Hardware
The E220 connects to the computer with a standard Mini USB cable. The device comes with two cables, one short and one long. The long one has two USB A interfaces, one used for data and power and the other optionally only for assistance power in case the computer is not able to provide the full 500 mA (milliamperes) required for the device to work from one USB interface only. If the connection is frequently disrupted or is unstable (or usable at slow speeds only), the two plug USB cable should be used instead.
The E220 antenna is internal; the USB cable does not act as an antenna. The external antenna connector is not accessible without opening the device (voiding any warranty). It is still possible to connect an external antenna without opening the device and using the (internal) external antenna connector. Together with a high gain antenna like an LPDA or an OMNI booster antenna and an adapter, signal strength can be considerably improved. There is also a way to do this, open the modem, remove the small internal antenna, and solder a UMTS-antenna cable onto the board. The warranty will be invalidated, but it can be a cheap and functional way to connect an external antenna.
Read more about this topic: Huawei E220
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