ATU

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atu

[¦at¦ü]
(physics)
A unit of underpressure or pressure below atmospheric pressure in the metric technical system; equal to 1 technical atmosphere.

atü

[¦at¦yü]
(physics)
A unit of overpressure or gage pressure in the metric technical system; equal to 1 technical atmosphere.

ATU

(ADSL Transceiver Unit) A device that provides ADSL modulation of the telephone line. The device at the telco side is the ATU-C (Central), which is a line card plugged into the DSLAM. The unit at the customer's side is the ATU-R (Remote), which is either an external modem or a card plugged into the PC.