ZyXEL Communications Prestige 724 User manual

Prestige 724
G.SHDSL CSU/DSU
User's Guide
Version 3.40
August 2001

Prestige 724 G.SHDSL CSU/DSU
ii Copyright
Copyright
Copyright © 2001 by ZyXEL Communications Corporation.
The contents of this publication may not be reproduced in any part or as a whole, transcribed, stored in a
retrieval system, translated into any language, or transmitted in any form or by any means, electronic,
mechanical, magnetic, optical, chemical, photocopying, manual, or otherwise, without the prior written
permission of ZyXEL Communications Corporation.
Published by ZyXEL Communications Corporation. All rights reserved.
Disclaimer
ZyXEL does not assume any liability arising out of the application or use of any products, or software
described herein. Neither does it convey any license under its patent rights nor the patent rights of others.
ZyXEL further reserves the right to make changes in any products described herein without notice. This
publication is subject to change without notice.
Trademarks
ZyNOS (ZyXEL Network Operating System) is a registered trademark of ZyXEL Communications, Inc.
Other trademarks mentioned in this publication are used for identification purposes only and may be
properties of their respective owners.

Prestige 724 G.SHDSL CSU/DSU
Information for Canadian Users iii
Information for Canadian Users
The Industry Canada label identifies certified equipment. This certification means that the equipment meets
certain telecommunications network protective operation and safety requirements. The Industry Canada
label does not guarantee that the equipment will operate to a user's satisfaction.
Before installing this equipment, users should ensure that it is permissible to be connected to the facilities of
the local telecommunications company. The equipment must also be installed using an acceptable method
of connection. In some cases, the company's inside wiring associated with a single line individual service
may be extended by means of a certified connector assembly. The customer should be aware that
compliance with the above conditions may not prevent degradation of service in some situations.
Repairs to certified equipment should be made by an authorized Canadian maintenance facility designated
by the supplier. Any repairs or alterations made by the user to this equipment, or equipment malfunctions,
may give the telecommunications company cause to request the user to disconnect the equipment.
For their own protection, users should ensure that the electrical ground connections of the power utility,
telephone lines, and internal metallic water pipe system, if present, are connected together. This precaution
may be particularly important in rural areas.
Caution
Users should not attempt to make such connections themselves, but should contact the appropriate electrical
inspection authority, or electrician, as appropriate.
Note
This digital apparatus does not exceed the Class A limits for radio noise emissions from digital apparatus
set out in the radio interference regulations of Industry Canada.

Prestige 724 G.SHDSL CSU/DSU
iv FCC
Federal Communications Commission
(FCC) Interference Statement
This device complies with Part 15 of FCC rules. Operation is subject to the following two conditions:
•This device may not cause harmful interference.
•This device must accept any interference received, including interference that may cause undesired
operations.
This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to
Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference in a commercial environment. This equipment generates, uses, and can radiate radio frequency
energy, and if not installed and used in accordance with the instructions, may cause harmful interference to
radio communications.
If this equipment does cause harmful interference to radio/television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of
the following measures:
1. Reorient or relocate the receiving antenna.
2. Increase the separation between the equipment and the receiver.
3. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
4. Consult the dealer or an experienced radio/TV technician for help.
Notice 1
Changes or modifications not expressly approved by the party responsible for compliance could void the
user's authority to operate the equipment.
Notice 2
Shielded RS-232 cables are required to be used to ensure compliance with FCC Part 15, and it is the
responsibility of the user to provide and use shielded RS-232 cables.

