Allied Telesis AT-GS920/16 Installation And User Manual Download

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Chapter 4: Switch Configuration

Disabling Loop Prevention

Perform the following procedure to disable the Loop Prevention feature:

1. Set DIP switch # 3 to the DOWN position. See Figure 48.

Figure 48. DIP Switch Settings for Disabling Loop Prevention

2. Turn the power OFF by unplugging the AC power cord and then back

ON again by reconnecting it to the AC outlet on the switch. The new
configuration is now implemented and effective and the Loop
Prevention feature is disabled.

Note

A recently changed DIP switch setting becomes effective ONLY
after you turn the switch’s AC power OFF and then back ON.

The Loop Prevention LED should be OFF indicating that the feature is
disabled.

Summary of Contents for AT-GS920/16

Page 1: ...613 002385 Rev B GS920 Series GIGABIT ETHERNET UNMANAGED SWITCHES AT GS920 24 AT GS920 16 AT GS920 8 AT GS920 8PS Installation and User s Guide ...

Page 2: ...arks or registered trademarks of their respective owners Allied Telesis Inc reserves the right to make changes in specifications and other information contained in this document without prior written notice The information provided herein is subject to change without notice In no event shall Allied Telesis Inc be liable for any incidental special indirect or consequential damages whatsoever includ...

Page 3: ...rmful interference in which case the user will be required to correct the interference at his own expense Radiated Energy for the AT GS920 16 and AT GS920 8 Note This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to Part 15 of FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residential inst...

Page 4: ...anada This Class B digital apparatus complies with Canadian ICES 003 Cet appareil numérique de la classe B est conforme à la norme NMB 003 du Canada Translated Safety Statements Important The indicates that translations of the safety statement are available in the PDF document Translated Safety Statements posted on the Allied Telesis website at alliedtelesis com support ...

Page 5: ...ticast Frame Pass Through 28 Energy Efficiency Ethernet EEE 28 Loop Prevention 28 Flooding 29 Backpressure and Flow Control 29 Chapter 2 Hardware Installation 31 Reviewing Safety Precautions 32 Selecting a Site for the Switch 36 Planning the Installation 37 Unpacking the Switch 38 AT GS920 24 Shipping Contents 38 Unpacking the AT GS920 24 Bracket Kit 39 AT GS920 16 Shipping Contents 40 AT GS920 8 ...

Page 6: ...and Duplex Settings 85 Configuring an Individual Port with Speed and Duplex 87 Configuring All Ports with Auto or Force MDI MDI X 88 Configuring an Individual Port with Auto or Force MDI MDI X 89 Reseting Ports to Default Settings 90 Chapter 5 Troubleshooting 93 Appendix A Technical Specifications 95 Physical Specifications 95 Environmental Specifications 95 Safety 96 Electromagnetic Emissions Cer...

Page 7: ...s of Selecting a Root Switch 112 Detecting and Blocking a Loop 113 Loop Detection 113 Blocked Port Selection Criteria 113 Port Blocked Within a LAN 114 Port Blocked on One Switch 115 Blocking a Port Affected by an External Loop 116 Hop Count Limitation 117 ...

Page 8: ...Contents 8 ...

Page 9: ... Used in this Document on page 10 Contacting Allied Telesis on page 11 This manual is the installation and user s guide for the GS920 Series Gigabit Ethernet Unmanaged Switches The switch models included in this manual are AT GS920 24 AT GS920 16 AT GS920 8 AT GS920 8PS ...

Page 10: ... action may result in equipment damage or loss of data Attention Les mises en garde vous informent que l exécution ou l omission d une action spécifique peut endommager l équipement ou entraîner une perte de données Warning Warnings inform you that performing or omitting a specific action may result in bodily injury Advertissement Les avertissements vous informent que l exécution ou l omission d u...

Page 11: ...chandise Authorization RMA and contact Allied Telesis technical experts USA and EMEA phone support Select the phone number that best fits your location and customer type Hardware warranty information Learn about Allied Telesis warranties and register your product online Replacement Services Submit an RMA request via our interactive support center Documentation View the most recent installation gui...

Page 12: ...GS920 Series Gigabit Ehternet Switch Installation and User s Guide 12 ...

Page 13: ...Product Description This chapter contains the follows sections Key Features on page 14 GS920 Series Overview on page 16 Configuration Switches and LED Descriptions on page 22 AT GS920 Feature Descriptions on page 27 ...

Page 14: ...rame Pass Through which can be enabled or disabled by setting a DIP switch Supports AUTO MDI MDI X on all ports All ports are capable of being configured for Fixed MDI X except the last port which is configured for Fixed MDI This feature is enabled and disabled by setting DIP switches and using a front panel push button Supports IEEE 802 3x flow control in full duplex operation and backpressure fl...

Page 15: ... degree C operating temperature Wall Rack mount kit is provided within the AT GS920 24 ship kit Support both wall mount and rack mount functions for RoW Support Power Over Ethernet PoE on AT GS920 8PS Support the port isolation VLAN feature on AT GS920 8PS ...

