Allied Telesis AT-AR240E User manual

ADSL
Bridge/Routers
AT-AR240E
AT-AR250E
K
User’s
Guide
®
PN 613-50197-00 Rev A

Copyright  2001 Allied Telesyn International, Corp.
960 Stewart Drive Suite , Sunnyvale, CA 94085 USA
All rights reserved. No part of this publication may be reproduced without prior written permission from
Allied Telesyn International, Corp.
All other product names, company names, logos or other designations mentioned herein are trademarks
or registered trademarks of their respective owners.
Allied Telesyn International, Corp. reserves the right to make changes in specifications and other
information contained in this document without prior written notice. The information provided herein is
subject to change without notice. In no event shall Allied Telesyn International, Corp. 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
Telesyn International, Corp. has been advised of, known, or should have known, the possibility of such
damages.

FCC Notice
iii
FCC NOTICE
According to Federal Communications Commission (FCC) Rules
regarding radio frequency emissions, the ADSL device complies
with FCC Part 15 for Class B computing devices. The following
paragraph is required by the FCC.
This equipment generates, uses and can radiate radio frequency
energy and if not installed and used in accordance with this
document, may cause interference to radio communications. It
has been tested and found to comply with the limits for a Class B
computing device pursuant to Part 15 of FCC Rules. These limits
are designed to provide reasonable protection against such
interference when the equipment is operated in a commercial
environment. Operation of this equipment in a residential area is
likely to cause interference, in which case, the user, at his own
expense, is required to take whatever measures may be necessary
to correct the interference. If this equipment does cause harmful
interference to radio or television reception, the user is
encouraged to try to correct the interference by one or more of the
following measures:
• Turn the equipment “OFF” and “ON”.
• Reorient or relocate the receiving antenna.
• Increase the distance between the equipment and the receiver.
• Connect the equipment to an outlet on a circuit different from
that to which the receiver is connected.

FCC Notice
iv
NOTE
Any changes or modifications not
expressly approved by the grantee of
this device could void the user’s
authority to operate the equipment.
Meets Canadian D.O.C.
This product conforms with Canadian Class B Emissions
Regulations.
Meets Approvals
Safety : FCC Part 68, EN60950, UL 1950, C/UL to CSA 22.2
No.950, TUV, IC CS03
Emissions : FCC Part 15 Class B, EN55022 / CISPR2 Class B
Immunity : EN55024
Warning
Use minimum of 26 AWG line cord for the DSL
connection.

Table of Contents
v
TABLE OF CONTENTS
FCC Notice ........................................................................................iii
Introduction ....................................................................................viii
Package Contents ...............................................................................ix
Minimum PC Requirements ...............................................................ix
Chapter 1
Product Description .......................................................................... 1
1.1 Introduction ..................................................................................1
1.2 Product Description ...................................................................... 2
1.3 Front Status Indicators ..................................................................3
1.4 AT-AR240E Rear Panel ............................................................... 4
1.5 AT-AR250E Rear Panel ............................................................... 5
1.6 System Inter-operability ............................................................... 6
1.7 System Interface (LAN) ............................................................... 7
1.8 System Interface (DSL) ................................................................ 8
1.9 Installation and Configuration ...................................................... 8
Chapter 2
Operation ...........................................................................................9
2.1 Introduction ..................................................................................9
2.2 System Description ..................................................................... 10
2.3 Routing ....................................................................................... 10
2.4 Network Address Translation ..................................................... 11
2.5 Static Routing ............................................................................. 12
2.6 Bridging ......................................................................................12
2.7 Point-to-Point Protocol ............................................................... 13
2.8 Security ....................................................................................... 14
2.9 PC Setup for Telnet ....................................................................15

Table of Contents
vi
2.10 USB Port Setup ........................................................................16
2.11 ADSL Transmission ................................................................. 17
2.12 ATM Transmission ................................................................... 17
2.13 BOOTP Download Procedure .................................................. 18
2.14 Updating Firmware via TFTP .................................................. 22
Chapter 3
Applications ..................................................................................... 25
3.1 Introduction ................................................................................25
3.2 High-Speed Internet Access ....................................................... 26
3.3 Remote Locations Connectivity ................................................. 27
3.4 LAN-to-LAN Connectivity ........................................................ 28
Chapter 4
Advanced Configuration ................................................................. 29
4.1 Introduction ................................................................................29
4.2 Accessing the Advanced Configuration Mode ...........................30
4.3 Main Statistics Screen ................................................................31
4.4 File Drop-down Menu ................................................................32
4.5 Configuration Drop-down Menu ................................................ 33
4.5.1 Configuration Menu - Advanced Configuration .............. 34
4.5.2 Configuration Menu - Security ........................................ 35
4.6 Operation Drop-down Menu ...................................................... 37
4.6.1 Operation Menu - View Performance .............................. 37
4.7 Help Menu ..................................................................................38
Chapter 5
Command Line Interface Commands ........................................... 39
5.1 Introduction ................................................................................39
5.2 Changing the Password .............................................................. 40
5.3 Update Flash Memory ................................................................40
5.4 System Console Commands ....................................................... 41
5.4.1 Bridge Commands .......................................................... 41
5.4.2 DHCP Client Commands ................................................. 44

