[Asterisk-Users] Dell 2850 w/TDM2400?

[Rich Adamson]

Nick Hoffman wrote:
> On Tue March 28 2006 10:33, "Kevin P. Fleming" <kpfleming at digium.com> 
> wrote:
>> Kerry Garrison wrote:
>>> Does anyone know if a TDM2400 will fit into a Dell 2850?
>> It will fit, but you will need to solve the power supply problem if you
>> intend to use FXS ports on it :-)
> 
> 
> Why is that? Do FXS ports draw large amounts of power? How about FXO ports?

The fxs ports have to generate ringing voltage (about 90 vac) and they 
use the 12 volt power supply to do that. When an fxs port is not 
ringing, it consumes about the same amount of power as an fxo port; not 
much.

The 12 volt power is not available via the pci connector, so the TDM 
cards use one of the disk drive connectors commonly found in most 
chassis.  The majority of 1U and 2U chassis do not have extra disk drive 
power connectors wired in them.

If you're handy with electronics and a soldier gun, you can find and rig 
the 12 volt power required for the cards in those chassis.