Re: Impact of hardware with bad SNR & Attenuation

Michael Chare wrote:
> "Mark Rogers" <mark-news@xxxxxxxxxxxxxx> wrote in message
> news:3nlgo5F21c4aU1@xxxxxxxxxxxxxxxxx
>> I'm struggling to find comprehensive (or at least convincingly
>> accurate) information on what I'm sure must be a FAQ:
>>
>> - What are the "good" values for SNR/attenuation for
>> different line speeds, and more importantly:
>> - what are the symptoms of borderline low SNR?
>
> When I had 9-14db downstream noise margin I found that the line kept
> dropping particulary about 9-10pm - most popular time for internet
> use!
>
> with 22-23db noise margin my line is completely stable. (512k line
> about 60db attentuation, only connected when BT disontinued the line
> loss limit last Sept).)
>
>
>> - what are the symptoms of borderline high
>> attenuation?
>> - what (in each case) if the upstream figures
>> are good and downstream bad?
>> - Vice versa?
>>
>> - Regarding CRC errors:
>> - what causes them?
>> - what is a "good reading? (Obviously 0 is good
>> but at what figure should I worry about them?)
>> - what impact do they have?
>>
>> - What impact does hardware play in making up for
>> borderline figures? Eg:
>> - having a crap filter?
>> - having crap cable?
>> - having a crap modem?
>> - having too much or crap telephone equipment
>> hung on the same telephone line?
>
> I obtained a stable connection my connecting my router to the master
> socket and connecting all the household wiring and extensions via a
> filter.
>
>
>>
>> - What does environmental conditions (eg weather)
>> affect:
>> - the SNR and attenuation readings?
>
> Trees falling on local overhead phone lines have spoilt my
> connection! I have lost a 56K modem to lightning.
>
> If you can not get a stable connection by the above self help measure
> (i.e. if the connection fails more than 1 per week.) I would
> suggest complaining to your ISP, and asking them to get BT to
> investigate.

Make sure that it's not your hardware first or else it may cost you when
you start to get BT involved (i.e borrow another modem/router, well it's
cheaper than buying). Many (if not all) the budget routers have
foibles, some which can be cured by upgrading the firmware & some not.

Speaking from experience here, which is why I have 5 different makes on
the shelf at this end, well I knew it wasn't my line so it had to be the
hardware. Even the Draytek 2600g isn't 100% (for some reason if another
machine on the network gets turned on it can force a reboot on the
router, not always but sometimes so I can life with it as it is back on
line within 90 seconds or there abouts & most apps can survive that
without detecting a loss of connection).


.

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