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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 patents 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
Trademarks mentioned in this publication are used for identification purposes only and may be properties of their
respective owners.
ii Copyright
IES-1248 User’s Guide
Interference Statements and Warnings
FCC
Interference Statement:
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.
(2) This device must accept any interference received, including interference that may cause undesired operations.
FCC Warning!
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 in a
commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to cause harmful interference in which
case the user will be required to correct the interference at his own expense.
Notice 1
Changes or modifications not expressly approved by the party responsible for compliance could void the user's
authority to operate the equipment.
This Class B digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe B est conforme à la norme NMB-003 du Canada.
CE Mark Warning:
This is a class A product. In a domestic environment this product may cause radio interference in which case the
user may be required to take adequate measures.
Taiwanese BSMI (Bureau of Standards, Metrology and Inspection) A Warning:
Certifications
Refer to the product page at www.zyxel.com.
Interference Statements and Warnings iii
IES-1248 User’s Guide
Safety Warnings
For your safety, be sure to read and follow all warning notices and instructions.
Refer to the Hardware Specifications appendix for the gauge of wire to use for each connection.
With the AC power model, connect the power cord to the right supply voltage (110V AC in North America
or 230V AC in Europe).
Only a qualified technician should service or disassemble this device.
Always disconnect all telephone lines from this device before servicing or disassembling.
Fuse Warning! Replace a fuse only with a fuse of the same type and rating.
Fan Module Warning! Use the fan module handles when pulling out or pushing in the fan module. Be
careful not to put fingers or objects inside the fan module.
Energy Hazard Warning! Remove all metal jewelry, watches, and so on from your hands and wrists before
servicing this device.
To reduce the risk of fire, use only No. 26 AWG or larger telecommunication line cord.
Place connecting cables carefully so that that no one will step on them or stumble over them. Do NOT
allow anything to rest on the power cables and do NOT locate the product where anyone can walk on the
power cables.
Do NOT expose your device to dampness, dust or corrosive liquids.
Do NOT use this product near water, for example, in a wet basement or near a swimming pool.
Make sure to connect the cables to the correct ports.
Do NOT obstruct the device ventilation slots, as insufficient airflow may harm your device.
Do NOT store things on the device.
Connect ONLY suitable accessories to the device.
Do NOT install nor use your device during a thunderstorm. There may be a remote risk of electric shock
from lightning.
iv Safety Warnings
IES-1248 User’s Guide
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.
ZyXEL Limited Warranty v
IES-1248 User’s Guide
Customer Support
If you have questions about your ZyXEL product or desire assistance, contact ZyXEL Communications
Corporation offices worldwide, in one of the following ways:
Contacting Customer Support
When you contact your customer support representative, have the following information ready:
♦ Product model and serial number.
♦ Firmware version information.
♦ Warranty information.
♦ Date you received your product.
♦ Brief description of the problem and the steps you took to solve it.
