Allied Telesis Switch AT GS950 16 10 User Manual

Gigabit Ethernet  
Smart Switches  
AT-GS950/16  
AT-GS950/24  
Installation Guide  
613-000190 Rev. B  
 
Electrical Safety and Emissions Standards  
This product meets the following standards.  
U.S. Federal Communications Commission  
Radiated Energy  
Note: This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15  
of FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the  
equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency  
energy and, if not installed and used in accordance with this instruction manual, may cause harmful interference to radio  
communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case  
the user will be required to correct the interference at his own expense.  
Note: Modifications or changes not expressly approved of by the manufacturer or the FCC, can void your right to operate  
this equipment.  
Industry Canada  
This Class A digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.  
Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada.  
RFI Emissions  
FCC Class A, EN55022 Class A, EN61000-3-2, EN61000-3-3, C-TICK,  
CE  
Warning: In a domestic environment this product may cause radio interference in  
which case the user may be required to take adequate measures.  
Immunity  
EN55024  
Electrical Safety  
EN60950 (TUV), UL 60950 (CULUS)  
Laser Safety  
EN60825  
3
 
Translated Safety Statements  
Important: The indicates that a translation of the safety statement is available in a PDF  
document titled “Translated Safety Statements” (613-000405) posted on the Allied Telesis website at  
4
 
Contents  
Preface ................................................................................................................................................................................11  
Chapter 1: Overview ..........................................................................................................................................................15  
Chapter 2: Installation .......................................................................................................................................................25  
Chapter 3: Troubleshooting ..............................................................................................................................................39  
Appendix A: Technical Specifications .............................................................................................................................41  
5
 
Contents  
6
 
Figures  
7
 
Figures  
8
 
Tables  
10  
 
Preface  
This guide contains installation instructions for the AT-GS950/16 and  
AT-GS950/24 Gigabit Ethernet Smart Switches. This preface contains the  
following sections:  
11  
 
 
Preface  
Safety Symbols Used in this Document  
This document uses the safety symbols defined in Table 1.  
Table 1. Safety Symbols  
Symbol Meaning  
Description  
Caution  
Performing or omitting a specific action may  
result in equipment damage or loss of data.  
Warning  
Performing or omitting a specific action may  
result in electrical shock.  
12  
 
   
AT-GS950/16 and AT-GS950/24 Gigabit Ethernet Smart Switches Installation Guide  
Where to Find Web-based Guides  
The installation and user guides for all Allied Telesis products are available  
in portable document format (PDF) on our web site at  
www.alliedtelesis.com. You can view the documents online or download  
them onto a local workstation or server.  
13  
 
 
Preface  
Contacting Allied Telesis  
This section provides Allied Telesis contact information for technical  
support as well as sales and corporate information.  
Online Support You can request technical support online by accessing the Allied Telesis  
Knowledge Base: www.alliedtelesis.com/support/kb.aspx. You can use  
the Knowledge Base to submit questions to our technical support staff and  
review answers to previously asked questions.  
Email and For Technical Support via email or telephone, refer to the Support section  
of the Allied Telesis web site: www.alliedtelesis.com.  
Telephone  
Support  
Returning Products for return or repair must first be assigned a return materials  
authorization (RMA) number. A product sent to Allied Telesis without an  
Products  
RMA number will be returned to the sender at the sender’s expense. For  
instructions on how to obtain an RMA number, go to the Support section  
on our web site at www.alliedtelesis.com.  
Sales or You can contact Allied Telesis for sales or corporate information through  
our web site at www.alliedtelesis.com.  
Corporate  
Information  
Warranty The AT-GS950/16 and AT-GS950/24 Switches have a Lifetime Warranty  
(24 Months Fan and PSU). Go to www.alliedtelesis.com/warranty for  
the terms and conditions of the warranty and for warranty registration.  
Management New releases of the management software for our managed products are  
available from the following Internet sites:  
Software Updates  
ˆ Allied Telesis web site: www.alliedtelesis.com  
ˆ Allied Telesis FTP server: ftp://ftp.alliedtelesis.com  
If the FTP server prompts you to log on, enter “anonymous” as the user  
name and your email address as the password.  
14  
 