Page 16: ...Mode and Flow Control These features are each configurable by dedicated front panel DIP switches See AT GS920 Feature Descriptions on page 27 and Feature Configuration on page 73 for more information In addition the switch ports can be individually or collectively configured for auto negotiation or manual duplex and speed settings The highest number port s default setting is MDI MDI X and can be f...

Page 17: ... AT GS920 16 switch has 16 each 10 100 1000Base TX twisted pair ports on the front panel as shown in Figure 3 x Figure 3 AT GS920 16 Front Panel The AT GS920 16 switch has an internal power supply with a single AC power supply socket on the rear panel as shown in Figure 4 x Figure 4 AT GS920 16 Rear Panel AT GS920 8 Switch The AT GS920 8 switch can be installed on a desktop mounted on a wall or mo...

Page 18: ...ch on a wall or in an equipment rack you need the optional wall rack mount kits See Table 1 on page 19 for more information Warning Warning To reduce the risk of electric shock the PoE ports on this product must not connect to cabling that is routed outside the building where this device is located E40 Attention Pour réduire les risques d électrocution les ports PoE de ce produit ne doivent pas êt...

Page 19: ...l Rack Mount Kit provided in the shipping box for all installations except in Japan For Japan installations use the optional AT BRKT J22 Wall Mount Kit instead Use the Wall Rack Mount Kit provided in the shipping box for all installations AT GS920 16 Use the optional AT BRKT J23 wall mount kit Use the optional AT RKMT J05 optional 19 rack mount kit AT GS920 8 Use the optional AT BRKT J23 wall moun...

Page 20: ...ely each port can be manually configured to 10 Mbps 100 Mbps and 1000 Mbps via the switches and push buttons See MDI MDI X for the corresponding description of the MDI X configuration Duplex Mode Each twisted pair port on the switch can operate in either half or full duplex mode at 10 100 Mbps and full duplex mode only when operating at 1000 Mbps The duplex default settings of the twisted pair por...

Page 21: ...guration for all other ports is fixed MDI X When a port is manually configured for a speed of 10M or 100M then that port is also configured for fixed MDI X except in the case of the highest numbered port which is set to fixed MDI Cabling Table 2 contains the cabling specifications for the twisted pair ports Power Connector The AT GS920 switches have a single AC power supply socket on the back pane...

Page 22: ...or their locations Figure 9 AT GS920 8 Front Panel Configuration DIP Switches and LEDs Note The front panel Configuration switches and LED locations are shown for the AT GS920 8 switch Similar switch and LED layouts can also be found on the AT GS920 24 and AT GS920 16 front panels The AT GS920 8PS LEDs and configuration switches are shown in Figure 10 for their locations The AT GS920 8PS switch ha...

Page 23: ...een detected and blocked on one of the Ethernet ports See Table 4 Loop Prevention LED PoE LED AT GS920 8PS Only The PoE LED indicates the status of the PoE function on the switch See Table 4 Table 3 Power LED LED State Description PWR Green ON Power ON OFF Power OFF Table 4 Loop Prevention LED LED State Description LOOP Prevention Green ON Enable Loop Prevention Green Blinking Loop condition detec...

Page 24: ...isabled In the Config mode Type 1 is not selected VLAN TyPE2 Green ON In the Operation mode Type 2is enabled In the Config mode Type 2is selected OFF In the Operation mode Type 2 is disabled In the Config mode Type 2is not selected VLAN TyPE3 Green ON In the Operation mode Type 3is enabled In the Config mode Type 3is selected OFF In the Operation mode Type 3 is disabled In the Config mode Type 3 i...

Page 25: ...eed is configured individually or altogether for 100M or 10M the respective ports are always configured as follows AT GS920 8 Ports 1 7 MDI X Port 8 MDI AT GS920 16 Ports 1 15 MDI X Port 16 MDI AT GS920 24 Ports 1 23 MDI X Port 24 MDI Table 7 Port Mode LEDs LED State Description Table 8 Port Status LEDs for Normal and Configuration Modes Mode Port LED Position LED State Description Normal Mode Upp...

Page 26: ...he Lower LEDs are blinking together in the Configuration Mode then all of the Ethernet ports are eligible to be configured at once When only one of the Lower LEDs is blinking then that port is eligible to be individually configured Table 8 Port Status LEDs for Normal and Configuration Modes Mode Port LED Position LED State Description Table 9 PoE LED LED State Description PoE Green ON The switch i...

Page 27: ...in half or full duplex mode for 10 100 Mbps They are IEEE 802 3u compliant and use Auto Negotiation to set the duplex mode setting for you automatically Note In order for a switch port to successfully Auto Negotiate its duplex mode with a 10 or 100 Mbps end node the end node should also be configured for Auto Negotiation Otherwise a duplex mode mismatch can occur A switch port using Auto Negotiati...

Page 28: ...es switch is operating 10Mbps EEE is not supported This feature can be enabled or disabled by setting DIP switch 2 EEE See Energy Efficiency Ethernet EEE on page 76 for the procedure to enable and disable this feature Loop Prevention The GS920 Series switches support Loop Prevention When a physical network has more than one path between two endpoints a network loop occurs This results is a broadca...

