Corecess 3121 User manual

| Copyright |
CopyrightⓒCorecess All rights Reserved.
No part of this book shall be reproduced, stored in a
retrieval system, or transmitted by any means, electronic,
mechanical, photocopying, recording, or otherwise,
without written permission from the publisher.
The specifications and information regarding the products
in this manual are subject to changed without notice.
| Trademark Credit |
Corecess 3121 is registered trademark of Corecess Inc.
Windows is registered trademark of Microsoft Corp.
Corecess Inc.
500-2, Sangdaewon-dong, Jungwon-ku, Sungnam-city,
Kyungki-do, Korea, 462-120
TEL: [phone] FAX: [phone]
http://www.corecess.com

Using This Document
Thank you for using the product of Corecess. This manual will show you how to set up the
Corecess 3121 ADSL modem, and how to customize its configuration to get the most out of your
new product.
This user manual uses the following conventions:
Note: Introduces useful item for the use of product, reference, and its related materials.
Caution: Explains possible situations or conditions of improper operation and possibility of losing data
and provides suggestions how to deal with those cases.
Table of Contents
Introduction ..................................................................... 4
Key Features ............................................................. 4
System Requirement ................................................. 4
Getting to Know the Corecess 3121 ......................... 5
Unpacking the Box ..................................................... 5
Front Panel ................................................................. 6
Rear Panel ................................................................. 7
Connecting Hardware .................................................. 8
Connecting Telephone/ADSL Line .............................. 9
Connecting PC ........................................................... 9
Connecting Console Terminal ..................................... 9
Connecting Power ................................................... 10
Configuring Your Computers .................................... 11
Before you begin ..................................................... 11
Windows XP ............................................................ 11
Windows 2000/NT ................................................... 12
Windows 95/98/ME ................................................. 13
Troubleshooting ........................................................... 14
Technical Specifications ............................................ 16

Corecess 3121 Installation Guide
4
Introduction
The Corecess 3121 is an Asymmetric Digital Subscriber Line (ADSL) modem used for home
connectivity to an ADSL service provider network. The Corecess 3121 ADSL modem receives
adaptive data rates of up to 24Mbps downstream and transmits 1Mbps upstream.
Key Features
The Corecess 3121 ADSL modem provides the following key features:
yInternal ADSL modem for high-speed Internet access.
y10/100Base-T Ethernet router to provide Internet connectivity to all computers on your LAN.
yNetwork address translation (NAT), Firewall, and IP filtering functions to provide security for
your LAN.
yNetwork configuration through DHCP Server and DHCP Relay.
yServices including IP route and DNS configuration, RIP, and IP and DSL performance
monitoring.
yConfiguration program you access via an HTML browser.
yQuality of Service for traffic routed and/or bridged by the modem.
System Requirement
In order to use the Corecess 3121, you must have the following:
yADSL service up and running on your telephone line, with at least one public Internet address
for your computer.
yOne or more computers with an Ethernet 10Base-T/100Base-T network interface card (NIC).
yAn Ethernet hub/switch, if you are connecting the device to more than one computer on an
Ethernet network.
yFor system configuration using the supplied web-based program: a web browser such as
Internet Explorer v5.0 or later, or Netscape v4.7 or later.

5
Getting to Know the Corecess 3121
Unpacking the Box
Check the shipping carton carefully to ensure that the contents include the items you ordered.
yCorecess 3121 ADSL modem
yPower adapter and power cord
yEthernet cable (“straight-through” type)
yStandard phone/DSL line cable
yManual CD
Note: The Ethernet cable for the Corecess 3121 should be assembled with a ferrite core which meets
the following specification:
yInternal diameter: 9.50mm
yExternal diameter: 18.40±0.40mm
yLength: 28.00±0.40mm
Note: The following hardware is not provided but neccssary to install and configure the Corecess
3121. Before installing the Corecess 3121, prepare the following hardware:
yMicro-filter or splitter (provided separately by your service provider)
yPC with Ethernet port or adapter (optional)
Caution: To reduce the risk of fire, use only No. 26AWG or larger telecommunication line cord.
Corecess 3121
Power adpater
Ethernet cable (straight-through type)
Phone/DSL line cable(RJ-11)
Power cord
Manual CD
Corecess3121
PWR
DSL
ACT
LAN

Corecess 3121 Installation Guide
6
PWR
DSL
ACT
LAN
Front Panel
The front panel contains lights called LEDs that indicate the status of the unit.
Label Color Function
PWR Green On : The Corecess 3121 is powered on.
Off : The Corecess 3121 is powered off.
DSL Green
On : ADSL link is established and active.
Blinking : ADSL link is training.
Off : No ADSL link.
ACT Green Blinking : ADSL data is sending/receiving through the port.
Off : No ADSL data.
LAN Green
On : LAN link is established and active.
Blinking : Ethernet data is sending/receiving through the port.
Off : No LAN link.