               
Chapter 1  
Overview  
This chapter describes the AT-GS950/16 and AT-GS950/24 Layer 2  
Gigabit Ethernet Switches. The sections in the chapter are.  
15  
 
   
Chapter 1: Overview  
Features  
The features of the AT-GS950/16 and AT-GS950/24 Gigabit Ethernet  
Switches include:  
ˆ LEDs for unit and port status  
ˆ 16 or 24 Auto-Negotiating 10/100/1000Base-T twisted pair ports with  
RJ-45 connectors  
ˆ Two small form-factor pluggable (SFP) ports  
ˆ Auto MDI/MDI-X on the twisted pair ports  
ˆ IEEE 802.3 and IEEE 802.3u compliant  
ˆ IEEE 802.3x flow control in full-duplex operation; back pressure in  
half-duplex operation  
ˆ IEEE 802.1P based Quality of Service support  
ˆ IEEE 802.1Q based tagged VLAN support  
ˆ IEEE 802.1X based authentication  
ˆ Port mirroring  
ˆ Link aggregation  
ˆ Store and forward switching mode  
ˆ Dynamic Host Configuration Protocol (DHCP) client  
ˆ 8K MAC address table with automatic aging  
ˆ Menus- and web-based configuration using the AT-S79 management  
software  
16  
 
 
AT-GS950/16 and AT-GS950/24 Gigabit Ethernet Smart Switches Installation Guide  
Front and Back Panels  
Figure 1 illustrates the front panels of the AT-GS950/16 and AT-GS950/24  
Gigabit Ethernet Switches.  
AT-GS950/16  
AT-GS950/16  
16-Port 10/100/1000Mbps  
11 13 15  
+
2
SFP Combo WebSmart Switch  
1
3
5
7
9
SPEED  
LINK/ACT  
SPEED  
LINK/ACT  
LINK/ACT  
15 16  
POWER  
2
4
6
8
10 12 14 16  
1295  
10/100/1000Base  
Twisted Pair Ports  
SFP Ports  
Port and System LEDs  
Console Port  
AT-GS950/24  
AT-GS950/24  
24-Port 10/100/1000Mbps  
+
2
SFP Combo WebSmart Switch  
1
3
5
7
9
11 13 15 17 19 21 23  
SPEED  
LINK/ACT  
SPEED  
LINK/ACT  
LINK/ACT  
POWER  
2
4
6
8
10 12 14 16 18 20 22 24  
23 24  
1296  
Port and System LEDs  
SFP Ports  
Console Port  
10/100/1000Base Twisted Pair Ports  
Figure 1. AT-GS950/16 and AT-GS950/24 Front Panels  
Figure 2 illustrates the back panel of the switches.  
AT-GS950/16 and AT-GS950/24  
733  
Figure 2. AT-GS950/16 and AT-GS950/24 Back Panels  
17  
 
