Q.553�:�Transmission characteristics at 4-wire analogue interfaces of a digital exchange

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Q.553�:�Transmission characteristics at 4-wire analogue interfaces of a digital exchange �

Recommendation Q.553 (11/88)

Approved in 1988-11-25

Status : Superseded

�	Table of Contents
Replaces Q.507 (1984) and Q.517 (1984)

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2008-04-24

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