Quick Installation Guide
for 16/24/32 ports
Dual Speed Hub
ADH16SB
ADH24SB
ADH32SB
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
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 dual-
speed hubs are equipped with 16, 24, 32 RJ45 dual-speed ports, one uplink
port and one internal 2-port switch.
Typically adual-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.
10Mbps
100Mbps
10 11 12
10Mbps
100Mbps
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24-Port10/100MbpsDual Speed Stackable Ethernet Huwitb
h
Internal Switch
24-Port10/100MbpsDual Speed Stackable Ethernet Huwitb
h
Internal Switch
1
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UTIL
Switch
Power
100M
Switch
Power
100M
LNK/ACT
LNK/ACT
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10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
1
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10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
13 14 15 16
21 22 23 24
Uplink
13 14 15 16
21 22 23 24
Uplink
100Mbps
10Mbps
100Mbps
10Mbps
100Mbps
10Mbps
100Mbps
10Mbps
Figure 1-1 10Mbps segment connecting
10Mbps devices
Figure 1-2 100Mbps segment connecting
100Mbps devices
1
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 Dual-
Speed hub with internal switching function is illustrated as in Figure 1-3:
Internal
Switch
10Mbps
100Mbps
1
5
2
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3
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4
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9
10 11 12
17 18 19 20
24-Port10/100MbpsDual Speed Stackable Ethernet Huwitb
h
Internal Switch
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U
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UTIL
Switch
Power
100M
LNK/ACT
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
13 14 15 16
21 22 23 24
Uplink
100Mbps
10Mbps
10Mbps
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
2
Features & Specifications
(1) Features
Consists of one internal 10Mbps Ethernet segment and one internal
100Mbps Fast Ethernet segment.
Supports Auto-Sensing RJ45 ports which automatically sense and
select optimum speed and route data traffic to correspondinginternal
segments.
Built-in Uplink selection for the last port to connect with regular
straight-through cable to another hub.
Network Utilization LEDs provides simple reading on hub s traffic
status.
Built-in internal switching function automatically switches data
traffic between devicesrunning at differentspeed establishes
communications between ports running at 10Mbps and 100Mbps.
Support stackable function for stacking up to 6 hubs to form a
logically single dual-speed hub.
Standard 19" Rack Mountable
Two-year warranty
3
(2) Specifications
Standards : IEEE802.3 & 802.3u
10/100Mbps Ports : RJ45 x 16 (16-Port Rackmount DualSpeed Hub) or
RJ45 x 24 (24-Port Rackmount DualSpeed Hub) or
RJ45 x 32 (32-Port Rackmount DualSpeed Hub)
Hub LEDs :Power, Internal Switch
Segment LEDs :Collision, Utilization
Port LEDs :Speed Status(10 or100), Link/Activity Status
Internal Switch :1K MAC Address Table
256KB Buffer Memory
Dimensions : 17.3x 7.9 x1.75 in./440 x201 x 45mm
Weight : 5.1 lb./2.3kg
Power : 100-240VAC, 50-60Hz internalfull-range switching power
Operating Temperature: 32-1310F (0-550C)
Operating Humidity :10-95% (Noncondensing)
Emission : FCCClass B &CE
4
3
Package Contents
One Stackable Du-alSpeed Hub
One power cord
User s manual
Stacking Cable
Rackmountaccessories
%
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5
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CO
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U
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U
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16-Port10/100Mbps
Uplink
Switch
Power
1
0
0
M
Dual Speed
Stackable Ethernet Hub
1
2
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5
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7
8
9
1
0
1
1
1
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1
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16
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A
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T
10 11 12
13 14 15 16
16-Port Rackmount
Dual Speed hub
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COL
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1
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10 11 12
U
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U
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24-Port10/100Mbps
1
1
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1
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1
12
L
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K
CT
Uplink
Switch
Power
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0
M
Dual Speed
Stackable Ethernet Hub
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24