Table of Contents
vii
5.4.3 DHCP Server Commands ................................................ 46
5.4.4 NAT Commands ..............................................................48
5.4.5 PPP Commands ................................................................ 52
5.4.6 RFC1483 Commands ....................................................... 59
5.4.7 TCP/IP Commands ..........................................................59
5.4.8 TFTP Commands ............................................................. 70
5.5 ADSL Commands ...................................................................... 71
5.5.1 Help ..................................................................................71
5.5.2 Info ................................................................................... 72
5.5.3 Setting ..............................................................................72
5.5.4 Activate ............................................................................75
5.5.5 Loopback ......................................................................... 76
5.5.6 Status ................................................................................77
5.5.7 ATM ................................................................................. 79
5.5.8 Performance ..................................................................... 80
5.5.9 Debug ............................................................................... 81
5.5.10 HTUType ....................................................................... 84
5.6 Advanced CLI Commands ......................................................... 84
5.6.1 Bridge Settings ................................................................. 84
Appendix A
Troubleshooting Guide ................................................................... 97
Appendix B
Specifications of AT-AR240E .......................................................107
Appendix C
Specifications of AT-AR250E .......................................................111
Appendix D
Interface Pin Assignments ............................................................ 115
Appendix E
Default Settings ..............................................................................116

Introduction
viii
Introduction
The Broadband Intelligent Home Gateway (BIHG) is an emerging
new class of CPE device that grows with the home network without
requiring Service Providers to change their DSL provisioning.
Regardless if the connection is through the USB or the Ethernet
port, you are always on. For network expansion, a hub can be con-
nected to the Ethernet port.
The AT-AR240E and the AT-AR250E capabilities save money
during deployment by provisioning longer reach with more reliable
turn up, less truck rolls and more customer satisfaction by using the
BIHG feature. Both the AT-AR240E and the AT-AR250E’s
flexibility enables it to be set as a router to accommodate more
advanced business applications.
With the ADSL device, investments are protected through the
support of popular DSL connection models which are also industry-
standard interface options such as PPP over Ethernet (PPPoE) and
PPP over ATM (PPPoA), Bridging and Routing.

Introduction
ix
Package Contents
1. AT-AR240E OR AT-AR250E ADSL Bridge/Router
2. DSL Cable (RJ-11, green cable)
3. Ethernet Cable (RJ-45, yellow cable)
4. USB Cable (grey cable)
5. Power Cord (not included with the AT-AR250E)
6. Power Adapter
7. CD with the GUI, USB Drivers and Documentation
Minimum PC Requirements
= A PC with an installed 10BaseT Ethernet card or USB interface.
= TCP/IP network protocol installed on the PC.
= Windows 95 (USB port may have some compatibility issues),
Windows 98, Windows 2000, Windows NT 4.0 (no support for
USB) or Windows Me.
= For Ethernet connectivity to the ADSL devices, any Operating
System with the TCP/IP protocol such as Linux, Mac, OS2 may
be used.

Chapter 1
1
C HAPTER
1
P RODUCT D ESCRIPTION
1.1 Introduction
This chapter describes the physical and functional properties of the
AT-AR240E and the AT-AR250E ADSL Bridge/Router.

Chapter 1
2
1.2 Product Description
Using industry-standard Discrete Multi-Tone (DMT) technology, the ADSL
device interfaces to any ITU G.dmt, UAWG, G.lite and ANSI T1.413, Issue 2
compliant, Central Office equipment at speeds of 8 Mbps downstream and
1 Mbps upstream (depending on the distance from the Central Office, selectable
in increments of 32kbps). The Central Office equipment provides
Asynchronous Transfer Mode (ATM) aggregation over ADSL on each copper
loop.
A fully integrated IP router featuring Network Address Translation (NAT)
automatically assigns local IP addresses and protects network security by not
advertising the internal address or network topology. A built-in Dynamic Host
Configuration Protocol (DHCP) Server assigns IP addresses to all LAN stations.
The AT-AR250E includes an integral 4-port Ethernet Bridge/Router supporting
a directly connected PC from any of its Ethernet ports. or a network of cascaded
LAN hubs.
The AT-AR240E and the AT-AR250E both offer Password Protection and User
Authentication (PAP/CHAP) with PPP to prevent inadvertent access to the
router through the Internet. It also enables Telnet management access.

