The Pop-Port interface (originally code-named "Tomahawk") is a plug-in port, available with many Nokia mobile phones. The port consists of one metal pin on either end, and a plastic tab containing thirteen contacts.
The port contains signals for hands-free microphone, stereo speakers, FBus Rx/Tx or USB signals for the phones supporting them, power output for feeding the accessories that do not have their own batteries, and the Accessory Control Interface (ACI), a bidirectional serial control bus for connection of phone accessories, with a proprietary protocol. It is also used to upgrade the phones software using a specific USB data cable and the Nokia Software Updater.
Nokia phones made since 2007 do not use Pop-Port. Instead they use mini-USB or micro-USB sockets for data services and a 4-part 2.5mm or 3.5mm "standard" audio socket. Some models also use microUSB for charging.
Source : Wikipedia
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