TURBOCOMM EC420 User manual

EC420 User’s Manual
Introduction
Important Rules for safe Operation
In addition to the careful attention devoted to quality standards in the manufacture of your
TurboComm DOCSIS Cable modem, safety is a major factor in the design of every product.
However, safety is your responsibility, too.
This section lists important information that will help assure your enjoyment and proper use of the
TurboComm Cable Modem and accessory equipment. Please read them carefully before operating
and using your modem.
Installation
Read and Follow Instructions
You should read all the safety and operating instructions before operating the modem. Follow all
operating instructions.
Retain Instructions
You should save all the safety and operating instructions, for your future reference.
Heed Warnings
Comply with all warnings on the products and in the operating instructions.
Check Power Sources
Operate this product only from the type of power source indicated on the product’s marking label. If
you are not sure of the type of power supplied to your home, consult your dealer or local power
company.
Be Careful of Overloading
Do not overload wall outlets or extension cords, as this can result in a risk of fire or electric shock.
Overloaded AC outlets, extension cords, frayed power cords, damaged or cracked wire insulation,
and broken plugs are dangerous. They may result in a shock or fire hazard, Periodically examine the
cord, and if its appearance indicated damage or deteriorated insulation, have it replaced by your

service technician.
Protect Power Cords
Route power supply cords so that they are not likely to walked on or pinched by items placed upon
or against them. Pay particular attention to cords where they are attached to plugs and convenience
receptacles, and examine the point where they exit from the product.
Check Ventilation
Slots and openings in the enclosure are provided for ventilation to ensure reliable operation of the
product and to protect it from overheating. Do not block or cover these openings. Never block these
openings by placing the product on a bed, sofa, rug, or other similar surface. Never place this prodct
near or over a radiator or heat register, or any other heat source (including amplifiers). Do not place
this product in a built-in installation, such as a bookcase or equipment rack, unless you provide
proper ventilation.
Do Not Use Accessories
Do not use attachments, unless they are recommended by TurboComm, as they may cause electrical
or fire hazards,
Use the Recommended AC Adaptor
You must use the adaptor that comes with your TurboComm Cable Modem.
Do Not Use Near Water
Do not use this product near water – for example, near a bath tub, wash bowl, kitchen sink or
laundry tub, in a wet basement or near a swimming pool, and the like.
Do Not Place Near High Temperature Source – for example near a steamer, kitchen range fire, and
the like.
Use Caution in Mounting This Product
Do not place this product on an unstable surface or support. The product may fall, causing serious
injury to a child or adult, as well as serious damage to the product.

Use Care in Moving Product and Cart Combinations
Quick stops, excessive, force and uneven surfaces may cause the product and cart combination to
overturn.
Ground the Cable System
Be sure that the outside cable system is grounded, so as to provide some protection against voltage
surges and built-up static charges.
Section 810 of the National Electric Code, ANSI/NFPA No. 70-1984(Section 54 of the Canadian
Electrical Code, Part I) provides information with respect to proper grounding of the cable modem.
Do not disconnect RF cable from your TurboComm Cable Modem while the power to your modem
is on
Use
Unplug Power Before Cleaning
Do not use liquid cleaner or aerosol cleaner. Use a damp cloth for cleaning.
Keep Objects Out of Openings
Never push objects of any kind into this product through openings, as they may touch dangerous
voltage or “short-out” parts, which could result in a fire or electric shock. Never spill liquid on the
product.
Protect From Lightning
For added protection for this product during a lightning storm, or when it is left unattended and
unused for long periods of time, unplug it from the wall outlet, and disconnect the cable system.
This will prevent damage to the product due to lightning and power line surges. Take at least 10
seconds between DC plug off and on.
Service
Do Not Remove Covers
Do not attempt to service this product yourself, as opening or removing covers may expose you to
dangerous voltage or other hazards. Refer all servicing to qualified service personnel.
Unplug this product from the wall outlet carefully, as the AC adaptor may be hot. Refer servicing to
Qualified Service Personnel Under the Conditions Listed Below
When the power supply cord or plug is damaged.

