THOMSON THG520 User manual

digital ⎢BROADBAND
VOICE OVER IP CABLE MODEM
THG520/DHG525

Important Information
ii
CAUTION
Disconnect power before
servicing.
CAUTION
This device is intended for
indoor operation only.
Telephone jacks Line 1 and
Line 2 must not be
connected to outside
wiring.
CAUTION
To ensure reliable operation and to prevent
overheating, provide adequate ventilation for this
modem and keep it away from heat sources. Do not
locate near heat registers or other heat-producing
equipment. Provide for free air flow around the cable
modem and its power supply.
NORTH AMERICAN CABLE INSTALLER:
This reminder is provided to call your attention to Article 820-40 of the National Electrical Code
(Section 54 of the Canadian Electrical Code, Part 1) which provides guidelines for proper
grounding and, in particular, specifies that the cable ground shall be connected to the grounding
system of the building as close to the point of cable entry as practical.
Euro-DOCSIS compliant (THG520)
This product was designed according to Euro-DOCSIS Specifications but can also receive signals
according to the DOCSIS specifications if the used frequencies are between 112-858 MHz.
PacketCable and DOCSIS compliant (DHG525)
This product was designed according to Data Over Cable Service Interface Specifications and
PacketCable Voice Over IP Cable Telephony Specifications.
It will operate on any DOCSIS-compliant Hybrid Fiber Coax (HFC) cable system and offers DOCSIS
and PacketCable Baseline Privacy to promote secure internet transactions and PC-secure
telephone service.
Operating Information
Operating Temperature:0˚- 40˚C (32˚- 104˚F)
Storage Temperature:-30˚to 65˚C
If you purchased this product at a retail outlet, please read the following:
Product Information

Illustrations contained in this document are for representation only. iii
Keep your sales receipt to obtain warranty parts and service and for proof of purchase. Attach it
here and record the serial and model numbers in case you need them. The numbers are located
on the back of the product.
Model No. ____________________________Serial No ________________________________
Purchase Date: ________________________Dealer/Address/Phone: _________________________

Table of Contents
iv
Chapter 1: Connections and Setup
Introduction ............................................................................................................................ 1
Voice Over IP Cable Modem Features................................................................................. 1
What’s on the CD-ROM ...................................................................................................... 1
Accessing the Diagnostics Display through the CD-ROM.................................................... 1
Computer Requirements.................................................................................................... 2
Placing the Rubber Feet on the Cable Modem.................................................................... 2
Cable Modem Overview THG520.............................................................................................. 3
Front Panel........................................................................................................................ 3
Rear Panel......................................................................................................................... 4
Wall Mounting...................................................................................................................4
Cable Modem Overview DHG525 ............................................................................................. 6
Front Panel........................................................................................................................ 6
Rear Panel......................................................................................................................... 7
Wall Mounting...................................................................................................................7
Installing the Battery ......................................................................................................... 8
Relationship Among the Devices ..................................................................................... 10
What the Modem Does .................................................................................................... 10
What the Modem Needs to Do Its Job...............................................................................10
Contact Your Local Cable Company................................................................................. 11
Connecting the Cable Modem to a Single Computer............................................................... 13
Attaching the Cable TV Wire to the Cable Modem............................................................ 13
Important Connection Information .................................................................................. 14
USB Connection to One Computer ................................................................................... 14
Using Windows 2000 for USB Connection ........................................................................ 15

Table of Contents
Illustrations contained in this document are for representation only. v
Using Windows Me for USB Connection............................................................................ 18
Using Windows XP for USB Connection ............................................................................ 19
Ethernet Connection to One Computer ............................................................................ 23
Connecting More Than Two Computers to the Cable Modem........................................... 24
Telephone or Fax Connection.......................................................................................... 25
Activating the Cable Modem.................................................................................................. 26
Frequently Asked Questions .................................................................................................. 27
General Troubleshooting ....................................................................................................... 29
FCC Declaration of Conformity and Industry Canada Information........................................... 31
Service Information................................................................................................................ 31
Glossary ................................................................................................................................ 33

Chapter 1: Connections and Setup
Illustrations contained in this document are for representation only. 1
Introduction
Voice Over IP Cable Modem Features
zProvides two-line telephone service
zCapable of receiving data at rates of up to 10 Megabits per second
zAble to send and receive data over the cable line
zAble to connect multiple computers through 10/100 BaseT Ethernet, USB at the same
time (if applicable and your service provider offers multiple computer connections)
zPlug-and-play operation for easy setup and installation
What’s on the CD-ROM
Insert the cable modem CD-ROM into your CD-ROM drive to view troubleshooting tips, the
internal diagnostics, and other valuable information.
Note: You will need to use the CD-ROM to install the USB driver if you are connecting via the USB
port.
CD-ROM Contents:
zLinks to RCA and Thomson web sites
zElectronic file of the instruction book in additional languages
zUsage and troubleshooting tips
Accessing the Diagnostics Display through the CD-ROM
A button on the CD-ROM menu called “Look at Diagnostics” (found under the “About My Cable
Modem” menu) launches your browser and displays status and diagnostic information stored
within the modem in HTML format.
Your PC must receive an IP address assignment from the Cable company’s server, over the cable
network. You may want to “bookmark” the IP address in your browser after the diagnostics page
is displayed.
DOCSIS and PacketCable are trademarks of Cable Television Laboratories, Inc.

