Cabletron Systems CyberSWITCH HSIM-W6 User manual

WIDE AREA1 WIDE AREA2 HSIM-W6
225700
TELCO
TELCO
CPU
LNK
STS
LNK
STS
LNK
STS
ASYNC
HSIM-W6
USER’S GUIDE

HSIM-W6 User’s Guide i
Notice
Cabletron Systems reserves the right to make changes in specifications and other information contained in this document without prior
notice. The reader should in all cases consult Cabletron Systems to determine whether any such changes have been made.
The hardware, firmware, or software described in this manual is subject to change without notice.
IN NO EVENT SHALL CABLETRON SYSTEMS BE LIABLE FOR ANY INCIDENTAL, INDIRECT, SPECIAL, OR
CONSEQUENTIAL DAMAGESWHATSOEVER (INCLUDING BUT NOT LIMITED TO LOST PROFITS)ARISING OUT OF OR
RELATED TO THIS MANUAL OR THE INFORMATION CONTAINED IN IT, EVEN IF CABLETRON SYSTEMS HAS BEEN
ADVISED OF, KNOWN, OR SHOULD HAVE KNOWN, THE POSSIBILITY OF SUCH DAMAGES.
 Copyright September 1997 by Cabletron Systems, Inc., P.O. Box 5005, Rochester, NH 03866-5005
All Rights Reserved
Printed in the United States of America
Part Number: 9032257-01 September 1997
Cabletron Systems , LANVIEW , QuickSET , and SPECTRUM are registered trademarks, and HSIM and QuickSTART are
trademarks of Cabletron Systems, Inc.
All other product names mentioned in this manual may be trademarks or registered trademarks of their respective companies.
FCC Notice
This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) this device may not cause
harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired
operation.
NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the
FCC rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment uses, generates, and can radiate radio frequency energy and if not installed in accordance
with the operator’s manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area
is likely to cause interference in which case the user will be required to correct the interference at his own expense.
WARNING: Changes or modifications made to this device which are not expressly approved by the party responsible for compliance
could void the user’s authority to operate the equipment.
DOC Notice
This digital apparatus does not exceed the ClassA limits for radio noise emissions from digital apparatus set out in the Radio
Interference Regulations of the Canadian Department of Communications.
Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques de la
class A prescrites dans le Règlement sur le brouillage radioélectrique édicté par le ministère des Communications du Canada.

Notice
ii HSIM-W6 User’s Guide
VCCI Notice
This is a Class A product based on the standard of the Voluntary Control Council for Interference by Information Technology
Equipment (VCCI). If this equipment is used in a domestic environment, radio disturbance may arise. When such trouble occurs, the
user may be required to take corrective actions.
Cabletron Systems, Inc. Program License Agreement
IMPORTANT: Before utilizing this product, carefully read this License Agreement.
This document is an agreement between you, the end user, and Cabletron Systems, Inc. (“Cabletron”) that sets forth your rights and
obligations with respect to the Cabletron software program (the “Program”) contained in this package. The Program may be contained
in firmware, chips or other media. BY UTILIZING THE ENCLOSED PRODUCT,YOUAREAGREEINGTO BECOME BOUND BY
THE TERMS OF THIS AGREEMENT, WHICH INCLUDES THE LICENSE AND THE LIMITATION OF WARRANTYAND
DISCLAIMER OF LIABILITY. IFYOU DO NOTAGREE TO THE TERMS OF THISAGREEMENT, PROMPTLY RETURN THE
UNUSED PRODUCT TO THE PLACE OF PURCHASE FOR A FULL REFUND.
Cabletron Software Program License
1. LICENSE. You have the right to use only the one (1) copy of the Program provided in this package subject to the terms and
conditions of this License Agreement.
You may not copy, reproduce or transmit any part of the Program except as permitted by the CopyrightAct of the United States or
as authorized in writing by Cabletron.
2. OTHER RESTRICTIONS. You may not reverse engineer, decompile, or disassemble the Program.
3. APPLICABLE LAW. This License Agreement shall be interpreted and governed under the laws and in the state and federal courts
of New Hampshire. You accept the personal jurisdiction and venue of the New Hampshire courts.

