On 15 August 2014 07:51, Gord Slater <[email protected]> wrote: > On 15 August 2014 07:48, Gord Slater <[email protected]> wrote: > >>> I am testing some new Cisco ASR901’s and need to find a suitable DC power >>> supply that will power them up in a lab environment. The ASR 901-12C-F-D >>> says that it will accept: >>> >>> >>> >>> 1 GE models: >>> >>> ● DC-input voltage rating: 24 VDC, -48 VDC, -60 VDC > > hmm: does it need all 3 rails at the same time? I may have misread that ^ >
from the Cisco datasheet - clear as mud: "Power Supply The Cisco ASR 901 router is equipped with an internal -24/-60 volts Direct Current (VDC). Note The grounding architecture of this product is DC-isolated (DC-I) for DC-powered products. DC-powered products have a nominal operating DC voltage of 48 VDC. Minimal steady state DC operating voltage is 19.2 VDC" That seems to suggest (to me at least) that feeding it 24 volts or more (19.2V absolute minimum under battery droop) will make it work, because it's galvanically isolated from terra. It also seems to have 3 DC power inputs, banded for various input ranges onto different connectors. I think. Maybe I could be very wrong at this though, but if my assumption reading between the lines above is correct, you simply need a 24V PSU,connecting it positive-to-0V to give 0-to-24V. -- sent via Gmail web interface, so please excuse my gross neglect of Netiquette