Interference Statements and Warnings........................................................................................................................iii
ZyXEL Limited Warranty............................................................................................................................................... v
Customer Support ........................................................................................................................................................vi
List of Figures ..............................................................................................................................................................xv
List of Tables ...............................................................................................................................................................xx
Chapter 1 Getting to know the IES-1248............................................................................................................... 1-1
1.2 System Description................................................................................................................................ 1-1
2.6 Connecting the Frame Ground .............................................................................................................. 2-4
Chapter 3 Front Panel Connections ...................................................................................................................... 3-1
3.1 Front Panel (AC Power Version) ........................................................................................................... 3-1
3.2 Front Panel (DC Power Version) ........................................................................................................... 3-1
3.3 IES-1248 Front Panel Ports................................................................................................................... 3-1
3.4 Front Panel LEDs ..................................................................................................................................3-2
Chapter 5 Power Connections .............................................................................................................................. 5-1
5.1 Power Connections Overview ............................................................................................................... 5-1
5.2 Power Connections ............................................................................................................................... 5-1
5.3 Procedure to Turn on the IES-1248 Power ........................................................................................... 5-2
Chapter 6 Fan Maintenance.................................................................................................................................. 6-1
6.1 Fan Maintenance Introduction............................................................................................................... 6-1
6.2 Removing and Installing the Fan Module.............................................................................................. 6-1
Chapter 7 Web Configurator Introduction ............................................................................................................. 7-1
7.1 Web Configurator Overview .................................................................................................................. 7-1
7.2 Accessing the Web Configurator........................................................................................................... 7-1
7.3 Home Screen......................................................................................................................................... 7-1
7.4 Saving Your Configuration .................................................................................................................... 7-5
Chapter 9 Home and Port Statistics Screens........................................................................................................ 9-1
9.1 Home and Port Statistics Screens Overview ........................................................................................ 9-1
9.2 Home Screen......................................................................................................................................... 9-1
10.2 System Information.............................................................................................................................. 10-1
10.3 General Setup ..................................................................................................................................... 10-5
10.7 IP Setup ............................................................................................................................................. 10-11
10.8 ENET Port Setup ...............................................................................................................................10-12
Chapter 11 ADSL Port Setup............................................................................................................................... 11-1
11.7 xDSL Port Setup.................................................................................................................................. 11-3
11.8 xDSL Port Setting ................................................................................................................................ 11-5
11.13 Line Rate Information ....................................................................................................................11-22
11.14 Line Performance ..........................................................................................................................11-24
11.15 Line Data .......................................................................................................................................11-27
12.1 Introduction to VLANs.......................................................................................................................... 12-1
12.2 Introduction to IEEE 802.1Q Tagged VLAN ........................................................................................12-1
12.3 VLAN Status ........................................................................................................................................ 12-3
Chapter 16 MAC Filter.........................................................................................................................................16-1
16.1 MAC Filter Introduction........................................................................................................................16-1
x Table of Contents
IES-1248 User’s Guide
16.2 MAC Filter Configuration ..................................................................................................................... 16-1
Chapter 17 Spanning Tree Protocol .................................................................................................................... 17-3
17.1 RSTP (Rapid Spanning Tree Protocol) and STP (Spanning Tree Protocol) ...................................... 17-3
17.2 STP Status .......................................................................................................................................... 17-5
Chapter 18 Port Authentication ........................................................................................................................... 18-1
18.1 Introduction to Authentication.............................................................................................................. 18-1
18.2 Port Authentication Configuration........................................................................................................ 18-1
Chapter 19 Port Security ..................................................................................................................................... 19-1
19.1 About Port Security ............................................................................................................................. 19-1
19.2 Port Security Setup ............................................................................................................................. 19-1
22.1 About Access Control.......................................................................................................................... 22-1
22.2 Access Control Overview .................................................................................................................... 22-1