Notice
HSIM-W6 User’s Guide iii
Exclusion of Warranty and Disclaimer of Liability
1. EXCLUSION OF WARRANTY. Except as may be specifically provided by Cabletron in writing, Cabletron makes no warranty,
expressed or implied, concerning the Program (including its documentation and media).
CABLETRON DISCLAIMS ALL WARRANTIES, OTHER THAN THOSE SUPPLIED TOYOU BY CABLETRON IN
WRITING, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, WITH RESPECT TO THE PROGRAM, THE
ACCOMPANYING WRITTEN MATERIALS, AND ANY ACCOMPANYING HARDWARE.
2. NO LIABILITY FOR CONSEQUENTIAL DAMAGES. IN NO EVENT SHALL CABLETRON OR ITS SUPPLIERS BE
LIABLE FOR ANY DAMAGES WHATSOEVER (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF
BUSINESS, PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, SPECIAL, INCIDENTAL,
CONSEQUENTIAL, OR RELIANCE DAMAGES, OR OTHER LOSS) ARISING OUT OF THE USE OR INABILITY TO USE
THIS CABLETRON PRODUCT, EVEN IF CABLETRON HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
DAMAGES. BECAUSE SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR
CONSEQUENTIAL OR INCIDENTAL DAMAGES, OR ON THE DURATION OR LIMITATION OF IMPLIED
WARRANTIES, IN SOME INSTANCES THE ABOVE LIMITATIONS AND EXCLUSIONS MAY NOT APPLY TO YOU.
United States Government Restricted Rights
The enclosed product (a) was developed solely at private expense; (b) contains “restricted computer software” submitted with restricted
rights in accordance with Section 52227-19 (a) through (d) of the Commercial Computer Software - Restricted Rights Clause and its
successors, and (c) in all respects is proprietary data belonging to Cabletron and/or its suppliers.
For Department of Defense units, the product is licensed with “Restricted Rights” as defined in the DoD Supplement to the Federal
Acquisition Regulations, Section 52.227-7013 (c) (1) (ii) and its successors, and use, duplication, disclosure by the Government is
subject to restrictions as set forth in subparagraph (c) (1) (ii) of the Rights in Technical Data and Computer Software clause at
252.227-7013. Cabletron Systems, Inc., 35 Industrial Way, Rochester, New Hampshire 03867-0505.

Notice
iv HSIM-W6 User’s Guide
DECLARATION OF CONFORMITY
Application of Council Directive(s): 89/336/EEC
73/23/EEC
91/263/EEC
Manufacturer’s Name: Cabletron Systems, Inc.
Manufacturer’s Address: 35 Industrial Way
PO Box 5005
Rochester, NH 03867
European Representative Name: Mr. J. Solari
European Representative Address: Cabletron Systems Limited
Nexus House, Newbury Business Park
London Road, Newbury
Berkshire RG13 2PZ, England
Conformance to Directive(s)/Product Standards: EC Directive 89/336/EEC
EC Directive 73/23/EEC
EC Directive 91/263/EEC
EN 55022
EN 50082-1
EN 60950
Equipment Type/Environment: Networking Equipment, for use in a Commercial or Light Industrial
Environment.
We the undersigned, hereby declare, under our sole responsibility, that the equipment packaged with this notice conforms to the
above directives.
Manufacturer Legal Representative in Europe
Mr. Ronald Fotino Mr. J. Solari
___________________________________ ___________________________________
Full Name Full Name
Principal Compliance Engineer Managing Director - E.M.E.A.
___________________________________ ___________________________________
Title Title
Rochester, NH, USA Newbury, Berkshire, England
___________________________________ ___________________________________
Location Location

