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700-701-100-02 Functional Description
UTU-701 and ETU-751 List 1 August 9, 2002 13
Power Sources
The line and desktop units receive power from the following sources:
• A shelf-mounted UTU-701C receives power from a local source of -36 Vdc to -72 Vdc.
• An enclosure mounted UTU-701C receives power from a local source of -36 Vdc to -72 Vdc or from the
enclosure’s built-in AC-to-DC power supply (when provided).
• The ETU-751C desktop unit receives power from a source of 100 to 240 volt, 50 or 60 Hz, AC power.
Input voltage for the UTU-701C line unit (nominal -48 Vdc, tolerance -36 to -72 Vdc) must be
supplied by an isolated DC source that complies with TNV or earthed SELV requirements of the
latest version of IEC 950.
The single-pair rate selectable HDSL units (local and remote) must be locally powered.