[技巧轉貼]加速 PDA 與3G 藍芽連線上網之速度

轉載自Brighthand:

Raising hx4700 bluetooth dialup speed to match EDGE/3G/UMTS phones

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Here is small tweak I figured out and want to share with you.
It's meant for people that use their ipaq with EDGE/3g/UMTS cellphones to access internet. Basically any phone that is able to connect faster than 115200kbps.

Bluetooth DUN (dialup network) connection speed is limited to 115200 bps (14K/s) in hx4700 settings. However, 3g phone is capable of giving you 384000 bps (40K/s) * edit * actually I have got feedback that on EV-DO network some people now get 80KB/s from their phone to their iPAQ. Obviously, bottleneck is in IPAQ.

It is possible to edit speed of connection by using registry editor, such es Tascal Regedit or Resco Registry editor, etc.

All usual disclaimers apply, you do it at your own risk. I made this tweak on hx4700 running on WM5 with Widcomm stack. While I think that it should work on WM2003, 2003SE too, I cannot guarantee that. Try if you want.

1. Set speed of your connection to be exactly 115200. Later, this will help us to identify bytes we need to patch.

2. Find in registry HKCU\Comm\RasBook\"yourconnectionname"\DevCfg

3. It is a data array with some stuff I do not know much about, however, it contains 3 bytes that define connection speed. For example, 115200 decimal = 01.C2.00 hex, stored backwards in the memory as 00.c2.01

4. So find that sequence. In my case it was in bytes 13,14,15

5. Change value to the one from the list below

256000 bps =3E800 -> 00.e8.03
384000 bps =5DC00 -> 00.dc.05
460800 bps =70800 -> 00.08.07
921600 bps =E1000 -> 00.10.0e

Chosen speed should be faster than speed of cellular connection, to cover some protocol overhead. In case of UMTS (max 384kbps) I have chosen speed of 460800 bps. If you use EDGE, than 256000 should be enough.

6. Now, we switch off 4700 for a minute to let registry values flush into persistent memory.

7. Soft reset. Enjoy higher speeds.

P.S. My machine is stable after this tweak. Speed is 2xFaster now. Download tests gave me consistent 33-38 K/s on my 3g network. However, I do not know how it will behave if you edit connection settings again. I guess it will fall back to old speed setting. I simply do not open it now.


以上個人試過了,確實有效,配合遠傳 3G上網,快多了
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