Allied Telesis Switch GS900 5E User Manual

Fanless Gigabit  
Ethernet Switches  
AT-GS900/16  
AT-GS900/24  
Installation Guide  
613-000891 Rev. A  
 
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 complies with Canadian ICES-003.  
Cet appareil numérique de la classe A est conforme à la norme NMB-003 du Canada.  
European Union Restriction of the Use of Certain Hazardous Substances  
(RoHS) in Electrical and Electronic Equipment  
This Allied Telesis RoHS-compliant product conforms to the European Union Restriction of the Use of Certain Hazardous  
Substances (RoHS) in Electrical and Electronic Equipment. Allied Telesis ensures RoHS conformance by requiring  
supplier Declarations of Conformity, monitoring incoming materials, and maintaining manufacturing process controls.  
RFI Emissions  
FCC Class A, CISPR 22 Class A, EN55022 Class A, C-TICK  
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  
EN60950-1 (TUV), UL 60950 (CULUS)  
3
 
Translated Safety Statements  
Important: The indicates that a translation of the safety statements is available in a PDF  
document titled “Translated Safety Statements” (613-000405) which is posted on the Allied Telesis  
shipped with the product.  
4
 
Preface ..................................................................................................................................................................................7  
Chapter 1: Product Description ........................................................................................................................................12  
Chapter 2: Installation .......................................................................................................................................................22  
Chapter 3: Troubleshooting ..............................................................................................................................................37  
Appendix A: Technical Specifications .............................................................................................................................38  
5
 
Contents  
6
 
Preface  
This guide contains instructions on how to install the AT-GS900/16 and  
AT-GS900/24 Gigabit Ethernet Switches. This preface contains the  
following sections:  
7
 
 
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.  
8
 
   
AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet 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.  
9
 
 
Preface  
Contacting Allied Telesis  
This section provides Allied Telesis contact information for technical  
support as well as sales or corporate information.  
Online Support You can request technical support online by accessing the Allied Telesis  
Knowledge Base from the following web site:  
www.alliedtelesis.com/support. 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 Allied Telesis  
web site: www.alliedtelesis.com. Select your country from the list  
displayed on the website. Then select the appropriate menu tab.  
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 a  
RMA number will be returned to the sender at the sender’s expense.  
Products  
To obtain an RMA number, contact the Allied Telesis Technical Support  
group at our web site: www.alliedtelesis.com/support/rma. Select your  
country from the list displayed on the website. Then select the appropriate  
menu tab.  
For Sales or You can contact Allied Telesis for sales or corporate information at our  
web site: www.alliedtelesis.com. Select your country from the list  
displayed on the website. Then select the appropriate menu tab.  
Corporate  
Information  
Warranty The AT-GS900/16 and AT-GS900/24 switches have a lifetime warranty  
(two years for the power supply). Go to www.alliedtelesis.com/warranty  
for the specific terms and conditions of the warranty and for warranty  
registration.  
10  
 
             
AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide  
Management Software Updates  
New releases of management software for our managed products are  
available from either of the following Internet sites:  
ˆ Allied Telesis web site: www.alliedtelesis.com  
ˆ Allied Telesis FTP server: ftp://ftp.alliedtelesis.com  
If you prefer to download new software from the Allied Telesis FTP server  
from your workstation’s command prompt, you will need FTP client  
software and you must log in to the server. Enter “anonymous” for the user  
name and your email address for the password.  
11  
 
 
Chapter 1  
Product Description  
The AT-GS900/16 and AT-GS900/24 switches are unmanaged, Layer 2  
Fanless Gigabit Ethernet switches designed to simplify the task of creating  
or expanding an Ethernet, Fast Ethernet, or Gigabit Ethernet network.  
This chapter contains the follows sections:  
12  
 