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CT
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24-Port Rackmount
Dual Speed hub
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COL
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U
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32-Port10/100Mbps
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CT
Uplink
Switch
Power
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Dual Speed
Stackable Ethernet Hub
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21 22 23 24
25 26 27 28
29 30 31 32
32-Port Rackmount
Dual Speed hub
Figure 3-1 Package contents
5
4
Physical Description
(1)Panel
LED Panel
Uplink Port
8
RJ45 connectors
2
%
UTIL
1
5
1
0
3
0
5
0
+
%
UTIL
1
5
1
0
3
0
5
0
+
10M
COL
10M
COL
1
3
4
5
6
7
16-Port10/100Mbps
Uplink
Switch
Power
100M
Dual Speed
Stackable Ethernet Hub
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16
LNK
ACT
9
10 11 12
13 14 15 16
IN
OUT
16-Port Rackmount
Dual Speed Hub
Stacking ports
10M Col. and Util.LED
100M Col. and Util.LED
%
UTIL
1
5
10 30 50+
%
UTIL
1
5
10 30 50+
10M
COL
100M
COL
16-Port10/100Mbps
100M
LED
100M
Switch
Power
Dual Speed
Stackable Ethernet Hub
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16
LNK
ACT
Link/Activity
LED
Internal Switch LED
Power LED
LED Panel
24-Port10/100Mbps
Uplink Port
10 11 12
RJ45 connectors
6
%
UTIL
1
5
1
0
3
0
5
0
+
%
UTIL
1
5
1
0
3
0
5
0
+
10M
COL
100M
COL
1
2
3
4
5
7
8
9
100M
1
2
3
4
5
6
7
8
9
1
0
1
1
1
2
LNK
ACT
Uplink
Switch
Power
100M
Dual Speed
Stackable Ethernet Hub
13 14 15 16 17 18 19 20 21 22 23 24
LNK
ACT
13 14 15 16
17 18 19 20
21 22 23 24
IN
OUT
24-Port Rackmount
Dual Speed Hub
Stacking ports
10M Col. and Util.LED
100M Col. and Util.LED
%
UTIL
1
5
10 30 50+
%
UTIL
1
5
10 30 50+
10M
COL
100M
COL
24-Port10/100Mbps
100M
1
2
3
4
5
6
7
8
9
10 11 12
LNK
ACT
100M
LED
100M
Switch
Power
Dual Speed
Stackable Ethernet Hub
13 14 15 16 17 18 19 20 21 22 23 24
LNK
ACT
Link/Activity
LED
Internal Switch LED
Power LED
Figure 4-1 Panel description
6
LED Panel
Uplink Port
13 14 15 16
RJ45 connectors
5
%
UTIL
1
5
1
0
3
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%
UTIL
1
5
1
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9
10 11 12
10M
COL
100
COL
100M
1
2
3
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5
6
7
8
9
10 11 12 13 14 15 16
LNK
ACT
Uplink
Switch
Power
100M
32-Port 10/100Mbps
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
LNK
ACT
17 18 19 20
21 22 23 24
25 26 27 28
29 30 31 32
IN
OUT
32-Port Rackmount
Dual Speed Hub
Stacking ports
10M Col. and Util.LED
100M Col. and Util.LED
%
UTIL
1
5
10 30 50+
%
UTIL
1
5
10 30 50+
10M
COL
100M
COL
32-Port10/100Mbps
100M
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16
LNK
ACT
100M
LED
100M
Switch
Power
Dual Speed
Stackable Ethernet Hub
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
LNK
ACT
Link/Activity
LED
Internal Switch LED
Power LED
Figure 4-1 Panel description (cont.)
7
(2)LED
LED
Color Status
Description
Power is supplied
Number of LED
Lit
Green
Off
PWR
(Power)
One for thewhole Hub
No power
The internal switch isactive
The internal switch isinactive
Collision detected inthis segme
No Collision
Lit
Green
Off
Switch
(Internal Switch
One for thewhole Hub
Lit
Yellow
Off
COL
(Segment
Collision)
One for 10Mbps
segment and onefor
100Mbps segment
UTIL.
(Segment
Utilization)
One set for10Mbps
Indicate network utilization segment and oneset for
100Mbps segment
Green
Lit
Lit
A valid linkis established
LNK/ACT
(Link/Activity)
Data packets received
No link isestablished
One for each port
Green Flash
Off
This port runat 100Mbps
Not connected orrun at 10M
Lit
Green
Off
One for each port
100Mbps
Table4-1 LED description
8
5
Installation
1. Operating Environment
These Dual Speed Hubs must be installed and operated within the limits
of specified operating temperature and humidity (see previous section
under Specifications). Do not place objects on top of the unit. Do not
obstruct any vents at the sides of the unit. Do not position the hub near
any heating source such as heater, radiator, or direct exposure to sun.
Prevent entering of water and moisture into the unit. If necessary, use
dehumidifier to reducehumidity.
2. Connecting tonetwork devices
Connect one end of the network cable to any of the RJ45 ports on the
front panel, and connect the other end of the network cable to the RJ45
port of the network device. The network cables must comply with
EIA/TIA 568 specifications and Category 5 standard for 100Mbps data
rate or minimum Category 3 for 10Mbps data rate. Maximum length
between the hub and any network devices is 100 meters (300ft). Once
the network cable is connected on both ends and the attached network
devices are powered on, the green Link Status LED should be lit. If the
connected network devices are running at 100Mbps, the green Speed
LED (100M) shouldalso be lit.