HSIM-W6 User’s Guide v
Contents
CHAPTER 1 INTRODUCTION
Structure of this Guide ....................................................................................1
Related Documents ........................................................................................2
Document Conventions...................................................................................3
Getting Help....................................................................................................4
CHAPTER 2 ABOUT THE HSIM-W6
HSIM-W6 Hardware........................................................................................5
WAN Connection......................................................................................5
Additional Features...................................................................................7
Remote Management Capabilities..................................................................7
Optional Feature .............................................................................................8
HSIM-W6 Firmware Support...........................................................................8
WAN Protocols.........................................................................................8
Inverse Multiplexing................................................................................10
Firmware Data Compression..................................................................10
HDLC......................................................................................................11
DHCP and NAT......................................................................................11
Point-to-Point Protocol............................................................................12
PAP and CHAP Security ........................................................................12
LQM........................................................................................................13
Multilink Protocol ....................................................................................13
ISDN.......................................................................................................14
ISDN Back-up.........................................................................................15
HDSL......................................................................................................16
Bridging and Routing..............................................................................16
Bridging and Routing Protocol Filtering..................................................18
System Passwords.................................................................................18
Simple Network Management Protocol (SNMP) ....................................19
Software and Firmware Upgrades..........................................................22

Contents
vi HSIM-W6 User’s Guide
CHAPTER 3 ISDN LINE ORDERING AND CONFIGURATION
Arranging ISDN Service................................................................................23
Telephone Switch Support............................................................................24
ISDN BRI Line Configuration ........................................................................24
ISDN BRI Configurations........................................................................25
SPIDs, Directory Numbers and Telephone Numbers.............................25
Telephone Switch Parameters......................................................................26
CHAPTER 4 PLANNING FOR HSIM-W6 ISDN CONFIGURATION
Configuration Process and Terminology.......................................................29
Collect Network Information ...................................................................30
Names and Passwords...........................................................................30
ISDN Line Information ............................................................................31
Network Information Diagrams...............................................................32
Network Information Tables....................................................................38
Sample Configuration....................................................................................42
Names and Passwords Example..................................................................48
CHAPTER 5 INSTALLATION
Unpacking the HSIM-W6...............................................................................49
Guidelines for Installations............................................................................49
Installing Interface Modules ..........................................................................50
Installing WAN Port Interface Modules (WPIMs) ..........................................50
CSX-COMP/ENCR Installation .....................................................................52
Installing an HSIM.........................................................................................54
Installing an HSIM in an Interface Module..............................................54
Installing an HSIM in a SmartSWITCH Chassis.....................................56

Contents
HSIM-W6 User’s Guide vii
CHAPTER 6 HSIM-W6 CONFIGURATION WITH QUICKSET
HSIM Configuration.......................................................................................61
HSIM Configuration Window ..................................................................62
Wide Area 1 and 2 Configuration..................................................................66
Wide Area T1 Configuration Window .....................................................67
Wide Area E1 Configuration Window .....................................................70
Wide Area DI Configuration Window......................................................72
Wide Area Synchronous Configuration Window.....................................75
Wide Area DDS Configuration Window..................................................78
Wide Area HDSL Configuration Window................................................80
Wide Area Frame Relay Time Slot Configuration Window.....................82
Wide Area PPP Time Slot Configuration Window ..................................84
Wide Area HDSL Time Slot Configuration Window................................86
Bridging and Routing Configuration..............................................................88
Bridging and Routing Configuration Window..........................................88
Bridging and Routing (WAN Frame Type) Configuration Window..........94
Routing Configuration Window...............................................................96
IP Routing Configuration ........................................................................97
IPX Routing Configuration......................................................................97
Advanced Routing Configuration Window............................................100
QuickSET Pull-Down Menus ................................................................106
Advanced Configuration Menu .............................................................111
Compression & Congestion Window....................................................112
CHAPTER 7 GENERAL CONFIGURATION USING LOCAL MANAGEMENT
Chapter Organization..................................................................................115
Local Management Overview......................................................................116
Management Agent ..............................................................................116
Local vs. Remote Management............................................................116
Local Management Screen Elements...................................................117
Local Management Keyboard Conventions..........................................119
Navigating Within Local Management Screens....................................120
Local Management Screen Hierarchy ..................................................121

