U.S.Robotics 56K Faxmodem USB Instructions D'installation page 10

PROBLEM: My modem sounds like it's trying to connect to another modem
but fails.
Possible solution:
You may have a poor connection. All calls are routed differently, so try placing the call
again.
PROBLEM: My modem drops the ISP connection when I accept incoming
calls.
Possible solution:
If you are connecting to a server that does not support V.92, you will receive a message
informing you of an incoming call. You will then have the option to accept the call or to
ignore it. If you choose to accept the call, your data connection will be terminated.
PROBLEM: My modem isn't achieving a 56K Internet connection.
Possible Solution:
The V.90/V.92 protocol allows for download speeds of up to 56K, but line conditions may
affect the actual speeds during a given connection. Due to unusual telephone line
configurations, some users will not be able to take full advantage of V.90/V.92 technology
at this time. In order to achieve a 56K connection:
•
The server you're dialling in to must support and provide a digital V.90/V.92
signal. Your ISP can provide you with a list of dial-up connections and
information on what those connections currently support.
•
The telephone line between your ISP and your modem must be capable of
supporting a 56K connection and contain only one analogue-to-digital
conversion. The 56K signal from your ISP begins as a digital signal. Somewhere
between the ISP and your modem, there will be a digital-to-analogue signal
conversion so that your modem can receive the data. There must be no more
than one analogue-to-digital signal conversion in the path from your ISP to your
modem. If more than one analogue-to-digital conversion occurs, your connect
speeds will default to V.34 (33.6 Kbps). There may also be impairments on the
local lines between your ISP and your modem. These impairments can prevent
or limit V.90/V.92 connection speeds. All telephone calls are routed differently, so
you should try making your 56K connection several times. One way to test this is
to dial into a long distance location. Long distance lines are often much clearer
than local lines. It is important to note that telephone companies are constantly
upgrading their systems. Lines that do not support 56K today may support 56K in
the near future.
•
Your modem must be connecting to a V.90/V.92 server. A pair of 56K modems
will not connect to each other at 56K speeds.
PROBLEM: My modem isn't achieving the promised faster connections.
Possible Solution:
In order to achieve a V.92 connection:
• The server you're dialing in to must support and provide a digital V.92 signal. Your ISP
can provide you with a list of dial-up connections and information on what those
connections currently support.
• The telephone line between your ISP and your modem must be capable of supporting a
56K connection and contain only one analog-to-digital conversion.
• Your modem must be connecting to a V.92 server. A pair of 56K modems will connect to
each other at V.34 speeds (33.6K).
The V.92 standard is an advancement in 56K technology. V.92 offers three functions to
enhance the current V.90 standard.
• The first enhancement is the "V.PCM-Upstream" technology, which allows a modem's
upstream communication to reach speeds of 48,000 bps.
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