Ethernet remote management ports, Daisy-chaining 10base-2 connections, Heat dissipation factors – ADC HiGain HMS-318 User Manual
Page 25: Figure 1-10.multishelf network ports, List, J24 j25, Thernet, Emote, Anagement, Orts
Chapter 1: Product Description
1-13
Table 1-4. J27 – AUX RS-232 Management Port (DTE)
E
THERNET
R
EMOTE
M
ANAGEMENT
P
ORTS
The BNC connector J24 (labeled 10 BASE-2), see
, can be used to connect the management ports of up
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
, provides a 10 BASE-2 or a 10 BASE-T (Twisted-Pair)
Ethernet LAN (both IEEE.802.3 compatible).
Figure 1-10. Multishelf Network Ports
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
EAT
D
ISSIPATION
F
ACTORS
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
Pin No.
Signal
Direction
1
Shield
—
2
Transmit Data (TD)
Out
3
Receive Data (RD)
In
6
Data Set Ready (DSR)
In
7
Ground (GND)
—
20
Data Terminal Ready (DTR)
Out
J24 J25
OS RS 2 32 P ORT
CO PA IR 2
AUX RS 23 2 DTE PO RT
S PA N PAIR 2
1
4-
1
261
R
1
1 0 BA SE -T
1 0 BA SE -2
1
2
3
4
5
CO PA IR 1
-4 8VA -4 8V B BAT RTN FGND
F US E F US E
P INS 3 & 4
MUS T B E BRI DGE D
15 A MA X 15 A MA X
2 5
2 5
2 5
1
1
1
2 6
2 6
2 6
S PA N PAIR 1
2 5
1
2 6
5 0
5 0
5 0
5 0