPS monitoring is enabled, the RPS PSU has failed.
5 Flashes: If RPS monitoring is enabled, an RPS is not connected or is not operational
Security SEC Lit when a user is logged in with SECURITY OFFICER privilege and the router is in
SECURITY MODE.
Activity
(Compact Flash)
Lit when the compact flash card is accessed.
Do not remove the compact flash card when the LED is lit.
ENGINE These LEDs give indications about a PCI Accelerator Card (PAC), which can be installed
for encryption and/or compression purposes.
ACT Lit when a PAC is installed in the PAC slot.
DAT Lit when data is transferred to or from the PAC.
ERR Lit when there is an error in the data transmission to or from the PAC.
Clear CLR Lit when a secure router has enabled PPP interfaces or Frame Relay circuits that are
configured to send clear text.
NSM These LEDs give indications about an NSM installed in the router.
Swap Lit when the NSM and its PICs are powered down and can be hot swapped. Only lights
if the Hot Swap button has been pressed and the software version supports hot
swapping1.
In Use Lit when an NSM is correctly installed. If the software version supports hot swapping,
it indicates that the NSM and its PICs are powered up and may not be swapped.

Hardware Reference 15
C613-03087-00 Rev G
The AT-AR745 router automatically monitors its own power supply and fan,
and has the option of a redundant power supply. If a redundant power supply
(RPS) is attached, the AT-AR745 software can detect the presence of the RPS
and the state of its output voltages and fan. RPS monitoring, turned off by
default, can be turned on or off using the command:
set system rpsmonitor={on|off}
The show system command displays the state of the main power supply and
fan, and whether or not the RPS is being monitored. If RPS monitoring is
enabled, it also shows whether an RPS is connected, and the state of its output
voltage and fan.
When a fault occurs in the main power supply or fan, system LEDs on the
AT-AR745’s front and back panels are flashed in a pattern that identifies the
fault. If RPS monitoring is enabled, the system LEDs also flash to indicate
failures in the RPS connection, power supply or fan. Multiple faults are
indicated by cycling through each error code.

16 AR700 Series Router
C613-03087-00 Rev G
AR750S Router
The AT-AR750S router has two 10/100 autonegotiating Ethernet (eth) ports,
one asynchronous RS-232 port, five Ethernet switch ports, and two Port
Interface Card (PIC) expansion bays.
Figure 7: Front and rear panels of the AT-AR750S router
Hardware Features
The main hardware features of the AT-AR750S are:
■533 MHz PowerPC processor
■64 MBytes of synchronous DRAM
■16 MBytes of on-board flash memory, (1 MByte reserved for boot code)
■High performance security engine (used for IPSec, SSL, 3DES, AES)
■2 x 10/100 Mbps autonegotiating full duplex Ethernet (eth) ports
■5 x 10/100 Mbps autonegotiating full duplex switch ports
■1 RS-232 asynchronous DTE console port, with RJ45 connector
■2 PIC bays
0
1
1
2
3 5 ASYN0 PIC BAYS
PIC0
PIC1
4
SYS
PWR
ETHERNETSTATUS
01
L/A
D/C
L/A
D/C
12345 0
1
SWITCH PORTS PIC
ETHERNET
CONSOLE
SWITCH PORTS
AR750S Secure VPN Router
Rear Panel
Eth
ports
Front Panel
PIC bays
Asynchronous
port
Switch
ports
Fan
vent
Power
inlet
Power
switch
PIC
LEDs
Eth
LEDs
Status
LEDs
Switch
port LEDs

Hardware Reference 17
C613-03087-00 Rev G
Asynchronous port The asynchronous serial port (ASYN0) provides a general purpose port for
terminals, printers or modems. The port is wired as a DTE (Table 5 on page 27).
The default communications settings are:
• 9600 bps
• 8 data bits
•1stopbit
•noparity
• hardware flow control
PIC bays The AT-AR750S chassis has two PIC bays, which can accommodate
combinations of the following PICs:
■AT-AR020 PRI E1/T1 PIC, one primary rate E1/T1 port.
■AT-AR021(S) BRI-S/T PIC, one basic rate ISDN S/T port.
■AT-AR023 SYN PIC, one synchronous port with universal 50-way
AMPLIMITE connector.
■AT-AR024 ASYN4 PIC, four asynchronous ports with RJ-45 connectors.
Power Supply
The AT-AR750S has a universal AC input connector and a power switch on its
rear panel. It operates with an input voltage in the range 100 VAC to 240 VAC.

