Data and Voice same time with rev A - Page 3

wILLk0r3 818 · #21 (**permalink**) 03-04-2008, 09:19 PM

Quote:

Originally Posted by wldthng842

Technically it is capable of allowing you to talk and surf at the same time. The question is whether Sprint has enabled it on the leaked ROM.

I've tried, no dice.

bhopki001 · #22 (**permalink**) 03-04-2008, 10:35 PM

If WIFI is on and working you can...

wILLk0r3 818 · #23 (**permalink**) 03-04-2008, 10:43 PM

That's a cheap workaround though! The point is to have it where WiFi isn't available, but I'm sure you know that!

**bedoig** · #24 (**permalink**) 03-05-2008, 01:27 PM

Simultaneous voice and data is not possible on Sprint Rev A. As others said, if it seems like it is working for a minute or two, it is just because the video is buffered ahead of your current position and the download hasn't timed out yet. The data connection will automatically resume after your voice session ends, so you get the illusion that it was working the whole time.

I have really never seen anything saying that concurrent voice and data is possible on Rev A, regardless of carrier implementation. To my knowledge it is still a technological limitation. I guess it's possible, but I've never seen or heard anything supporting it.

**wldthng842** · #25 (**permalink**) 03-05-2008, 01:37 PM

I am not able to find any exact proof that it is possible, but when dealing with Qualcomm it is hard to know how their stuff works unless you buy it from them. Even still they don't release a lot of the details. I guess for now we will have to assume that it is not possible.

AmazingLarry · #26 (**permalink**) 03-05-2008, 02:26 PM

The reason your phone can't handle it is Qualcomm's fault. It can't handle doing both sessions at once so voice takes priority. If they designed a more expensive handset that could handle a voice and data stream at once, you could browse and talk, but they didn't.

So it's Qualcomm's fault you can't use 1xRTT and EVDO at once. CDMA carriers are stuck with whatever Qualcomm makes available.

EDIT: Rev A has nothing to do with anything. It's like 802.11g vs 802.11b except Rev A supports QoS natively. That's the only difference. Doing VoIP over Rev A is like doing VoIP over Ethernet, it's just an application.

**wldthng842** · #27 (**permalink**) 03-05-2008, 02:38 PM

That really has nothing to do with it. EV-DO phones do not have a dedicated 1x chip inside to save on manufacturing costs. That is up to the OEM. Because EV-DO is backwards compatible only one chip is needed for it to access all prior CDMA 2000 networks. Old 1x phones had an analog chip inside but even that didn't allow for simultaneous voice and data.

HSPA (WCDMA) is a technology that allows simultaneous voice and data because it was designed that way. CDMA 2000 was designed before data was a concern as was GSM and thus neither allow for it to happen. There are rumors that EV-DO rev A was designed to support simultaneous voice and data but it has never been confirmed as far as I can tell. It is still up to the carrier to allow it to be activated.

EV-DV, a Qualcomm technology was not backwards compatible with old CDMA 2000 technologies like EV-DO was. It allowed for both voice and data to transmit at the same time. It was never deployed and thus the technology is being built into both EV-DO rel A/B and UMB (EV-DO rel C). UMB does support simultaneous V&D because it is a IP only network (VOIP is the only way to transmit voice). To the best of my knowledge neither EV-DO rel A or HSPA are IP based networks. They have a voice protocol and a data protocol. They just have transmit schemes in place to allow simultaneous V&D to happen. This was built so that Video Calling could be implemented.

Sorry for writing a novel, but access networks is my specialty. Please correct me if I am wrong (provide link pls). But this is what my EE degree and experience has taught me to believe.

nico4k · #28 (**permalink**) 04-21-2008, 12:35 PM

i was wondering if this wa possible also....i guess we are out of luck..until someone figures out a way...as always..

hlouie · #29 (**permalink**) 05-08-2008, 07:56 PM

I remember in the early day's of the PPC-6700(Apache) hacking there was a registry hack that allow this function. I'm trying to search the forum now. And now that I own a PPC-6800(Titan)

Nunim · #30 (**permalink**) 05-09-2008, 01:54 AM

Quote:

Originally Posted by wldthng842

They have a voice protocol and a data protocol. They just have transmit schemes in place to allow simultaneous V&D to happen. This was built so that Video Calling could be implemented.

It would probably be much simpler to just use VOIP for the voice in a video call, rather then try and use both voice and data transmission while keeping them in sync.