Positron Teleline Isolator 751239, Description And Installation

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(16 pages) Standalone HDSL Unit 1
751239
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1. The Standalone HDSL Unit
The Standalone High-bit-rate Digital Subscriber line (HDSL) unit provides high
voltage isolation between one, four-wire Remote Terminal Unit (HTU-R) located
inside the substation, and an HDSL CO Terminal Unit (HTU-C) located at the
Central Office (CO).
The unit consists of an isolator card mounted inside a compact enclosure. The
enclosure is molded from fiberglass, making it a lightweight, flame retardant
container of high dielectric strength. Its fiberglass body limits the possibility of
many kinds of infiltration while providing reliable isolation from external ground
potentials.
The shelf is shipped with a 10’ insulated 12-conductor cable for connection to the
CO’s incoming cable and mounting hardware.
Its features include the following:
• The unit provides isolation 50 kVrms (70 kV peak) while maintaining full
communication between terminals.
• Communication is maintained across the gap by isolation transformers that
provide low-loss, low-distortion transmission.
• The unit does not require power from either the CO or an external supply to
operate.
• The enclosure resists the infiltration of dust, mist, and water from sprinklers.
• The card jumper settings enable you to configure the card to provide a
simplex sealing or a loop sealing return path on the CO side. The current will
not be transferred to the Station side. The card is shipped with these options
disabled.
For a view of the Standalone HDSL Unit enclosure, refer to Figure 1.
For a view of the Standalone HDSL Unit, cover open, refer to Figure 2.