concentrator

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con·cen·tra·tor

(kon'sĕn-trā-tŏr)
A device for making a substance stronger or purer.
References in periodicals archive ?
Remote access concentrators are more than just modem banks, they accept connection from a wide range of network types, such as ISDN, telephone, ATM, Frame Relay and leased lines.
It is a must-have utility for system administrators, especially because it supports Ascend and Lucent Technologies Remote Access Concentrator products."
Ascend Communications' MAX remote access concentrator and its new ATM switch also have integrated CSUs.