Greetings ( + )!( + )
On Jul 9, 2005, at 8:09 AM, Bruce Johnson wrote:
On Jul 9, 2005, at 5:40 AM, Andrew Grebneff wrote:
And I have been using extension leads ever since first getting onto
e-mail, and have NEVER had a problem with it... my opinion is that
ISPs just like to try to blame their faults on other things!
There's a real simple way to test this. Temporarily move the B&W close
enough to use just a single cord directly into the wall jack. If it
doesn't connect then, it's either the ISP or your modem.
If the 6116 can dial in, it isn't the ISP.
--
Bruce Johnson
This is the sig that says 'NI!'
Not true: Different modems (Modulate Demodulate) devices can and will
have different transmit and receive levels. So just because one modem
can connect to another doesn't mean the the next one will.
Tx and Rx Levels
The Tx level is the power in decibels per milliwatt (dBm) at which a
modem transmits its signal. The Rx level is the power in dBm of the
received signal. The server modems normally transmit at -13 dBm by
default. Ideally, the Rx level should be in the range of -18 to -25
dBm. If the Rx level is under -25 dBm, the Signal-to-Noise Ratio (SNR)
is likely to decrease, meaning that the speed also decreases. If the Rx
level is too high, you may see signal distortion or the receiver's
Digital Signal Processor (DSP) being overdriven, and erratic
connections are possible.
In some modulation standards, such as V.34, a receiver can tell its
peer that the signal level is too high and the transmitter then reduces
the level at which it transmits. (If this behavior is widespread, try
configuring the transmitter to transmit at a lower level.) Modems that
use other modulation standards (such as K56 Flex) may not be able to do
this, resulting in problems.
Therefore, an effective Rx level is a function of the peer's initial Tx
level, the negotiated dBm reduction (if any), and the attenuation in
the voice circuit. The voice circuit attenuation is, in turn, a
function of link attenuation and of analog or digital pads, which are
telephone company circuitry designed to insert attenuation into the
voice circuits.
If you need to reduce or increase your Tx level, this is attainable
with the following modems and modulation standards:
To see if you can change the levels in you modem see from cisco:
http://www.cisco.com/en/US/tech/tk801/tk36/
technologies_tech_note09186a00800942b1.shtml
Best Regards, /\*_*/\
Harry (*^_^*)
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