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VonageTPA
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PostPosted: Wed Mar 15, 2006 3:04 pm    Post subject: TI-chipset device versions? Reply with quote Back to top

Hi all,
Just wondering if anyone knows what the different hardware versions/revisions (not firmware) of these devices are. I'm hitting an interesting problem where certain telephones cause some of the TI chipset devices to produce very noisy connections. The most/more recent RTP300s seem to be fine with this equipment, while the older ones (and older WRTP54G) don't.

Here's where things get really interesting... All I have to do is go off-hook with the telephone and the older RTP300s will get noisy. Unplug the telephone completely from the line and the RTP300 STILL remains noisy. This started around firmware version 1.00.5x with the old devices and still happens when they have 1.00.60 on them. My newer devices are running 1.00.60 as well, but they don't exhibit the problem.

The only difference that I've seen is that the older devices came with the 1.0A 12vDC switching power supply, whereas the new ones come with the heavy iron-core brick 1.2A transformer. I've tried swapping transformers, but that doesn't seem to make a difference, so there must be some sort of hardware difference in the RTP/WRTP itself.

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sinceMay2004
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PostPosted: Wed Mar 15, 2006 6:38 pm    Post subject: Re: TI-chipset device versions? Reply with quote Back to top

VonageTPA wrote:

... All I have to do is go off-hook with the telephone and the older RTP300s will get noisy. Unplug the telephone completely from the line and the RTP300 STILL remains noisy...

Is this more than one unit?
What does it take for the unit to quiet down?
Is there any call degradation?
I'm wondering if the signal generator circuit(coil or something, capacitors remain charged until discharged) for the dial tone is being over taxed? Lack of input current from the power supply would be a good thought, but it seems there would be other functional problems with the unit if that were the case. I'm also not sure if the disconnecting of the tele line is the same as an on-hook to the device. It breaks the circuit, so it should be designed to stop the signal via grounding. It's possibly related to the grounding prob a year or so ago when people came up with the fix(I'm not suggesting this) of grounding out the 2nd phone connection on the box. You could try taking the unit apart to see the hmm origin(again, not recommending it). They might have made a hardware change like a bigger capacitor in the newer units.

To answer your question, sorry, I dun't kno nuttin about versions Confused And very little about anything else Embarassed I don't know whether to post this or not? Rolling Eyes What the ..., its a forum Wink

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VonageTPA
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PostPosted: Thu Mar 16, 2006 4:24 am    Post subject: Re: TI-chipset device versions? Reply with quote Back to top

sinceMay2004 wrote:

Is this more than one unit?
What does it take for the unit to quiet down?
Is there any call degradation?


Yep, I've had it happen with 3 different TI-based devices (the Sipuras don't seem to care / are noisy already). The only way to quiet the unit down is to end the call. As far as call degradation goes, the white noise that the adapter generates is pretty loud, enough to interfere with conversations.

Quote:
I'm wondering if the signal generator circuit(coil or something, capacitors remain charged until discharged) for the dial tone is being over taxed? Lack of input current from the power supply would be a good thought, but it seems there would be other functional problems with the unit if that were the case. I'm also not sure if the disconnecting of the tele line is the same as an on-hook to the device. It breaks the circuit, so it should be designed to stop the signal via grounding. It's possibly related to the grounding prob a year or so ago when people came up with the fix(I'm not suggesting this) of grounding out the 2nd phone connection on the box. You could try taking the unit apart to see the hmm origin(again, not recommending it). They might have made a hardware change like a bigger capacitor in the newer units.


Good theories, but here's where things go wrong: Let's say I have 2 phones connected with a Y-adapter into the RTP300, with one of them being an average run-of-the-mill corded phone and the second one being one of the fancy phones in question. Let's say I dial the number on the cheaper phone and listen in with the fancy one. There'll be noise from the dial tone all throughout the call. If I unplug the fancy phone from the connection and leave the cheaper phone connected, the noise persists. If I hang up and call back with the cheap phone, the noise is gone. Likewise, if I have both phones connected and the fancy phone isn't in use, no noise either. Adding to the mystery is that this only started after one of the 1.00.5x firmware versions (and persists in the 1.00.60 versions). I'm going to call up the manufacturer of the fancy phone tomorrow and see if some of the phone's probing of the phone line when it calibrates for each call happens to be what is ticking off the RTP.

To answer your question, sorry, I dun't kno nuttin about versions Confused And very little about anything else Embarassed I don't know whether to post this or not? Rolling Eyes What the ..., its a forum Wink[/quote]

_________________
ISP: Varies depending where I'm at.
Vonage: Linksys RTP300
Router: IPCop 1.4.10
Phones: various
Total calls since Jul 24, 2005: 4,794 calls
Total Minutes since Jul 24, 2005: 25,552 minutes
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