简介
你所需要的
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备受期待的3G版iPad (初代)终于到我们手中了!
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WiFi+3G通讯的iPad。我们1个月前就从FCC的数据库中知道此款产品的存在。
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3G版iPad的外观与WiFi版iPad有明显区别,就是有一个黑色塑料的射频窗口。
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3G版 iPad支持UMTS/HSDPA在850、1900和2100MHz和GSM/EDGE在850,900,1800,和1900 MHz。
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在苹果的戏剧性转变中,iPad没有锁,也没有绑定到特定的运营商。
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在美国,AT&T是唯一支持iPad 3G频率的运营商。T-Mobile也支持,但只能在较慢的EDGE网络上工作。
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取出micro-SIM卡。那是一个非常小的SIM卡!
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iPad的SIM卡尺寸为12毫米x15毫米。不到iPhone 3GS标准尺寸SIM卡的一半的样子。
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你可以把一个全尺寸的SIM卡剪成一个微型SIM卡。它的接触点是完全相容的。
The pin-out for a SIM and micro SIM are the same. You could cut down a full size SIM to fit and it would work.
来自 Holland Rhodes 的话:
The pin-out for a SIM and micro SIM are the same. You could cut down a full size SIM to fit and it would work.
Yup pin-out, clock-speed, etc., are the same; I don't think there's been a SIM whose chip was larger than the contact area for over a decade, so be gentle with a sander, sand the @*%^*^! down, and voila.
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新到3G版iPad,有一个天线连接到显示器总成的背面。图中所示的铜箔片与液晶屏金属支架相连。苹果公司在结构和电气方面都很巧妙地使用了同样的金属。
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抬起外壳上的蜂窝状天线。
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这就是蜂窝状天线。
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从左到右分别是:WiFi/蓝牙天线、GPS天线和3G蜂窝天线。
来自 Francis 的话:
Please, where exactly is the A-GPS chipset on the com. board?
It's the Broadcom part in the top-left of the board, to the left of the Skyworks chip.
Kyle Wiens - 回复
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主板背面。
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没什么好看的,它和WiFi版的完全一样。
Check out the copyright dates between the two boards. Perhaps this indicates the 3g version took longer to work out - which would explain the later release date
The later release date had to do with FCC clearance IIRC.
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苹果公司将电磁干扰屏蔽系统焊接到通讯板上,这使得我们向你展示芯片的过程充满了挑战性。尽管有这样的逆境,我们还是勇往直前,毫不畏惧地向你们展示:
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英飞凌337S3754 PMB 8878 x -金基带IC 5Y06115。这部分在预制单元中有英飞凌的标志,但是苹果公司用白色标记来掩盖制造商。这是和iPhone 3GS完全相同的基带处理器。
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Skyworks SKY77340功放模块。
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三元功率放大器/滤波器。
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英飞凌U6952
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Numonyx 36MY1EE
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右边是三个TriQuint功率放大器:TQM616035A、TQM666032B和TQM676031A。这些都是苹果在近两年前使用在iPhone3G上的芯片。
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博通 A-GPS BCM47501UBG F01003 P11 949871 SN
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这就是3G版iPad的全家福。
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别忘了和WiFi版对比,二者容易混淆。
What I'm truly curious about is adding 3G to a WiFi-only iPad. Would it be possible just to attach the extra required parts to the logic board?
来自 Brandon Papworth 的话:
What I'm truly curious about is adding 3G to a WiFi-only iPad. Would it be possible just to attach the extra required parts to the logic board?
Most likely not. You would need to do some low level software stuff to get it recognised. Also, don't forget that the "PCI-e like" connecter isn't actually on the WiFi model, so you'd be hand soldering a custom connector (where would you source it) - or bypass the connector - and either way be hand soldering on a complex chip. You'd have to buy each edition of the iPad anyway, to examine the pinouts to know where to do it.
Ollie Ford - 回复
Is there conformal coating on all of the parts or in just certain areas?
来自 Jean 的话:
Where is the hard drive? Anybody try installing a bigger hard drive?
There is no standard HDD. It's flashed based solid state memory like on the iPhones which means you can't upgrade it.
来自 Jean 的话:
Anybody know if you hook up and external HD through the usb adapter, if it will read it?
The way it says it reads your camera strongly suggests it simply supports USB Mass Storage over that USBHost, so technically in hardware and even drivers it should be able to. Whether it can do anyhting more with the data in software than pull photos off it is another issue.
来自 Jean 的话:
Ok, so its not upgradeable but its shock proof. Anybody know if you hook up and external HD through the usb adapter, if it will read it?
Someone has worked that out with some jail broken software. It's just not very easy.
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Unless T-Mobile is now offering micro-SIM cards. AT&T still has the exclusive on this Apple device.
thecreative - 回复
As far as I know, the "micro" is only in the sorrounding area of the "electronic" part, so, correctly cut-out big-SIMs will be converted to micro-SIMs.
Luis Alejandro Masanti - 回复
That and their 3G frequencies are incompatible.
Frank - 回复
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it's very simple, so, HP and Google can soon make two low cost clones with webOS and ChromeOS
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gaetano marano - 回复
I can really see a lot of user cutting down their SIM cards to fit. Very practical. Let me know when someone actually does this.
thecreative - 回复
you can make your own microsim...
instructions for all SIMs (standard size) are here:
http://www.touchuserguide.com/2010/04/05...
Stefan Williams - 回复
Great article and images.. There's definitely rooms for a USB port haha
guybrush - 回复
Yea right... And also clone iPhone OS?
Rimsky Sucre - 回复
tmobile now has microsim but no more 3g
Meow Purr - 回复