06-21-2003 12:47 AM - edited 03-13-2019 12:26 AM
HI!
We need make ip -telephony at 100 sites but where exist only DC reliable power .
3521-pwr with inline power for ip-phone would be finest financial solution for us problem but this device doesnot have DC power
Install 4500 with DC and inline too expensive for only 1 phone
Why CIsco could not make device from 3500 series catalyst with DC power for switch and inline power for phone ?
Maybe anyone know alternative Cisco ?
06-21-2003 01:16 PM
If your need is for exactly one phone, then you should choose the best switch for your needs _except_ for your inline power requirement. There are other ways you can supply a single phone.
An inexpensive (about $50 US) AC adapter is available, which could potentially be plugged into a AC-DC converter, depending on the DC voltage you have available. The phones run on 48V DC, so if you have 48V DC available, you may be able to fashion a direct attachment to your DC power source. Obviously, only do this if your DC power source is very clean and stable.
06-22-2003 11:46 AM
How about using a DC-AC inverter? To make it reliable, you can use your DC to charge 12V batteries and then run an inverter to power the 3524s. You will need a 12V charger that runs from whatever your DC supply voltage is, of course, but the whole thing would be fairly inexpensive compared to other alternatives.
06-22-2003 09:42 PM
Thanks to all for answer !
We also thought about it and probably we will looking for acceptable DC-AC converter but in this case we need gather so many certificates which confirm fire safety
because it's oil pipeline object
Thanks again
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