22.3 About SNMP........................................................................................................................................ 22-1
22.4 Service Access Control Configuration................................................................................................. 22-6
25.2 Log Format ..........................................................................................................................................25-2
25.3 Line Diagnostics Test Parameters.......................................................................................................25-4
Chapter 26 MAC Table ...................................................................................................................................26-1
26.1 Introduction to MAC Table...................................................................................................................26-1
26.2 Viewing the MAC Table .......................................................................................................................26-2
Chapter 32 MAC Commands ..............................................................................................................................32-1
32.1 MAC Commands Overview ................................................................................................................. 32-1
32.2 MAC Filter Commands ........................................................................................................................ 32-1
xii Table of Contents
IES-1248 User’s Guide
32.3 MAC Count Commands ...................................................................................................................... 32-3
Chapter 35 IP Commands................................................................................................................................... 35-1
35.1 IP Commands Introduction.................................................................................................................. 35-1
35.2 IP Settings and Default Gateway ........................................................................................................35-1
35.3 General IP Commands........................................................................................................................ 35-2
35.4 Statistics IP Command ........................................................................................................................ 35-4
Chapter 36 Firmware and Configuration File Maintenance ................................................................................ 36-1
36.1 Firmware and Configuration File Maintenance Overview ................................................................... 36-1
40.1 The SYS or PWR LED Does Not Turn On .......................................................................................... 40-1
40.2 The ALM LED Is On ............................................................................................................................ 40-1
40.3 SFP LNK LEDs Do Not Turn On ......................................................................................................... 40-1
Table of Contents xiii
IES-1248 User’s Guide
40.4 1000/100 LEDs Do Not Turn On ......................................................................................................... 40-2
40.5 1000/100 Ethernet Port Data Transmission ........................................................................................ 40-2
40.6 DSL Data Transmission....................................................................................................................... 40-3
40.7 There Is No Voice on an ADSL Connection ........................................................................................40-3
40.9 Local Server.........................................................................................................................................40-5
40.10 Data Rate......................................................................................................................................... 40-5
40.16 Resetting the Defaults .....................................................................................................................40-7
40.17 Recovering the Firmware ................................................................................................................40-9
Appendix A Hardware Specifications........................................................................................................................A
Appendix B Removing and Installing a Fuse........................................................................................................... G
Appendix C Virtual Circuit Topology .......................................................................................................................... I
Index .............................................................................................................................................................................K
xiv Table of Contents
IES-1248 User’s Guide
List of Figures
Figure 1-1 MTU Application....................................................................................................................................... 1-5
Figure 3-1 Front Panel (AC Power Version).............................................................................................................. 3-1
Figure 3-2 Front Panel (DC Power Version) ............................................................................................................. 3-1
Figure 3-3 SFP Mini GBIC Slot ................................................................................................................................. 3-3
Figure 6-1 Fan Module Thumbscrews....................................................................................................................... 6-1
Figure 6-2 Removing the Fan Module....................................................................................................................... 6-2
Figure 6-3 Fan Module Removed ............................................................................................................................. 6-2
Figure 8-2 Basic Setting IP Setup Menu ................................................................................................................... 8-2
List of Figures xv
IES-1248 User’s Guide
Figure 8-3 IP Setup....................................................................................................................................................8-2
Figure 8-4 Basic Setting xDSL Port Setup Menu ...................................................................................................... 8-3
Figure 8-5 xDSL Port Setup ......................................................................................................................................8-3
Figure 8-6 Deleting a PVC.........................................................................................................................................8-3
Figure 8-8 Adding a New Channel.............................................................................................................................8-4
Figure 8-9 Copying the PVC......................................................................................................................................8-5
Figure 9-2 Ethernet Port Statistics.............................................................................................................................9-3
Figure 9-3 ADSL Port Statistics ................................................................................................................................. 9-6
Figure 10-1 System Information .............................................................................................................................. 10-2
Figure 10-2 General Setup ...................................................................................................................................... 10-5
Figure 10-3 Port Isolation with Standalone Switch Mode Example......................................................................... 10-8
Figure 10-4 Port Isolation with Daisychain Switch Mode Example ......................................................................... 10-9
Figure 10-6 IP Setup ............................................................................................................................................. 10-11