   
AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide  
Features  
AT-GS900/16 and AT-GS900/24 Fanless Gigabit Ethernet switches  
features include:  
ˆ 16 or 24 - RJ-45 10/100/1000 Mbps twisted pair ports  
ˆ System and port LEDs  
ˆ Auto MDI/MDI-X  
ˆ Auto-Negotiation  
ˆ 10/100/1000 Mbps full or half-duplex  
ˆ Back pressure and flow control at half-duplex and IEEE 802.3x flow  
control at full-duplex  
ˆ Broadcast storm control  
ˆ Supports 128K byte packet buffer with a packet length of up to 1522  
bytes  
ˆ Supports two-way dynamic address learning for 8K MAC addresses  
ˆ Supports Jumbo frames of up to 10K bytes  
ˆ MAC address aging - 300 seconds  
ˆ Non-blocking full wire speed  
ˆ Four priority queus per port  
ˆ Internal power supply  
ˆ Fanless design  
Standards  
ˆ IEEE 802.3 – 10Base-T  
ˆ IEEE 802.3 – CSMA/CD  
ˆ IEEE 802.3u – 100Base-TX  
ˆ IEEE 802.3ab – 1000Base-TX Gigabit Ethernet  
ˆ IEEE 802.3z – Full Duplex  
ˆ IEEE 802.3u – Auto-Negotiation  
ˆ IEEE 802.3x – Flow Control, Symmetric and Asymmetric  
13  
 
   
Chapter 1: Product Description  
Components  
Figure 1 illustrates the front panels of the AT-GS900/16 and AT-GS900/24  
switches.  
AT-GS900/16  
600  
System / Port LEDS  
16 - 10/100/1000Base Twisted Pair Ports  
AT-GS900/24  
601  
System / Port LEDS  
24 - 10/100/1000Base Twisted Pair Ports  
Figure 1. Front Panels  
Figure 2 illustrates the back panels of the AT-GS900/16 and AT-GS900/24  
switches.  
AT-GS900/16  
100-240VAC  
602  
AC Power Connector  
AT-GS900/24  
100-240VAC  
603  
AC Power Connector  
Figure 2. Back Panels  
14  
 
   
AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide  
Hardware Feature Description  
The following sections describe hardware features of the AT-GS900/16  
and AT-GS900/24 Fanless Gigabit Ethernet switches:  
ˆ System and Port LEDs  
ˆ Twisted Pair Ports  
ˆ AC Power Connector  
Twisted Pair The AT-GS900/16 Fanless Gigabit Ethernet switch features 16 twisted  
pair ports, and the AT-GS900/24 Fanless Gigabit Ethernet switch features  
24 twisted pair ports.  
Ports  
Type of Connector  
The twisted pair ports feature 8-pin RJ-45 connectors. (For the port  
pinouts, refer to RJ-45 Twisted Pair Port Connectors “RJ-45 Twisted Pair  
Speed  
The ports are 10Base-T, 100Base-TX, and 1000Base-T compliant and are  
capable of 10 megabits per second (Mbps), 100 Mbps, and 1000 Mbps  
speeds. The ports are IEEE 802.3u Auto-Negotiation compliant. With  
Auto-Negotiation, the switch automatically matches the highest possible  
common speed between each switch port and each end-node. For  
example, if an end-node is capable of only 10 Mbps, the switch sets the  
port connected to the end-node to 10 Mbps.  
Duplex Mode  
Each twisted pair port on the switch can operate in either half- or full  
duplex mode. The twisted pair ports are IEEE 802.3u-compliant and will  
Auto-Negotiate the duplex mode setting.  
Note  
For the switch to set the duplex mode for each port correctly, the  
end-nodes that you connect to the switch ports should also use  
Auto-Negotiation. Otherwise, a duplex mode mismatch can occur,  
affecting network performance. For further information, refer to  
15  
 
   
Chapter 1: Product Description  
Maximum Distance  
Each twisted pair port has a maximum operating distance of 100 m  
(328 feet).  
Type of Cabling  
For 10 Mbps operation, Category 3 or better 100 ohm shielded or  
unshielded twisted pair cabling is required. For 100 or 1000 Mbps  
operation, Category 5 and Enhanced Category 5 (5E) 100 ohm shielded  
or unshielded twisted pair cabling is required.  
Auto MDI/MDI-X  
All of the twisted pair ports on the switch are auto-MDI and IEEE 802.3ab-  
compatible. When a port's speed and duplex mode are set through Auto-  
Negotiation, the port uses the auto-MDI feature to automatically configure  
itself as MDI or MDI-X when connected to an end-node. Consequently,  
you can use either a straight-through or crossover twisted pair cable when  
connecting any network device to a port.  
LEDs The system and port LEDs on the front panel of the AT-GS900/16 and  
AT-GS900/24 switches display the switch and its port status information.  
See Figure 3. Each port has two LEDs.  
AT-GS900/16  
607  
AT-GS900/24  
608  
Figure 3. Port LEDs  
16  
 