Prestige 724 G.SHDSL CSU/DSU
CE v
Declaration of Conformity
We, the Manufacturer/Importer
ZyXEL Communications Services GmbH.
Thaliastrasse 125a/2/2/4
A-1160 Vienna – AUSTRIA
declare that the product
Prestige 724
is in conformity with
(Reference to the specification under which conformity is declared)
Standard Standard Item Version
EN 55022 Radio disturbance characteristics – Limits and method of measurement. 1994
EN 61000-3-2 Disturbance in supply system caused by household appliances and
similar electrical equipment “Harmonics”.
1995
EN 61000-3-3 Disturbance in supply system caused by household appliances and
similar electrical equipment “Voltage fluctuations”.
1995
EN 61000-4-2 Electrostatic discharge immunity test – Basic EMC Publication. 1995
EN 61000-4-3 Radiated, radio-frequency, electromagnetic field immunity test. 1996
EN 61000-4-4 Electrical fast transient/burst immunity test – Basic EMC Publication. 1995
EN 61000-4-5 Surge immunity test. 1995
EN 61000-4-6 Immunity to conducted disturbances, induced by radio-frequency fields. 1996
EN 61000-4-8 Power Magnetic Measurement. 1993
EN 61000-4-11 Voltage dips, short interruptions and voltage variations immunity tests. 1994
Note
and Certifications
For more information about certifications, refer to www.zyxel.com.

Prestige 724 G.SHDSL CSU/DSU
vi ZyXEL Limited Warranty
ZyXEL Limited Warranty
ZyXEL warrants to the original end user (purchaser) that this product is free from any defects in materials
or workmanship for a period of up to two (2) years from the date of purchase. During the warranty period
and upon proof of purchase, should the product have indications of failure due to faulty workmanship
and/or materials, ZyXEL will, at its discretion, repair or replace the defective products or components
without charge for either parts or labor and to whatever extent it shall deem necessary to restore the product
or components to proper operating condition. Any replacement will consist of a new or re-manufactured
functionally equivalent product of equal value, and will be solely at the discretion of ZyXEL. This warranty
shall not apply if the product is modified, misused, tampered with, damaged by an act of God, or subjected
to abnormal working conditions.
Note
Repair or replacement, as provided under this warranty, is the exclusive remedy of the purchaser. This
warranty is in lieu of all other warranties, express or implied, including any implied warranty of
merchantability or fitness for a particular use or purpose. ZyXEL shall in no event be held liable for indirect
or consequential damages of any kind of character to the purchaser.
To obtain the services of this warranty, contact ZyXEL's Service Center for your Return Material
Authorization number (RMA). Products must be returned Postage Prepaid. It is recommended that the unit
be insured when shipped. Any returned products without proof of purchase or those with an out-dated
warranty will be repaired or replaced (at the discretion of ZyXEL) and the customer will be billed for parts
and labor. All repaired or replaced products will be shipped by ZyXEL to the corresponding return address,
Postage Paid. This warranty gives you specific legal rights, and you may also have other rights that vary
from country to country.
Online Registration
Do not forget to register your Prestige (fast, easy online registration at www.zyxel.com) for free future
product updates and information.

Prestige 724 G.SHDSL CSU/DSU
Customer Support vii
Customer Support
Please have the following information ready when you contact customer support.
•Product model and serial number.
•Information in Menu 24.2.1 –System Information.
•Warranty Information.
•Date that you received your device.
•Brief description of the problem and the steps you took to solve it.
METHOD
LOCATION
E-MAIL
SUPPORT/SALES
TELEPHONE/FAX WEB SITE/ FTP SITE REGULAR MAIL
[e-mail]
[e-mail]
[phone] www.zyxel.com
www.europe.zyxel.com
WORLDWIDE
[e-mail] [phone] ftp.europe.zyxel.com
ZyXEL Communications Corp.,
6 Innovation Road II, Science-
Based Industrial Park,
HsinChu, Taiwan 300, R.O.C.
[e-mail] [phone]
800-255-4101
www.zyxel.com
NORTH
AMERICA
[e-mail] [phone] ftp.zyxel.com
ZyXEL Communications Inc.,
1650 Miraloma Avenue,
Placentia, CA 92870, U.S.A.
[e-mail] [phone] www.zyxel.dk
SCANDINAVIA
[e-mail] [phone] ftp.zyxel.dk
ZyXEL Communications A/S,
Columbusvej 5, 2860 Soeborg,
Denmark.
[e-mail] [phone] www.zyxel.at
AUSTRIA
[e-mail] [phone] ftp.zyxel.at
ZyXEL Communications
Services GmbH. Thaliastrasse
125a/2/2/4 A-1160 Vienna,
Austria
[e-mail] [phone] www.zyxel.de
GERMANY
[e-mail] [phone]
ZyXEL Deutschland GmbH.
Adenauerstr. 20/A4 D-52146
Wuerselen, Germany
[e-mail] [phone] www.zyxel.com.my
MALAYSIA
[e-mail] [phone]
Lot B2-06, PJ Industrial Park,
Section 13, Jalan Kemajuan,
46200 Petaling Jaya Selangor
Darul Ehasn, Malaysia

