Alfa Network Dual Speed Hub 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 notoccur in aparticular 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 ofthe 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 hasthe 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/ televisiontechnician for additionalsuggestion.
CAUTION : The phonejack cannot beconnected to telephonesystem.

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
Contents

1
1Introduction
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 oneinternal 2-port switch.
Typically adual-speed hub hastwo independent internalnetwork 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 both10Base-T and 100Base-TXnetworks.
100Mbps10Mbps
1234
5678
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100M
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Switch
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%100M
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24-Port10/100MbpsDual Speed Stackable Ethernet Hub with Internal Switch
100Mbps100Mbps10Mbps10Mbps
1234
5678
910 11 12
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17 18 19 20
21 22 23 24 Uplink
LNK/ACT
100M
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Power
Switch
10M
COL 50+3010531
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%100M
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24-Port10/100MbpsDual Speed Stackable Ethernet Hub with Internal Switch
1
Figure 1-1 10Mbps segmentconnecting
10Mbps devices
Figure 1-2 100Mbps segmentconnecting
100Mbps devices
10Mbps
10Mbps
10Mbps
10Mbps
100Mbps
100Mbps
100Mbps
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 Dual-
Speed hub withinternal switching functionis illustrated asin Figure 1-3:
When you readyto expand your network, the Uplinkport 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 to6 hubs toform 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).
Figure 1-3 Internal switchlinks 10Mbps and
100Mbps segments
100Mbps10Mbps
10Mbps
100Mbps 10Mbps
Internal
Switch
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5678
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Power
Switch
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COL 50+3010531
UTIL
%100M
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24-Port10/100MbpsDual Speed Stackable Ethernet Hub with Internal Switch
100Mbps
2

2
2Features & Specifications
(1) Features
Consists of oneinternal 10Mbps Ethernetsegment and oneinternal
100Mbps Fast Ethernetsegment.
Supports Auto-Sensing RJ45ports which automaticallysense and
select optimum speedand route datatraffic to correspondinginternal
segments.
Built-in Uplink selectionfor the lastport to connectwith regular
straight-through cable toanother hub.
Network Utilization LEDsprovides simple readingon hub straffic
status.
Built-in internal switchingfunction automatically switchesdata
traffic between devicesrunning at differentspeed establishes
communications between portsrunning at 10Mbpsand 100Mbps.
Support stackable functionfor stacking upto 6 hubsto form a
logically single dual-speedhub.
Standard 19" RackMountable
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, InternalSwitch
Segment LEDs :Collision, Utilization
Port LEDs :Speed Status(10 or100), Link/Activity Status
Internal Switch :1K MAC AddressTable
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
00
Operating Temperature: 32-131 F (0-55 C)
Operating Humidity :10-95% (Noncondensing)
Emission : FCCClass B &CE
4

5
3
3Package Contents
One Stackable Dual-Speed Hub
One power cord
User s manual
Stacking Cable
Rackmountaccessories
16-Port Rackmount
Dual Speed hub
24-Port Rackmount
Dual Speed hub
32-Port Rackmount
Dual Speed hub
LNK
ACT
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LNK
ACT
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10M
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100M
COL
Power
Switch
24-Port10/100Mbps
Dual Speed
Stackable Ethernet Hub
12341234
13 14 15 16
5678
17 18 19 2017 18 19 20
910 11 12
21 22 23 2421 22 23 24
Uplink
LNK
ACT
100M
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LNK
ACT
100M
10M
COL
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UTIL
%50+301051
UTIL
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100M
COL
Power
Switch
32-Port10/100Mbps
Dual Speed
Stackable Ethernet Hub
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910 11 12
25 26 27 2825 26 27 28
Uplink
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Dual Speed
Stackable Ethernet Hub
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Uplink
Figure 3-1 Package contents

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Power
Switch
24-Port10/100Mbps
Dual Speed
Stackable Ethernet Hub
IN OUTIN OUT
LNK
ACT
100M
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LNK
ACT
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10M
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100M
COL
Power
Switch
24-Port10/100Mbps
Dual Speed
Stackable Ethernet Hub
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17 18 19 2017 18 19 20
910 11 12
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Uplink
Power
Switch
LNK
ACT
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10M
COL
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UTIL
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100M
COL 16-Port10/100Mbps
Dual Speed
Stackable Ethernet Hub
Power
Switch
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ACT
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10M
COL
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Dual Speed
Stackable Ethernet Hub
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Uplink
IN OUTIN OUT
4
4Physical Description
Figure 4-1 Panel description
(1)Panel
6
LED Panel RJ45 connectors Uplink Port
10M Col. and Util.LED 100M Col. and Util.LED
Power LED
100M
LED
Link/Activity
LED
16-Port Rackmount
Dual Speed Hub Stacking ports
Internal Switch LED
LED Panel RJ45 connectors Uplink Port
10M Col. and Util.LED 100M Col. and Util.LED
Power LED
100M
LED
Link/Activity
LED
24-Port Rackmount
Dual Speed Hub Stacking ports
Internal Switch LED

