150-712-200-02
Overview
HRE-712 List 1 and List 2
July 26, 2000
1
O
VERVIEW
This document describes and provides installation instructions for the following HiGain
®
Remote Enclosures:
•
HRE-712 List 1 (gel filled)
•
HRE-712 List 2 (air filled)
F
EATURES
•
Aluminum card cage enclosure for up to 12 doublers. Each doubler slot’s pair assignments are shown in
•
Unique card guides that automatically adapt to accommodate the following form factors:
–
Full T1 (1.544 Mbps) doublers: HDU-437 and HDU-407 (Digital Data Service [DDS] mechanics),
HDU-439 (dual 239 T1 mechanics) or HDU-409 (single T1 mechanics)
–
Fractional T1 (772 Mbps) doublers: HDU-217 (DDS mechanics) or HDU-219 (dual 239 T1 mechanics)
–
239 T1 repeaters
–
Integrated Services Digital Network (ISDN) repeaters
•
30-foot (9.1 m), gel-filled or air-filled, 52-pair cable stubs
•
Front leading profile for underground HRE-712 List 2 and standard vertical mounting for HRE-712 List 1 for
aboveground applications.
•
Primary surge protection
•
Seamless, stainless steel cover that maintains weathertight integrity and provides efficient heat exchange to
expel the heat generated within the HRE-712.
•
HRE-712 List 2 has a stainless steel composite baseplate for the HRE-712 List 2 for easy replacement when
used as a 4-slot HRE-454.
A
PPLICATIONS
The primary application of the HRE-712 is to house HiGain doubler units in an HDSL T1 transmission system. It
is designed to protect HiGain doubler units from potentially harmful conditions found in outdoor environments.
•
The HRE-712 List 1, shown in
, contains a gel-core stub and is intended for aboveground
applications that do not require pressurization through the cable stub. If you prefer to pressurize the enclosure,
it can be locally pressurized using an optional pressure-relief valve.
•
The HRE-712 List 2, shown in
, contains an air-core stub and is intended for underground
installations. It can be pressurized from the main feeder cable through its air-core stub. The pressurization
prevents the enclosure from flooding when mounted in underground manholes. Both enclosure models are
similar in that they have primary gas-tube surge protection on all cable pairs. In addition, if you prefer not to
pressurize the enclosure, you can use the optional breather-vent to allow it to breathe.