   
AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide  
Table 2 describes the system and port LEDs on the AT-GS900/16 and  
AT-GS900/24 switches.  
Table 2. System and Port LEDs  
LED  
State  
Green  
Description  
POWER  
The switch is powered ON and operating  
normally.  
OFF  
The switch has no power.  
SPD/LINK/  
ACT  
Solid Green A valid 1000 Mbps link is established on  
the port.  
Solid  
Orange  
A valid 10 or 100 Mbps link is  
established on the port.  
Blinking  
Green  
A 1000 Mbps packet transmission and  
reception is in process on the port.  
Blinking  
Orange  
A 10/100 Mbps packet transmission and  
reception is in process on the port.  
OFF  
No link is established on the port.  
FDX/HDX  
Solid Green A full-duplex link is established on the  
port.  
OFF  
A half-duplex link is established on the  
port.  
AC Power Both the AT-GS900/16 and AT-GS900/24 switches have a single AC  
power supply socket on the back panel, which has auto-switch AC inputs.  
Connector  
See Figure 2 on page 14 for an illustration of the back panels. For the input  
To power ON or OFF the switch, you connect or disconnect the power  
cord.  
17  
 
 
Chapter 1: Product Description  
Ethernet Switching Basics  
An Ethernet switch interconnects network devices, such as workstations,  
printers, routers, and other Ethernet switches, so that they can  
communicate with each other by sending and receiving Ethernet frames.  
MAC Address Every hardware device on your network has a unique MAC address. This  
address is assigned to the device by the device’s manufacturer. For  
Table  
example, when you install a Network Interface Card (NIC) in a computer  
so that you can connect it to the network, the NIC already has a MAC  
address assigned to it by its manufacturer.  
Both the AT-GS900/16 and AT-GS900/24 Fanless Gigabit Ethernet  
switches can contain up to 8,000 entries on their MAC address tables. The  
switch uses the table to store the MAC addresses of the network end-  
nodes connected to the ports, along with the port number on which each  
address was learned.  
A switch learns the MAC addresses of the end-nodes by examining the  
source address of each packet received on a port. It adds the address and  
port on which the packet was received from the MAC table (if the address  
has not already been entered in the table). The result is a table that  
contains all the MAC addresses of the devices that are connected to the  
switch’s ports, and the port number where each address was learned.  
When the switch receives a packet, it also examines the destination  
address and, by referring to its MAC address table, determines the port on  
which the destination end-node is connected. It then forwards the packet  
to the appropriate port and to the end-node. This increases network  
bandwidth by limiting each frame to the appropriate port when the  
intended end-node is located, freeing the other switch ports for receiving  
and transmitting data.  
If the switch receives a packet with a destination address that is not in the  
MAC address table, it floods the packet to all the ports on the switch. If the  
ports have been grouped into virtual LANs, the switch floods the packet  
only to those ports which belong to the same VLAN as the port on which  
the packet was received. This prevents packets from being forwarded into  
inappropriate LAN segments, increasing network security. When the  
destination end-node responds, the switch adds its MAC address and port  
number to the table.  
If the switch receives a packet with a destination address that is on the  
same port on which the packet was received, it discards the packet  
without forwarding it on to any port. Since both the source end-node and  
the destination end-node for the packet are located on the same port on  
the switch, there is no reason for the switch to forward the packet.  
18  
 