Figure 10-7 ENET Port Setup................................................................................................................................10-12
Figure 11-1 xDSL Port Setup................................................................................................................................... 11-3
Figure 11-8 Port Profile.......................................................................................................................................... 11-12
Figure 11-9 PCR, SCR, MCR and MBS in Traffic Shaping ................................................................................... 11-16
Figure 11-10 TAT, CDVT and BT in Traffic Shaping .............................................................................................. 11-16
Figure 11-14 Line Rate Information....................................................................................................................... 11-23
Figure 11-15 Line Performance............................................................................................................................. 11-25
Figure 11-16 Line Data.......................................................................................................................................... 11-27
Figure 16-1 MAC Filter ............................................................................................................................................ 16-1
Figure 17-1 STP Root Ports and Designated Ports ................................................................................................ 17-4
Figure 17-2 Spanning Tree Protocol: Status ........................................................................................................... 17-5
Figure 17-3 Spanning Tree Protocol: Configuration................................................................................................ 17-7
Figure 26-1 MAC Table Filtering Flowchart ............................................................................................................. 26-2
Figure 26-2 MAC Table............................................................................................................................................ 26-3
Figure 29-4 Statistics Port Command Example....................................................................................................... 29-3
Figure 30-1 Show Command Example ...................................................................................................................30-2
Figure 31-1 Garptimer Show Command Example ..................................................................................................31-2
Figure 31-7 Modifying the Static VLAN Example .................................................................................................... 31-5
Figure 31-8 VLAN Frame Type Command Example............................................................................................... 31-6
Figure 31-9 CPU VLAN Configuration and Activation Example..............................................................................31-7
Figure 31-10 Deleting Default VLAN Example ........................................................................................................ 31-7
Figure 31-11 VLAN Priority Command Example ..................................................................................................... 31-8
Table 9-1 Home .........................................................................................................................................................9-2
Table 9-2 Ethernet Port Statistics ..............................................................................................................................9-3
Table 9-3 ADSL Port Statistics................................................................................................................................... 9-6
Table 10-1 System Information................................................................................................................................ 10-2
Table 10-2 General Setup........................................................................................................................................10-5
Table 10-4 IP Setup ...............................................................................................................................................10-12
Table 10-5 ENET Port Setup .................................................................................................................................10-12
Table 11-1 Maximum Transfer Rates of the ADSL Ports ......................................................................................... 11-1
Table 11-2 xDSL Port Setup .................................................................................................................................... 11-3
Table 11-3 xDSL Port Setup .................................................................................................................................... 11-5
Table 11-9 Line Rate Information........................................................................................................................... 11-23
Table 11-10 Line Performance............................................................................................................................... 11-25
Table 11-11 Line Data............................................................................................................................................ 11-27
Table 12-2 VLAN Status ..........................................................................................................................................12-4
Table 12-4 VLAN Port Setting..................................................................................................................................12-7
Table 16-1 MAC Filter.............................................................................................................................................. 16-1
Table 17-2 RSTP Port States ..................................................................................................................................17-4
Table 17-3 Spanning Tree Protocol: Status............................................................................................................. 17-5
Table 17-4 Spanning Tree Protocol: Configuration..................................................................................................17-7
Table 18-1 Port Authentication: RADIUS................................................................................................................. 18-2
Table 18-2 Port Authentication: 802.1x ................................................................................................................... 18-4
Table 19-1 Port Security .......................................................................................................................................... 19-1
Table 25-4 Line Diagnostics Test Parameters......................................................................................................... 25-4
Table 26-1 MAC Table............................................................................................................................................. 26-3
Table 40-9 Local Server Troubleshooting................................................................................................................ 40-5
This user’s guide gives hardware specifications and explains web configurator and command line configuration,
management, and troubleshooting for the IES-1248 Integrated Ethernet Switch.
Online Registration
Register your ZyXEL product online at www.zyxel.com for free future product updates and information.
General Syntax Conventions
Mouse action sequences are denoted using a comma. For example, click Start, Settings, Control Panel,
Network means first you click Start, click or move the mouse pointer over Settings, then click or move the mouse pointer over Control Panel and finally click (or double-click) Network.
“Enter” means for you to type one or more characters. “Select” or “Choose” means for you to use one of
the predefined choices.
Predefined choices are in Bold Arial font.
Button and field labels, links and screen names in are in Bold Times New Roman font.
A single keystroke is in Arial font and 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 shorthand for “for instance”, and “i.e.,” for “that is” or “in other
words”.
