Mount external modem inside PC? Power from PSU?

[kony]

By nothing like as much that stupid claim you made
about 250mA you just plucked out of your arse.

Not quite, while I was ignoring any losses from an onboard
linear regulation stage, it is exceedingly rare for any
modem modern enough to be worth using today (the old speed
issue) to use much power. Take for example a very common
older modem, there's nothing in it that consumes much power.


http://69.36.189.159/usr_1034/USR_Sportster_56K_Ext.jpg

IIRC, these had 12V then later 9V AC @ 1A, and while the
case might get warm after it had sat around for awhile, this
is merely due to having only the minimal (as needed) passive
cooling, there aren't even any parts 'sunk to the board
copper with the exception of the LM2940-5.0, 5V linear LDO
regulator which itself has a 1A max rating...

12VAC in, approx 17VDC after rectified, and dropped to 5V.
Shedding 12V in itself is the far largest consumer of power
in this modem, and yet it couldn't possibly be using 1A,
because it IS IMPOSSIBLE to run one long term producing 12W
of heat the way it's set up.

It's quite possible the OP's modem is not designed quite the
same, but it's likely it is similar enough except that IF
that 9V it uses is DC, there is even less loss in the modem,
it is an even lower power consumer than the example I
provided.

We can reasonably expect the unknown modem is either using
significantly less than 1A, probably half that or less, or
that it's not a consumer modem and would've had a larger
PSU. There may be an exception, but find one... I already
provided what is likely, show one that is unlikely but still
possible. I'm not saying there isn't one, only that for
your argument to be reasonable, you would have to know of
such a best at that power consumption level and with only 1A
supply.

It wont be anything like that stupid claim you made
about 250mA you just plucked out of your arse.

Do feel free to pick a number you like better. Until we
have specifics of the model, a schematic, or an actual
measurement, we can only ballpark and generalize from the
info available.

Stupid to not just replace it with an adequate wall wart.

You keep forgetting the thread topic... see the title.
With it internal, powering it from the system PSU can make
as much sense as stringing the external wart cord from
outside to inside the case.

 

[Rod Speed]

Not quite,

Fraid so.

while I was ignoring any losses from an onboard linear regulation
stage, it is exceedingly rare for any modem modern enough to
be worth using today (the old speed issue) to use much power.

You dont even know that HIS modem is one of those.

Take for example a very common older modem,
there's nothing in it that consumes much power.

Have fun explaining how come the USR Courier HST has a 800mA plug pack.

http://69.36.189.159/usr_1034/USR_Sportster_56K_Ext.jpg

IIRC, these had 12V then later 9V AC @ 1A,

So much for that stupid claim you made about
250mA you just plucked out of your arse.

and while the case might get warm after it had sat around for
awhile, this is merely due to having only the minimal (as needed)
passive cooling, there aren't even any parts 'sunk to the board
copper with the exception of the LM2940-5.0, 5V linear LDO
regulator which itself has a 1A max rating...

Irrelevant to that that stupid claim you made
about 250mA you just plucked out of your arse.

12VAC in, approx 17VDC after rectified, and dropped
to 5V. Shedding 12V in itself is the far largest consumer
of power in this modem, and yet it couldn't possibly be
using 1A, because it IS IMPOSSIBLE to run one long
term producing 12W of heat the way it's set up.

Irrelevant to that that stupid claim you made
about 250mA you just plucked out of your arse.

It's quite possible the OP's modem is not designed quite the
same, but it's likely it is similar enough except that IF that 9V
it uses is DC, there is even less loss in the modem, it is an
even lower power consumer than the example I provided.

Irrelevant to that that stupid claim you made
about 250mA you just plucked out of your arse.

We can reasonably expect the unknown modem is either
using significantly less than 1A, probably half that or less,

Very bloody unlikely that anyone would actually be stupid
enough to supply a 1A wall wart with one of those.

or that it's not a consumer modem and would've had a larger PSU.

Plenty of consumer modems had 1A wall warts, and needed them too.

There may be an exception, but find one...

You found one yourself.

I already provided what is likely,

No you didnt. You just plucked more stuff from your arse, as always.

show one that is unlikely but still possible. I'm not saying
there isn't one, only that for your argument to be reasonable,
you would have to know of such a best at that power
consumption level and with only 1A supply.

Never ever could bullshit its way out of a wet paper bag.

Do feel free to pick a number you like better.

The 1A the wall wart is rated at will do fine thanks.

Until we have specifics of the model, a schematic, or an actual
measurement, we can only ballpark and generalize from the info available.

Or we can have enough of a clue to be able to grasp that its
very unlikely indeed that the modem was supplied with a wall
wart of 1A if it didnt need something of that order current wise.

You keep forgetting the thread topic...
Nope.

see the title.

Go and **** yourself.

With it internal, powering it from the system PSU can make as much
sense as stringing the external wart cord from outside to inside the case.

Only a fool would mount an external modem inside a PC.

You qualify.

 

[kony]

Have fun explaining how come the USR Courier HST has a 800mA plug pack.

Because they found a supplier that would sell them for
slightly less... 800mA is not so common a quantity and these
are commodity items in general, nothing at all special about
the supplies they use.

So much for that stupid claim you made about
250mA you just plucked out of your arse.

Err, no, that was the supply rating for the modem which
obviuosly had to use substantially less to be able to run as
designed.

Plenty of consumer modems had 1A wall warts, and needed them too.


You found one yourself.

Reread what was written. It had 1A supply but couldn't
possibly have used near 1A.

 

[Rod Speed]

Because they found a supplier that would sell them for slightly less...
800mA is not so common a quantity and these are commodity items
in general, nothing at all special about the supplies they use.

Irrelevant to that stupid claim about there not
being much in that modem that uses much power.

There clearly is enough for USR to supply an 800mA wall wart with it.

Err, no,

Fraid so.

that was the supply rating for the modem which obviuosly
had to use substantially less to be able to run as designed.

Nothing like that stupid claim you made about
250mA you just plucked out of your arse.

Reread what was written.

No point, it remains stupid shit no matter how often its reread.

It had 1A supply but couldn't possibly have used near 1A.

Have fun explaining the 800mA wall wart supplied with the Courier HSTs.

VERY unlikely indeed that it didnt need the bulk of that.

 

[Noozer]

If I have an external phone modem that uses a 1amp 9vDC tranformer, could
I power this from the 12v line of my PC PSU? (assuming that the modem will
run on 12v)

Just trying to eliminate all the power cords, etc. and get the modem out of
the way.

 

[Noozer]

Just trying to eliminate all the power cords, etc. and get the modem out
of the way.

....and all moot as I found a decent PCI modem for my Linux box at a
reasonable price.