Prestige 724 G.SHDSL CSU/DSU
viii Table of Contents
Table of Contents
Copyright ....................................................................................................................................................ii
Information for Canadian Users.................................................................................................................iii
Federal Communications Commission (FCC) Interference Statement...................................................... iv
ZyXEL Limited Warranty.......................................................................................................................... vi
Customer Support .....................................................................................................................................vii
List of Figures............................................................................................................................................ xi
List of Tables ...........................................................................................................................................xiii
Preface ..................................................................................................................................................... xiv
CSU/DSU and DSL Basics...................................................................................................................... xvi
Chapter 1 Getting to Know Your G.SHDSL CSU/DSU..........................................................................1-1
1.1 Features of the Prestige ................................................................................................................1-1
1.2 Application Scenarios for the Prestige.........................................................................................1-2
1.2.1 Internet Access Application..................................................................................................1-2
1.2.2 LAN-to-LAN Application ....................................................................................................1-3
Chapter 2 Hardware Installation and Initial Setup ................................................................................2-1
2.1 Installation Requirements ............................................................................................................2-1
2.2 Front Panel LEDs of the Prestige 724..........................................................................................2-1
2.3 Rear Panel and Connections of the Prestige 724..........................................................................2-2
2.4 Turning On Your Prestige ............................................................................................................2-3
2.5 Navigating the SMT Interface......................................................................................................2-4
2.6 SMT Menu Commands................................................................................................................2-6
2.6.1 System Management Terminal Interface Summary..............................................................2-7
2.7 Changing the System Password ...................................................................................................2-7
2.8 Resetting the Prestige...................................................................................................................2-8
2.9 General Setup...............................................................................................................................2-9
2.10 Setting Up the WAN Link..........................................................................................................2-10
2.10.1 Service Type .......................................................................................................................2-10
2.10.2 Rate Adaption .....................................................................................................................2-10
2.10.3 Transfer Rates.....................................................................................................................2-10
2.10.4 Standard Mode....................................................................................................................2-10
2.11 Data Port Setup ..........................................................................................................................2-12
2.11.1 Line Type............................................................................................................................2-12
2.11.2 Link Management ...............................................................................................................2-12
2.11.3 Clock Source.......................................................................................................................2-12
Chapter 3 Channel Setup ..........................................................................................................................3-1
3.1 Introduction..................................................................................................................................3-1
3.1.1 Configuration Requirements.................................................................................................3-1
3.1.2 Networks...............................................................................................................................3-2