Page 29: ... Ethernet switch may periodically need to signal an end node to stop 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 ope...

Page 30: ...e 30 for Backpressure and Flow control support vs port speed This feature can be enabled or disabled by setting DIP switch 5 FLOW CTRL See Flow Control on page 82 for the procedure to enable and disable this feature Note The GS920 series switches DO NOT SUPPORT the combination of Flooding Flow Control If both the flooding and flow control features are enabled at once traffic will be stopped by pau...

Page 31: ...ecting a Site for the Switch on page 36 Planning the Installation on page 37 Unpacking the Switch on page 38 Installing the Switch on a Table or Desktop on page 43 Installing the Switch on a Wall on page 44 Installing the Switch in an Equipment Rack on page 50 Cabling the Switch on page 57 Powering On the Switch on page 58 ...

Page 32: ...electric shock disconnect electric power to the product before connecting or disconnecting the cables E1 Advertissement Pour éviter tout risque d électroc ution ne pas enlever le capot L appareil ne contient aucun composant réparable par l utilisateur Il est exposé à des tensions dangereuses et ne doit être ouvert que par un technicien compétent et qualifié Pour éviter tout risque d électrocution ...

Page 33: ...ses à des tensions dangereuses E4 Caution Air vents must not be blocked and must have free access to the room ambient air for cooling E6 Attention Les orifices de ventilation doivent rester libres de toute obstruction pour pouvoir assurer le refroidissement par l air de la pièce E6 Note All Countries Install product in accordance with local and National Electrical Codes E8 Note Operating Temperatu...

Page 34: ...ay lead to damaging itself or causing injuries E98 Advertissement N installez pas l appareil haut sur un mur L appareil peut tomber et l appareil tomber peut s endommager ou causer des blessures E98 Warning Disconnecting the Device If the device becomes damaged or you encounter abnormality with the device disconnect the power plug from the AC wall outlet immediately E100 Advertissement Déconnexion...

Page 35: ...ment Utilisez des vis appropriées pour fixer le périphérique et les supports à un rack 19 pouces Si un périphérique est installé de manière non sécurisée dans un rack il risque de tomber et de causer des blessures ou des dommages à l appareil E104 ...

Page 36: ...arting at the bottom with the heavier devices near the bottom of the rack The power outlet for the switch should be located near the unit and should be easily accessible The site should provide for easy access to the ports and the LEDs on the front of the switch should be easily viewed To allow proper cooling off the switch air flow around the unit and through its vents on the side should not be r...

Page 37: ...ently you can use a straight through twisted pair cable when connecting any network device to a twisted pair port on the switch A port operating at 10 or 100 Mbps uses four of the eight strands in twisted pair wiring Table 11 Twisted Pair Cabling and Distances Speed Type of Cable Maximum Operating Distance 10 Mbps Category 3 or better unshielded twisted pair cable 100 m 328 ft 100 Mbps Category 5 ...

Page 38: ...elesis recommends that you use the original shipping material to return the unit to Allied Telesis if required 2 Place the switch on a level secure surface 3 Verify that the hardware components are included in your switch package AT GS920 24 Shipping Contents The contents of the AT GS920 24 shipping box as shown in Table 12 Table 12 AT GS920 24 Shipping Box Contents Description Illustration AT GS9...

Page 39: ...ided in the shipping box with the switch Note If you plan to install the AT GS920 24 on a wall in Japan you must order an AT BRKT J22 optional wall mount kit separately from the switch If you are installing the AT GS920 24 in an equipment rack in Japan use the AT GS920 24 Bracket Kit provide with the unit Table 13 Components in the AT GS920 24 Bracket Kit Bracket Description AT GS920 24 Bracket fo...

Page 40: ...t separately from the switch Note If you plan to install the AT GS920 16 in an equipment rack you must order an AT RKMT J05 optional 19 rack mount kit separately from the switch Two M4x6mm screws for attaching the right side bracket and extension Table 13 Components in the AT GS920 24 Bracket Kit Continued Bracket Description AT GS920 24 Table 14 AT GS920 16 Shipping Box Contents Description Illus...

Page 41: ...tional wall mount kit separately from the switch Note If you plan to install the AT GS920 8 in an equipment rack you must order an AT RKMT J08 optional 19 rack mount kit separately from If any item is missing or damaged contact your Allied Telesis sales representative for assistance Table 15 AT GS920 8 Shipping Box Contents Description Illustration AT GS920 8 Switch AC Power cord Rubber feet Four ...

Page 42: ...al wall mount kit separately Note To install the AT GS920 8PS in an equipment rack you must purchase an AT RKMT J14 or AT RKMT J15 optional 19 rack mount kit separately For more information see Table 1 on page 19 Note If any item is missing or damaged contact your Allied Telesis sales representative for assistance Table 16 AT GS920 8PS Shipping Box Contents Description Illustration AT GS920 8PS Sw...