     
Chapter 1: Overview  
Ports  
The AT-GS950/16 and AT-GS950/24 Layer 2 Gigabit Ethernet Switches  
feature 16 or 24 twisted pair ports and two slots for optional SFP  
transceivers.  
Twisted Pair The twisted pair ports are 10Base-T, 100Base-TX, and 1000Base-TX  
compliant. They automatically set their speed and duplex mode with IEEE  
802.3u Auto-Negotiation. If desired, you can disable Auto-Negotiation on a  
port and manually set the speed and duplex mode.  
Ports  
Note  
If a switch port is connected to an end node that is not using Auto-  
Negotiation, you should disable Auto-Negotiation on the port and set  
its speed and duplex mode manually. Otherwise, a duplex mode  
mismatch might occur.  
The twisted pair ports feature 8-pin RJ-45 connectors. For the port  
The ports have a maximum operating distance of 100 m  
(328 feet). For 10 Mbps operation, the ports require Category 3 or better  
100 ohm shielded or unshielded twisted pair cabling. For 100 or 1000  
Mbps operation, the ports require Category 5 or Enhanced Category 5  
(5E) 100 ohm shielded or unshielded twisted pair cabling.  
Also featured on the ports is auto-MDI, which automatically configures the  
ports as MDI or MDI-X. This allows you to use straight-through twisted pair  
cable regardless of the configuration of the ports on the end nodes.  
Uplink Combo The switch has two pairs of uplink ports, each consisting of one 10/100/  
1000Base-T twisted pair port and one slot for an optional SFP transceiver.  
The ports are numbered 15 and 16 on the AT-GS950/16 Switch and 23  
and 24 on the AT-GS950/24 Switch.  
Ports  
You can use one port in a combo pair at a time. A link on an SFP  
transceiver takes precedence over a link on a 10/100/1000Base-T twisted  
pair port in the same combo pair. If the SFP slot is empty or if it has an  
SFP module but the module does not have a link to an end node, the  
10/100/1000Base-T twisted pair port of the pair is active. If an SFP  
transceiver is installed and has a link to an end node, the twisted pair port  
in the pair is inactive.  
RS-232 Console The RS-232 console port is for local management of the switch with the  
AT-S79 Management Software. Local management uses the  
management cable supplied with the switch.  
Port  
18  
 
       
AT-GS950/16 and AT-GS950/24 Gigabit Ethernet Smart Switches Installation Guide  
LEDs  
The LEDs shown in Figure 3 display system and port status information.  
AT-GS950/16  
AT-GS950/16  
16-Port 10/100/1000Mbps + 2 SFP Combo WebSmart Switch  
11 13 15  
1
3
5
7
9
SPEED  
LINK/ACT  
SPEED  
LINK/ACT  
LINK/ACT  
POWER  
2
4
6
8
10 12 14 16  
15 16  
1297  
AT-GS950/24  
AT-GS950/24  
24-Port 10/100/1000Mbps + 2 SFP Combo WebSmart Switch  
11 13 15 17 19 21 23  
1
3
5
7
9
SPEED  
LINK/ACT  
SPEED  
LINK/ACT  
LINK/ACT  
POWER  
23 24  
2
4
6
8
10 12 14 16 18 20 22 24  
1298  
Figure 3. AT-GS950/16 and AT-GS950/24 System and Port LEDs  
Table 2 describes the system LEDs.  
Table 2. System LEDs  
LED  
State  
Description  
POWER  
Off  
On  
The switch is not receiving power.  
The switch is receiving power.  
Table 3 describes the LEDs for the 10/100/1000Base-T ports.  
Table 3. 10/100/1000Base-T Port LEDs  
LED  
State  
Description  
SPEED  
On  
Off  
The port is operating at 1000 Mbps.  
The port is operating at 10/100 Mbps or no  
link is established.  
19  
 
       
Chapter 1: Overview  
Table 3. 10/100/1000Base-T Port LEDs (Continued)  
LED  
State  
Description  
LINK/ACT Off  
The port has not established a link with an  
end node.  
Blinking  
The port is transmitting or receiving data.  
Green  
Green  
A valid link has been established on the port.  
Table 4 describes the LEDs for the SFP ports.  
Table 4. SFP Port LEDs  
LED  
State  
Description  
LINK/ACT Off  
The port has not established a link with an  
end node.  
Blinking  
The port is transmitting or receiving data.  
Green  
Green  
A valid link has been established on the port.  
20  
 
 
AT-GS950/16 and AT-GS950/24 Gigabit Ethernet Smart Switches Installation Guide  
Power Supply  
The switches have an internal power supply with a single AC power supply  
socket on the back panel which features autoswitch AC inputs. To power  
the switch on or off, connect or disconnect the power cord provided with  
the switch. A power cord is supplied with the switch.  
Note  
For the power requirements, refer to “Power Specifications” on  
21  
 