   
AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide  
Duplex Mode Duplex mode refers to how an end-node receives and transmits data. If an  
end-node can either receive or transmit data, but not both simultaneously,  
the end-node is operating in what is referred to as half-duplex mode. If an  
end-node can both receive and transmit data simultaneously, the end-  
node is said to be operating in full-duplex mode. Naturally, an end-node  
capable of operating in full-duplex can handle data much faster than an  
end-node that can only operate in half-duplex mode.  
The twisted pair ports on the AT-GS900/16 and AT-GS900/24 switches  
can operate in half- or full-duplex mode for 10/100 Mbps and full-duplex for  
1000 Mbps. They are IEEE 802.3u-compliant and use Auto-Negotiation to  
set the duplex mode setting for you automatically.  
Store and An AT-GS900/16 or AT-GS900/24 switch uses store and forward as the  
method for receiving and transmitting frames. When a Ethernet frame is  
Forward  
received on a switch port, the switch does not retransmit the frame from  
the destination port until it has received the entire frame and stored the  
frame in a port buffer. It then examines the frame to determine if it is a  
valid frame. Invalid frames, such as fragments or runts, are discarded by  
the switch. This process insures that only valid frames are transmitted  
from the switch ports and that damaged frames are not propagated on  
your network.  
Backpressure and To maintain the orderly movement of data between the end-nodes, an  
Ethernet switch may periodically need to signal an end-node to stop  
Flow Control  
sending data. This can occur under several circumstances. For example, if  
two end-nodes are operating at different speeds, the switch, while  
transferring data between the end-nodes, might need to instruct the faster  
end-node to stop transmitting data to allow the slower end-node to catch  
up. An example of this would be when a server operating at 100 Mbps is  
sending data to a workstation operating at only 10 Mbps.  
How a switch signals an end-node to stop transmitting data differs  
depending on the duplex mode of the end-node and switch port. A twisted  
pair port operating in half-duplex mode stops an end-node from  
transmitting data by forcing a collision. A collision on an Ethernet network  
occurs when two end-nodes attempt to transmit data using the same data  
link at the same time. A collision causes an end-node to stop sending data,  
wait for a brief period of time, and then retransmit the same data. Once the  
switch is ready to receive data again, the switch stops forcing collisions.  
This is referred to as backpressure.  
A port operating in full-duplex mode uses PAUSE frames, as specified in  
the IEEE 802.3x standard, to stop the transmission of data from an end-  
node. Whenever the switch wants an end-node to stop transmitting data, it  
issues this frame. The frame instructs the end-node to cease transmission  
for a period of time specified within the frame. The switch continues to  
issue PAUSE frames until it is ready again to receive data from the end-  
node. This is referred to as flow control.  
19  
 
     
Chapter 1: Product Description  
Network Topologies  
This section illustrates two network topologies that you can create with the  
AT-GS900/16 and AT-GS900/24 switches: a power workgroup and  
collapsed backbone. Both types of topologies are described below.  
Power The topology shown in Figure 4 is commonly referred to as a power  
workgroup topology. Each workstation or end-node is connected directly  
Workgroup  
Topology  
to a port on the switch. Each end-node has a dedicated data link to the  
switch for best performance and reliability. The devices can operate at  
speeds of 10 Mbps, 100 Mbps, or 1000 Mbps.  
AT-GS900/16 Fanless Gigabit Ethernet Switch  
1280  
Legend  
10 Mbps  
100 Mbps  
1000 Mbps  
Figure 4. Power Workgroup Topology  
20  
 
   
AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide  
Collapsed In the topology illustrated in Figure 5, an AT-GS900/16 switch connects  
Fast Ethernet switches that have Gigabit Ethernet uplinks. This type of  
Backbone  
topology is often referred to as a collapsed backbone topology. The switch  
functions as the focal point of the network and transfers an Ethernet frame  
between the Fast Ethernet switches only when the destination end-node  
for the frame is on a different switch than the end-node that originated the  
frame. This reduces the amount of unnecessary data traffic in each  
workgroup, freeing up bandwidth and improving network performance.  
AT-GS900/16 Fanless Gigabit Ethernet Switch  
1281  
Fast Ethernet  
Switches with  
Gigabit Uplinks  
1
1
1
2
2
2
3
3
3
4
4
5
4
5
5
6
6
6
7
7
7
8
8
8
Legend  
10 Mbps  
100 Mbps  
1000 Mbps  
Figure 5. Collapsed Backbone - Hub Topology  
21  
 
 
AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide  
Reviewing Safety Precautions  
Please review the following safety precautions before you begin to install  
the switch or any of its components. Refer to the “Translated Safety  
Statements” document for translated safety statements in your language.  
The indicates that a translation of the safety statement is available in a  
PDF document titled “Translated Safety Statements” (613-000405) on the  
included with the documentation CD that is shipped with the product.  
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  
23  
 
 
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 easy 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.  
24  
 