Page 43: ...curs and you need to return the unit use as much of the original shipping material as possible 3 Install the four rubber feet with the four screws provided on the bottom of the switch chassis See Figure 11 Figure 11 Installation of Rubber Feet 4 Place the switch on a flat and secure surface with the rubber feet firmly on the table or desktop leaving a minimum of 4 around the switch for ventilation...

Page 44: ...rchase the AT BRKT J22 Wall Mount Kit separately To install the AT GS920 16 or AT GS920 8 switch you must purchase the AT BRKT J23 wall mount brackets separately Any of the AT GS920 switch models can be mounted on the wall with the front panel facing left right up or down Before you begin to install the switch review Reviewing Safety Precautions on page 32 Items Need for Wall Installation You need...

Page 45: ... previously installed turn the switch over with the top side down and remove the rubber feet on the bottom of the switch using a Phillips head screwdriver Figure 12 Removing Feet From the Chassis Bottom 3 Turn the switch over with the top side up 4 Orient the brackets against the sides of the switch and secure them to the switch with the four screws provided as shown in Figure 13 Figure 13 Attachi...

Page 46: ...ront panel facing left right up or down 6 Pre drill the marked locations on the wall 7 Install the four plastic anchors into the wall in the holes drilled in previous step 8 Position the switch on the wall and drive screws through the holes to attach the brackets on the wall See Figure 15 x Figure 15 Driving the Screws through the Holes 9 Make sure that the two brackets are installed securely 10 P...

Page 47: ... To unpack the AT BRKT J23 wall mount kit 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 Verify that one pair of brackets is included in your wall mount package listed in Table 13 3 If any item is missing or damaged c...

Page 48: ...em as shown in Figure 16 Figure 16 Removing the Rubber Feet 2 Orient the brackets against the sides of the switch 3 Have another person hold the switch with the brackets at the wall location where the switch is to be installed while you use a pencil to mark the wall with the locations of the four holes in the brackets See Figure 17 as an example AT BRKT J23 Figure 17 Marking the Screw Hole Locatio...

Page 49: ...tep 4 6 Position brackets on the wall and drive screws through the holes to attach the brackets on the wall See Figure 18 Figure 18 Driving the Screws through the Holes 7 Make sure that the two brackets are installed securely 8 Slide the switch into the brackets on the wall as shown in Figure 19 Figure 19 Placing the Switch into the Brackets 9 Proceed to Cabling the Switch on page 57 ...

Page 50: ...ack mount brackets separately The AT RKMT J05 Rack Mount Kit is for the AT GS920 16 switch and the AT RKMT J08 Rack Mount Kit is for the AT GS920 8 Before you begin to install the switch review Reviewing Safety Precautions on page 32 What to Prepare for Installation in a Rack You need the following items to install the switch in an equipment rack A switch One pair of brackets For more information ...

Page 51: ...rubber feet from the bottom of the switch using a Phillips head screwdriver Figure 21 Removing Rubber Feet 4 Turn the switch over 5 Attached the brackets to the switch with the M3x6mm screws using a Phillips head screwdriver See Figure 22 x Figure 22 Attaching the Brackets to the Switch 6 Mount the switch in a standard 19 inch equipment rack with four equipment rack screws as shown in Figure 23 ...

Page 52: ...J08 rack mount kit respectively perform the following procedures Note You must purchase theAT RKMT J05 or AT RKMT J08 rack mount kit separately Unpacking the AT RKMT J05 or AT RKMT J08 Rack Mount Kit To unpack the AT RKMT J05 or AT RKMT J08 rack mount kit perform the following procedure 1 Remove all components from the shipping package Note Store the packaging material in a safe location You must ...

Page 53: ...maged contact your Allied Telesis sales representative for assistance Table 18 Components in Rack Mount Kit Rack Mount Kit AT RKMT J05 AT RKMT J08 Two Short Brackets Two Handles Two Cable Brackets Two Long Brackets Eight M3x6mm screws Eight M4x6mm screws Ten Tie wrap ...

Page 54: ... 1 Place all the items from the packaging on a work table 2 Remove the rubber feet if previously installed 3 Attach the handle to the short bracket with M3x6mm screws using a Phillip head screw driver as shown in Figure 24 Figure 24 Attaching Handles to Brackets 4 Attach the short bracket and handle to the long bracket with M4x6mm screws using a Phillip head screw driver as shown in Figure 25 Figu...

Page 55: ...the units in Step 5 to the switch with M3x6mm screws using a Phillip head screw driver as shown in Figure 27 Figure 27 Attaching the Plates to the Switch 8 Mount the switch in a standard 19 inch equipment rack with four equipment rack screws as shown in Figure 28 on page 56 Note The screws are not included in the AT RKMT J05 rack mount kit ...

Page 56: ...ries Gigabit Ehternet Switch Installation and User s Guide 56 Figure 28 Attaching the Switch to Equipment Rack 9 Attach the power cord to the back panel of the switch 10 Proceed to Cabling the Switch on page 57 ...

Page 57: ...into the port on the switch The tab on the connector should lock the connector into place The ports on the switch are configure for auto MDI MDI X out of the shipping box You can use a straight through twisted pair cable to connect any type of network device to a port on the switch The network should not contain data loops which can adversely affect network performance A data loop exists when two ...