If liquid has been spilled or objects have fallen into the product.
If the product has been exposed to rain or water.
If the product doesn’t operate normally by following the operating instructions. Adjust only
those controls that are covered by the operating instructions.
If the product has been dropped or the cabinet has been damaged.
When the product exhibits a distinct change in performance, such as the inability to perform
basic functions – this indicates a need for service.
Require Safety Check
Upon completion of any service or repairs to this product, ask the service technician to perform
safety checks recommended by TurboComm to determine that the product is in safe operating
condition.
Overview
The modem provides you with high-speed data communications over the television cable network
by following the widely accepted DOCSIS/MCNS standards being developed by the multimedia
cable network system consortium. Those standards offer a combination of high performance and
interoperability among many of the cable system operators in North America.
Working of Cable modem
Digital signals are represented by high and low electrical voltage levels. And how fast these levels
can switch and still be transmitted is determined by the “Bandwidth” of the transmission system.
The pair of wires used in a telephone connection have greatly limited bandwidth, because of their
electrical characteristics. So what we do is connect a device called a modem between the computer
output an the phone line. The modem generates an electrical wave whose strength and phase change
in step with the highs and lows of the computer’s digital output. It’s because of the “smoothness” of
the resultant signal that a higher date rate can be transmitted.
A cable modem Modulates and Demodulates electrical signals in the same sense that the telephone
modem does. However, since coaxial cable can carry much higher wave frequencies, cable modems
are far more sophisticated. Their internals can include a tuner, a bridge, a router, an
encryption/decryption device, an SNMP agent and an Ethernet hub. Furthermore, none of the

activity caused by these circuits and codes disturbs your regular cable TV reception.
Connecting a cable modem to a computer
To connect to Ethernet or USB on a PC running a supported Windows version, we recommend
using the Installation Assistant on the EC420 Installation CD-ROM. Insert the EC420 CD-ROM in
the CD-ROM device, agree to the License Agreement, and the following window is displayed:
To start the Installation Assistant, click Installation Assistant. The procedures it guides you through
are described in the following sections in this guide:
Ethernet
USB
Getting Started
Making sure that you’ve received the following items. If any item is missing or damaged, contact
your dealer immediately.
TurboComm DOCSIS Cable Modem, Model EC420
Ethernet Cable (6 feet)
USB Cable (4 feet)
AC Adaptor (AD-121AN)
This Manual
Basic EC420 Network Requirements
An EC420
A connection to your cable TV system
A subscription to cable modem service from your cable TV provider
One or more computers with minimum:
Pentium-class processor or faster
16Mb of memory
10Mb of hard disk space available
Windows 98, Windows 98SE, Windows Me, Windows 2000, Windows XP, Macintosh, or
Linux with operating system CD-ROM available
A wired network adaptor for each computer on the network
For wired connections, Ethernet cables

THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. OPERATION
IS SUBJECT TO THE FOLLOWING TWO CONDITIONS: (1) THIS DEVICE MAY
NOT CAUSE HARMFUL INTERFERENCE, AND (2) THIS DEVICE MUST
ACCEPT ANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT
MAY CAUSE UNDESIRED OPERATION.
NOTE: THE MANUFACTURER IS NOT RESPONSIBLE FOR ANY RADIO OR TV
INTERFERENCE CAUSED BY UNAUTHORIZED MODIFICATIONS TO THIS
EQUIPMENT. SUCH MODIFICATIONS COULD VOID THE USER'S
AUTHORITY TO OPERATE THE EQUIPMENT.
NOTE: 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 residential installation. 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. However, there is no
guarantee that interference will not occur in a particular installation. If this equipment does cause
harmful interference to radio or 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:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
-Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
-Consult the dealer or an experienced radio/TV technician for help