150-450-105-02, Revision 02 Overview
HRE-450 List 5 November 4, 1998 1
OVERVIEW
This technical practice describes the PairGain®HiGain®Remote Enclosure Model HRE-450 List 5. The HRE-450
is one component of the HiGain T1 transmission system, which transmits data at up to 1.544 Mbps on two
unconditioned copper pairs over the full Carrier Service Area (CSA) range. A HiGain system consists of a line
unit and a remote unit, and may include up to four doublers to extend the transmission distance.
This HRE-450 List 5 is a dual stub, weatherproof enclosure that houses either one single-slot HiGain Remote Unit
(HRU) or one HiGain Doubler Unit (HDU). The HRE-450 is designed to be mounted outdoors on any suitable
above-ground surface, such as a concrete wall or wood telephone pole. The HRE-450 cannot be pressurized, and
therefore cannot be installed in an underground location.
FEATURES
•Compact design
•Easily mounted on a wall or pole using supplied screws
•Front cover opens easily, which enables quick inspection or service of enclosed unit
•Uses weather-sealing cable fittings that protect connections and provide strain relief
•Protects remote or line unit against adverse weather conditions and harmful contaminants
•Uses Quiet-Front Connector Modules (QFCMs) to provide electrical surge protection and corrosion-resistant
wire
APPLICATIONS
The HRE-450 List 5 enclosure is primarily intended for housing a PairGain HRU-411 remote unit when used in
Personal Access Communication Systems (PACS) application. A typical PACS circuit is shown in Figure 1 on
page 2. The figure shows the wire connections from the stub. Stub 1 contains the two network HDSL pairs
(White/Orange and White/Slate) that connect the HRU-411 to the upstream HiGain module (HLU or HDU).
Stub 2 contains the two DS1 pairs(White/Blue and Red/Blue) and the power pair (White/Brown). The power pair
connects the HRU-411 special 60 to 130 V, 8.5W power supply to an external PACS remote 200 mWradio station
such as the NEC radio port. Only the HLU-231 List 8x, HLU-319 List 5x and HLU-388 List 5x line units and the
HDU-409 doubler can be used with the HRU-411 in PACS applications.