Chapter 1: Connections and Setup
2
Computer Requirements
For the best possible performance from your cable modem, your personal computer must meet
the following minimum system requirements (note that the minimum requirements may vary by
cable company):
IBM PC COMPATIBLE MACINTOSH**
CPU Pentium preferred PowerPC or higher
System RAM 16MB (32MB preferred) 24MB (32MB preferred)
Operating System Windows* NT/2000/Me/XP,
Linux Mac OS** 7.6.1 or higher
Available Disk Space 125MB 50MB
Sound Card Required for audio on CD-ROM N/A
Video VGA or better (SVGA preferred) VGA or better (SVGA built-in preferred)
CD-ROM Drive Required Required
10BaseT or 100BaseT 10BaseT or 100BaseTEthernet
An Ethernet card makes it possible for your computer to pass data to
and from the internet. You must have an Ethernet card and software
drivers installed in your computer. You will also need a standard
Ethernet cable to connect the Ethernet card to your cable modem.
USB (Windows 2000/ME/XP only)
USB Port
The Universal Serial Bus is a high-speed bus that enables your
computer to communicate simultaneously with a variety of
peripherals. However, if you have other peripherals that send and
receive a lot of information, such as speakers, printers or scanners, we
recommend using an Ethernet card to support this modem.
*Windows is a trademark of Microsoft Corporation.
**Macintosh and the Mac OS are trademarks of Apple Computer, Inc.
Placing the Rubber Feet on the Cable Modem
A set of rubber pads has been packaged with your modem. These pads (or "feet") can be attached
to keep the modem from sliding around on your desktop.

Chapter 1: Connections and Setup
Illustrations contained in this document are for representation only. 3
Cable Modem Overview THG520
Front Panel
The following illustration shows the front panel of the THG520 model:
The LEDs on the front panel are described in the table below (from left to right):
THG520
Tel 2 Tel 1 Message Cable
Activity Cable Link PC Link Internet Description
X X OFF OFF OFF OFF FLASH
Tuning
(Searching downstream signal)
X X OFF OFF OFF FLASH FLASH
Ranging - Awaiting Response
(DS carrier acquire, ranging in process but
RNG-RSP has not been detected)
X X OFF OFF OFF FLASH FLASH
Any RNG-RSP detected
(Normalizing power level and timing offset)
X X OFF OFF FLASH FLASH FLASH
Connecting
(Ranging complete, DHCP in progress)
X X OFF FLASH FLASH FLASH FLASH
Configuring
(DHCP complete, configuration file download in
process)
X X FLASH FLASH FLASH FLASH FLASH
Registering and Baseline Privacy Initializing
(configuration file download complete, initialize
BPI if BPI is ON, registration in process)
Start-up
Operation
X X Enter Normal Operation Mode Registration complete
X X X X X X OFF
ON Internet ON-OFF switch off Internet ON-OFF switch on
X X X X X
OFF
FLASH
ON X NO Ethernet/USB carrier present
Ethernet/USB TX/RX traffic
Ethernet/USB carrier present, no traffic
X X X X
OFF
FLASH
ON X X
NO Cable Link
Cable BSS/OSS has set the CM into
de-activated state
CM is registered
X X X OFF
FLASH X X X
Internet ON-OFF switch off/No RF DS/US
network traffic
RF DS/US network traffic
Normal
Operation
X X OFF
FLASH X X X X
No message is delivered by the MSO
Email is available fro the user on the server
(Implementation of the message waiting LED
will be via Proprietart MIB)
X X X X Wink X X
No service
Operation Three seconds ON followed by a flash OFF NACO =OFF BPI unauthorize (when BPI is ON)

Chapter 1: Connections and Setup
4
OFF FLASH MTA DHCP
FLASH OFF MTA SNMP/TFTP
MTA
initialization FLASH FLASH RSIP
ON ON Both Lines On-Hook
ON FLASH Tel1 Off-hook, Tel2 On-hook
FLASH ON Tel1 On-hook, Tel2 Off-hook
MTA
Operation
FLASH FLASH
<CM Normal Operation>
Both Lines Off-Hook
ON FLASH FLASH FLASH FLASH FLASH FLASH
SW Download
Operation FLASH ON From Right to Left A software download and while updating the
FLASH memory
Rear Panel
12VDC: 12V Power connector
CM RESET: Reset this cable modem to the factory settings
Telephony (LINE1/LINE2): RJ-11 Phone set connector
ETHERNET: Ethernet 10/100 BaseT RJ-45 connector
USB: USBConnector
EMTA RESET: Reset this cable modem
CABLE: F-Connector
Wall Mounting
The number of the screw: 2 pcs
Direction for wall mounting: LED panel upward.
Dimension for the screw: TBD
There are 3 slots on the underside of the Cable Modem that can be used for wall mounting: