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150-450-141-02, Issue 2
P
RODUCT
This technical practice describes the HiGain
component of a HiGain (T1 transmission) system, which transmits data at up to 1.544 Mbps ontwo unconditioned
copper pairs over the full Carrier Service Area (CSA) range. A HiGain system consists of aline unit and a remote
unit (usually housed in a remote enclosure), and may include up to four doublers to extendthe transmission
distance.
This HRE-450 List 4A is a weatherproof enclosure that houses either one single-slot HiGain Remote Unit
(HRU)or one HiGain Doubler Unit (HDU). The HRE-450 List 4A mounts outdoors on any suitable
above-groundsurface, such as a concrete wall or wooden telephone pole. Because it cannot be pressurized, the
HRE-450 List 4A cannot be installed in an underground location. To reduce emissions, the HRE-450 List 4A
features a metallized gasket around the edges.
The HRE-450 List 4A can also be used to support E1 circuits, by housing either an E1 Doubler
Unit (EDU) or E1 Remote Unit (ERU).
Figure 1 on page 2
shows three different HRE-450 configurations for either T1 High-bit-rate-Digital Subscriber
Line(HDSL) circuits or G.703 E1 circuits. The line unit is installed in a Central Office (CO) shelf and the HRU
or HDU is housed in an HRE-450. Optional HDUs provide the ability to double or triple the distance range for
customer applications located outside the CSA.
HRE-450 List 4A
O
VERVIEW
®
Remote Enclosure Model HRE-450 List 4A. TheHRE-450 is one
August 18, 1998
Product Overview
1
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