 
Chapter 1: Overview  
Network Topologies  
This section illustrates two network topologies of the AT-GS950/16 and  
AT-GS950/24 Layer 2 Gigabit Ethernet Switches: a power workgroup and  
collapsed backbone.  
Power The topology shown in Figure 4 is commonly referred to as a power  
workgroup topology. This topology provides the best in performance and  
reliability because each end node is connected directly to the AT-GS950/  
24 Switch with a dedicated network link.  
Workgroup  
Topology  
AT-GS950/24 Switch  
AT-GS950/24  
24-Port 10/100/1000Mbps SFP Combo WebSmart Switch  
+
2
1
3
5
7
9
11 13 15 17 19 21 23  
SPEED  
LINK/ACT  
SPEED  
LINK/ACT  
LINK/ACT  
POWER  
2
4
6
8
10 12 14 16 18 20 22 24  
2
3
2
4
1296  
Legend  
100 Mbps  
1000 Mbps  
Figure 4. Power Workgroup Topology  
22  
 
     
AT-GS950/16 and AT-GS950/24 Gigabit Ethernet Smart Switches Installation Guide  
Collapsed In the topology illustrated in Figure 5 the AT-GS950/16 is connected to  
other managed and unmanaged Ethernet switches to form a collapsed  
Backbone  
backbone topology. The AT-GS950/16 Switch functions as the focal point  
of the network by transferring Ethernet frames between the switches. This  
topology reduces the amount of unnecessary traffic in each workgroup,  
because the AT-GS950/16 Switch transfers frames only when the source  
and destination end nodes are located on different switches. This frees up  
bandwidth and improves network performance  
AT-GS950/16 Switch  
AT-GS950/16  
16-Port 10/100/1000Mbps  
11 13 15  
+
2
SFP Combo WebSmart Switch  
1
3
5
7
9
SPEED  
LINK/ACT  
SPEED  
LINK/ACT  
LINK/ACT  
15 16  
POWER  
2
4
6
8
10 12 14 16  
1295  
AT-GS900/8E Switch  
AT-GS900/16 Switch  
AT-G  
S
h
900/8E  
10M  
1
0
/1  
0
0
/1  
0
0
0
B
A
S
E
-T  
G
igabit  
E
therne  
t
S
witc  
1000M  
100M  
LINK/ACT  
FDX  
POWER  
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
561  
601  
600  
AT-GS900/24 Switch  
Legend  
10 Mbps  
100 Mbps  
1000 Mbps  
Figure 5. Collapsed Backbone Topology  
23  
 
   
Chapter 1: Overview  
24  
 
Chapter 2: Installation  
Reviewing Safety Precautions  
Please review the following safety precautions before you begin to install  
the chassis or any of its components.  
Note  
The indicates that a translation of the safety statement is  
available in a PDF document titled “Translated Safety Statements”  
(613-000405) posted on the Allied Telesis website at  
Warning: To prevent electric shock, do not remove the cover. No  
user-serviceable parts inside. This unit contains hazardous  
voltages and should only be opened by a trained and qualified  
technician. To avoid the possibility of electric shock, disconnect  
electric power to the product before connecting or disconnecting  
the LAN cables. E1  
Warning: Do not work on equipment or cables during periods of  
lightning activity. E2  
Warning: Power cord is used as a disconnection device. To de-  
energize equipment, disconnect the power cord. E3  
Warning: Class I Equipment. This equipment must be earthed.  
The power plug must be connected to a properly wired earth  
ground socket outlet. An improperly wired socket outlet could  
place hazardous voltages on accessible metal parts. E4  
Pluggable Equipment. The socket outlet shall be installed near  
the equipment and shall be easily accessible. E5  
Caution: Air vents must not be blocked and must have free  
access to the room ambient air for cooling. E6  
Warning: Operating Temperature. This product is designed for a  
maximum ambient temperature of 40° degrees C. E7  
All Countries: Install product in accordance with local and  
National Electrical Codes. E8  
26  
 
 
AT-GS950/16 and AT-GS950/24 Gigabit Ethernet Smart Switches Installation Guide  
Circuit Overloading: Consideration should be given to the  
connection of the equipment to the supply circuit and the effect  
that overloading of circuits might have on overcurrent protection  
and supply wiring. Appropriate consideration of equipment  
nameplate ratings should be used when addressing this  
concern. E21  
Warning: Mounting of the equipment in the rack should be such  
that a hazardous condition is not created due to uneven  
mechanical loading. E25  
If installed in a closed or multi-unit rack assembly, the operating  
ambient temperature of the rack environment may be greater  
than the room ambient temperature. Therefore, consideration  
should be given to installing the equipment in an environment  
compatible with the manufacturer’s maximum rated ambient  
temperature (Tmra). E35  
Caution: Installation of the equipment in a rack should be such  
that the amount of air flow required for safe operation of the  
equipment is not compromised. E36  
Warning: Reliable earthing of rack-mounted equipment should  
be maintained. Particular attention should be given to supply  
connections other than direct connections to the branch circuits  
(e.g., use of power strips). E37  
27  
 
Chapter 2: Installation  
Selecting a Site for the Switch  
Observe the following requirements when choosing a site for your switch:  
ˆ If you plan to install the switch in an equipment rack, ensure that the  
rack is safely secured and that it will not tip over. Devices in a rack  
should be installed starting at the bottom, with the heavier devices  
near the bottom of the rack.  
ˆ If you are installing the switch on a table, ensure that the table is level  
and secure.  
ˆ The power outlet for the switch should be located near the unit and  
should be easily accessible.  
ˆ The site should provide for easy access to the ports on the front of the  
switch. This will make it easier for you to connect and disconnect  
cables, as well as view the switch’s LEDs.  
ˆ To allow proper cooling of the switch, air flow around the unit and  
through its vents on the side and rear should not be restricted.  
ˆ Do not place objects on top of the switch.  
ˆ Do not expose the switch to moisture or water.  
ˆ Ensure that the site is a dust-free environment.  
ˆ You should use dedicated power circuits or power conditioners to  
supply reliable electrical power to the network devices.  
28  
 
 
AT-GS950/16 and AT-GS950/24 Gigabit Ethernet Smart Switches Installation Guide  
Cable Specifications  
Table 5 contains the cable specifications for the twisted pair ports.  
Table 5. Twisted Pair Cabling and Distances  
Maximum  
Speed  
Type of Cable  
Operating  
Distance  
10 Mbps  
Standard TIA/EIA 568-B-compliant 100 m (328 ft)  
Category 3 or better shielded or  
unshielded cabling with 100 ohm  
impedance and a frequency of 16  
MHz.  
100 Mbps  
Standard TIA/EIA 568-A-compliant 100 m (328 ft)  
Category 5 or TIA/EIA 568-B-  
compliant Enhanced Category 5  
(Cat 5e) shielded or unshielded  
cabling with 100 ohm impedance  
and a frequency of 100 MHz.  
1000 Mbps  
Standard TIA/EIA 568-A-compliant 100 m (328 ft)  
Category 5 or TIA/EIA 568-B-  
compliant Enhanced Category 5  
(Cat 5e) shielded or unshielded  
cabling with 100 ohm impedance  
and a frequency of 100 MHz.  
Note  
The twisted pair ports on the switch feature auto-MDI when  
operating at 10, 100 or 1000 Mbps. Each of the ports is individually  
configured as MDI or MDI-X when connected to an end node.  
Consequently, you can use a straight-through twisted pair cable  
when connecting any type of network device to a port on the switch.  
29  
 
