Physical FXS to FXO Relay - Not functional in OBi110 Hardware ver 3.4
pedro:
I wrote Obihai support a few days ago asking for clarification on this matter. The following is their response.
"Thank you for contacting the Obihai Support Team.
Your second OBi device is working properly."
Thanks a lot Obihai support. That really clears things up for me. ::)
stooba:
I have the same issue and have posted in another forum asking someone who has an older unit to send pictures so we can see what is missing in the new builds.
The components that I'd like to identify are:
K1 - a relay (DPDT)
Q206 - a transistor (likely a MOSFET of some sort to activate relay coil)
C99 - capacitor (likely power conditioning for relay coil)
D150 & D151 - diodes (polarity of PHONE/LINE Ring and Tip lines)
D203 or D204 - diodes (for back EMF on relay coil)
Since the relay is missing, Resistors R38 and R39 are added as jumpers that connect the COM and NO pins to look as if the relay was present and activated all the time.
Here is a link to the pictures of my current build's PCB where you can clearly see the missing pieces.
https://skydrive.live.com/redir.aspx?cid=e09e9b91a0c8f298&resid=E09E9B91A0C8F298!129&parid=E09E9B91A0C8F298!104&authkey=!AO953AL5VowTwN0
While many people might not care, this is a serious issue for those of us who bought this product specifically for that feature because we live in rural areas where power outages are a common issue.
Ostracus:
Quote from: stooba on April 13, 2012, 08:12:32 pm
While many people might not care, this is a serious issue for those of us who bought this product specifically for that feature because we live in rural areas where power outages are a common issue.
And on that note, are there any good compact UPSs that'll run devices like these for a long time?
stooba:
Once I get mine up and running an ip-Phone and an analog phone over both the PSTN and GV networks, I'll do some current consumption testing for all operating modes. I'll post the results so that everyone can estimate how much time their devices will work in each mode, and determine how much backup capacity they really need. Probably be a few weeks before i can get all that running though, so if anyone wants to beat me to it, be my guest.
pedro:
Quote from: Ostracus on April 14, 2012, 08:40:14 am
Quote from: stooba on April 13, 2012, 08:12:32 pm
While many people might not care, this is a serious issue for those of us who bought this product specifically for that feature because we live in rural areas where power outages are a common issue.
And on that note, are there any good compact UPSs that'll run devices like these for a long time?
Don't forget you'll need to power your router, switch, cable modem/dsl modem etc. I have a APC Back-Ups 550VA connected to my network stack consisting of a Linksys wireless router, Linksys cable modem, and two OBi110 devices. My UPS with semi-new batteries fully charged will run my network stack for about 4 hours. Don't forget to connect an analog telephone or be sure to have battery power for your cordless handset base station as well. Please note, newer OBi110 units lack the failsafe relay to connect the FXS to the FXO port so unless you power your newer OBi110 you'll be without telephone service when you need it most. Shame on you Obihai.
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