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Shelf Installation
Cooling Requirements
The following rules should be adhered to when stacking shelves in open frame or cabinet. The rules
are based on worst case power requirements (fully loaded 96 Watt power consumption). Although
lightly loaded shelves require less cooling, we recommend that these rules be followed to eliminate
the necessity to upgrade in the field. In any case, be sure to use blank filler panels in any unused slot
of the shelf when stacking. Refer to
Power Supplies
Redundant power supplies run cooler than non-redundant supplies because the load is divided
between them. Thus, the cooling requirements are lower for a system with redundant supplies.
Cabinet Types
Cooling requirements vary depending on whether the OCM shelf is installed in a low or high
density cabinet. A low density cabinet should holds only one or two OCM shelves. A high density
cabinet can hold three or more OCM shelves.
Fan Tray Assemblies
In any standard cabinet, you can install Fan Tray Assemblies for forced air cooling. One fan tray
can cool two shelves below it and two shelves above it, drawing cool air in at the bottom and
exhausting warm air at the top. This means that you can install two shelves below the bottom fan
tray, two shelves above the top fan tray, and up to four shelves between two fan trays. You cannot
install a Fan Tray assembly between an OCM main shelf and expansion shelf.
High density cabinets are typically equipped with blowers at the top and bottom, so fewer fan trays
are required. In such cabinets you can stack four shelves before you must install a fan tray.
Aux. Fan Assembly
AC Domestic
AC Export
DC
Air Baffles
In an open frame rack or low density cabinet, you can install Air Baffles, instead of fan trays, for
convection cooling. The baffle draws cool air in at the bottom (for the shelf above it) and exhausts
warm air at the top (from the shelf below it). With non-redundant supplies, you must install a baffle
above every shelf. With redundant supplies, you must install a baffle above every two shelves. (A
baffle is not required at the very bottom or the very top, only between shelves.) The GDC part
number for the baffle assembly is 010D787-001. You cannot install a baffle between an OCM
main shelf and expansion shelf.
In an open frame rack with each shelf drawing no more than 60 watts ac (or 70 watts dc), you can
stack four shelves before you must install a baffle, regardless of the power supply configuration.
Air Flow Guidelines
Proper installation of the shelves with fans or baffles creates an enclosed column and provides the
proper air flow. To provide proper air flow through a cabinet or rack, follow the guidelines below:
•
Each shelf requires an unrestricted air flow of at least 37 cfm.
•
Do not install anything on the shelf that may block the flow of air through the closed column
formed by stacked shelves.
•
Allow no open space between components; you must install blank front panels in all unused
slots. Failure to do so may result in overheating and subsequent power supply shutdown.
•
There must be adequate provision for the circulation of cooling air and exhaust of warm air.
2-2
Table 2-1
Office Connunications Manager OCM-1000/OCM-2000
Installation & Operation
Cooling Requirements
and
Figure
2-1,
Figure
Part No.
010B160-001
010B161-001
010B162-001
2-2, and
Figure
2-3.
036R340-000
Issue 16
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