 
AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide  
Planning the Installation  
Table 3 contains the cabling specifications for the twisted pair ports.  
Table 3. Twisted Pair Cabling and Distances  
Maximum  
Speed  
Type of Cable  
Operating  
Distance  
10 Mbps  
Category 3 or better 100-ohm  
shielded or unshielded twisted pair  
cable  
100 m (328 ft)  
100 m (328 ft)  
100 m (328 ft)  
100 Mbps  
Category 5 or Category 5E  
(Enhanced) 100-ohm shielded or  
unshielded twisted pair cable  
1000 Mbps  
Category 5 and Category 5E  
(Enhanced) 100-ohm shielded or  
unshielded twisted pair cable  
Note  
The twisted pair ports on the switch feature Auto-MDI when  
operating at either 10, 100, or 1000 Mbps. Each port is individually  
configured as MDI or MDI-X when connected to an end-node.  
Consequently, you can use either a straight-through or crossover  
twisted pair cable when connecting any network device to a twisted  
pair port on the switch. For example, a port operating at 10 or 100  
Mbps uses two pairs of twisted pair wiring while a port operating at  
1000 Mbps uses four pairs of twisted pair wiring.  
25  
 
 
Chapter 2: Installation  
Unpacking the Switch  
To unpack an AT-GS900/16 or an AT-GS900/24 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. Ensure 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-GS900/16 or AT-GS900/24 Fanless Gigabit Ethernet  
switch  
ˆ Two rackmounting brackets  
ˆ Eight flathead Phillips screws  
ˆ Four #10-32 Phillips screws with a nylon washer  
ˆ Four self-adhesive rubber feet  
ˆ AC power cord  
ˆ Documentation CD  
26  
 
 
AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide  
Installing the Switch on a Table or Desktop  
To install the switch on a table or desktop, perform the following  
procedure:  
1. Remove all the items from the packaging and store the packaging  
material in a safe place. In the event a problem occurs and you need to  
return the unit, please use as much of the original shipping material as  
possible.  
2. Attach the four self-adhesive rubber feet to the bottom of the switch, as  
shown in Figure 6.  
606  
Figure 6. Attaching the Rubber Feet  
3. Place the switch on a flat and secure surface, leaving ample space  
around the switch for ventilation.  
4. Connected the twisted pair cables to the twisted pair ports.  
When connecting a twisted pair cable to a port, observe the following  
guidelines:  
ˆ An RJ-45 connector should fit snugly into the port on the switch.  
The tab on the connector should lock the connector into place.  
ˆ Check that you are using the appropriate type of twisted pair  
cabling. Refer to “Twisted Pair Cabling and Distances” on page 25  
for twisted pair cable specifications.  
ˆ Since the twisted pair port, when operating in Auto-Negotiation, is  
Auto MDI/MDI-X, you can use either a straight-through or  
crossover twisted pair cable to connect any type of network device  
to a port on the switch. If you disable Auto-Negotiation on the port,  
the port defaults to MDI-X.  
5. Apply power to the switch by plugging the AC/DC power adapter into  
an AC power outlet, the plug the DC connector to the power receptacle  
of the switch.  
27  
 
   
Chapter 2: Installation  
Warning  
The power cord is used as a disconnection device. To de-energize  
equipment, disconnect the power cord. E3  
6. Verify that the POWER LED is green. If the LED is OFF, refer to  
Note  
The switch perform a self-diagnostic test upon power up. This takes  
about 20 seconds to complete.  
7. Power ON the end-nodes connected to the switch.  
8. Check that all the SPD/LINK/ACT LEDs are green. If any of the LEDs  
The switch is now ready for use.  
28  
 
AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide  
Installing the Switch on a Wall  
To install the switch on a wall, perform the following procedure:  
1. Remove all the items from the packaging and store the packaging  
material in a safe place. In the event a problem occurs and you need to  
return the unit, please use as much of the original shipping material as  
possible.  
2. Attach the two rackmounting brackets (provided) to the sides of the  
switch using the eight flathead Phillips screws (provided), as illustrated  
1302  
Figure 7. Attaching the brackets to the sides of the switch  
29  
 
   
Chapter 2: Installation  
3. Place the switch on the wall. Then mount the switch using the #10-32  
Phillips screws which are shipped with the product. See Figure 8.  
1303  
Figure 8. Attaching the switch to the wall  
4. Connected the twisted pair cables to the twisted pair ports.  
When connecting a twisted pair cable to a port, observe the following  
guidelines:  
ˆ An RJ-45 connector should fit snugly into the port on the switch.  
The tab on the connector should lock the connector into place.  
ˆ Check that you are using the appropriate type of twisted pair  
cabling. Refer to “Twisted Pair Cabling and Distances” on page 25  
for twisted pair cable specifications.  
ˆ Since the twisted pair port, when operating in Auto-Negotiation, is  
Auto MDI/MDI-X, you can use either a straight-through or  
crossover twisted pair cable to connect any type of network device  
to a port on the switch. If you disable Auto-Negotiation on the port,  
the port defaults to MDI-X.  
30  
 