7
5V DC
OFF ON CONSOL LAN PHONE LINE
Rear Panel
The rear panel contains the ports for the unit’s data and power connections.
Label Function
OFF/ON Switches the unit on or off.
5V DC Connects to the supplied power converter cable.
CONSOL Connects the device to a console terminal.
LAN Connects the device to your PC’s Ethernet port, or to the uplink port on your LAN’s
hub, using the cable provided.
PHONE Connects the device to a telephone jack for DSL communication.
LINE Connects the device to a telephone jack for DSL communication.

Corecess 3121 Installation Guide
8
5V DC
OFF ON CONSOL LAN PHONE LINE
Connecting Hardware
The Corecess 3121 supports both the POTS splitter and micro-filter phone configurations. Before
cabling the Corecess 3121, verify your configuration with your service provider. This section
describes how to connect the Corecess 3121 to the phone jack, the power outlet, and your
computer or network.
The following figure illustrates the hardware connections. The layout of the ports on your device
may vary from the layout shown. Refer to the steps that follow for specific instructions.
Phone cable
Console cable
Console terminal
Phone
ADSL
cable
Ethernet cable
Powe
r
adapte
r
PC
Ethernet cable
Hub or switch
(for local area)
ETHERNET connection: nor o
n
o
PC
Ethernet cable
PC

9
PHONE LINE
CONSOL
5V DC
OFF ON
LAN
PHONE LINE
CONSOL
5V DC
OFF ON
LAN
Connecting Telephone/ADSL Line
nConnect the provided ADSL cable to the PHONE
port of the Corecess 3121 and a telephone.
oUnplug the telephone line from the telephone
and plug the line to the LINE port of the Corecess
3121.
Connecting PC
Connect the provided Ethernet cable to the LAN port
of the Corecess 3121 and then connect the other end
of the cable to Ethernet port on the NIC installed to
your PC.
Note: If you are connecting a LAN to the Corecess 3121, you must use a “crossover” Ethernet cable
(not provided) to attach a regular hub or switch port. The crossover cable is wired differently than the
cable you would use to connect to a hub. When you compare the colored wires on each end of a
straight-through cable, they will be in the same sequence; on crossover cables, they will not. Contact
your ISP for assistance.
Connecting Console Terminal
Caution: General users need not to connect a console terminal. It is only for the ADSL Service Provider.
Connect a console cable to the CONSOL port of the
Corecess 3121 and then connect the other end of the
cable to the terminal or a PC.
n
o
PHONE LINE
CONSOL
5VDC
OFF ON
LAN

Corecess 3121 Installation Guide
10
PHONE LINE
CONSOL
5V DC
OFF ON
LAN
Connecting Power
Caution: You must use the power adapter provided with the Corecess 3121.
nConnect the provided power supply cable
into the 5V DC port of the Corecess 3121.
oConnect the provided power cord to the
power supply and connect the other end of
the cord to an appropriate electrical outlet.
Caution: You must power on the Corecess 3121 before powering on your PC. If you power on your PC
first, PC’s IP address may not be properly assigned.

11
Configuring Your Computers
This section provides instructions for configuring the Internet settings on your computers to work
with the Corecess 3121.
Before you begin
By default, the Corecess 3121 automatically assigns all required Internet settings to your PCs. You
need only to configure the PCs to accept the information when it is assigned. Follow the
instructions that correspond to the operating system installed on your PC.
Caution: When you configure your computer, leave the default value of any other configuration that
is not mentioned in the following description.
Windows XP
1. In the Windows task bar, click the Start button and then select
Control Panel. (Figure 1)
2. Double-click the Network icon at the <Control Panel> window.
3. Right-click the Local Area Connection icon at the <Network
Connections> windows and select Properties. (Figure 2)
4. In the <Local Area Connection Properties> dialog box, select the
Internet Protocol (TCP/IP) in the ‘This connection uses the following
items’ list and click . (Figure 3)
5. In the <Internet Protocol (TCP/IP) Properties)> dialog box, click the radio button labeled Obtain
an IP address automatically. Also click the radio button labeled the Obtain DNS server address
automatically. (Figure 4)
6. Click twice to confirm your changes, and close the Control Panel.
Figure 1
Figure 3Figure 4
Figure 2