Page 1
Quick Installation Guide
for 16/24/32 ports
Dual Speed Hub
ADH16SB
ADH24SB
ADH32SB
Page 2
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.
Page 3
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
Page 4
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
Page 5
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
Page 6
2
Features & Specifications
2
(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 corresponding internal
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 devices running at different speed 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
Page 7
(2) Specifications
Standards : IEEE 802.3 & 802.3u
10/100Mbps Ports : RJ45 x 16 (16-Port Rackmount Dual Speed Hub) or
RJ45 x 24 (24-Port Rackmount Dual Speed Hub) or
RJ45 x 32 (32-Port Rackmount Dual Speed Hub)
Hub LEDs : Power, Internal Switch
Segment LEDs : Collision, Utilization
Port LEDs : Speed Status(10 or 100), Link/Activity Status
Internal Switch : 1K MAC Address Table
256KB Buffer Memory
Dimensions : 17.3 x 7.9 x 1.75 in./440 x 201 x 45 mm
Weight : 5.1 lb./2.3kg
Power : 100-240V AC, 50-60Hz internal full-range switching power
Operating Temperature : 32-131 F (0-55 C)
Operating Humidity : 10-95% (Noncondensing)
Emission : FCC Class B & CE
00
4
Page 8
3
Package Contents
3
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
10M
COL
100M
Switch
1 2 3 4 5 6 7 8 9 10 11 1213 14 1516
LNK
Power
ACT
10M
COL
100M
LNK
ACT
100M
Switch
LNK
Power
ACT
10M
COL
100M
100M
Switch
Power
50+301051
% 50+301051
100M
UTIL
COL
50+30 10 5 1
% 50+ 3010 5 1
100M
UTIL
COL
1 2 3 4 5 6 7 8 9 10 1112
1314 15 1617 18 1920 21 22 2324
50+301051
% 50+301051
UTIL
1 2 3 4 5 6 7 8 9 10 1112 13 14 1516
LNK
ACT
1718 19 2021 22 23 2425 26 2728 29 30 3132
LNK
ACT
%
16-Port 10/100Mbps
UTIL
Dual Speed
Stackable Ethernet Hub
%
24-Port 10/100Mbps
UTIL
Dual Speed
Stackable Ethernet Hub
%
1 2 3 41 2 3 4
100M
32-Port 10/100Mbps
UTIL
COL
Dual Speed
Stackable Ethernet Hub
17 18 19 20
1 2 3 41 2 3 4
13 14 15 16
5 6 7 8
21 22 23 2421 22 23 24
1 2 3 4
9 10 11 12
5 6 7 8
17 18 19 2017 18 19 20
9 10 11 12
25 26 27 2825 26 27 28
5 6 7 8
13 14 15 16
9 10 11 12
21 22 23 2421 22 23 24
13 14 15 16
29 30 31 3229 30 31 32
Uplink
Uplink
Uplink
Figure 3-1 Package contents
5
Page 9
4
Physical Description
4
(1) Panel
16-Port Rackmount
Dual Speed Hub
24-Port Rackmount
Dual Speed Hub
LED Panel
50+301051
% 50+30105 1
%
10M
100M
UTIL
UTIL
COL
COL
100M
Switch
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
LNK
Power
ACT
IN OUTIN OUT
10M Col. and Util. LED
% 50+ 30 1051
10M
UTIL
COL
100M
Switch
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
LNK
Power
ACT
Internal Switch LED
Power LED
LED Panel
50+301051
% 50+30 105 1
%
10M
100M
UTIL
UTIL
COL
COL
100M
1 2 3 4 5 6 7 8 9 10 11 12
LNK
ACT
100M
Switch
13 14 15 16 17 18 19 20 21 22 23 24
LNK
Power
ACT
IN OUTIN OUT
10M Col. and Util. LED
% 50+301051
10M
UTIL
COL
100M
1 2 3 4 5 6 7 8 9 10 11 12
LNK
ACT
100M
Switch
13 14 15 16 17 18 19 20 21 22 23 24
LNK
Power
ACT
Internal Switch LED
Power LED
16-Port 10/100Mbps
Dual Speed
Stackable Ethernet Hub
Stacking ports
50+30 1051
100M
COL
24-Port 10/100Mbps
Dual Speed
Stackable Ethernet Hub
Stacking ports
50+301051
100M
COL
%
UTIL
%
UTIL
RJ45 connectors
1 2 3 4
9 10 11 12
100M Col. and Util. LED