 
AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide  
5. Apply power to the switch by plugging the AC/DC power adapter into  
an AC power outlet, the plug the DC connector to the power receptacle  
of the switch.  
Warning  
The power cord is used as a disconnection device. To de-energize  
equipment, disconnect the power cord. E3  
6. Verify that the POWER LED is green. If the LED is OFF, refer to  
Note  
The switch perform a self-diagnostic test upon power up. This takes  
about 20 seconds to complete.  
7. Power ON the end-nodes connected to the switch.  
8. Check that all the SPD/LINK/ACT LEDs are green. If any of the LEDs  
are OFF, refer to “Troubleshooting” on page 37 for instructions.  
The switch is now ready for use.  
31  
 
Chapter 2: Installation  
Installing the Switch in a Rack  
Perform the following procedure to install the switch in a standard 19-inch  
rack. If you are not installing the switch in a rack, go to the next procedure.  
1. Place the unit upside down on a level, secure surface.  
2. Using a flat-head screwdriver, remove the self-adhesive rubber feet  
from the bottom of the switch, as shown in Figure 9.  
Figure 9. Removing the Feet  
3. Turn the switch over.  
4. Attach the two rackmounting brackets (provided) to the sides of the  
switch using the eight flathead Phillips screws (provided), as illustrated  
in Figure 10.  
605  
Figure 10. Attaching Rackmounting Brackets  
32  
 
 
AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide  
5. Mount the switch in the 19-inch rack using the #10-32 Phillips screws  
which are shipped with the product, as illustrated in Figure 11.  
606  
Figure 11. Rackmounting the Switch  
6. Connected the twisted pair cables to the twisted pair ports.  
When connecting a twisted pair cable to a port, observe the following  
guidelines:  
ˆ An RJ-45 connector should fit snugly into the port on the switch.  
The tab on the connector should lock the connector into place.  
ˆ Check that you are using the appropriate type of twisted pair  
cabling. Refer to “Twisted Pair Cabling and Distances” on page 25  
for twisted pair cable specifications.  
ˆ Since the twisted pair port, when operating in Auto-Negotiation, is  
Auto MDI/MDI-X, you can use either a straight-through or  
crossover twisted pair cable to connect any type of network device  
to a port on the switch. If you disable Auto-Negotiation on the port,  
the port defaults to MDI-X.  
7. Apply power to the switch by plugging the AC/DC power adapter into  
an AC power outlet, the plug the DC connector to the power receptacle  
of the switch.  
Warning  
The power cord is used as a disconnection device. To de-energize  
equipment, disconnect the power cord. E3  
8. Verify that either the POWER LED is green. If the LED is OFF, refer to  
Note  
The switch perform a self-diagnostic test upon power up. This takes  
about 20 seconds to complete.  
33  
 
Chapter 2: Installation  
9. Power ON the end-nodes connected to the switch.  
10. Check that all the SPD/LINK/ACT LEDs are green. If any of the LEDs  
The switch is now ready for use.  
34  
 
AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide  
Cabling the Switch  
To connect to the ports on the AT-GS900/16 and AT-GS900/24 switches,  
perform the following procedure:  
1. Connect the twisted pair data cables to the RJ-45 ports on the switch,  
as illustrated in Figure 12.  
613  
Figure 12. Connecting the Twisted Pair Data Cables  
2. Power on the end-nodes. For more information, refer to “Powering On  
When connecting a twisted pair cable to a port, observe the following  
guidelines:  
ˆ An RJ-45 connector should fit snugly into the port on the switch.  
The tab on the connector should lock the connector into place.  
ˆ The ports on the switch are auto-MDI/MDI-X. You can use either a  
straight-through or crossover twisted pair cable to connect any type  
of network device to a port on the switch.  
ˆ The network should not contain data loops, which can adversely  
affect network performance. A data loop exists when two or more  
network devices can communicate with each other over more than  
one data path.  
35  
 