Naming Conventions
• The IES-1248 Integrated Ethernet Switch may be referred to as the IES-1248, the IES, the switch or,
simply, as the device.
• “IES-1248” refers to the IES-1248-71 for ADSL over POTS (Annex A). “IES-1248” also refers to the
IES-1248-73 for ADSL over ISDN (Annex B). Differentiation is made where needed.
• This user’s guide refers to an Ethernet device as a switch in general for feature background information.
Related Documentation
Web Configurator Online Help
Embedded web help for descriptions of individual screens and supplementary information.
Glossary and ZyXEL Web Site
Please refer to www.zyxel.com for an online glossary of networking terms or the ZyXEL download library for
additional support documentation.
Preface xxiii
IES-1248 User’s Guide
Firmware Naming Conventions
A firmware version includes the model code and release number as shown in the following example.
Firmware Version: V3.50(LS.0)
“LS” is the model code.
“LS” denotes the IES-1248-71 for ADSL over POTS (Annex A).
“TR” denotes the IES-1248-73 for ADSL over ISDN (Annex B).
“0” is this firmware’s release number. This varies as new firmware is released. Your firmware’s release
number may not match what is displayed in this User’s Guide.
.
xxiv Preface
IES-1248 Overview
Part I:
IES-1248 Overview
This part introduces the general features and default settings of the Integrated Ethernet Switch.
I
IES-1248 User’s Guide
Chapter 1
Getting to know the IES-1248
This chapter describes the key features and applications of your IES-1248
1.1 Integrated Ethernet Switch Overview
The Integrated Ethernet Switch is an IP-based DSLAM (Internet Protocol Digital Subscriber Line Access
Multiplexer) that connects ADSL subscribers to the Internet.
As a high-performance yet compact platform, the IES-124 can conveniently deliver broadband Internet access to
telephone company central offices, multi-tenant units (MTUs), hospitals, hotels, schools, university campuses and
ISPs. The IES-1248’s low cost and easy management make it a perfect DSL-provider solution.
The IES-1248 provides ADSL service for 48 subscribers over existing telephone wiring, thus avoiding the cost and
hassle of installing new wiring. ADSL allows you to extend the reach of broadband services up to 18,000 feet. This
makes the IES-1248 perfect for providing high bandwidth broadband service to subscribers who are spread out over
a large area. The built in splitter combines voice service and ADSL on the same telephone wiring.
The IES-1248 is easy to manage.
1.2 System Description
Four Telco-50 Connectors
There are four Telco-50 connectors for ADSL and POTS connections.
1000/100 Mbps Ethernet Ports
The IES-1248 has two 1000/100Mbps auto-negotiating, auto-crossover Ethernet ports.
They allow you to:
Connect the IES-1248 to a second level switch
Daisy-chain other switches
Two Slots for Mini GBIC Modules
The mini GBIC (Gigabit Interface Converter) module transceivers allow flexibility in connection options. You can
use mini GBIC transceivers for fiber connections to backbone Ethernet switches.
Stacking
Daisy-chain up to three IES-1248s (or other Ethernet devices).
Integrated Splitters
The integrated DSL splitter eliminates the need to use external splitters that separate the voice-band and ADSL
signals.
Getting to know the IES-1248 1-1
IES-1248 User’s Guide
Console Port
Use the console port for local management of the IES-1248.
Fans
The fans cool the IES-1248 sufficiently to allow reliable operation of the IES-1248, even in poorly ventilated rooms
or basements.