16-Port 10/100Mbps
Dual Speed
Stackable Ethernet Hub
Link/Activity
LED
RJ45 connectors
1 2 3 41 2 3 4
5 6 7 8
13 14 15 16
17 18 19 2017 18 19 20
100M Col. and Util. LED
24-Port 10/100Mbps
Dual Speed
Stackable Ethernet Hub
Link/Activity
LED
Uplink Port
5 6 7 8
13 14 15 16
100M
LED
Uplink Port
9 10 11 12
21 22 23 2421 22 23 24
100M
LED
Uplink
Uplink
Figure 4-1 Panel description
6
Page 10
32-Port Rackmount
Dual Speed Hub
LED Panel
50+301051
% 50+301051
%
10M
100M
UTIL
UTIL
COL
COL
100M
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
LNK
ACT
Switch
100M
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
LNK
Power
ACT
IN OUTIN OUT
10M Col. and Util. LED
% 50+301051
10M
UTIL
COL
100M
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
LNK
ACT
100M
Switch
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
LNK
Power
ACT
32-Port 10/100Mbps
Stacking ports
50+301051
100M
COL
1 2 3 41 2 3 4
17 18 19 20
%
UTIL
RJ45 connectors
5 6 7 8
9 10 11 12
21 22 23 2421 22 23 24
25 26 27 2825 26 27 28
100M Col. and Util. LED
32-Port 10/100Mbps
Dual Speed
Stackable Ethernet Hub
Uplink Port
13 14 15 16
29 30 31 3229 30 31 32
100M
LED
Uplink
Internal Switch LED
Power LED
Figure 4-1 Panel description (cont.)
7
Link/Activity
LED
Page 11
(2) LED
LED Color Status Description Number of LED
PWR
(Power)
Switch
(Internal Switch)
COL
(Segment
Collision)
UTIL.
(Segment
Utilization)
LNK/ACT
(Link/Activity)
100Mbps
Green
Green
Yellow
Green
Green
Green
Lit
Off
Lit
Off
Lit
Off
Lit
Lit
Power is supplied
No power
The internal switch is active
The internal switch is inactive
Collision detected in this segment
No Collision
Indicate network utilization
A valid link is established
Flash
Off
Lit
Off
No link is established
This port run at 100Mbps
Not connected or run at 10M
Table 4-1 LED description
One for the whole Hub
One for the whole Hub
One for 10Mbps
segment and one for
100Mbps segment
One set for 10Mbps
segment and one set for
100Mbps segment
One for each portData packets received
One for each port
8
Page 12
5
Installation
5
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 reduce humidity.
2. Connecting to network 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) should also be lit.
Switch
Power
% 50+ 30 10 5 1
10M
UTIL
COL
100M
1 2 3 4 5 6 7 8 9 10 11 12
LNK
ACT
100M
1314 15 16 1718 19 20 2122 23 24
LNK
ACT
50+30 10 5 1
100M
Dual Speed Hub
%
24-Port 10/100Mbps
UTIL
COL
Dual Speed
Stackable Ethernet Hub
Category 5
1 2 3 41 2 3 4
13 14 15 16
5 6 7 8
17 18 19 2017 18 19 20
9 10 11 12
21 22 23 2421 22 23 24
Uplink
Category 5
EIA/TIA 568
EIA/TIA 568
UTP Cable
UTP Cable
100m
100m
Figure 5-1 Connect the hub and network device
Network
Network
Adapter
Adapter
10/100 FAST ETHERNET CARD
10/100 FAST ETHERNET CARD
10/100 FAST ETHERNET CARD
FCC ID :
FCC ID :
FCC ID :
RTL8139
RTL8139
RTL8139
3. Uplink to Another Hub
Use the uplink port (the last port) to connect to another hub as illustrated
in Figure 5-2. Connecting cable must comply with EIA/TIA 568
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 two hubs will be set at 100Mbps and the green Speed (100M)
LED should be lit. The maximum length of the cable should not exceed 5
meters (15ft) when connecting two hubs running at 100Mbps and 100
meters (300ft) when connecting two hubs running at 10Mbps.
