[VoIP] Numbering - cost of power

[Steph Kerman]

Electromechanical switches often consume very little or actually no 
power at all at 48V when idle.  Any continuous power consumption is 
usually the standby loss in the 120VAC to 48V DC power conversion . If 
you find an efficient switcher, that can be very low too. 

Avoid ferro-resonant supplies, which are expensive to idle.   Besides 
the acoustic noise, even a linear supply can be more efficient because 
if the load duty cycle is low, as it usually is in a hobby exchange, the 
power loss from heat dissipation in the linear regulation can be more 
than compensated by low standby consumption.  Of course if there were 
heavy traffic, quite the opposite would be true.  But keeping a line 
frequency transformer powered is likely to cost more than keeping a 
switcher powered.

Steph

Mark Rudholm wrote:
> Plus, I pay up to 27 cents per kWh, so I'm averse to any significant constant electrical loads.
>
> Hmm, what's the smallest, not necessarily vintage, real switch that could provide DTF coin service and wouldn't eat a lot of electricity?
>