NEC VERSA DOCKING STATION 4000 Manual page 120

Indicator LEDs
A-2 Specifications
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VGA CRT 15-pin port
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PS/2-style mouse port
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PS/2-style keyboard port
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AC power connector
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Microphone — external port; accepts standard
microphone jack
NEC recommends you use a microphone with the
following specifications:
Type: Electric condenser; omnidirectional, monaural
Sensitivity: -42 +3 dB (0 dB=1V/Pa, at 1 Khz)
Impedance: 2.2 K ohm (@1 Khz sine wave)
Operating voltage: 1~10 volts
Current: 0.3 ma
Signal to noise ratio: 50 dB min (1 Pa, 1 KHz, A curve)
Frequency response: 20 -- 16,000 Khz
Connector: 3.5 mm phone plug
Contact: ground = sleeve; tip = output and +D.C. bias:
Ring =NC
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Headphone — external port; accepts standard
headphone or external speaker jack
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Line In — external port for connecting stereo amplifier,
external CD player, or another input source; lets the
docking station act as an output device
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Line Out — external port for connecting to another
audio system; lets the docking station to act as an input
device
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Docking status
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Hard Disk Drive Access status
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Diskette Drive Access status
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Versa Battery Charging status