9
Page 13
Uplink Port
Uplink
%
24-Port 10/100Mbps
UTIL
Dual Speed
Stackable Ethernet Hub
Dual Speed Hub
1 2 3 41 2 3 4
5 6 7 8
13 14 15 16
17 18 19 2017 18 19 20
9 10 11 12
21 22 23 2421 22 23 24
Uplink
Switch
Power
% 50+301051
10M
UTIL
COL
100M
1 2 3 4 5 6 7 8 9 10 1112
LNK
ACT
100M
1314 15 1617 18 1920 21 22 2324
LNK
ACT
50+301051
100M
COL
Uplink Port
50+30 10 51
% 50+30 10 5 1
%
10M
Switch
Power
UTIL
COL
100M
1 2 3 4 5 6 7 8 9 10 1112
LNK
ACT
100M
1314 15 1617 18 1920 21 22 2324
LNK
ACT
100M
24-Port 10/100Mbps
UTIL
COL
Dual Speed
Stackable Ethernet Hub
1 2 3 41 2 3 4
13 14 15 16
5 6 7 8
17 18 19 2017 18 19 20
Normal Port
9 10 11 12
21 22 23 2421 22 23 24
Uplink
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
Internal
Switch
Switch
50+30 10 5 1
% 50+ 3010 5 1
%
50+301051
% 50+301051
%
1 2 3 41 2 3 4
5 6 7 8
9 10 11 12
1 2 3 41 2 3 4
5 6 7 8
10M
10M
UTIL
UTIL
COL
COL
100M
100M
12 3 4 5 6 78 9 10 1112
12 3 4 5 6 78 9 10 1112
LNK
LNK
ACT
ACT
100M
100M
Switch
Switch
1314 1516 1718 1920 2122 2324
1314 1516 1718 1920 2122 2324
LNK
LNK
Power
Power
ACT
ACT
% 50+301051
% 50+301051
10M
10M
UTIL
UTIL
COL
COL
100M
100M
12 3 4 5 6 78 9 10 1112
12 3 4 5 6 78 9 10 1112
LNK
LNK
ACT
ACT
100M
100M
Switch
Switch
1314 1516 1718 1920 2122 2324
1314 1516 1718 1920 2122 2324
LNK
LNK
Power
Power
ACT
ACT
% 50+301051
% 50+301051
10M
10M
UTIL
UTIL
COL
COL
100M
100M
12 3 4 5 6 78 9 10 1112
12 3 4 5 6 78 9 10 1112
LNK
LNK
ACT
ACT
100M
100M
Switch
Switch
1314 1516 1718 1920 2122 2324
1314 1516 1718 1920 2122 2324
LNK
LNK
Power
Power
ACT
ACT
% 50+301051
% 50+301051
10M
10M
UTIL
UTIL
COL
COL
100M
100M
12 3 4 5 6 78 9 10 1112
12 3 4 5 6 78 9 10 1112
LNK
LNK
ACT
ACT
100M
100M
Switch
Switch
1314 1516 1718 1920 2122 2324
1314 1516 1718 1920 2122 2324
LNK
LNK
Power
Power
ACT
ACT
% 50+301051
% 50+301051
10M
10M
UTIL
UTIL
COL
COL
100M
100M
12 3 4 5 6 78 9 10 1112
12 3 4 5 6 78 9 10 1112
LNK
LNK
ACT
ACT
100M
100M
Switch
Switch
1314 1516 1718 1920 2122 2324
1314 1516 1718 1920 2122 2324
LNK
LNK
Power
Power
ACT
ACT
% 50+301051
% 50+301051
10M
10M
UTIL
UTIL
COL
COL
100M
100M
12 3 4 5 6 78 9 10 1112
12 3 4 5 6 78 9 10 1112
LNK
LNK
ACT
ACT
100M
100M
Switch
Switch
1314 1516 1718 1920 2122 2324
1314 1516 1718 1920 2122 2324
LNK
LNK
Power
Power
ACT
ACT
100M
100M
24-Port 10/100Mbps
24-Port 10/100Mbps
UTIL
UTIL
COL
COL
Dual Speed
Dual Speed
Stackable Ethernet Hub
Stackable Ethernet Hub
50+301051
%
50+301051
%
100M
100M
24-Port 10/100Mbps