Prestige 724 G.SHDSL CSU/DSU
Table of Contents ix
3.2 Channel Setup ..............................................................................................................................3-2
3.3 Channel Profile.............................................................................................................................3-3
3.3.1 Channel Name.......................................................................................................................3-3
3.3.2 Active....................................................................................................................................3-3
3.3.3 Encapsulation........................................................................................................................3-3
3.3.4 VPI, VCI and DLCI ..............................................................................................................3-5
3.3.5 Configure a Channel Profile..................................................................................................3-5
3.4 Remote Management....................................................................................................................3-6
Chapter 4 System Information & Diagnosis ........................................................................................... 4-1
4.1 System Status ...............................................................................................................................4-1
4.2 System Information and Console Port Speed...............................................................................4-3
4.2.1 System Information...............................................................................................................4-3
4.2.2 Console Port Speed ...............................................................................................................4-4
4.3 Log and Trace...............................................................................................................................4-4
4.3.1 Viewing Error Log ................................................................................................................4-4
4.4 Diagnostic ....................................................................................................................................4-5
4.5 Command Interpreter Mode .........................................................................................................4-6
Chapter 5 Firmware and Configuration File Maintenance................................................................... 5-1
5.1 Filename Conventions..................................................................................................................5-1
5.2 Backup Configuration ..................................................................................................................5-2
5.2.1 Backup Configuration ...........................................................................................................5-2
5.2.2 Using the FTP Command from the DOS Prompt..................................................................5-3
5.2.3 Example of FTP Commands from the DOS Prompt.............................................................5-4
5.2.4 Third Party FTP Clients ........................................................................................................5-4
5.2.5 TFTP and FTP over WAN Will Not Work When.................................................................5-4
5.2.6 Backup Configuration Using TFTP ......................................................................................5-5
5.2.7 TFTP Command Example.....................................................................................................5-5
5.2.8 Third Party TFTP Clients......................................................................................................5-5
5.2.9 Backup Via Console Port......................................................................................................5-6
5.3 Restore Configuration ..................................................................................................................5-7
5.3.1 Restore Using FTP or TFTP .................................................................................................5-8
5.3.2 Restore Using FTP or TFTP Session Example .....................................................................5-9
5.3.3 Restore Via Console Port......................................................................................................5-9
5.4 Uploading Firmware and Configuration Files............................................................................5-10
5.4.1 Firmware File Upload .........................................................................................................5-10
5.4.2 Configuration File Upload ..................................................................................................5-11
5.4.3 FTP Session Example of Firmware File Upload.................................................................5-12
5.4.4 TFTP File Upload ...............................................................................................................5-12
5.4.5 TFTP Upload Command Example......................................................................................5-13
5.4.6 Uploading Via Console Port ...............................................................................................5-13
5.4.7 Uploading a Firmware File Via Console Port .....................................................................5-14
5.4.8 Example Xmodem Firmware Upload Using HyperTerminal..............................................5-14

Prestige 724 G.SHDSL CSU/DSU
xTable of Contents
5.4.9 Uploading a Configuration File Via Console Port..............................................................5-15
5.4.10 Example Xmodem Configuration Upload Using HyperTerminal.......................................5-15
Chapter 6 Troubleshooting........................................................................................................................6-1
Appendix A Power Adapter Specifications ............................................................................................... A
Appendix B TCP/IP.................................................................................................................................. B
Appendix C Virtual Circuit Topology.........................................................................................................F
Glossary..................................................................................................................................................... G
Index ....................................................................................................................................................... Q

Prestige 724 G.SHDSL CSU/DSU
List of Figures xi
List of Figures
Figure 1-1 Internet Access Application........................................................................................................1-3
Figure 1-2 LAN-to-LAN Application ..........................................................................................................1-3
Figure 2-1 Front Panel of Prestige 724.........................................................................................................2-1
Figure 2-2 Rear Panel Connections of the Prestige 724...............................................................................2-2
Figure 2-3 Power-On Display ......................................................................................................................2-3
Figure 2-4 Login Screen...............................................................................................................................2-4
Figure 2-5 Prestige 724 SMT Menu Overview ............................................................................................2-5
Figure 2-6 SMT Main Menu ........................................................................................................................2-7
Figure 2-7 Menu 23 — System Password....................................................................................................2-8
Figure 2-8 Starting the Prestige ...................................................................................................................2-8
Figure 2-9 Menu 1 — General Setup ...........................................................................................................2-9
Figure 2-10 Menu 2 — WAN Setup........................................................................................................... 2-11
Figure 2-11 Menu 3 — Data Port Setup.....................................................................................................2-13
Figure 3-1 Prestige Conversion of Frame Relay/HDLC to ATM and Vice-Versa........................................3-1
Figure 3-2 Menu 11 — Channel Setup.........................................................................................................3-2
Figure 3-3 Headers Stripped By Some Encapsulation Types .......................................................................3-4
Figure 3-4 Menu 11.1 — Channel Profile ....................................................................................................3-5
Figure 3-5 Menu 11 — Channel Setup (Remote Management) ...................................................................3-8
Figure 4-1 Menu 24 — System Maintenance...............................................................................................4-1
Figure 4-2 Menu 24.1 — System Maintenance — Status ............................................................................4-2
Figure 4-3 Menu 24.2 — System Information and Console Port Speed ......................................................4-3
Figure 4-4 System Maintenance — Information.........................................................................................4-3
Figure 4-5 Menu 24.2.2 — System Maintenance — Change Console Port Speed .....................................4-4
Figure 4-6 Menu 24.3 — System Maintenance — Log and Trace...............................................................4-5
Figure 4-7 Sample Error and Information Messages....................................................................................4-5
Figure 4-8 Menu 24.4 — System Maintenance — Diagnostic.....................................................................4-6
Figure 4-9 Command Interpreter Mode in Menu 24 ....................................................................................4-7
Figure 4-10 Valid Commands.......................................................................................................................4-7
Figure 5-1 Telnet in Menu 24.5....................................................................................................................5-3
Figure 5-2 FTP Session Example.................................................................................................................5-4
Figure 5-3 System Maintenance — Backup Configuration..........................................................................5-6
Figure 5-4 System Maintenance — Starting Xmodem Download Screen ...................................................5-6
Figure 5-5 Backup Configuration Example..................................................................................................5-7
Figure 5-6 Successful Backup Confirmation Screen....................................................................................5-7
Figure 5-7 Telnet into Menu 24.6.................................................................................................................5-8
Figure 5-8 Restore Using FTP or TFTP Session Example...........................................................................5-9
Figure 5-9 System Maintenance — Restore Configuration..........................................................................5-9
Figure 5-10 System Maintenance — Starting Xmodem Download Screen .................................................5-9
Figure 5-11 Restore Configuration Example..............................................................................................5-10

Prestige 724 G.SHDSL CSU/DSU
xii List of Figures
Figure 5-12 Successful Restoration Confirmation Screen ......................................................................... 5-10
Figure 5-13 Telnet Into Menu 24.7.1 — Upload System Firmware........................................................... 5-11
Figure 5-14 Telnet Into Menu 24.7.2 — System Maintenance .................................................................. 5-11
Figure 5-15 FTP Session Example of Firmware File Upload .................................................................... 5-12
Figure 5-16 Menu 24.7.1 as seen using the Console Port ..........................................................................5-14
Figure 5-17 Example Xmodem Upload ..................................................................................................... 5-14
Figure 5-18 Menu 24.7.2 as seen using the Console Port ..........................................................................5-15
Figure 5-19 Example Xmodem Upload ..................................................................................................... 5-16

Prestige 724 G.SHDSL CSU/DSU
List of Tables xiii
List of Tables
Table 2-1 LED Functions .............................................................................................................................2-1
Table 2-2 Main Menu Commands................................................................................................................2-6
Table 2-3 Main Menu Summary...................................................................................................................2-7
Table 2-4 General Setup Menu Fields ..........................................................................................................2-9
Table 2-5 Menu 2 — WAN Setup Description........................................................................................... 2-11
Table 2-6 Menu 3 — Data Port Setup Description.....................................................................................2-13
Table 3-1 Summation of Encapsulation Types .............................................................................................3-4
Table 3-2 Valid Ranges for VPI, VCI and DLCI..........................................................................................3-5
Table 3-3 Channel Profile Menu Fields........................................................................................................3-5
Table 3-4 Menu 11.1 — Description of Fields Used To Configure Remote Management...........................3-7
Table 4-1 System Maintenance — Status Menu Fields................................................................................4-2
Table 4-2 Fields in System Maintenance......................................................................................................4-4
Table 4-3 System Maintenance Menu — Diagnostic ...................................................................................4-6
Table 5-1 Filename Conventions..................................................................................................................5-2
Table 5-2 General Commands for Third Party FTP Clients .........................................................................5-4
Table 5-3 General Commands for Third Party TFTP Clients.......................................................................5-6
Table 6-1 Problems Starting the Prestige......................................................................................................6-1
Table 6-2 Problems Connecting with the WAN or Channel/ISP ..................................................................6-1