Chapter 1
3
1.3 Front Status Indicators
The AT-AR240E and the AT-AR250E are compact, light-weight
communications devices with the following dimensions:
" Height : 1.5"
" Width : 8"
" Depth : 6"
" Weight : 1.5 lbs
" Color : Off White
Figure 1: Front Status Indicators
LED COLOR EXPLANATION
POWER Green
(solid) It will illuminate as soon as the device is powered ON and will remain on till the device is turned OFF. If this LED remains OFF,
the device needs to be serviced. Please refer to the Repair
Service Procedure.
SYNC Green
(solid) It illuminates to indicate successful DSL connection to the Network.
ALARM Red
(solid) It indicates the device encountering an error. If this LED remains ON, it means it cannot sync up to the device. Check the cable
connections or settings.
ATM ACT Green
(blinking) The ATM Activity LED shows data traffic. During normal operation, it should be blinking.
POWER
ALARM
ATMACT
SYNC
POWER
SYNC
ALARM
ATM ACT

Chapter 1
4
1.4 AT-AR240E Rear Panel
Figure 2 : AT-AR240E Rear panel
EXPLANATION
DSL PORT RJ-11 port for DSL connection and requires a RJ-11 cable (provided).
POWER SWITCH Permits the device to be turned ON or OFF.
POWER
CONNECTOR A receptacle for the Power Adapter.
RESET SWITCH To return the device to factory settings.
ETHERNET PORT Allows the AT-AR240E to establish a connection directly to a PC or a
Hub and requires a RJ-45 auto crossing cable (provided). It has 2
LEDs. The (green) LED remains solid when linked to an active
Ethernet port and will blink when there is traffic. The (yellow) LED
indicates the speed utilized by the device.
USB PORT Allows a direct connection to a PC for greater flexibility and
simultaneous sharing of local resources and the ADSL line (cable
provided).
POWER
SYNC
ALARM
ATMACT
DSL POWER ETHERNET USB
ON
OFF
RJ11 RJ45
12V
DSL
Port Power
SwitchPower
Connector
Reset
Switch Ethernet
Port USB
Port

Chapter 1
5
1.5 AT-AR250E Rear Panel
Figure 3: AT-AR250E Rear panel
EXPLANATION
DSL PORT RJ-11 port for DSL connection and requires a RJ-11 cable
(provided).
RESET SWITCH To return the device to factory settings.
POWER
CONNECTOR A receptacle for the Power Adapter.
ETHERNET PORTS Allows the AT-AR250E to establish a connection directly to a PC or
a Hub from any of its 4 ports. It requires a RJ-45 auto crossing cable
(provided). The ports have the auto-crossing feature which allows
connection to any of the Ethernet ports. Each of the 4 ports have 2
LEDs. The (green) LED remains solid when linked to an active
Ethernet port and will blink when there is traffic. The (yellow) LED
indicates the speed utilized by the device. It will be lit when the
speed is at 100Mbps and will be off when the speed is 10Mbps.
USB PORT Allows a direct connection to a PC for greater flexibility and
simultaneous sharing of local resources and the ADSL line (cable
provided).
POWER
SYNC
ALARM
ATMACT
DSL POWER ETHERNET USB
RJ11 4321
12V
DSL
Port PowerReset
Switch Ethernet
Ports USB
Port
Connector

Chapter 1
6
1.6 System Inter-operability
The ADSL device’s implementation of protocol standards ensures
inter-operability with PCs, LANs, Routers, Servers and Central Office
equipment such as voice and ATM switches. It also provides inter-operability
on the Physical, Data Link and Network layers.
The Physical Layer includes the hardware and electrical signaling
characteristics supported by the ADSL device’s Ethernet and IP router
interfaces. Compliance to ITU ADSL standards guarantees connectivity of the
ADSL device to the DSL Access Multiplexer (DSLAM) ports.
The Data Link Layer defines the transmission path of the data packets between
the two systems over the LAN and WAN physical links.
Figure 4: The AT-AR240E’s 10BaseT Ethernet port attaches directly to a
PC Ethernet port or an external Ethernet hub.
Figure 5: Any of the 4 Ethernet ports of the AT-AR250E attach directly to a
PC Ethernet port or an external Ethernet hub.
DSL ETHERNET USBPOWER
RJ-11 RJ-45
12V
ON
OFF
DSL ETHERNET USB
POWER
RJ-11 RJ-45