Dual Speed Hub
Network
Category 5
EIA/TIA 568
UTP Cable
Adapter
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24-Port10/100Mbps
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Uplink
10/100 FAST ETHERNET CARD
Switch
Power
0
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M
Dual Speed
Stackable Ethernet Hub
FCC ID
:
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RTL8139
100m
Figure 5-1 Connect the huband network device
3. Uplink toAnother Hub
Use the uplinkport (the lastport) to connectto another hubas illustrated
Connecting cable must comply with EIA/TIA 568
in Figure 5-2.
specifications and Category 5 (100Mbps) standards to connect the hubs.
The Uplink port of the Dual-Speed hub supports Auto-Sensing function
which will automatically sense the speed of the connected hub and
operates at either 100Mbps or 10Mbps speed. If the connected hub is
another Dual-Speed hub or 100Base-TX hub, the transmission speed
between the twohubs will beset at 100Mbpsand the greenSpeed (100M)
LED should belit. The maximumlength of thecable should notexceed 5
meters (15ft) when connecting two hubs running at 100Mbps and 100
meters (300ft) whenconnecting two hubsrunning at 10Mbps.
9
Uplink
Uplink Port
Dual Speed Hub
10 11 12
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24-Port10/100Mbps
1
1
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L
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CT
Uplink
Switch
Power
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Dual Speed
Stackable Ethernet Hub
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Uplink Port
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U
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24-Port10/100Mbps
1
1
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Uplink
Switch
Power
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Dual Speed
Stackable Ethernet Hub
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21 22 23 24
Normal Port
Figure 5-2 Uplink to another hub
4. Stacking Hubs Together
These Dual Speed Hubs provide two stacking ports. Users may connect two
hubs using the supplied stacking cable. Connect one end of the stacking
cable to the IN stacking connector of the hub and the other end of the
stacking cable to another hub OUT stacking connector. You may stack up to
10 hubs. The hubs cascaded together through stacking ports are in one
collision domain and therefore considered as one logical dual speed hub.
Internal
Switch
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24-Port10/100Mbps
1
1
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L
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CT
Uplink
Uplink
Uplink
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h
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h
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P
o
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%
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CT
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Dual Speed
h
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T
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2
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M
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-ob
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h
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%
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-ob
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10Mbps
9
1
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K
T
Uplink
100Mbps
13 14 14
S
w
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c
h
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h
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P
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1
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1
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K
T
Uplink
S
w
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t
c
h
0
0
M
Dual Speed
Stackable Ethernet Hub
1
3
1
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1
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P
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13 14 15
24
%
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10 112
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6
Figure 5-3 Stack 6 hubs together
L
A
N
C
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T
Uplink
S
w
i
t
c
h
0
0
M
Dual Speed
1
3
1
4
1
5
1
6
1
7
1
8
1
9
L
N
K
P
o
w
e
r
A
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T
13 14 15 16
17 18 19 20
21 223 24
When you have two or more hubs stacked together, only one hub s internal
switch is active, the others are inactive. Such design will eliminate a Loop
in the network that might cause the whole network to malfunction.
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5. Connecting the power
Connect the powercord to thepower socket onthe rear panelof the unit.
Connect the powercord to thepower outlet andturn on powerswitch. The
green Power LEDon the frontpanel should belit.
IN
OUT
Figure 5-4 Connect the power cable
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6
Trouble-shooting
1. Power LED is not lit
Check if the power cord is properly connected to the power outlet and the
hub. Make sure the power switch on the hub is turned ON. .
2. Link Status LED is not lit
Check the power switch of the network devices attached to the hub, make
sure they are turned ON.
Check the network cable, make sure it is properly connected to the hub and
the network device.
Check the network cable, make sure the cable complies with EIA/TIA 568
specification. Use straight-through Category 5 cables for 100Mbps
connection and Category 3 or higher cables for 10Mbps connection.
Check the slide switch and make sure it s in normal position when you use
the last port on the hub to connect to workstations or file servers.
3. The last port s Link Status LED is not lit when it is uplinked to
another hub
Make sure the cable is connected to the "uplink" connector.
Check the network cable, make sure it is properly connected to both hubs.
One end of the cable should be connected to uplink port while the other end
of the cable should connected to a regular port. Do not connect the cable to
both uplink ports.
Check the network cable, make sure the cable complies with EIA/TIA 568
specification. Use Category 5 cables for 100Mbps connection.
Check the network cable, make sure the maximum length does not exceed 5
meters (15ft) in 100Mbps connection and 100 meters (300ft) in 10Mbps
connection.
4. Collision LED flashes constantly
Remove all the network cables, connect the cables back one by one to
isolate the source of the collision.
Check the network cable, inferior cable quality will result in excessive
collision and error packets.
[!] Contact your dealer if problempersist.
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