Prestige 724 G.SHDSL CSU/DSU
xiv Preface
Preface
About Your Prestige
Congratulations on your purchase of the Prestige 724 G.SHDSL CSU/DSU.
The Prestige 724 is a CSU/DSU (Channel Service Unit/Data Service Unit) designed for small offices and
branch offices to provide cost-effective access to high-speed G.SHDSL service. The Prestige is
interoperable with frame relay and PPP routers via the data port interface. The Prestige offers both LAN-
to-LAN and Internet access applications using your existing phone line.
The Prestige supports symmetrical multi-rate data transmission speeds from 144 Kbps to 2320 Kbps. The
actual rate depends on the copper category of your telephone wires, distance from the central office and the
type of DSL service you subscribe to. The Prestige’s data port interface enables fast data transfer in either
half-duplex or full-duplex mode depending on your Ethernet network. See the following section for more
background information on DSL.
The Prestige uses TC-PAM line code with echo cancellation for high data rate transmissions over a single-
twisted telephone wire pair without being affected by bridge taps or mixed cable links. It also provides high
immunity from background noise.
Your Prestige is easy to install. You do not need to set any switches to configure it. Manage the Prestige via
the SMT (System Management Terminal) - a menu-driven interface – using a terminal emulator through the
console port.
Please visit our web site at www.zyxel.com for the latest product information.
About This User’s Guide
This user’s guide covers all operations of the Prestige. It will guide you through the correct configuration of
your Prestige for various applications and show you how to get the best out of the many advanced features
of your CSU/DSU.
Related Documentation
Related documentation includes:
¾A Read Me First document that will help get your Prestige up and running right away. It
contains detailed easy-to-follow instructions, Prestige default settings, handy checklists and
information on setting up your computer.
¾A Support CD. This CD includes:
•This User’s Guide.
•Support Notes (FAQ, Application Notes, Support Tools).
•Links to the ZyXEL Website and Global Support Network.

Prestige 724 G.SHDSL CSU/DSU
Preface xv
General Syntax Conventions
•“Type” means for you to type one or more characters and press the carriage return. “Select” or
“Choose” means for you to select one from the predefined choices.
•The SMT menu titles and labels are in Bold Times font. Menu item choices are in Bold Arial font.
Command and arrow keys are enclosed in square brackets. [ENTER] means the Enter, or carriage
return key; [ESC] means the Escape key and [SPACE BAR] means the Space Bar.
•For brevity’s sake, we will use “e.g.,” as a shorthand for “for instance”, and “i.e.,” for “that is” or “in
other words” throughout this user’s guide.
•The Prestige 724 may be referred to as the Prestige or the P724 in this user’s guide.

Prestige 724 G.SHDSL CSU/DSU
xvi CSU/DSU and DSL Basics
CSU/DSU and DSL Basics
What is a CSU/DSU?
A CSU/DSU (Channel Service Unit/Data Service Unit) is a hardware device that converts a digital data
frame, the communications technology used on a local area network (LAN), into a frame appropriate to a
wide-area network (WAN) and vice versa. It sits between the DTE (Data Terminal Equipment) and a
transmission circuit such as a phone line and converts signals from the DTE (routers, bridges and
multiplexors) into the bipolar digital signals used by digital lines.
What is DSL?
A DSL (Digital Subscriber Line) enhances the data capacity of the existing telephone wire running between
the local telephone company switching offices and most homes and offices. While the wire itself can handle
higher frequencies, the telephone switching equipment is designed to cut off signals above 4,000Hz to filter
noise from the voice line. DSL services make use of signals above the 4,000Hz for data transfer. Several
DSL services offer speeds of up to 52 Mbits/sec. DSL services are symmetrical (traffic flows at the same
speed in both directions) or asymmetrical (the downstream capacity is higher than the upstream capacity).
As carrying distances decrease, data rates increase. This means that users who are beyond a certain distance
from the telephone company’s central office may not be able to obtain the higher speeds for DSL maximum
transmission distances.
What is G.SHDSL?
G.SHDSL (Single-pair High-speed Digital Subscriber Line) is a symmetrical, bi-directional DSL service
that operates on one twisted-pair wire and provides data rates up to 2.3 Mbits/sec. (The “G.” in “G.SHDSL”
is defined by the G.991.2 ITU (International Telecommunication Union) state-of-the-art industry standard).
A G.SHDSL connection is a point-to-point dedicated circuit, meaning that the link is always up and there is
no dialing required.
The Benefits of G.SHDSL
•Continuous Connection You are always online.
•Dedicated Bandwidth Line speed is “symmetric,” i.e., the same bandwidth in both directions.
•Investment Protection Scalability. Offers a flexible upgrade path. You can choose a higher
access speed yourself - no site visit is necessary.
•Low Maintenance Connectivity requires no complex manual configuration; G.SHDSL
equipment is Plug and Play.
•Distance Capabilities G.SHDSL achieves 20% better loop-reach than older versions of
symmetric DSL. (Loop reach defines speed that can be attained at
various distances).