24-Port 10/100Mbps
UTIL
UTIL
COL
COL
Dual Speed
Dual Speed
Stackable Ethernet Hub
Stackable Ethernet Hub
50+301051
%
50+301051
%
100M
100M
24-Port 10/100Mbps
24-Port 10/100Mbps
UTIL
UTIL
COL
COL
Dual Speed
Dual Speed
Stackable Ethernet Hub
Stackable Ethernet Hub
50+301051
%
50+301051
%
100M
100M
24-Port 10/100Mbps
24-Port 10/100Mbps
UTIL
UTIL
COL
COL
10Mbps
10Mbps
Dual Speed
Dual Speed
Stackable Ethernet Hub
Stackable Ethernet Hub
50+301051
%
50+301051
%
100M
100M
24-Port 10/100Mbps
24-Port 10/100Mbps
UTIL
UTIL
COL
COL
Dual Speed
Dual Speed
Stackable Ethernet Hub
Stackable Ethernet Hub
50+301051
%
50+301051
%
100M
100M
24-Port 10/100Mbps
24-Port 10/100Mbps
UTIL
UTIL
COL
COL
Dual Speed
Dual Speed
Stackable Ethernet Hub
Stackable Ethernet Hub
13 14 15 16
13 14 15 16
1 2 3 41 2 3 4
1 2 3 41 2 3 4
13 14 15 16
13 14 15 16
1 2 3 41 2 3 4
1 2 3 41 2 3 4
13 14 15 16
13 14 15 16
1 2 3 41 2 3 4
1 2 3 41 2 3 4
100 Mbps
100 Mbps
13 14 15 16
13 14 15 16
1 2 3 41 2 3 4
1 2 3 41 2 3 4
13 14 15 16
13 14 15 16
1 2 3 41 2 3 4
1 2 3 41 2 3 4
13 14 15 16
13 14 15 16
17 18 19 2017 18 19 20
17 18 19 2017 18 19 20
5 6 7 8
5 6 7 8
17 18 19 2017 18 19 20
17 18 19 2017 18 19 20
5 6 7 8
5 6 7 8
17 18 19 2017 18 19 20
17 18 19 2017 18 19 20
5 6 7 8
5 6 7 8
17 18 19 2017 18 19 20
17 18 19 2017 18 19 20
5 6 7 8
5 6 7 8
17 18 19 2017 18 19 20
17 18 19 2017 18 19 20
5 6 7 8
5 6 7 8
17 18 19 2017 18 19 20
17 18 19 2017 18 19 20
9 10 11 12
21 22 23 2421 22 23 24
21 22 23 2421 22 23 24
9 10 11 12
9 10 11 12
21 22 23 2421 22 23 24
21 22 23 2421 22 23 24
9 10 11 12
9 10 11 12
21 22 23 2421 22 23 24
21 22 23 2421 22 23 24
9 10 11 12
9 10 11 12
21 22 23 2421 22 23 24
21 22 23 2421 22 23 24
9 10 11 12
9 10 11 12
21 22 23 2421 22 23 24
21 22 23 2421 22 23 24
9 10 11 12
9 10 11 12
21 22 23 2421 22 23 24
21 22 23 2421 22 23 24
Uplink
Uplink
Uplink
Uplink
Uplink
Uplink
Uplink
Uplink
Uplink
Uplink
Figure 5-3 Stack 6 hubs together
Uplink
Uplink
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.
10
Page 14
5. Connecting the power
Connect the power cord to the power socket on the rear panel of the unit.
Connect the power cord to the power outlet and turn on power switch. The
green Power LED on the front panel should be lit.
IN OUTIN OUT
Figure 5-4 Connect the power cable
11
Page 15
6
Trouble-shooting
6
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 problem persist.
12
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