ALFA ADH24SB, ADH32SB, ADH16SB User Manual
Quick Installation Guide
for 16/24/32 ports
Dual Speed Hub
ADH16SB
ADH24SB
ADH32SB
FCC COMPLIANCE STATEMENT
This equipment generates and uses radio frequency energy and if not
installed and used properly, that is, in strict accordance with the
instructions provided with the equipment, may cause interference to
radio and TV reception. The equipment has been tested and found to
comply with the limits for a Class B computing device in accordance
with the specifications in Subpart B of Part 15 of FCC rules, which are
designed to provide reasonable protection against such interference in
a commercial environment. However, there is no guarantee that
interference will not occur in a particular installation.
If you suspect this equipment is causing interference, turn your hub on
and off while your radio or TV is showing interference to determine
the source of the interference.
You can try to correct the interference by one or more of the following
measures:
1. Reorient the receiving radio or TV antenna where this may be done
safely.
2. To the extent possible, relocate the radio, TV or the other receiver
away
from the equipment.
3. Plug the computer which has the equipment installed into a different
power
outlet so that equipment and the receiver are on different branch
circuits.
If necessary, you should consult the place of purchase or an
experienced radio/ television technician for additional suggestion.
CAUTION : The phone jack cannot be connected to telephone system.
Contents
Chapter 1 Introduction ....................................1
Chapter 2 Features & Specifications .................3
Chapter 3 Package Contents .............................5
Chapter 4 Physical Description ........................6
Chapter 5 Installation ......................................9
Chapter 6 Trouble-shooting .............................12
1
Introduction
1
Congratulations on your purchase of this rackmount stackable dual-speed
hub. Migrating from traditional 10Mbps Ethernet to 100Mbps Fast
Ethernet is now simple and affordable with these dual-speed hubs. These
high performance 16-port, 24-Port, 32-port 10/100Mbps stackable dualspeed hubs are equipped with 16, 24, 32 RJ45 dual-speed ports, one uplink
port and one internal 2-port switch.
Typically a dual-speed hub has two independent internal network segments:
10Mbps segment and 100Mbps segment. Depending on the speed of
attached network devices, each individual port of a dual-speed hub
provides Auto-Negotiation capability which automatically senses and
selects optimum speed at 10Mbps or 100Mbps. A 10Mbps network device
attached to the dual-speed hub will be able to communicate with other
network devices attached to the hub running at 10Mbps. On the other hand,
a 100Mbps network device attached to the dual-speed hub will be able to
communicate with other devices attached to the hub running at 100Mbps.
Therefore, dual-speed hub can be 10Base-T hub when all the connecting
nodes are running at 10Mbps as illustrated in Figure 1-1, or can be
100Base-TX hub when all the connecting nodes are running at 100Mbps as
illustrated in Figure 1-2. These stackable dual-speed hubs are the ideal
hubs for both 10Base-T and 100Base-TX networks.
100Mbps100Mbps10Mbps10Mbps
1 2 3 4
9 10 11 12
Dual Speed Stackable Ethernet Hub
24-Port 10/100Mbps
Switch
Power
10M
100M
50+3010531
%
%
COL
COL
UTIL
UTIL
1 2 3 4 5 6 7 8 9 1011 12 1314 15 1617 18 1920 2122 23 24
with Internal Switch
50+3010531
100M
LNK/ACT
5 6 7 8
10Mbps
10Mbps
Figure 1-1 10Mbps segment connecting
10Mbps devices
13 14 15 16
17 18 19 20
21 22 23 24
10Mbps
Uplink
10Mbps
100Mbps10Mbps
1 2 3 4
Dual Speed Stackable Ethernet Hub
24-Port 10/100Mbps
Switch
Power
10M
100M
50+3010531
%
%
COL
COL
UTIL
UTIL
1 23 4 56 78 9 101112 131415 161718 1920 2122 23 24
with Internal Switch
50+3010531
100M
LNK/ACT
100 Mbps
100Mbps
Figure 1-2 100Mbps segment connecting
100Mbps devices
5 6 7 8
9 10 11 12
13 14 15 16
100Mbps
1
17 18 19 20
21 22 23 24
Uplink
100Mbps
Dual-Speed hub with internal switching function automatically switches
data traffic between devices running at different speed, which allows
communications between ports running at 10Mbps and ports running at
100Mbps. Dual-Speed hub with internal switching function can save
money by eliminate the need to purchase expensive Switches for users
with mixed speed network environment. The connection of the DualSpeed hub with internal switching function is illustrated as in Figure 1-3:
Internal
Switch
100Mbps10Mbps
1 2 3 4
9 10 11 12
Dual Speed Stackable Ethernet Hub
24-Port 10/100Mbps
10M
%
COL
UTIL
Switch
Power
1 2 3 4 5 6 7 8 9 1011 12 1314 15 1617 1819 20 2122 23 24
10Mbps
with Internal Switch
100M
50+3010531
50+3010531
%
COL
UTIL
100M
LNK/ACT
5 6 7 8
100 Mbps
13 14 15 16
17 18 19 20
21 22 23 24
10Mbps
Uplink
100Mbps
Figure 1-3 Internal switch links 10Mbps and
100Mbps segments
When you ready to expand your network, the Uplink port provides an easy
way to connect to another hub with regular straight-through Category 5
cable
These Dual Speed Hubs provide the stackable feature. They can stack
together up to 6 hubs to form a logically Big dual-speed Hub.
These Dual-Speed hubs can be set up as stand-alone units or it can be
mounted on a standard 19" rack (rack mounting kits are included with the
unit).
2
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