Page 58: ...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 Advertissement Le cordon d alimentation est utilisé en tant que mécanisme de déconnexion Pour mettre l équipement hors tension débrancher le cordon d alimentation E3 Note Pluggable Equipment The socket outlet shall be installed near the equipment...

Page 59: ...roubleshooting on page 93 The switch is now powered on and ready for network operations Warning Disconnecting the Device If the device becomes damaged or you encounter abnormality with the device disconnect the power plug from the AC wall outlet immediately E100 Advertissement Déconnexion de l appareil si l appareil est endommagé ou si vous constatez une anomalie débranchez immédiatement le cordon...

Page 60: ...gabit Ehternet Switch Installation and User s Guide 60 5 If the switch is installed in a rack use the tie warps provided to secure the power cord as shown in Figure 30 Figure 30 Securing the Power Cord Using Tie wraps ...

Page 61: ... GS920 8PS Switch The procedures in this chapter are Installing the AT GS920 8PS Switch on a Table on page 62 Installing theAT GS920 8PS Switch in an Equipment Rack on page 63 Installing the AT GS920 8PS Switch on a Wall on page 68 ...

Page 62: ... une table ou un bureau car cela pourrait présenter un risque pour la sécurité personnelle si vous devez déplacer ou remplacer les commutateurs E76 Warning Suitable for installation in Information Technology Rooms in accordance with Article 645 of the National Electrical Code and NFPA 75 Advertissement Peut être installé dans des salles de matériel de traitement de l information conformément à l a...

Page 63: ...ons for the AT GS920 8PS Switch Installing Two Switches in One Row To install two switches in one row of the equipment rack you need the following items AT RKMT J15 rack mount kit Cross head screwdriver To install two switches in one row of the equipment rack perform the following procedures 1 Review Selecting a Site for the Switch on page 36 to verify the suitability of the site for the switch 2 ...

Page 64: ... counterclockwise and pull out the tray You can draw the tray to a maximum of 250mm from the tray chassis Figure 33 Puling out the AT RKMT J15 Tray 4 Place a switch in the tray and secure the switch to the tray with the head screws through the holes on the slide rail weld Note You can install two AT GS920 8PS switches Install one switch at a time ...

Page 65: ... the tray back to its original position and turning the tray fixing screws on clockwise Figure 35 Securing the AT RKMT J15 Tray in a n Equipment Rack Installing a Switch in One Row To install the switch in one row of the equipment rack you need the following items AT RKMT J14 Rack mount bracket kit Flat head screwdriver Cross head screwdriver ...

Page 66: ...recommends that you get assistance when mounting the chassis in an equipment rack E28 Attention Le châssis peut être lourd et difficile à soulever Allied Telesis recommande de demander de l assistance lors de l installation d un châssis dans un rack E28 1 Review Selecting a Site for the Switch on page 36 to verify the suitability of the site for the switch 2 Attach the handles to the brackets as s...

Page 67: ... to the sides of the switch with the eight bracket screws as shown in Figure 37 Figure 37 Installing the Brackets on the Switch 4 While another person holds the switch in the equipment rack secure it with standard equipment rack screws as shown in Figure 38 Figure 38 Mounting the Switch in an Equipment Rack ...

Page 68: ...allation protective earthing conductor For example a power cord is connected to a socket outlet with earthing connection Si la mise à la terre de protection est utilisée comme protection les instructions doivent exiger le raccordement du conducteur de protection de l équipement au conducteur de protection de l installation Par exemple un cordon d alimentation est connecté à une prise de courant av...

Page 69: ... wood screws to attach the unit to a wall not included Cross head screwdriver Pencil Drill Note You must provide screws to attach the brackets to the switch a cross head screwdriver a pencil and a drill Installing the Switch on a Wall To install the AT GS920 8PS switch on a wall perform the following procedure 1 Review Selecting a Site for the Switch on page 36 before performing this procedure 2 A...

Page 70: ...s the switch at the wall location mark the holes with a pencil 4 Pre drill the marked holes 5 While another person holds the switch at the wall location secure the switch to the wall using the eight wall mounting screws See Figure 41 Figure 41 Installing the Switch on the Wall ...

Page 71: ... page 76 Loop Prevention on page 78 Flooding on page 80 Flow Control on page 82 Ethernet Port Configuration Force MDI MDI X and Auto MDI MDI X on page 84 Configuring All Ports with the Same Speed and Duplex Settings on page 85 Configuring an Individual Port with Speed and Duplex on page 87 Configuring All Ports with Auto or Force MDI MDI X on page 88 Configuring an Individual Port with Auto or For...

Page 72: ...and User s Guide 72 Configuration Switch and LED Locations The GS920 Series switch is configured with the DIP switches and push buttons shown in Figure 42 Front Panel Configuration Switches and LEDs Figure 42 Front Panel Configuration Switches and LEDs ...

