Chapter 1: Overview; Features; Front And Back Panels; Figure 1-1. Hrm-238 List 2 Front Panel - ADC HRM-238 List 2 User Manual

O
VERVIEW
The HiGain ® HRM-238 List 2 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 with 220-type, unmanaged 3192-type, and DDM+ type mechanic shelves to manage HiGain line units.
The HRM-238 shelf, with two management units installed, provides remote network management capabilities for up
to 56 HiGain line units (two 3192, two DDM+ or four 220-type shelves). Each HMU-319 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 Slot A or Slot B on the HRM-238
shelf. Each management unit connects to the shelf backplane through a 96-pin DIN connector.
F
EATURES
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, 3192, or DDM+ mechanics shelves.
• DB-25 and DB-9 connectors for connection to a computer, terminal, modem, or ThinMux
• 10BaseT (RJ-45) and 10Base2 (BNC) LAN connectors for remote network management.
• Screw-type terminals for -48 Vdc power connection and grounding
• Wire-wrap pins to monitor alarm relay activity (46 total, 23 per HMU)
• Operational temperature range -40° C to +65° C
• Easy insertion of the management units using the card guides
• 19-inch or 23-inch rack mount with variable recess
• Compact 1U height design
• NEBS3 Compliant
• UL-60950 Compliant
F B
RONT AND ACK
The front panel of the HRM-238 shelf has two management card slots (Slot A and Slot B) and a fan assembly bay.
Slot A and Slot B support HMU-319 HiGain Management Units.
Figure 1-1 shows the front panel of the HRM-238 with two HMU-319 management units.
(Ordered Separately)
SLOT A
LTPH-UM-1315-01
P
ANELS
HMU-319

Figure 1-1. HRM-238 List 2 Front Panel

SLOT B
HRM Shelf
Chapter
HMU-319
(Ordered Separately)
1
1-1