Heat Dissipation Factors - ADC HiGain HMS-318 List 3 User Manual

December 20, 2004
1
2
3
6
7
20
E R
THERNET EMOTE
The BNC connector J24 (labeled 10 BASE-2), see
to 32 shelves into an integrated network through a 10 BASE-2 (Thinnet) Ethernet LAN (IEEE.802.3). The rear-panel
RJ-45 connector J25 (labeled 10 BASE-T), see
Ethernet LAN (both IEEE.802.3 compatible).
J24 J25
1 0 BA SE -2
OS RS 2 32 P ORT
Daisy-Chaining 10BASE-2 Connections
10BASE-2 management ports of up to x number of shelves can be hubbed together by daisy-chaining together
using the included BNC-T connector. The last 10BASE-2 connection must be terminated with the included 50 ohm
BNC terminator.
H D
EAT ISSIPATION
The HMS-318 List 3 shelf is a 12-inch (30.48 cm) deep individual CO equipment shelf with open-faced mountings for
natural convection cooling. The maximum heat dissipation for open-faced, natural convection-cooled mountings is
limited to 134.7 Watts per square foot as defined in Section 4.1.4 of the NEBS standard for Physical Protection
(GR-63-CORE) for all equipment placed in a CO environment.
The heat dissipation footprint of an HMS-318 List 3 shelf is approximately 5.9 square feet. Therefore, the maximum
permissible heat dissipation per rack is 5.9 square feet x 134.7 Watts per square foot equals 790 Watts.
The maximum allowable heat dissipation for each telco-style equipment rack is:
• 790 watts for a 19-inch (48.3-cm) wide rack
LTPH-UM-1261-01
Table 1-4. J27 – AUX RS-232 Management Port (DTE)
Pin No.
Shield
Transmit Data (TD)
Receive Data (RD)
Data Set Ready (DSR)
Ground (GND)
Data Terminal Ready (DTR)
M P
ANAGEMENT ORTS
Figure
AUX RS 23 2 DTE PO RT
1 0 BA SE -T
5 0
2 5
S PA N PAIR 1
Figure 1-10. Multishelf Network Ports
F
ACTORS
Signal
—
Out
In
In
—
Out
Figure 1-10, can be used to connect the management ports of up
1-10, provides a 10 BASE-2 or a 10 BASE-T (Twisted-Pair)
5 0 2 6
2 5
1
CO PA IR 1
2 6
1 2 3 4 5
1
-4 8VA -4 8V B BAT RTN FG ND
FUS E FUS E
P INS 3 & 4
MUS T B E BRI DGE D
15 A MA X 15 A MA X
Chapter 1: Product Description
Direction
2 5
1
2 6 5 0
CO PA IR 2
2 5
1
5 0
2 6
S PA N PAIR 2
1-13