LNK
ACT
100M
12345678910 11 12 13 14 15 16
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
LNK
ACT
100M
10M
COL
50+301051
UTIL
%50+301051
UTIL
%
100M
COL
Power
Switch
32-Port10/100Mbps
Dual Speed
Stackable Ethernet Hub
5678
21 22 23 2421 22 23 24
910 11 12
25 26 27 2825 26 27 28
Uplink
Power
Switch
LNK
ACT
100M
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17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
LNK
ACT
100M 32-Port 10/100Mbps
10M
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IN OUTIN OUT
Figure 4-1 Panel description (cont.)
7
LED Panel RJ45 connectors Uplink Port
10M Col. and Util.LED 100M Col. and Util.LED
Power LED
100M
LED
Link/Activity
LED
32-Port Rackmount
Dual Speed Hub Stacking ports
Internal Switch LED

Switch
(Internal Switch)Green
Lit
Off
The internal switch isactive
One for thewhole Hub
The internal switch isinactive
(2)LED
Table4-1 LED description
8
LED Color Status Description Number of LED
PWR
(Power)
LNK/ACT
(Link/Activity)
100Mbps
COL
(Segment
Collision)
UTIL.
(Segment
Utilization)
Green
Green
Green
Yellow
Green
Lit
Off
Lit
Off
Lit
Off
Flash
Lit
Off
Lit
Power is supplied
One for thewhole Hub
No power
A valid linkis established
One for each portData packets received
No link isestablished
This port runat 100Mbps
One for each port
Not connected orrun at 10M
Collision detected inthis segment One for 10Mbps
segment and onefor
100Mbps segment
No Collision
Indicate network utilization
One set for10Mbps
segment and oneset for
100Mbps segment

5
5Installation
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.
3. Uplink toAnother Hub
Use the uplinkport (the lastport) to connectto another hubas illustrated
in Figure 5-2. Connecting cable must comply with EIA/TIA 568
specifications and Category5 (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.
Figure 5-1 Connect the huband network device
Dual Speed Hub
10/100 FAST ETHERNET CARD
FCC ID :
RTL8139
100m
Category 5
EIA/TIA 568
UTP Cable
Network
Adapter
10/100 FAST ETHERNET CARD
FCC ID :
RTL8139
10/100 FAST ETHERNET CARD
FCC ID :
RTL8139
100m
Category 5
EIA/TIA 568
UTP Cable
Network
Adapter
LNK
ACT
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ACT
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Power
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Dual Speed
Stackable Ethernet Hub
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Uplink
9