Contents
viii HSIM-W6 User’s Guide
Accessing Local Management....................................................................121
Establishing a TELNET Connection .....................................................121
Using the Menu Screens ......................................................................122
Main Menu Screen......................................................................................123
Setup Menu Screen ....................................................................................124
System Level Screen..................................................................................126
Setting the System Date.......................................................................128
Setting the System Time ......................................................................128
Setting the Host IP Address .................................................................129
Setting the Subnet Mask ......................................................................129
Setting the Default Gateway.................................................................130
Setting the Default Interface.................................................................130
SNMP Community Names Screen..............................................................131
Community Name Access Policy..........................................................132
Setting SNMP Community Names .......................................................132
SNMP Traps Screen...................................................................................133
Trap Table Screen Fields .....................................................................133
Setting the SNMP Trap Destination......................................................134
Flash Download Screen..............................................................................135
Selecting a Flash Download Method....................................................136
Bridge Setup Screen...................................................................................139
Bridge Setup Screen Fields..................................................................139
Selecting a Spanning Tree Protocol.....................................................140
Selecting the Bridge Port Administrative Status...................................140
Selecting the Bridge Port Pair Administrative Status............................141
Router Setup Screen...................................................................................142
Router Setup Screen Fields .................................................................142
IP Configuration Screen..............................................................................143
IP Configuration Screen Fields.............................................................143
IP General Config Screen.....................................................................144
IP General Configuration Status Fields ................................................144
IP General Configuration Fields ...........................................................145
Enabling the RIP on a Port...................................................................151

Contents
HSIM-W6 User’s Guide ix
IPX Configuration Screen............................................................................153
IPX Configuration Fields.......................................................................153
IPX General Configuration Screen .......................................................155
IPX General Configuration Status Fields..............................................155
IPX General Configuration Fields.........................................................156
IPX Routing over Frame Relay.............................................................159
Enabling the IPX SAP Protocol on a Port.............................................160
Enabling the RIP on a Port...................................................................162
WAN Setup .................................................................................................164
WAN Physical Configuration Screen Fields .........................................165
WAN Interface Configuration Screen..........................................................166
WAN Interface Configuration Screen Fields.........................................166
CHAPTER 8 MIB NAVIGATOR
Chapter Organization..................................................................................169
MIB Navigator Screen.................................................................................170
Managing Device MIBs.........................................................................170
MIB Navigator Command Set Overview .....................................................171
Conventions for MIB Navigator Commands .........................................172
Navigation Commands................................................................................173
Other Commands........................................................................................182
Special Commands.....................................................................................196

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x HSIM-W6 User’s Guide
CHAPTER 9 TROUBLESHOOTING
Troubleshooting HSIM-W6 Hardware.........................................................201
Power (PWR) LED is OFF....................................................................201
Processor (CPU) LED is OFF...............................................................201
Processor (CPU) LED is RED ..............................................................202
ASYNC Console Connection ......................................................................202
Link (LNK) LED is OFF.........................................................................202
Link (LNK) LED is RED or GREEN ......................................................202
Link (LNK) LED is AMBER ...................................................................202
Status (STS) LED is OFF .....................................................................202
Status (STS) LED is AMBER................................................................202
Status (STS) LED is GREEN or GREEN (Blinking)..............................202
Status (STS) LED is AMBER (Blinking)................................................203
Troubleshooting the WAN...........................................................................203
Link (LNK) LED is OFF.........................................................................203
Link (LNK) LED is RED ........................................................................203
Link (LNK) LED is AMBER ...................................................................203
Status (STS) LED is OFF .....................................................................204
Status (STS) LED is RED.....................................................................205
Status (STS) LED is AMBER................................................................205
Status (STS) LED is AMBER (blinking)................................................206
Status (STS) LED is GREEN................................................................206
Investigating Software Configuration Problems..........................................207
Connection to Device Fails During Software Configuration..................207
User Cannot Communicate with Remote Network Station...................207

Contents
HSIM-W6 User’s Guide xi
APPENDIX A WPIM CABLE SPECIFICATIONS
WPIM-T1.....................................................................................................209
WPIM-SY ....................................................................................................211
EIA-449.................................................................................................212
V.35 ......................................................................................................213
EIA-232.................................................................................................215
X.21 ......................................................................................................216
EIA-530, EIA-530 ALT A, EIA-530 A, and EIA-530 A ALT A................217
WPIM-DDS..................................................................................................219
WPIM-E1.....................................................................................................220
WPIM-DI......................................................................................................222
WPIM-HDSL................................................................................................223
WPIM-S/T....................................................................................................224
APPENDIX B SPECIFICATIONS AND STANDARDS COMPLIANCE
Regulatory Compliance...............................................................................225
Individual WPIM Regulatory Compliance....................................................226
WPIM-TI ...............................................................................................226
WPIM-SY..............................................................................................226
WPIM-DDS...........................................................................................227
WPIM-E1 ..............................................................................................227
WPIM-DI...............................................................................................227
WPIM-S/T.............................................................................................228
WPIM-HDSL.........................................................................................228
APPENDIX C NETWORK INFORMATION WORKSHEETS
APPENDIX D FCC PART 68 - USER’S INFORMATION FOR HSIM-W6
APPENDIX E GLOSSARY
INDEX