 
Chapter 2: Installation  
Powering On the Switch  
To apply power to the AT-GS900/16 and AT-GS900/24 switches, perform  
the following procedure:  
1. Apply AC power to the switch by plugging the power cord into the AC  
power connector on the back panel of the unit, as illustrated in  
Figure 13.  
Warning  
Power cord is used as a disconnection device: To de-energize  
equipment, disconnect the power cord. E3  
100-240  
VA  
C
~
612  
Figure 13. Connecting the AC Power Connector to Switch  
2. Plug the other end or the power cord into a wall outlet.  
3. Verify that the POWER LED is green. If the LED is OFF, refer to  
The switch is ready for network operations.  
36  
 
 
Chapter 3  
Troubleshooting  
This chapter contains information on how to troubleshoot the switch in the  
event that a problem occurs.  
Note  
If you are still unable to resolve the problem after following the  
instructions in this chapter, contact ATI Technical Support for  
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 Ensure 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 Connect the unit to another power source.  
ˆ Use a different power cord.  
ˆ Verify that the voltage from the power source is within the required  
levels for your region.  
Verify that the SPD/LINK/ACT LED for each port is ON. If a SPD/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 Ensure 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 can take from five to ten seconds for the link  
to be established.  
37  
 
     
Appendix A  
Technical Specifications  
Physical Specifications  
Dimensions:  
(W x D x H)  
AT-GS900/16  
330 mm x 230.5 mm x 43 mm  
(13.0 in x 9.07 in x 1.7 in)  
AT-GS900/24  
330 mm x 230.5 mm x 43 mm  
(13.0 in x 9.07 in x 1.7 in)  
Weight:  
AT-GS900/16  
AT-GS900/24  
2.38 kg (5.25 lbs)  
2.99 kg (6.60 lbs)  
Environmental Specifications  
Operating Temperature:  
Storage Temperature:  
Operating Humidity:  
0° C to 40° C (32° F to 104° F)  
-25° C to 70° C (-13° F to 158° F)  
5% to 90% non-condensing  
5% to 95% non-condensing  
Up to 10,000 feet (3,048 meters)  
Storage Humidity:  
Operating Altitude Range:  
Power Specifications  
Power Consumption:  
AT-GS900/16  
15.3 watts maximum  
20.1 watts maximum  
AT-GS900/24  
AC Input Electrical Ratings:  
Frequency:  
100 - 240V AC, 1A  
50/60 Hz  
38  
 
           
AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide  
Safety and Electromagnetic Emissions Certifications  
EMI  
FCC Class A, CISPR 22 Class A,  
EN55022 Class A, C-TICK  
Immunity  
EN55024  
Safety  
UL 60950 (CULUS), EN60950-1 (TUV)  
Quality and Reliability:  
AT-GS900/16 MTBF – 280,000 hours  
AT-GS900/24 MTBF – 230,000 hours  
Compliance Standards  
IEEE 802.3 – 10Base-T  
IEEE 802.3u – 100Base-TX  
IEEE 802.3ab – 1000Base-TX Gigabit Ethernet  
IEEE 802.3z – Full Duplex  
IEEE 802.3u – Auto-Negotiation  
IEEE 802.3x – Flow Control, Symmetric and Asymmetric  
RJ-45 Twisted Pair Port Connectors  
This section lists the connectors and connector pinouts for the  
AT-GS900/16 and AT-GS900/24 Fanless Gigabit Ethernet Switches and  
their components.  
Figure 14 illustrates the pin layout to an RJ-45 connector and port.  
8
8
1
1
Figure 14. RJ-45 Connector and Port Pin Layout  
39  
 
         
Appendix A: Technical Specifications  
Table 4 lists the RJ-45 pin signals when a twisted pair port is operating in  
the MDI configuration.  
Table 4. MDI Pin Signals (10Base-T or 100Base-TX)  
Pin  
Signal  
1
2
3
6
TX+  
TX-  
RX+  
RX-  
Table 5 lists the RJ-45 port pin signals when a twisted pair port is  
operating in the MDI-X configuration.  
Table 5. MDI-X Pin Signals (10Base-T or 100Base-TX)  
Pin  
Signal  
1
2
3
6
RX+  
RX-  
TX+  
TX-  
Table 6 lists the RJ-45 connector pins and their signals when a  
1000Base-T port is operating at 1000 Mbps.  
Table 6. RJ-45 1000Base-T Connector Pinoutsa  
Pin  
Pair  
Signal  
TX and RX+  
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-  
a. Bi-directional data on each pair.  
40  
 
   

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