   
Chapter 2: Installation  
Unpacking the Switch  
To unpack the switch, perform the following procedure:  
1. Remove all components from the shipping package.  
Note  
Store the packaging material in a safe location. You must use the  
original shipping material if you need to return the unit to Allied  
Telesis.  
2. Place the switch on a level, secure surface.  
3. Verify that the following hardware components are included in your  
switch package. If any item is missing or damaged, contact your Allied  
Telesis sales representative for assistance.  
ˆ One AT-GS950/16 or AT-GS950/24 Smart Switch  
ˆ Two rack-mount brackets  
ˆ Eight rack-mount bracket screws (black)  
ˆ Four rack-mounting screws (stainless steel)  
ˆ Four rubber feet (for desktop use)  
ˆ One management cable  
ˆ One power cord  
ˆ Documentation CD  
30  
 
 
AT-GS950/16 and AT-GS950/24 Gigabit Ethernet Smart Switches Installation Guide  
Installing the Switch on a Desktop  
You can install the AT-GS950/16 and AT-GS950/24 Gigabit Ethernet  
Smart Switches on a desktop or in a standard 19-inch equipment rack. To  
To place the switch on a desktop, perform the following procedure:  
1. Remove all equipment from the package and store the packaging  
material in a safe place.  
2. Turn the switch over and attach the four rubber feet to the bottom of  
the switch as shown in Figure 6.  
1 6 1 5  
L I N K / A  
1 6 1 4 1 2 1 0  
L I N K / A  
8
6
4
2
W E P R O  
T C  
T C  
T C  
S P E E D  
L I N K / A  
S P E E D  
5 1 3 1 1 1  
9
7
1
3
t S w i t c h e b S m a r  
t 1 o 0 r / 1 0 1 0 6 / 1 - P 0 0 0 M b p s + 2 S F P C o  
-
m
G T  
b o  
5 S A W 9 5 0 / 1 6  
1299  
Figure 6. Attaching the Rubber Feet  
3. Turn the switch over again and place it on a flat, secure surface (such  
as a desk or table) leaving ample space around the unit for ventilation.  
31  
 
   
Chapter 2: Installation  
Installing the Switch in an Equipment Rack  
To install the switch in a standard 19-inch equipment rack, perform the  
following procedure:  
1. If attached, remove the rubber feet using a flat-head screwdriver.  
2. Install a bracket on one side of the switch using a Phillips screwdriver  
and four of the rack-mount screws included with the switch. Figure 7  
and Figure 8 illustrate installing the brackets on the AT-GS950/16 and  
AT-GS950/24 Switches, respectively.  
16  
761  
Figure 7. Attaching the Rack-Mount Bracket to the AT-GS950/16 Switch  
23  
24  
743  
Figure 8. Attaching the Rack-Mount Bracket to the AT-GS950/24 Switch  
3. Repeat step 2 to attach the remaining bracket to the other side of the  
switch.  
32  
 
     
AT-GS950/16 and AT-GS950/24 Gigabit Ethernet Smart Switches Installation Guide  
4. Mount the switch in a standard 19-inch equipment rack using the four  
large screws included. Figure 9 and Figure 10 show how to mount the  
AT-GS950/16 Switch and AT-GS950/24 Switch, respectively.  
16  
762  
Figure 9. Mounting the AT-GS950/16 Switch in an Equipment Rack  
23  
24  
760  
Figure 10. Mounting the AT-GS950/24 Switch in an Equipment Rack  
33  
 
   
Chapter 2: Installation  
Installing an Optional SFP Transceiver  
The AT-GS950/16 and AT-GS950/24 Gigabit Ethernet Smart Switches  
have two slots for optional SFP transceivers. To install an SFP  
transceiver, perform the following procedure:  
Note  
The transceiver can be hot-swapped; you do not need to power off  
the switch to install a transceiver. However, always remove the  
cables before removing the transceiver.  
Note  
You should always install the transceiver before connecting the fiber  
optic cables to it.  
1. Remove the transceiver from its shipping container and store the  
packaging material in a safe location.  
Warning  
An SFP transceiver can be damaged by static electricity. Be sure to  
observe all standard electrostatic discharge (ESD) precautions,  
such as wearing an antistatic wrist strap, to avoid damaging the  
transceiver.  
2. Remove the dust plug from the SFP slot, as shown in Figure 11.  
737  
Figure 11. Removing the Dust Plug from the SFP Slot  
3. Position the SFP transceiver with the label facing up.  
34  
 