18 AR700 Series Router
C613-03087-00 Rev G
LEDs and What They Mean
Functions of the AR750S LEDs are shown in the following table. Additional
LEDs may be present if a PIC is installed. Functions of PIC LEDs are described
in the Port Interface Card Hardware Reference.
LED State Function
Power/PWR Green The router is receiving power and the power switch is ON.
System/SYS Off Normal operation.
Amber Lit briefly during router startup, or the router is
malfunctioning.
Flashing
1 flash
3 flashes
4 flashes
6 flashes
There is a fault. To check the router’s fan speed,
temperature, and internal voltages, use the show system
command.
The router fan has failed.
There is an internal power supply fault in the router.
There is a fault with the Redundant Power Supply
(RPS).
The router temperature is too high or too low. Put the
router in a location that will maintain an ambient
temperature range of 0 ºC to 50 ºC (32 ºF to 122 ºF), with
adequate airflow around the router and its vents.
PIC0
PIC1
Green A port interface card (PIC) is correctly installed and has
been detected by the router.
ETH0 / ETH1
L/A
Green The Eth port has a 100 Mbps link.
Amber The Eth port has a 10 Mbps link.
Flashing Data is being transmitted on the Eth port.
ETH0 / ETH1
D/C
Green The Eth port is operating at full duplex.
Amber The Eth port is operating at half duplex.
Amber
flashing
There is a collision on the Eth port.
PORT 1..5
L/A
Green The switch port has a 100 Mbps link.
Amber The switch port has a 10 Mbps link.
Flashing Data is being transmitted on the switch port.
PORT 1..5
D/C
Green The switch port is operating at full duplex.
Amber The switch port is operating at half duplex.
Amber
flashing
Collision on the switch port.

Hardware Reference 19
C613-03087-00 Rev G
AR750S-DP Router
The AT-AR750S-DP router has two 10/100 Mbps autonegotiating Ethernet
(eth) ports, one asynchronous RS-232 port, five 10/100 Mbps Ethernet switch
ports, and two Port Interface Card (PIC) expansion bays.
The AT-AR750S-DP uses AT-PWR03 dual hot-swappable power supplies
(PSUs). You can install either AC or DC PSUs.
Figure 8: Front and rear panels of the AT-AR750S-DP router
Hardware Features
The main hardware features of the AT-AR750S-DP are:
■533 MHz PowerPC processor
■64 MBytes of synchronous DRAM
■16 MBytes of on-board flash memory, (1 MByte reserved for boot code)
■2 x 10/100 Mbps autonegotiating full duplex Ethernet (eth) ports
■5 x 10/100 Mbps autonegotiating full duplex switch ports
■1 RS-232 asynchronous DTE console port, with RJ45 connector
■2 PIC bays
■High performance security engine (used for IPSec, SSL, 3DES, AES)
■2 PSU bays compatible with dual hot-swappable, load sharing PSUs
■Reset button
Rear Panel
Eth
ports
Front Panel
Switch
ports
Power
inlet
Run/standby switch
(DC PSU only)
PIC
LEDs
Eth
LEDs
Status
LEDs
Switch
port LEDs
FOR CENTRALIZED DC POWER CONNECTION, INSTALL ONLY IN A RESTRICTED AREA
CAUTION: DISCONNECT ALL POWER AT SOURCETO DISABLE SYSTEM POWER
40-60VDC , 2.0A
AT-PWR03
DC Power Supply
FOR CENTRALIZED DC POWER CONNECTION, INSTALL ONLY IN A RESTRICTED AREA
CAUTION: DISCONNECT ALL POWER AT SOURCETO DISABLE SYSTEM POWER
40-60VDC , 2.0A
AT-PWR03
DC Power Supply
PSU 2
PSU 1
RESET PSU 1
PSU 2
0
1
1
2
3 5 ASYN0 PIC BAYS
PIC0
PIC1
4
SYS
ETHERNETSTATUS
01
L/A
D/C
12345 0
1
SWITCH PORTS PIC
ETHERNET CONSOLESWITCH PORTS
L/A
D/C
AR750S-DP Secure VPN Router
Reset
button
Asynchronous
port
PIC
bays
PSU Bay Two (PWR03 DC installed) PSU Bay One (PWR03 DC installed)

20 AR700 Series Router
C613-03087-00 Rev G
Asynchronous port The asynchronous serial port (ASYN0) provides a general purpose port for
terminals, printers or modems. The port is wired as a DTE (Table 5 on page 27).
The default communications settings are:
• 9600 bps
• 8 data bits
•1stopbit
•noparity
• hardware flow control
PIC bays The AT-AR750S-DP chassis has two PIC bays, which can accommodate
combinations of the following PICs:
■AT-AR020 PRI E1/T1 PIC, one primary rate E1/T1 port.
■AT-AR021(S) BRI-S/T PIC, one basic rate ISDN S/T port.
■AT-AR023 SYN PIC, one synchronous port with universal 50-way
AMPLIMITE connector.
■AT-AR024 ASYN4 PIC, four asynchronous ports with RJ-45 connectors.
Restart with default
configuration
To restart the router with the default configuration, either press the Reset
button on the front panel of the router, or use the command:
restart router config=none
This immediately restarts the router with the default configuration specified in
the boot.cfg file. The factory-loaded default configuration is shown in the
Installation and Safety Guide. If the file has been removed, the router restarts
with no configuration. We recommend leaving boot.cfg unchanged, so that
you can revert to the original configuration if necessary.
To return the router to the previous user configuration, restart the router by
using the command:
restart router
This restarts the router with the startup configuration file previously specified
by the command:
set config=filename
The restart reboot command or a power cycle also reload this user
configuration. For information about configuration files, see the Managing
Configuration Files and Software Versions chapter in the Software Reference.