IP Protocols
IP Host (No routing)
Telnet for configuration and monitoring
SNMP for management
• SNMP MIB II (RFC 1213)
• SNMP v1 RFC 1157
• SNMPv2, SNMPv2c or later version, compliant with RFC 2011 SNMPv2 MIB for IP, RFC 2012
SNMPv2 MIB for TCP, RFC 2013 SNMPv2 MIB for UDP
• Ethernet MIBs RFC 1643
• Bridge MIBs (RFC 1493, 2674)
• SMI RFC 1155
• Multiple Protocols over AAL5 (RFC 1483)
ADSL Compliance
• Multi-Mode ADSL standard
G.dmt (ITU-T G.992.1)
G.lite (ITU-T G.992.2)
G.hs (ITU-T G.994.1)
ANSI T1.413 issue 2
ADSL2: ITU-T G.992.3, G.992.4
ADSL2+: ITU-T G.992.5
• Rate adaptation support
IEEE 802.1p Priority
1
Your IES-1248 uses IEEE 802.1p Priority to assign priority levels to individual PVCs.
Multiple PVC and ATM QoS
1
At the time of writing, the IES-1248 only supports the line rates for ADSL2 and ADSL2+ (not other features); and the IES-
1248’s interoperability when using ADSL2 and ADSL2+ has not yet been tested.
1-2 Getting to know the IES-1248
IES-1248 User’s Guide
The IES-1248 allows you to use different channels (also called Permanent Virtual Circuits or PVCs) for different
services or subscribers. Define channels
2
on each DSL port for different services or levels of service and assign
each channel a priority. ATM Quality of Service (QoS) allows you to regulate the average rate and fluctuations of
data transmission. This helps eliminate congestion to allow the transmission of real time data (such as audio and
video).
IEEE 802.1x Port-based Authentication
The IES-1248 supports the IEEE 802.1x standard for centralized user authentication and accounting management
through an optional network authentication (RADIUS) server.
Management
• Remote configuration backup/restore and firmware upgrade
• SNMP manageable
• Text-based management locally via console port and remotely via telnet
• Editable plain text based configuration file
Security
Password protection for system management
VLAN
MAC (Media Access Control) Count Filter
You can limit the number of MAC addresses that may be dynamically learned on a port. You may enable/disable
the MAC count filter on individual ports.
Static Multicast Filter
Use the static multicast filter to allow incoming frames based on multicast MAC address(es) that you specify. This
feature can be used in conjunction with IGMP snooping to allow multicast MAC address(es) that are not learned by
IGMP snooping.
IGMP Snooping
With IGMP snooping, group multicast traffic is only forwarded to ports that are members of that group. IGMP
Snooping generates no additional network traffic, allowing you to significantly reduce multicast traffic passing
through your IES-1248.
System Monitoring
• System status (link status, rates, statistics counters)
• Temperatures, voltage reports and alarms.
System Error Logging
2
Up to eight channels on each DSL port at the time of writing.
Getting to know the IES-1248 1-3
IES-1248 User’s Guide
The IES-1248’s system error log will record error logs locally. These logs may be viewed again after a warm
restart.
Alarm LED
An ALM (alarm) LED lights when the IES-1248 is overheated, the fans are not working properly, the voltage
readings are outside the tolerance levels or an alarm has been detected on the ALARM input pins.
Bandwidth Control
The IES-1248 supports rate limiting in 64Kbps increments allowing you to create different service plans
Quality of Service
The IES-1248 has four priority queues so you can ensure mission-critical data gets delivered on time.
Follows the IEEE 802.1p priority setting standard.
Flow Control
The IES-1248 uses IEEE 802.3 flow control to manage the sending of traffic so the sending device does not
transmit more than the receiving device can process. This helps prevent traffic from being dropped and having to be
resent.
1.3 Applications
These are the main applications for the IES-1248:
Internet access and multimedia services for Multiple Tenant Units (MTU).
Other applications include telemedicine, surveillance systems, remote servers systems, cellular base
stations and high-quality teleconferencing.
1.3.1 MTU Application
The following diagram depicts a typical application of the IES-1248 with ADSL modems, in a large residential
building, or multiple tenant unit (MTU), that leverages existing phone line wiring to provide Internet access to all
tenants. ADSL service can coexist with voice service on the same line.
1-4 Getting to know the IES-1248
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