   
AT-GS950/16 and AT-GS950/24 Gigabit Ethernet Smart Switches Installation Guide  
4. Slide the transceiver into the SFP slot until it clicks into place.  
738  
Figure 12. Inserting the SFP  
5. Verify that the handle on the transceiver is in the upright position, as  
shown in Figure 13. This secures the transceiver and prevents it from  
being dislodged from the slot.  
SFP Transceiver  
Handle  
1300  
Figure 13. Positioning the SFP Handle in the Upright Position  
6. Repeat steps 2 through 5 to install another SFP transceiver.  
Note  
SFP transceivers are dust sensitive. When a fiber optic cable is not  
installed, or when you store the SFP, always keep the plug in the  
optical bores. When you do remove the plug, keep it for future use.  
35  
 
   
Chapter 2: Installation  
Note  
Unnecessary removal and insertion of an SFP can lead to  
premature failure.  
For information on the cable specifications of the SFP, consult the  
documentation shipped with the SFP.  
36  
 
AT-GS950/16 and AT-GS950/24 Gigabit Ethernet Smart Switches Installation Guide  
Cabling the Switch  
Observe the following guidelines when connecting twisted pair and fiber  
optic cables to the ports on the switch:  
ˆ The connector on the cable should fit snugly into the port on the  
switch. The tab on the connector should lock the connector into place.  
ˆ Because the twisted pair ports have auto-MDI/MDI-X, you can use  
straight-through twisted pair cable to connect any type of network  
device to the switch.  
ˆ If your network topology contains a loop where two or more network  
devices can communicate with each other over more than one network  
path, do not connect the network cables forming the loop until after you  
have activated the Rapid Spanning Tree Protocol on the switch. Data  
loops can adversely affect network performance.  
ˆ If you are creating a port trunk, configure the switch’s management  
software before connecting the cables of the trunk to the switch.  
Otherwise, a network loop will result which can adversely affect  
network performance.  
ˆ In order for a switch port to successfully Auto-Negotiate its duplex  
mode with an end node, the end node should also be using Auto-  
Negotiation. Otherwise, a duplex mode mismatch can occur. A switch  
port using Auto-Negotiation defaults to half-duplex if it detects that the  
end node is not using Auto-Negotiation. This can result in a mismatch  
if the end node is operating at a fixed duplex mode of full-duplex.  
To avoid this problem, disable Auto-Negotiation on a switch port and  
set the port’s speed and duplex mode manually if the end node has a  
fixed duplex mode of full-duplex.  
37  
 
 
Chapter 2: Installation  
Powering On the Switch  
To power on the switch, perform the following procedure:  
1. Plug the power cord into the AC power connector on the back of the  
switch, as shown in Figure 14.  
741  
Figure 14. Plugging in the AC Power Cord  
2. Plug the other end of the power cord into a wall outlet.  
Warning: Power cord is used as a disconnection device. To de-  
energize equipment, disconnect the power cord. E3  
Pluggable Equipment. The socket outlet shall be installed near  
the equipment and shall be easily accessible. E5  
3. Verify that the POWER LED is green. If the LED is OFF, refer to  
The switch is now powered on and ready for network operations. For  
information on how to manage the switch, refer to the AT-S79  
Management Software User’s Guide.  
38  
 