Contents
xii HSIM-W6 User’s Guide

HSIM-W6 User’s Guide 1
1 Introduction
Welcome to the Cabletron Systems HSIM-W6 User’s Guide . This guide provides basic
configuration information, hardware specifications and troubleshooting tips for the HSIM-W6.
This document also provides guidelines for routing and bridging over Wide Area Networks
(WANs).
Structure of this Guide
This guide is organized as follows:
Chapter 1 , Introduction , details document conventions and provides information on getting help.
Chapter 2 , About the HSIM-W6 , describes the hardware components and software protocols
and features.
Chapter 3 , ISDN Line Ordering and Configuration provides the information you need to order
ISDN service from the telephone company.
Chapter 4 , Planning for CSX400 ISDN Configuration describes the router configuration
process.
Chapter 5 , Installation , provides detailed installation instructions.
Chapter 6 , HSIM-W6 Configuration with QuickSET , provides instructions on connecting the
HSIM-W6 to a Wide Area Network (WAN) using Cabletron Systems
QuickSET management
utility.
Chapter 7 , General Configuration Using Local Management , provides instructions for
configuring the HSIM-W6 through a TELNET connection.
Chapter 8 , MIB Navigator , explains how to use the MIB Navigator utility.
Chapter 9 , Troubleshooting , provides detailed troubleshooting tips using the LANVIEW LEDs
on the HSIM-W6.
Appendix A , WPIM Cable Specifications , provides part number and connector information for
WPIMs.
Appendix B , Specifications and Standards Compliance , provides hardware specifications and
safety and compliance information.

Chapter 1: Introduction
2 HSIM-W6 User’s Guide
Appendix C , Network Information Worksheets , provides blank network information
worksheets.
Appendix D , FCC Part 68 - User’s Information For HSIM-W6 , provides instructions required
to comply with FCC Rules, Part 68.
Appendix E , Glossary , defines commonly used terms.
Related Documents
Use the Cabletron Systems QuickSTART Guide located in the QuickSET CD case to install the
HSIM-W6.
Use the READ ME FIRST! document included with the HSIM-W6 to set up your computer
before beginning configuration.
Use the appropriate Cabletron Systems WPIM Local Management Guide to connect your
HSIM-W6 to a WAN using a TELNET connection.

Chapter 1: Introduction
HSIM-W6 User’s Guide 3
Document Conventions
The following conventions are used throughout this guide:
NOTE
Note symbol. Calls the reader’s attention to any item of information that may be of
special importance.
TIP
Tip symbol. Conveys helpful hints concerning procedures or actions.
!
CAUTION
Caution symbol. Contains information essential to avoid damage to the equipment.
Electrical Hazard Warning symbol.Warns against an action that could result in
personal injury or death due to an electrical hazard.
WARNING
Warning symbol.Warns against an action that could result in personal injury or death.

Chapter 1: Introduction
4 HSIM-W6 User’s Guide
Getting Help
If you need additional support related to this device, or if you have any questions, comments, or
suggestions concerning this manual, contact the Cabletron Systems Global Call Center:
Before calling the Cabletron Systems Global Call Center, have the following information ready:
• A description of the failure
•A description of any action(s) already taken to resolve the problem (e.g., changing mode
switches, rebooting the unit, etc.)
•A description of your network environment (layout, cable type, etc.)
•Network load and frame size at the time of trouble (if known)
•The serial and revision numbers of all Cabletron Systems products in the network
•The device history (i.e., have you returned the device before, is this a recurring problem, etc.)
•Any previous Return Material Authorization (RMA) numbers
Phone [phone]
Internet mail suppor[email protected]
FTP ctron.com (134.141.197.25)
Login anonymous
Password your email address
BBS [phone]
Modem setting 8N1: 8 data bits, No parity, 1 stop bit
For additional information about Cabletron Systems or our products,
visit our World Wide Web site: http://www.cabletron.com/
For technical support, select Service and Support.

