What is ADSL?
ADSL provides high speed video and data communications to residences
and businesses over standard telephone lines. ADSL service is provided
by connecting a pair of very high speed modems to each end of the phone
line; one in the central office (ATU-C), and the other at the customer's
premises (ATU-R).
Because ADSL is asymmetric, there is a measurable difference in the
bit rate between the upstream (how fast you can send data) and downstream
(how fast you can receive data) transmissions.
The 3Com ADSL Modem USB utilizes full rate, G.dmt, or lite, G.lite,
ADSL. The speed and type of DSL your modem uses, will be determined by
the type of service you have ordered from your DSL provider.
A typical ADSL installation will require either a POTS (Plain Old Telephone
Service) Splitter or Micro filters to be used for your analog voice service.
The use of these devices enables simultaneous usage of normal telephone
service and the modem, with no interruption to the normal telephone service.
Your DSL provider will normally supply you with a Splitter or Micro filters
and explain their usage.
Ordering ADSL Service
The ADSL Modem USB has a 2-wire twisted pair standard telephone interface
which can be used with an ADSL connection from your telephone company
or other service provider. The service to order depends upon the services
that will be configured and enabled for the modem.
This modem supports full rate ADSL. This means that a POTS (Plain Old
Telephone Service) Splitter must be installed in order to be able to use
regular phone service at the same time as you are using your modem.
What's included in the package?
Please check that the following components were included in your package
before using the ADSL Modem.
- 6 ft. of RJ-11 telephone cable, for the ADSL interface
- ADSL Modem USB CD-ROM containing
- ADSL Modem USB Drivers
- ADSL Modem USB Quick View and Control Center
- Configuration Files
- Installation Scripts
- Help Files
- Other cables as appropriate for your type of modem
(e.g., USB modems should also include a USB cable).
- ADSL Modem USB unit
If anything is missing,
contact 3Com Customer Support.
What to ask your service provider
The install is set up so that during the installation, you can choose
your Service Provider from a list. This will configure all of the information
necessary to establish your DSL connection. Shortcuts will be created
which can be used to dial in to your Service Provider, where all you will
need to enter is your user name and password.
If your Service Provider is not in the list during the install, you will
choose Custom from the list, and you will need to know:
- VPI - The Virtual Path Identifier is used for the physical DSL connection.
- VCI - The Virtual Channel Identifier is used for the physical DSL
connection.
- The access method for their service. Either Bridged RFC1483, Routed
RFC1483, PPP over Ethernet (same as Bridged RFC1483) or PPP over ATM
(either LLC or VC MUX mode).
- User Name - The is the name your Service Provider has assigned to
you for your connection. May be optional.
- Password - The password your Service Provider has assigned to you
for your connection. May be optional.
- There may be other information necessary so you can establish a network
connection.
Check with your Service Provider to obtain the necessary information.
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