Page 73: ... Through feature See Figure 42 Front Panel Configuration Switches and LEDs on page 72 for the DIP switch location on the front panel Note The Flooding feature has priority over Multicast Frame Pass Through feature when both are enabled If you prefer to have the Multicast Frame Pass Through feature enabled the Allied Telesis recommends that you disable the Flooding feature See Disabling Flooding on...

Page 74: ...new switch setting is now implemented and effective and the Multicast Frame Pass Through feature is enabled Note A recently changed DIP switch setting becomes effective ONLY after you turn the switch s AC power OFF and then back ON In this configuration other packet types such as EAP BPDU and others are allowed to pass through the switch The following multicast addresses are filtered out and are N...

Page 75: ... and then back ON again by reconnecting it to the AC outlet on the switch The new switch setting is now implemented and effective and the Multicast Frame Pass Through is disabled Note A recently changed DIP switch setting becomes effective ONLY after you turn the switch s AC power OFF and then back ON Note When this feature is disabled the following multicast addresses are filtered out and are NOT...

Page 76: ...P Switch Settings for Enabling EEE 2 Turn the power OFF by unplugging the AC power cord and then back ON again by reconnecting it to the AC outlet on the switch The new switch setting is now implemented and effective and the EEE energy saving behavior is now enabled for all the Ethernet ports Note A recently changed DIP switch setting becomes effective ONLY after you turn the switch s AC power OFF...

Page 77: ... then back ON again by reconnecting it to the AC outlet on the switch The new configuration is now implemented and effective and the EEE feature is disabled Note A recently changed DIP switch setting becomes effective ONLY after you turn the switch s AC power OFF and then back ON Table 19 EEE Support for Port Speed Link Configuration Supported Speed Link Unsupported Speed Link 1000M Auto Negotiati...

Page 78: ...abling Flow Control on page 83 1 Set DIP switch 3 to the UP position to enable Loop Prevention See Figure 47 Figure 47 DIP Switch Settings for Enabling Loop Prevention 2 Turn the power OFF by unplugging the AC power cord and then back ON again by reconnecting it to the AC outlet on the switch The new switch setting is now implemented and effective and the Loop Prevention feature is enabled for all...

Page 79: ...revention 2 Turn the power OFF by unplugging the AC power cord and then back ON again by reconnecting it to the AC outlet on the switch The new configuration is now implemented and effective and the Loop Prevention feature is disabled Note A recently changed DIP switch setting becomes effective ONLY after you turn the switch s AC power OFF and then back ON The Loop Prevention LED should be OFF ind...

Page 80: ...ooding is enabled all packet types including BPDU packets are allowed to pass through the switch with the following exceptions a Any MAC address containing Ether type 0x8808 is filtered on the AT GS920 8 only b 802 3x Pause Frames are filtered Allied Telesis recommends disabling the Multicast Frame Pass Through feature when the Flooding feature is enabled Enabling Flooding Perform the following pr...

Page 81: ...s AC power OFF and then back ON Disabling Flooding Perform the following procedure to disable the Flooding feature 1 Set DIP switch 4 to the DOWN position See Figure 50 Figure 50 DIP Switch Settings for Disabling Flooding 2 Turn the power OFF by unplugging the AC power cord and then back ON again by reconnecting it to the AC outlet on the switch The new configuration is now implemented and effecti...

Page 82: ...ge 79 Enabling Flow Control Perform the following procedure to enable the Flow Control feature 1 Set DIP switch 5 to the UP position to enable this feature See Figure 51 Figure 51 DIP Switch Settings for Enabling Flow Control 2 Turn the power OFF by unplugging the AC power cord and then back ON again by reconnecting it to the AC outlet on the switch The new switch setting is now implemented and ef...

Page 83: ...igure 52 DIP Switch Settings for Disabling Flow Control 2 Turn the power OFF by unplugging the AC power cord and then back ON again by reconnecting it to the AC outlet on the switch The new configuration is now implemented and effective and the Flow Control feature is disabled Note A recently changed DIP switch setting becomes effective ONLY after you turn the switch s AC power OFF and then back O...

Page 84: ... of the ports to the same speed and duplex configuration 1 Set DIP switch 6 OPERATION CONFIG to the UP CONFIG position The switch is now in the port configuration mode 2 Set DIP switch 7 ALL EACH to the DOWN ALL position as shown in Figure 53 All of the port LEDs flash indicating that all of the ports are ready to be configured Table 20 Port Configuration Port Configuration Default Settings Option...

Page 85: ...n setting You can select one from six pre configured settings Auto Negotiation 1000M in full duplex 100M in full duplex 100M in half duplex 10M in full duplex 10M in half duplex Each time you press the MODE button the port configuration advances to the next pre configured setting in the sequence Figure 54 shows the sequence and each MODE LEDs display Figure 54 Port Configuration ...

Page 86: ... not yet implemented 5 Turn the power OFF by unplugging the AC power cord and then back ON again by reconnecting it to the AC outlet on the switch The new port configuration for all of the Ethernet ports is implemented and effective Note This new configuration only takes effect after turning the switch OFF and then back ON Configuring Individual Ports with Speed and Duplex To set individual ports ...

