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LTPH-UM-1237-04 Overview
HRM-238 List 1 July 21, 2004 1
OVERVIEW
The HiGain
®
HRM-238 List 1 is a two-slot HiGain Retrofit Management (HRM) shelf. This shelf fits into either
a 19- or 23-inch Central Office (CO) equipment rack. It accommodates up to two HiGain management units
(HMU-319s). It is used in conjunction with 220-type, unmanaged 3190 type, and DDM+ type mechanic shelves
to manage HiGain line units.
The HRM-238 shelf, with two management units installed, provides network management capabilities for a
maximum of 56 HiGain line units (one 3190 or DDM+ or two 220 shelves). Each management unit in the
HRM-238 shelf can manage up to 28 line units.
The HMU-319 management unit installs horizontally into the 4 ¾-inch slots labeled A or B on the HRM-238 shelf
(Figure 1). Each management unit connects to the shelf backplane through a 96-pin DIN connector.
Figure 1. HRM-238 List 1 (front view)
FEATURES
Standard features include:
• 50-pin Amp-type connectors for connection between the management units in the HRM-238 shelf and
previously unmanaged HiGain line units in 220, 3190, or DDM+ mechanics shelves.
• DB-25 connectors for connection to a computer, terminal, or modem
• British Naval Connector (BNC) for connection to a Local Area Network (LAN) or to a HMU-319 multi-shelf
connection
• screw-type terminals for -48 Vdc power connection and grounding
• 23 wire-wrap pins to monitor alarm relay activity
AB
96-pin DIN
connector (J2)
96-pin DIN
connector (J4)
H0543-A