In article , snipped-for-privacy@rmi.net (Reed) writes: | Dan Lanciani wrote: | > In article , msg@_cybertheque.org_ (msg) writes: | > | Dan Lanciani wrote: | > | | > | > Has anyone had any experience with this? I recently bought one and | > | > connected a 2500 set. Polarity was wrong but I guess nobody worries | > | > about that anymore. Ring test actually made the bell sound which | > | > seemed encouraging. Unfortunately, while it worked for outgoing calls | > | > it seemed to lose its association with my cell phone when an incoming | > | > call arrived. It turned out that what was actually happening was that | > | > the Cell2Tel was trying to ring the 2500 set and crashing/rebooting in | > | > the attempt. If I disconnect the ringer I can answer blind just fine. | > | > | > | > I retried the original ring test and it no longer works; the device | > | > again crashes in the attempt. I conclude that the ring voltage | > | > generator can't deal with a real load and/or was damaged. When | > | > it tries to drive the bell it loads the power supply and causes | > | > the cpu to reset. (I tried a different wall wart in case it was | > | > that simple but no luck.) Customer support isn't very helpful, | > | > not responding as to whether they have ever tested with a real | > | > mechanical ringer. I can send the unit in for them to "look at" | > | > but I have a feeling it might just be a waste of postage (not | > | > to mention making it impossible to return to the place of purchase). | > | > | > | > Dan Lanciani | > | > ddl@danlan.*com | > | | > | FWIW, I tried ringing a 500 set on a Linksys PAP2; it doesn't ring | > | but at least the ATA didn't crash ;) | > | | > | Surprisingly, there doesn't seem to be ringer equiv. data for a lot | > | of these accessories. | > | > Indeed, even the FXS ports on my Cisco (I've tried NM-HDA, VIC-4FXS/DID, | > and VIC2-2FXS) will not ring a 2500 set. I think the main problem is that | > the lowest supported ring frequency is 25Hz--at least on 3600 series routers. | > An SPA-3000, on the other hand, did work after I lowered the frequency to | > 20Hz from the 25Hz default. (Raising the voltage also worked though less | > well.) I wonder why 25Hz is so common. | > | > Dan Lanciani | > ddl@danlan.*com | I wonder if a 2500 needs more *voltage* than ATAs, routers, etc can | provide ??
At 25Hz the sample I was using needed ~120v to ring, so in a sense, yes. At 20Hz the phone is happy with ~80v.
Dan Lanciani ddl@danlan.*com