4. Stacking HubsTogether
These Dual SpeedHubs provide twostacking ports. Usersmay connect two
hubs using thesupplied stacking cable.Connect one endof the stacking
cable to the IN stacking connectorof the huband the otherend of the
stacking cable toanother hub OUT stacking connector.Youmay stack upto
10 hubs. Thehubs cascaded togetherthrough stacking portsare in one
collision domain andtherefore considered asone logical dualspeed hub.
When you havetwo or morehubs stacked together, only onehub s internal
switch is active,the others areinactive. Such designwill eliminate a Loop
in the networkthat might causethe whole networkto malfunction.
LNK
ACT
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ACT
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10M
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Power
Switch
24-Port10/100Mbps
Dual Speed
Stackable Ethernet Hub
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Uplink
LNK
ACT
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LNK
ACT
100M
10M
COL
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%50+301051
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COL
Power
Switch
24-Port10/100Mbps
Dual Speed
Stackable Ethernet Hub
12341234
13 14 15 16
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Uplink
Figure 5-2 Uplink toanother hub
Uplink Port
Dual Speed Hub
Uplink Port
Normal Port
Uplink
Figure 5-3 Stack 6hubs together
LNK
ACT
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ACT
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10M
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Power
Switch
24-Port10/100Mbps
Dual Speed
Stackable Ethernet Hub
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5678
17 18 19 2017 18 19 20
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21 22 23 2421 22 23 24
Uplink
LNK
ACT
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ACT
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10M
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COL
Power
Switch
24-Port10/100Mbps
Dual Speed
Stackable Ethernet Hub
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17 18 19 2017 18 19 20
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Uplink
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ACT
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ACT
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10M
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Power
Switch
24-Port10/100Mbps
Dual Speed
Stackable Ethernet Hub
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Uplink
LNK
ACT
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ACT
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Power
Switch
24-Port10/100Mbps
Dual Speed
Stackable Ethernet Hub
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910 11 12
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Uplink
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ACT
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Power
Switch
24-Port10/100Mbps
Dual Speed
Stackable Ethernet Hub
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17 18 19 2017 18 19 20
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Uplink
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Power
Switch
24-Port10/100Mbps
Dual Speed
Stackable Ethernet Hub
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Uplink
10Mbps 100Mbps
Internal
Switch
LNK
ACT
100M
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ACT
100M
10M
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%50+301051
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Power
Switch
24-Port10/100Mbps
Dual Speed
Stackable Ethernet Hub
12341234
13 14 15 16
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17 18 19 2017 18 19 20
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21 22 23 2421 22 23 24
Uplink
LNK
ACT
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13 14 15 16 17 18 19 20 21 22 23 24
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ACT
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10M
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Power
Switch
24-Port10/100Mbps
Dual Speed
Stackable Ethernet Hub
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17 18 19 2017 18 19 20
910 11 12
21 22 23 2421 22 23 24
Uplink
LNK
ACT
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ACT
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10M
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%50+301051
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Power
Switch
24-Port10/100Mbps
Dual Speed
Stackable Ethernet Hub
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17 18 19 2017 18 19 20
910 11 12
21 22 23 2421 22 23 24
Uplink
LNK
ACT
100M
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ACT
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10M
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Power
Switch
24-Port10/100Mbps
Dual Speed
Stackable Ethernet Hub
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13 14 15 16
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17 18 19 2017 18 19 20
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21 22 23 2421 22 23 24
Uplink
LNK
ACT
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13 14 15 16 17 18 19 20 21 22 23 24
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ACT
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10M
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100M
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Power
Switch
24-Port10/100Mbps
Dual Speed
Stackable Ethernet Hub
12341234
13 14 15 16
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17 18 19 2017 18 19 20
910 11 12
21 22 23 2421 22 23 24
Uplink
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ACT
100M
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13 14 15 16 17 18 19 20 21 22 23 24
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ACT
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10M
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%50+301051
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Power
Switch
24-Port10/100Mbps
Dual Speed
Stackable Ethernet Hub
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Uplink
10Mbps 100Mbps
Internal
Switch
10

11
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.
Figure 5-4 Connect thepower cable
IN OUTIN OUT

6
6Trouble-shooting
1. Power LEDis not lit
Check if thepower cord isproperly connected tothe power outletand the
hub. Make surethe power switchon the hubis turned ON..
2. Link StatusLED is notlit
Check the powerswitch of thenetwork devices attachedto the hub,make
sure they areturned ON.
Check the networkcable, make sureit is properlyconnected to thehub and
the network device.
Check the networkcable, make surethe cable complieswith EIA/TIA 568
specification. Use straight-throughCategory 5 cablesfor 100Mbps
connection and Category3 or highercables for 10Mbpsconnection.
Check the slideswitch and makesure it sin normal positionwhen you use
the last porton the hubto connect toworkstations or fileservers.
3. The lastport s LinkStatus LED isnot lit when it is uplinkedto
another hub
Make sure thecable is connectedto the "uplink"connector.
Check the networkcable, make sureit is properlyconnected to bothhubs.
One end ofthe cable shouldbe connected touplink port whilethe other end
of the cableshould connected toa regular port.Do not connectthe cable to
both uplink ports.
Check the networkcable, make surethe cable complieswith EIA/TIA 568
specification. Use Category5 cables for100Mbps connection.
Check the networkcable, make surethe maximum lengthdoes not exceed5
meters (15ft) in100Mbps connection and100 meters (300ft)in 10Mbps
connection.
4. Collision LEDflashes constantly
Remove all thenetwork cables, connectthe cables backone by oneto
isolate the sourceof the collision.
Check the networkcable, inferior cablequality will resultin excessive
collision and errorpackets.
[!] Contact yourdealer if problempersist.
12