The '9600 port' is an industry-specific name given to a special connector on the back of amateur radio VHF and UHF transceivers. It is used for connecting a packet radio modem or any other type of data-modem which uses audio tones to convey data.
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This port is capable of transmitting and receiving data at speeds of at least 9600 bits per second, but usually faster. This is achieved by bypassing the highpass, lowpass, preemphasis, and deemphasis filters normally contained in the microphone and speaker circuits.
Amateur radio data ports which are not "9600 capable" are typically limited to a max speed of 1200 to 3000 bits per second.
Commonly this 9600-capable data port uses a mini-DIN connector.
Modem Manufacturers
There are a number of manufacturers making modems intended for this 9600 port / data port.
Digital Voice
The 9600 port can be used to connect a digital voice adapter, or dongle, which allows analog amateur radios to transmit and receive ICOM's D-Star digital voice protocol (AMBE2020).
Users of this technology
This 9600 port is used to communicate with some amateur radio satellites using the packet radio
A 9600-baud capable amateur radio and modem are installed aboard the International Space Station
The 9600 port can also be connected to computer's soundcard for use with software-based data modems: