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10 posts

Wannabe Geek


Topic # 108250 27-Aug-2012 22:06 Send private message

Long story short... Found this claim(?) searching for differences between T989 and 9100T models

Samsung Galaxy GT-i9100T SII - 850MHz optimised handset Telstra - Optus reception problemsThe Samsung Galaxy GT-i9100T

Shortly after the release of the original Samsung Galaxy SII (GT-i9100), a model purportedly optimised for the Telstra NextG network was relased. The designation for this SII is the i9100T.

Apart from modifications to the software and user interface, no other physical changes are visible. The only give-away sign is the printing of the Telstra and NextG logo on the back cover.

?

Problems when used with other networks

Most i9100Ts sold by Telstra and their authorised dealers are not locked to the Telstra network. In some cases, the handsets are sold outright, and those customers have used them on networks other than Telstra. With no network lock, the only main annoyance was the pre-loaded Telstra apps and other bloatware. These apps can be removed by loading a different firmware, or by rooting the phone.

Soon, many non-telstra users of the i9100T noticed the signal reception was not as good as it should be, and 3G / celluar data speeds were dismal. In many cases, instead of utilising HSDPA, the phone defaulted to the slower EDGE or GPRS, even when those networks were available. However, with a Telstra SIM card inserted into the i9100T, data speeds were normal. The tests were verified by installing the non-telstra SIM card into an 'international' version of the SII (the non-T i9100), where data speeds were noted to be normal and 3G networks were able to be utilised. The SII is a quad-band UMTS phone. So what is going on here?

Telstra's tweak on the i9100T deliberately degrades performance on non-850MHz networks?

It has been noted that when using a non-Telstra carrier in vicinity of a large city centre or CBD where most other telcos run an 850MHz network, network speeds were acceptable and 3G (UMTS) reception is available. This is the case with Optus' 1900Mhz and Three's 2100MHz networks. However, when further away, 3G reception drops off markedly and eventually falls back to the 2G (GSM) network.

There have been reports the modem firmware on i9100Ts have been custom-made by Samsung at the request of Telstra. Some users claim that by re-flashing the modem firmware with a non-Telstra version solves the problem. Conflicting reports say otherwise, where it makes no difference.

The secret lies in the hardware. There is an antenna/USB/microphone circuit board assembly at the bottom of the phone, below the battery compartment. The board connects to the radio (on the main board) via a short coaxial cable. There are contact springs on the board to make a connection to the actual antenna element, which consists of silver traces on the speaker box assembly.

On the international i9100 handset, put simply, the board is a direct connection between the coax and the antenna element. But on the i9100t, there is an extra component in between the coax and element. This seems to be a bandpass filter of some sort, that favours the 850 and 900MHz frequency. Any other frequency bands (1900, 2100, etc) will be severely attenuated.

But why use a bandpass filter? Maybe Telstra thinks that the other frequencies are generally useless because their NextG network runs primarily at 850MHz. By blocking other frequencies and only letting 850 pass through freely, it could improve the signal-to-noise ratio for use on the NextG network.

Could one of the gurus please comment on this "claim"about the hardware etc
Sorry if this has already been discussed but could find anything with search... Cheers
Source: ?http://webdevsys.com/gt-i9100t.htm

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83 posts

Master Geek
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  Reply # 677860 27-Aug-2012 22:13 Send private message

Sounds legit - if it makes it work better on their network, why would they care how it works on others? I'd only think it's particularly shady if there were no Telstra benefits to doing so

That said, it still sucks for the consumer unless you're with Telstra forever

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  Reply # 677864 27-Aug-2012 22:16 Send private message

Moved to correct forum, seeing this isn't related to Telecom at all.






10 posts

Wannabe Geek


  Reply # 677870 27-Aug-2012 22:24 Send private message

I see you've shifted the discussion to another forum.
Was this not the model that Telecom NZ sold as their own as well.
The point is not about the improvement in 850MHz performance but that it's sold as quad band not as quadband with degraded triband performance.
Cheers

510 posts

Ultimate Geek
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  Reply # 677871 27-Aug-2012 22:32 Send private message

Does this band pass filter pass both the transmit and receive signals?
If yes, perhaps the intention could have been to prevent the transmitter creating interference to other services?

On the receive side, this would only be of benefit if the unwanted signal(s) were strong enough to overload the receiver to the point where blocking or intermod could occur. It would be interesting to know what scenario that Telstra considered there would be a strong enough interfering signal or signals... perhaps in a room full of GSM, WCDMA and other wireless devices, this could happen.

Might be legit, but as a general rule of thumb the operator "optimised" phone gives nothing extra and usually takes something away... although most of the time that "something" is just the operator holding back software updates when the rest of the world has had them for 6 months.




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BDFL
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  Reply # 677872 27-Aug-2012 22:34 Send private message

I've moved it because nowhere in the post it seems to be related to Telecom, seeing this was a Telstra configuration. Because of that the discussion could fit in either the Telecom, Vodafone or 2degrees forum - which means not at all. The best location is the "Mobile handsets" forum.







10 posts

Wannabe Geek


  Reply # 677873 27-Aug-2012 22:39 Send private message

I don't have a problem with the shift Mauricio.
The dig is not at Telecom in general just with this example
We often hear that all the operators do is add logo's, home pages, mms settings etc
This is different. If thats all that Telecom NZ wanted to do why not sell the 9100

119 posts

Master Geek


  Reply # 677882 27-Aug-2012 22:52 Send private message

Interesting topic, had a quick poke at whirlpool.net.au and couldn't find any supporting detail, can I ask what is your source...?



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Wannabe Geek


  Reply # 677883 27-Aug-2012 22:56 Send private message

Sorry edited bottom of first post with it.
You may have missed it

Source: webdevsys.com/gt-i9100t.htm

Did I get the BBCode right... still learning


119 posts

Master Geek


  Reply # 677890 27-Aug-2012 23:07 Send private message

http://webdevsys.com/gt-i9100t.htm
I think I found it, still unsure if it is an Aust telco imposing barriers, interested in other opinions
Sorry, posted after your reply and didn't notice link

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