HSIM-W6 User’s Guide 5
2 About the HSIM-W6
The HSIM-W6 (Figure 1) offers high-speed WideArea Network (WAN) access to remote sites via
two WAN Port Interface Modules (WPIMs) to the device into which it is installed. The HSIM-W6
supports IEEE 802.1d transparent bridging, IP routing, IPX routing between the host device and
the two WAN connections, ISDN, Dynamic Host Configuration Protocol (DHCP), Network
Address Translation (NAT), and Inverse Multiplexing (IMUX) between Ethernet LANs across a
WAN resource. In addition, the ASYNC port connector can be used as a local console connection.
Figure 1 The HSIM-W6
HSIM-W6 Hardware
This section details the HSIM-W6 hardware capabilities.
WAN Connection
The HSIM-W6 supports Point-to-Point Protocol (PPP) including: Link Control Protocol (LCP),
BNCP, IPCP, IPXCP, LQM, Multilink Protocol (MP) and CHAP and PAP, ISDN-BRI and Frame
Relay protocols through one of the following WAN port interface modules (WPIMs):
•The WPIM-T1 provides a T1 interface through a front panel RJ45 port and includes a built-in
Channel Service Unit/Digital Service Unit (CSU/DSU) for direct connection to a T1 line. The
WPIM-T1 provides both Full T1 or Fractional T1 using 56 or 64 Kbps timeslots, with a total
throughput of up to 1.544 Mbps.
WIDE AREA1 WIDE AREA2 HSIM-W6
225700
TELCO
TELCO
CPU
LNK
STS
LNK
STS
LNK
STS
ASYNC

Chapter 2: About the HSIM-W6
6 HSIM-W6 User’s Guide
•The WPIM-SY provides a synchronous serial connection of up to 2.048 Mbps to external
communications equipment (e.g., a multiplexer or CSU/DSU). The WPIM-Sync uses a
subminiature 26-pin connector that supports the following electrical signal interfaces (see the
Synchronous WAN Configuration Window section in Chapter 4 for specific cable part
numbers):
•EIA-RS449
•V.35
•EIA-RS232D
•X.21
•EIA-RS530
•EIA-530A
•RS530 ALT A
•RS530A ALT A
•The WPIM-DDS provides a 56 Kbps or 64 Kbps Digital Data Service (DDS) connection. The
WPIM-DDS supports remote CSU diagnostic or 64 Kbps clear channel loopback and
non-latching remote DSU diagnostic loopback.
•The WPIM-E1 provides an E1 interface through a front panel RJ45 port and includes a built-in
CSU/DSU for direct connection to an E1 line. The WPIM-E1 provides both Full E1 or
Fractional E1 using 56 or 64 Kbps timeslots with a total throughput of up to 2 Mbps.
•The WPIM-DI provides a T1 interface through a front panel RJ45 port and includes a built-in
CSU/DSU for direct connection to a T1 line.TheWPIM-DI provides both FullT1 or Fractional
T1 using 56 or 64 Kbps timeslots and also provides a second Drop-and-Insert interface, which
allows more than one device to share a single T1 connection.
•The WPIM-S/T provides an Integrated Services Digital Network (ISDN) 128 Kbps Basic Rate
Interface (BRI) for the HSIM-W6.The WPIM-S/T provides an ISDN back-up link for a remote
site or branch office when the main WPIM for a frame relay or leased line loses a connection
or becomes disabled. An NT-1 adapter is necessary for this interface in the United States.
•The WPIM-HDSL provides a connection for users in a campus environment, or have access to
local subscriber loops, who want to send their data over their existing telephone lines, that may
run between floors, buildings, or other physical structures, at rates of up to 1.544 Mbps. HDSL
supports line lengths of up to 3, 657 meters (12,000 feet) over 24AWG (American Wire Gauge)
Unshielded Twisted Pair (UTP) cabling.