Prestige 724 G.SHDSL CSU/DSU
Getting to Know Your G.SHDSL CSU/DSU 1-1
Chapter 1
Getting to Know Your G.SHDSL CSU/DSU
This chapter covers the key features and main applications of your Prestige.
The Prestige 724 is a CSU/DSU designed for small offices and branch offices to provide cost-effective
access to high-speed G.SHDSL service. The Prestige is interoperable with frame relay and PPP routers via
the Data interface. The Prestige offers both LAN-to-LAN and Internet access applications using your
existing phone line.
1.1 Features of the Prestige
The following features make the Prestige a complete and flexible networking solution for most users.
Data Port Interface
Connects to a PPP/Frame Relay router and allows the router to use broadband service.
High Speed Scalability
One of the best features of G.SHDSL service is its scalability. Your Prestige G.SHDSL CSU/DSU supports
symmetrical multi-rate data transmission speeds from 144 Kbps to 2320 Kbps. You can increase the
capacity of the Internet connection (within certain distance limitations) without changing your ISP or
purchasing new equipment. G.SHDSL’s high symmetrical speeds are ideal for applications like web hosting
and videoconferencing as well as the two-way data traffic needs of businesses.
Symmetrical High Speed Internet Access
The Prestige 724 supports symmetrical transmission rates of up to 2.3 Mbps. For NSP’s (Network Service
Provider) convenience, the Prestige also supports rate management depending on distances and service
charges.
Protocols Supported
¾FRF.8 Frame Relay/ATM PVC Service Interworking Implementation Agreement
¾FRF.5 Frame Relay/ATM PVC Service Interworking Implementation Agreement
¾RFC 1483 Multiple Protocol over AAL5
¾RFC 2364 PPP over AAL5
¾RFC 1490 Multiple Protocol over Frame Relay
¾ATM Forum UNI 3.1/4.0 PVC

Prestige 724 G.SHDSL CSU/DSU
1-2 Getting to Know Your G.SHDSL CSU/DSU
¾F4/F5 loopback, AIS and RDI OAM cells
¾Multiple Protocol Support – Transparent bridging for unsupported network layer protocols.
¾Encapsulation – The Prestige supports FRF8_TRANSLATION, FRF8_TRANSPARENT,
ENCAP_HDLC_RFC2364, FRF.5 and PPP.
Full Network Management
¾Your Prestige offers you a variety of options for network management. It supports password
protected local and remote network management via a telnet connection using SMT (System
Management Interface). It also supports FTP (File Transfer Protocol) server and TFTP (Trivial FTP)
for remote management.
Diagnostics Capabilities
¾The Prestige can perform self-diagnostic tests. These tests check the integrity of the following
circuitry:
•FLASH memory
•G.SHDSL circuitry
•RAM
Ease of Installation
Your Prestige is designed for quick, easy and intuitive installation. Its compact size and light weight make it
easy to position anywhere in your busy office.
Wall-Mounting
On the underside of the housing are two slots that can be used to wall-mount your Prestige.
1.2 Application Scenarios for the Prestige
1.2.1 Internet Access Application
The following figure depicts a typical Internet access application using your Prestige.

Prestige 724 G.SHDSL CSU/DSU
Getting to Know Your G.SHDSL CSU/DSU 1-3
Figure 1-1 Internet Access Application
1.2.2 LAN-to-LAN Application
You can use the Prestige to connect two geographically dispersed networks over the DSL line. A typical
LAN-to-LAN application is shown next.
Figure 1-2 LAN-to-LAN Application