[asterisk-users] Electric usage of a tdm400p

[Mojo with Horan & Company, LLC]

Further, I should have mentioned my resolution.  As Bob mentioned, 
upgrade the power supply now to give you options and peace of mind in 
the future.  I am using a picoPSU-120 in the aforementioned itx box, for 
example,

http://www.mini-box.com/s.nl/it.A/id.417/.f?category=13

and have been quite happy with it :)

Moj


Bob Chiodini wrote:
> Erick,
> 
> It looks like the 2.5" laptop drive requires 5 watts to spin up. Adding
> that to the 15 watts for the Digium card, leaves about 40 watts
> available for the MB.  It's unlikely that the system will be producing
> ring voltages when the drive is spinning up.  It depends on how
> conservative you may be with real-time power management, e.g. spinning
> drives down when not in use, etc.
> 
> I did not easily find too many ITX MB power requirements, but the one I
> did find, required 45 watts (peak).
> 
> In the worst case, ringing 5 RENs on each Digium port and spinning up
> the disk, you would be overtaxing the power supply.  I doubt you will
> have 5 RENs on each port and all ringing, but you could.
> 
> In ages past, hard drives were the most vulnerable to poor power
> regulation, but that may have changed.  With the higher cost of 2.5"
> drives, I would not take any chances.  Beefing up the power supply would
> also eliminate the need for manually managing power should you need a
> CDROM or more power hungry drive in the future.  It's also one less
> concern when troubleshooting the system.  
> 
> As Moj has pointed out, problems can occur when working close to the
> edge.  I, too, have experienced similar problems when power was limited
> and have had to, temporarily, resort to a "bigger" power supply to get a
> system installed.  Then fell back to a "smaller" one in operation.
> 
> Good luck.
> 
> Bob...
> 
> On Wed, 2006-10-18 at 08:49 -0800, Mojo with Horan & Company, LLC wrote:
>> I set up a similar system on an VIA Epia 5000, and I had issues when I 
>> included the CDROM in the mix.  I had to use another ATX power supply to 
>> complete the install, but then once I removed the CDROM drive I had no 
>> power issues.
>>
>> I presume you could install the OS with the CDROM drive installed and 
>> the molex power connector REMOVED from the TDM card, then when the OS 
>> was installed and you had network connectivity, power down, remove the 
>> CDROM, add the power supply for the TDM card, then install zaptel etc.
>>
>> Or just try it and tell us what happens, low power won't break it in my 
>> experience.  Your cdrom drive might have a lower power consumption than 
>> mine.
>>
>> Moj
>>
>> Erick Perez wrote:
>>> Well Im planning to use a mini-itx, a laptop hdd and a 4fxs digium card.
>>> the mini-itx comes with a 60W DC to DC adapter (80W peak).
>>> So I need power to manage the hdd, motherboard,the tdm card.
>>> A disk cable can be made available, but is not present as a factory default.
>>>
>>> So My real concern is power.
>>>
>>>
>>> On 10/18/06, Bob Chiodini <bchiodini at gmail.com> wrote:
>>>> On Tue, 2006-10-17 at 11:59 -0500, Erick Perez wrote:
>>>>> Hi people,
>>>>> When you use a TDM400p with 4FXS i know i need to connect a 12V
>>>>> connector to power the FXS lines.
>>>>> Im not good at electric stuff so I ask...If I have a 60W DC to DC
>>>>> adapter (80W peak) then, how much power will the TDM 400P consume? can
>>>>> it be powered?
>>>>>
>>>>>
>>>> Erick,
>>>>
>>>> Per http://en.wikipedia.org/wiki/Ring_(telephone) in the US the ring
>>>> voltage is around 90VAC (20 Hz) with a current of 30 milliamperes (REN
>>>> ~5).  This translates to 2.7 watts.  Assuming a DC/DC converter
>>>> efficiency of 38% (probably low), you would need about 3.7 watts, per
>>>> FXS module.  About 15 watts, total.
>>>>
>>>> What is the TDM card installed in and is a disk drive cable available?
>>>>
>>>> Bob...
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-- 
Mojo <mojo at horanappraisals.com>
Office Manager, Horan & Company, LLC
(907) 747-6666 x112