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Old 04-11-2006, 04:18 PM   #1 (permalink)
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Lightbulb EDGE vs. Data vs. Voice vs. 8700c

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Okay, I understand voice and data are billed separately by Cingular but on a true EDGE connection are voice and data sharing the same "bandwidth" or are they on separate, but equal, channels?

I ask because if I run VeriChat active in the background, the quality of my voice conversations is cheapened.

Is that a feature of EDGE or a sign my 8700c is trying to process too much information locally and is failing? If I exit and logoff VeriChat my voice quality returns to excellent in the NYC area.

Is that normal behavior? Do we get allotted a certain amount of "bandwidth" to use both voice and data and if one squeezes the other out on an EDGE connection that's just the way it works -- or is data like VeriChat on its own "pipe" and my voice calls are on a separate "pipe" and that's what allows me to chat and web surf while I'm talking on the phone?
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Old 04-11-2006, 04:54 PM   #2 (permalink)
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same pipe


share time slots


search the web for time division multiple access

it will give you a good background on the technology you are using....TDMA
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Old 04-11-2006, 05:03 PM   #3 (permalink)
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Okay, so I searched and found this:

"Time division multiple access (TDMA) is digital transmission technology that allows a number of users to access a single radio-frequency (RF) channel without interference by allocating unique time slots to each user within each channel. The TDMA digital transmission scheme multiplexes three signals over a single channel. The current TDMA standard for cellular divides a single channel into six time slots, with each signal using two slots, providing a 3 to 1 gain in capacity over advanced mobile-phone service (AMPS). Each caller is assigned a specific time slot for transmission."

Does that last sentence mean simultaneous voice and data must share one slot per caller or can more than one slot be allocated to voice and data per call or is it determined per phone or per request for multiple connections from one device?
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Old 04-11-2006, 05:07 PM   #4 (permalink)
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its network dependant..... depends on the network traffic and load balancing going on


of the available slots,6, 2 for data, 1 for voice...etc...

its saying there is 6 available, but not all for data and not all for voice, and depending how many other users are on that tower or repeater
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Old 04-11-2006, 05:12 PM   #5 (permalink)
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Okay, thanks. So does it matter if VeriChat is running in the background during a call or not? The researched answer seems to suggest it should not make a difference in call quality, right? Or it is the BlackBerry itself that is having trouble managing simultaneous heavy data and voice across multiple slots?
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Old 04-11-2006, 05:15 PM   #6 (permalink)
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i think it might be the BB, they arent that robust handhelds as far as power goes...
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Old 04-11-2006, 05:22 PM   #7 (permalink)
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Okay, cool. I think you're right! Things get a little slower all over on the BB when you have five active VeriChat connections going on all five services! Voice quality really gets fuzzy and mungy.

Thanks for the help!
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Old 04-11-2006, 05:22 PM   #8 (permalink)
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When I have verichat or any bandwidth hungry app running, voice calls don't even come trhough. ANd when a call comes through and you have verichat running, you'll find that verichat disconnects.

That must indicate that they're sharing the same connection/packets/etc
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Old 04-11-2006, 05:25 PM   #9 (permalink)
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you are very welcome
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