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.
References in periodicals archive ?
Our vast SunSet MTT customer base benefits the most with the superior economics of buying a new ADSL2+ ATU-R module rather than buying completely new DSL test sets.
Glossary: ADSL - asymmetric digital subscriber line; ATU-R -- ADSL transmission unit-remote; CAP - carrierless amplitude phase modulation; DC - direct current; DMT - discrete multitone; DSL - digital subscriber line; IP - Internet protocol; LCD - liquid crystal display; LED - light emitting diode.
Glossary: ADSL asymmetric digital subscriber line; ATM - asynchronous transfer mode; ATU-R -- ADSL transmission unit-remote; CAP - carrierless and amplitude phase modulation; DMT - discrete multitone; DSL - digital subscriber line; DSLAM - digital subscriber line access multiplexer; HDSL - high bit-rate digital subscriber line; ISDN - integrated services digital network; LCD - liquid crystal display; LED - light emitting diode; POTS - plain old telephone service; SDH - synchronous digital hierarchy; SONET - synchronous optical network.
The TTC 1000 is an easy-to-use instrument that enhances service providers' ability to accelerate ADSL service deployment via true physical-layer ADSL testing with ATU-R emulation.
Available in CO and RT configurations, the CopperGold Data Pump can be used with Motorola's MPC850 to generate a complete reference design for the ATU-R.