Page 87: ...You can select one from six pre configured settings Auto Negotiation 1000M in full duplex 100M in full duplex 100M in half duplex 10M in full duplex 10M in half duplex Each time you press the MODE button the port configuration advances to the next pre configured setting in the sequence Figure 54 on page 86 shows the sequence and each MODE LEDs display Note The FORCE_MDI MODE push button is a dual ...

Page 88: ... back ON Force MDI MDI X and Auto MDI MDI X The switch ports can be configured to Auto MDI MDI X or Force MDI MDI X You can configure MDI MDI X on ports all together or individually Table 21 explains these options Table 21 MDI MDI X Settings Configuration Method Option Description All ports together Force MDI MDI X All ports except the highest number port are fixed to MDI The highest number port i...

Page 89: ...X When the FORCE MDI LED is on Force MDI MDI X is on when the FORCE MDI LED is off Auto MDI MDI X is on Note The FORCE_MDI MODE push button is a dual purpose button When it is pressed for less than one second it advances the configuration port settings for speed and duplex When it is pressed for more than one second the configuration is toggled between Force MDI MDI X and Auto MDI MDI X 4 After ch...

Page 90: ...flashes indicating that this port is ready to be configured 4 Push the MODE button for more than 1 second to toggle Auto MDI MDI X and Force MDI MDI X When the FORCE MDI LED is on Force MDI MDI X is on when the FORCE MDI LED is off Auto MDI MDI X is on Note The FORCE_MDI MODE push button is a dual purpose button When it is pressed for less than one second it advances the configuration port setting...

Page 91: ...ports are flashing now 3 Push the NEXT PORT button for three seconds or more The configuration of all ports is back to default The four MODE LEDs flash until the button is released 4 Set DIP switch 6 OPERATION CONFIG to the DOWN OPERATION position The switch is now in the port operational mode The default configuration is now temporarily stored in flash memory but is not yet implemented 5 Turn the...

Page 92: ...GS920 Series Gigabit Ehternet Switch Installation and User s Guide 92 ...

Page 93: ...he power outlet or power supply has power by connecting another device to it Try connecting the unit to another power source Try using a different power cord Verify that the voltage from the power source is within the required levels for your region Verify that the L A LED for each port is green If an L A LED is OFF do the following Verify that the end node connected to the port is powered ON and ...

Page 94: ...GS920 Series Gigabit Ehternet Switch Installation and User s Guide 94 ...

Page 95: ...Twisted Pair Port Connectors on page 99 Physical Specifications Dimensions AT GS920 8PS 210 mm x 275 mm x 43 mm AT GS920 8 210 mm x 121 mm x 38 mm AT GS920 16 263 mm x 179 mm x 38 mm AT GS920 24 341 mm x 210 mm x 44 mm Weight AT GS920 8PS 2 5 Kg AT GS920 8 0 8 Kg AT GS920 16 1 4 Kg AT GS920 24 2 1 Kg Environmental Specifications Operating Temperature 0 C to 50 C 32 F to 122 F Storage Temperature 2...

Page 96: ...igabit Ehternet Switch Installation and User s Guide 96 Safety 60950 1 cULus UL cULus CE IEC EN60950 1 UL CB EN60950 1 UL EU The following standard applies only to the AT GS920 8PS model 62368 1 UL cULus UL CB UL EU ...

Page 97: ...lass A AT GS920 8PS Class B AT GS920 8 Class B AT GS920 16 Class A AT GS920 24 JP RCM AS NZS CISPR 32 2013 Class A AT GS920 8PS Class B AT GS920 8 Class B AT GS920 16 Class A AT GS920 24 AU NZ ANATEL Class A AT GS920 24 Brazil Immunity EN55024 EN61000 3 2 EN61000 3 3 Electrical Safety UL 60950 1 cULus UL CB UL EU Warning In a domestic environment this product may cause radio interference in which ...

Page 98: ...4 Surge IEC 61000 4 6 2014 RF Conducted Immunity IEC 61000 4 8 2010 Power Frequency Magnetic Field Immunity IEC 61000 4 11 2004 Short Interruptions and Voltage Variations IEC 61000 3 2 2014 Harmonic Current Emission IEC 61000 3 3 2013 Voltage Fluctuations and Flicker Power Specifications Model Power Ratings Frequency AT GS920 8PS 100 240 VAC 1 70A 50 60 Hz AT GS920 8 100 240 VAC 0 20 A 50 60 Hz AT...

Page 99: ...connector and port Figure 56 RJ 45 Connector and Port Pin Layout Table 22 lists the RJ 45 pin signals when a twisted pair port is operating in the MDI configuration Table 23 lists the RJ 45 port pin signals when a twisted pair port is operating in the MDI X configuration Table 22 MDI Pin Signals 10Base T or 100Base TX Pin Signal 1 TX 2 TX 3 RX 6 RX Table 23 MDI X Pin Signals 10Base T or 100Base TX...

