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russell_w_b · 28th Dec 2017, 7:02 pm

The BT SIN351 doesn't give an 'off-hook' voltage but gives the following useful data: 'The d.c. current provided at the customer side of the NTP will be up to 42 mA at 12.5 V, up to 33.5 mA at 10 V, and will be not less than 25 mA at 9 V.'

So with a lower off-hook voltage than 9V you're pushing it a bit.

28th Dec 2017, 7:02 pm	#44
russell_w_b Dekatron Join Date: Jul 2007 Location: Penrith, Cumbria, UK. Posts: 3,687	Re: GEC 1000 phone not working properly? The BT SIN351 doesn't give an 'off-hook' voltage but gives the following useful data: 'The d.c. current provided at the customer side of the NTP will be up to 42 mA at 12.5 V, up to 33.5 mA at 10 V, and will be not less than 25 mA at 9 V.' So with a lower off-hook voltage than 9V you're pushing it a bit. __________________ Regds, Russell W. B. G4YLI.