Echo with OBI202 using pstn USB dongle
HDFLucky:
Quote from: ProfTech on October 20, 2014, 08:40:26 am
Which gain(s) did you turn down and what settings did you end up at?
... Just got an Obi 200 and would like to know.
Assuming the menu settings are the same in the OBi200 (this thread is about OBi202), see my previous post in this other thread: http://www.obitalk.com/forum/index.php?topic=8402.0
Note that the numbers are logarithmic, not linear; if -3 isn't enough, try -6. Also, make sure you are not testing with a phone in the same room.
ProfTech:
The other post(s) you reference do not mention use with a PSTN dongle at all. The echo situations I've read about [and experienced with Linksys] specifically relate to PSTN usage. I run a Obi 110 and as Sophia and others indicated the 110 does not experience it. Haven't seen even one post from an Obi 200 or 202 [they run the same firmware] user using the dongle. I don't really want to spend $35 to test it. :(
HDFLucky:
Dongle or not, there are only a limited number of causes for echo:
1. Infrastructure problem - Infrastructure problems include things like wiring defective echo cancelers on the public network, and excessive network latency. There's not much you can do about any of these unless it's a local-loop wiring problem or latency introduced locally.
2. Tx and/or Rx gain set too hot - The solution to gain issues is obvious.
3. Shared IRQ - Not applicable in situations that don't involve the signal path traversing a computer link.
I suppose it's possible that the adapter has an inherent design flaw that introduces echo, but I find that hard to believe. That said, perhaps this posting on Amazon will be helpful: http://www.amazon.com/review/R2Z07KJVGJVAXE/ref=cm_cr_pr_viewpnt#R2Z07KJVGJVAXE
agarciat:
Impedances should help according to other post i have read. For that, the best it to take it from the following website as it dependnd on the country where the obi is located . http://www.3amsystems.com/World_Tone_Database/Compliance_data
At the moment i have reduce the gain but still with a bit of echo with a ChannelTxGain" -4 ChannelRxGain"-3 (from -2 and -1 factory settings)
mrjoe:
I experienced echo issues as well as the Disconnect tone not being sent through to the PSTN line.
I'm now back with my trusty OBi110 that has absolutely no echo and also has the relay switch.
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