[olug] mystifying cable modem problem

[Craig Wolf]

Ok, I have: Downstream
Signal to Noise: 35dB
Power Level: -8dBmV
Upstream:
Power level: 49dBmV
Symbol Rate: 2.560 Msym/s

Hope that helps as a reference...

Craig Wolf
Linux Web Server Support
Desktop/Network Specialist
402-894-6283

>>> epenne at olug.org 08/31/04 11:50 AM >>>
-13dB really doesn't mean anything.  -13dBW is about 100 milliWatts. 
Many wireless cards put out 50 - 100mW and you can still get on the 
network for a long ways.  Imagine how far 100mW can go down a coax
cable.

-13dBm is about 0.1mW.  I'm not sure but I believe this is plenty of
power.

Eric Penne

Eric Pierce wrote:
> Exactly.  However, I'll try Ethereal out tonight.  It's good to try
out new
> shit.
> 
> I tried Jay's suggestions (to have Cox remove and re-add my modem),
but that
> didn't work, and I tried resetting/standby/etc. the modem, but that
didn't work
> either.  I went to a popular electronics store and am currently
"leasing" a
> Motorola SB 5100 modem.  I had it provisioned by Cox, and I got right
on the
> network...  I could finally access the modem at 192.168.100.1, and I
noticed
> that the signal level was -13 Db.  Seems kinda low.
> 
> The Toshiba modem I have has a 5 year warranty, so I'm going hit them
up on
> that.
> 
> In the meantime, if anyone has an extra modem laying around for a
decent price,
> I'm interested.
> 
> Thanks,
> Eric
> 
> 
> --- Terry <td3201 at gmail.com> wrote:
> 
> 
>>I think that if he would know how to do all that, he wouldn't be
>>asking what ethereal is.  :)
>>
>>
>>On Mon, 30 Aug 2004 22:18:07 -0500, Dave Hull <dphull at insipid.com>
wrote:
>>
>>>Quoting Bill Brush <bbrush at unlnotes.unl.edu>:
>>>
>>>
>>>>1.  A 10base-T network can be switched also.
>>>>
>>>>2.  A 100base-T network can be run on a hub.
>>>>
>>>>3.  Even if the network is switch you can use a promiscuous port to
see
>>>>everything (on a managed switch).
>>>>
>>>>4.  On an unmanaged switch you can use certain tools to do Arp
poisoning
>>
>>so
>>
>>>>your monitoring station can act as the man in the middle.
>>>
>>>>From what I hear, some switches "fail open" or revert to a hub like
mode
>>
>>if they
>>
>>>are overwhelmed (buffer overrun?) or otherwise compromised. If you
can make
>>
>>that
>>
>>>happen on the network in question, you can see pretty much
everything.
>>>
>>>--
>>>Dave Hull
>>>http://insipid.com
>>>
>>>
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>>
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> 
> 
> 
> 
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