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LTPH-UM-1234-01 Overview
HDU-409 Lists 1, 2, and 3 April 30, 2003 1
OVERVIEW
The ADC
®
HiGain
®
HDU-409 Lists 1, 2, and 3 are low-power doubler units
that extend the range of a HiGain repeaterless T1 transmission system. The
doubler units are installed between any doubler-compatible HiGain Line Unit
(HLU) and a HiGain Doubler Unit (HDU) or HiGain Remote Unit (HRU).
Each doubler allows 1.544 Mbps transmission over an additional Carrier
Serving Area (CSA) range.
Each CSA with one doubler encompasses approximately 24,000 feet (7.3 km)
using 24 American Wire Gauge (AWG) or 18,000 feet (5.5 km) using
26 AWG loops. Two doublers can triple the CSA range up to 36,000 feet
(11 km) using 24 AWG or up to 27,000 feet (8.2 km) using 26 AWG loops.
Three doublers extend the 24 AWG range up to 48,000 feet (14.6 km) and
four doublers (with a locally-powered HRU) extend the range up to
60,000 feet (18.3 km). The HDU-409 Lists 1, 2, and 3 are identical except
that:
• The List 1 is only compatible with the HiGain product line.
• Lists 2 and 3 are compatible with HiGain and PG-Flex
®
product lines.
Refer to “PG-Flex Deployment” on page 7 for more information regarding
the PG-Flex doubler applications.