Chapter 1
7
1.7 System Interface (LAN)
The AT-AR240E supports Ethernet LANs through its {RJ-45} Ethernet
10BaseT port which acts as a mini-hub. AT-AR250E may be configured to
cascade hubs through its {RJ-45} Ethernet 10/100BaseT ports which acts as a
mini-hub too.
Figure 6: Demonstrates cascading hubs using the Ethernet port of the AT-
AR240E.
Figure 7: Demonstrates cascading hubs using any of the 4 Ethernet ports of
the AT-AR250E.
Hub1
Hub2
DSL ETHERNET USBPOWER
RJ-11 RJ-45
ON
OFF 12V
DSL ETHERNET USBPOWER
RJ-11 RJ-45
Hub1
Hub2

Chapter 1
8
1.8 System Interface (DSL)
The ADSL device is connected by a RJ-11 connector to an ADSL line.
Figure 8: For a typical installation, the voice terminals of the splitter are
connected to the existing house phone wiring. A separate line is
connected from the data terminals of the splitter to a RJ-11 wall
jack. The ADSL device is connected through the DSL {RJ-11}
jack on the Rear panel to this ADSL {RJ-11} wall jack.
1.9 Installation and Configuration
For information on:
•Hardware installation procedures
•Connecting the PC to the ADSL device
•How to install the USB driver
•Configuring the PC for the USB
Please refer to the User’sManual
ADSL
POTS
Splitter
Wall
Jack
Wall
Jack Telephone
Central
Office
DSLAM
Ethernet Hub
AT-AR240E
DSL ETHERNET USBPOWER
RJ-11 RJ-45
ON
OFF 12V

Chapter 2
9
C HAPTER
2
O PERATION
2.1 Introduction
The following section describes the ADSL devices, their Ethernet and USB
ports transmission, ATM and ADSL transmission as well as Security and
System Management.

Chapter 2
10
2.2 System Description
The ADSL devices provide asymmetric data transport from the Customer’s
network to a DSLAM at the Central Office. It can be deployed over existing
copper loops already supporting a plain old telephone service (POTS).
The ADSL devices configuration consists of the device at the Customer
premises interfacing with an ADSL standard compliant line card in a Digital
Subscriber Line Access Multiplexer (DSLAM) at the Central Office. Its very
rich feature set includes an easy-to-use Setup Wizard and DHCP support for
Plug-and-Play installation. It also provides an extensive Firewall for network
protection, and VPN capabilities for reduced cost of remote access
communications.
The AT-AR240E and the AT-AR250E can be configured and managed locally
or remotely via a PC connected to the remote unit, or using the Command Line
Interface (CLI) through a Telnet session, or through a Windows-based
configuration tool.
The ADSL devices support Permanent Virtual Circuits (PVC). Each PVC is
represented by a numeric pair denoted as a Virtual Path Identifier (VPI) and
Virtual Circuit Identifier (VCI). A VPI is a number used to switch a logical
group of Virtual Circuits as a unit. A VCI is a number assigned to a single
circuit to distinguish its cell traffic from other circuits. Each 12-bit VPI has the
address range 0-4095 and each 16-bit VCI has the address range 0-65535.
The ADSL devices supports all PCs using standard Ethernet 10BaseT or
100BaseT and TCP/IP protocols.
2.3 Routing
The ADSL devices include full-featured integrated IP routers. To route a
packet, two basic functions are used:
1A path determination function- enables the device to select the
most appropriate interface to
transmit a packet.

Chapter 2
11
2A switching function - allows the device to accept a
packet from one protocol and
forward it to a second protocol.
When routing, the device accesses routing address tables to determine the best
path for each packet to take. Routing tables can either be seeded as a static path
or built dynamically from broadcast packet information. The ADSL devices
switch the internet protocol (IP) between the 10BaseT/LAN interface and the
ADSL/ATM interface. The device also supports the Routing Information
Protocol, RIP[v1.0] and RIP[v2.0] to collect path routing information.
2.4 Network Address Translation
Network Address Translation (NAT) provides a mechanism for private
networks to access registered networks, such as the Internet, without requiring a
registered subnet address. NAT eliminates the need for host IP numbering and
allows the same IP addresses to be used in multiple Internet.
With NAT, the LAN addresses are private. These addresses are translated to
public IP addresses when IP addresses are forwarded. The NAT translation
function is compatible with standard IP routing.