   
Chapter 3  
Troubleshooting  
This chapter contains information on how to troubleshoot the switch if a  
problem occurs.  
Note  
For further assistance, please contact Allied Telesis Technical  
Check the POWER LED on the front of the switch. If the LED is off,  
indicating that the unit is not receiving power, do the following:  
ˆ Verify that the power cord is securely connected to the power source  
and to the AC connector on the back panel of the switch.  
ˆ Verify that the power outlet has power by connecting another device  
to it.  
ˆ Try connecting the unit to another power source.  
ˆ Try using a different power cord.  
ˆ Verify that the voltage from the power source is within the required  
levels for your region.  
Verify that the LINK/ACT LED for each port is ON. If a LINK/ACT LED is  
OFF, do the following:  
ˆ Verify that the end node connected to the port is powered on and is  
operating properly.  
ˆ Verify that the twisted pair cable is securely connected to the port on  
the switch and to the port on the end node.  
ˆ Verify that the twisted pair cable does not exceed 100 meters (328  
feet).  
ˆ Verify that you are using the appropriate category of twisted pair cable:  
Category 3 or better for 10 Mbps operation and Category 5 and  
Category 5E for 100 and 1000 Mbps operation.  
Note  
A 1000Base connection may require five to ten seconds to establish  
a link.  
39  
 
     
Chapter 3: Troubleshooting  
40  
 
Appendix A  
Technical Specifications  
Physical Specifications  
Dimensions:  
AT-GS950/16  
AT-GS950/24  
330 mm x 230.7 mm x 43.2 mm  
(12.99 in x 9.08 in x 1.7 in)  
440 mm x 257 mm x 43.2 mm  
(17.32 in x 10.12 in x 1.7 in)  
Weight:  
AT-GS950/16  
AT-GS950/24  
2.38 kg (5.25 lbs)  
3.25 kg (7.15 lbs)  
Environmental Specifications  
Operating Temperature:  
0° C to 40° C (32° F to 104° F)  
Storage Temperature:  
Operating Humidity:  
Storage Humidity:  
-25° C to 70° C (-13° F to 158° F)  
5% to 90% non-condensing  
5% to 95% non-condensing  
Up to 3,000 m (9,843 ft)  
Operating Altitude Range:  
Power Specifications  
Input Supply Voltage:  
Power Consumption:  
100 - 240 VAC, 50 - 60 Hz  
AT-GS950/16 33 W  
AT-GS950/24 37.2 W  
41  
 
           
Appendix A: Technical Specifications  
Safety and Electromagnetic Emissions Certifications  
EMI/RFI:  
FCC Class A, EN55022 Class A,  
CISPR Class A  
Immunity:  
EN55024  
Electrical Safety:  
EN60950 (TUV), UL60950 (cULus)  
,
C-TICK, CE  
Connectors and Port Pinouts  
This section lists the connectors and connector pinouts for the  
AT-GS950/16 and AT-GS950/24 switches and their components.  
Figure 15 illustrates the pin layout for an RJ-45 connector and port.  
8
8
1
1
Figure 15. RJ-45 Connector and Port Pin Layout  
Table 6 lists the RJ-45 pin signals when a twisted pair port is operating in  
the MDI configuration.  
Table 6. MDI Pin Signals (10Base-T or 100Base-TX)  
Pin  
Signal  
TX+  
1
2
3
6
TX-  
RX+  
RX-  
42  
 
         
AT-GS950/16 and AT-GS950/24 Gigabit Ethernet Smart Switches Installation Guide  
Table 7 lists the RJ-45 port pin signals when a twisted pair port is  
operating in the MDI-X configuration.  
Table 7. MDI-X Pin Signals (10Base-T or 100Base-TX)  
Pin  
Signal  
RX+  
1
2
3
6
RX-  
TX+  
TX-  
Table 8 lists the RJ-45 connector pins and their signals when a  
1000Base-T port is operating at 1000 Mbps.  
Table 8. RJ-45 1000Base-T Connector Pinouts  
Pin  
Pair  
Signal  
1
2
3
4
5
6
7
8
1
1
2
3
3
2
4
4
TX and RX+  
TX and RX-  
TX and RX+  
TX and RX+  
TX and RX-  
TX and RX-  
TX and RX+  
TX and RX-  
43  
 
   
Appendix A: Technical Specifications  
44  
 

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