LTPH-UG-1166-01
Overview
HMS-317 and HMS-318
July 15, 2002
15
P
OWER
D
ISSIPATION
F
ACTORS
The HMS-317 and the HMS-318 are both 12-inch (30.48 cm) deep individual CO equipment frames with
open-faced mountings and natural convection cooling. GR-63-CORE limits the maximum dissipation of the HMS
shelf to 134.7 Watts per square foot.
shows a typical CO equipment rack layout using HMS-317 or
HMS-318 shelves. As the figure illustrates, heat baffles should be placed between every two shelves to help reduce
the chimney heating effect.
The maximum allowable power dissipation for each equipment rack is:
•
800 watts for a 19-inch wide rack
•
946 watts for a 23-inch wide rack
Figure 15.
Central Office Equipment Rack Configuration
Refer to the HLU-319 or ELU-319 user manual to determine the maximum number of HLU cards
that can be installed in a shelf before affecting the maximum power dissipation density of the
shelf.
28 Line Units + HMU-319
28 Line Units + HMU-319
28 Line Units + HMU-319
28 Line Units + HMU-319
Baffle (Henry # HMWD2164-02)
Fuse Panel
12 Open Shelf Spaces