Page 100: ...stallation and User s Guide 100 Table 24 lists the pin signals when a port is operating at 1000 Mbps Table 24 Pin Signals 1000 Mbps Pin Pair Signal Name 1 1 TX _D1 2 1 TX _D1 3 2 RX _D2 4 3 BI _D3 5 3 BI _D5 6 2 RX _D2 7 4 BI _D4 8 4 BI _D4 ...

Page 101: ... AT BRKT J22 Wall Mount Kit on page 102 Installing a Switch Using the AT BRKT J22 Wall Mount Kit on page 103 Note When you are installing the AT GS920 24 switch in a rack in Japan you need to use the AT BRKT J22 wall mount kit which must be purchased separately from the switch Note Before you begin to install the switch using the AT BRKT J22 wall mount kit review Reviewing Safety Precautions on pa...

Page 102: ...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 Verify that One pair of brackets is included in your wall mount package listed in Table 25 3 If any item is missing or damaged contact your Allied Telesis sales representative for assistance Table 25 Components in the AT BRKT J22 Wall Mount Kit Descrip...

Page 103: ...rews to attach the brackets to a wall Eight plastic anchors for the screws Phillips head screwdriver Pencil Note Screws and plastic anchors are not included in the shipping box You must provide screws that hold the switch securely to the wall Installing a Switch Using the AT BRKT J22 Brackets To install the switch on a wall perform the following procedure 1 If the rubber feet were previously insta...

Page 104: ...where the switch is to be installed Use a pencil to mark the wall with the locations of the four holes in the brackets See Figure 58 as an example x Figure 58 Marking the Screw Hole Locations 4 Pre drill the marked locations on the wall at the locations marked in Step 3 5 Install the four plastic anchors into the wall in the holes drilled in Step 4 ...

Page 105: ...screws through the holes to attach the brackets on the wall See Figure 59 x Figure 59 Driving the Screws through the Holes 7 Make sure that the two brackets are installed securely 8 Slide the switch into the brackets on the wall as shown in Figure 60 x Figure 60 Placing the Switch into the Brackets ...

Page 106: ...le Locations 10 Remove the two brackets and switch and set aside 11 Pre drill the marked locations on the wall at the locations marked in Step 9 12 Install the four plastic anchors into the wall in the holes drilled in Step 11 13 Slide the switch into the bottom brackets and place the other two brackets on the top of the switch 14 Install the screws through the bracket holes to attach them to the ...

Page 107: ... Wall Mount Installation 107 x Figure 62 Driving the Screws through the Holes 15 Make sure that the switch is installed securely to the wall Proceed to Cabling the Switch on page 57 and then to Powering On the Switch on page 58 ...

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Page 109: ...k while keeping connectivity of devices Loops in Ethernet networks can cause broadcast storms that consume network bandwidth and reduce network performance When Loop Prevention is enabled the switch sends Loop Prevention frames periodically A loop is detected in the LAN when the switch receives the Loop Prevention frame sent from itself When this occurs the Loop Detection selects one of the LAN sw...

Page 110: ...a port is blocked the switch does not flood packets even when Flooding is enabled A port receives Loop Prevention frames even when the port is blocked The AT GS920 8 switch with Loop Prevention enabled ignores a Loop Prevention frame if its hop count exceeds 32 The AT GS920 16 and AT GS920 24 switch with Loop Prevention enabled ignores a Loop Prevention frame if its hop count exceeds 10 Allied Tel...

Page 111: ...ted to be the root switch If multiple switches have the same highest switch priority the switch with the smallest MAC address becomes the root switch Switch Priority Table 26 shows the switch priorities specified for each GS920 Series model Note The AT GS920 8PS and AT GS920 8 switches have higher priority than the AT GS920 16 and AT GS920 24 switches Root Switch Once a switch is assigned as the r...

Page 112: ...e switch interprets the situation as a topology change where the root switch no longer is present The non root switch changes itself back to a root switch and begins to broadcast Loop Prevention frames which starts a new selection process for a new root switch Examples of Selecting a Root Switch Root Switch Based on Highest Priority In the example shown in Figure 63 Switch A is elected as the root...

Page 113: ...he LAN is to be blocked The blocked port stops receiving and forwarding all data traffic except for the Loop Prevention frames Blocked Port Selection Criteria After a loop is detected in the LAN Loop Prevention selects a specific port for blocking by applying the following rules in order of precedence 1 The port with the largest hop count from the root switch 2 Among the ports with the same hop co...

Page 114: ...t from the root switch Ax Figure 65 Case 1 Selecting a Port to be Blocked When a loop is detected in the example shown in Figure 66 Port 1 on the Switch D is blocked to relieve the loop Port 1 and Port 9 on Switch D have the same hop count but Port 1 is blocked because the switch priority of Switch C where Port 1 is linked is lower than the switch priority of Switch B where Port 9 is linked Ax Fig...

Page 115: ...Case 3 Selecting a Port to be Blocked Port Blocked on One Switch When a loop occurs within one GS920 Series switch all the ports have the same hop count same switch priority and same MAC address Loop Prevention selects a port to block based on the port numbers When a loop occurs within one AT GS920 8 switch Loop Prevention blocks the port with the smaller port number See Figure 68 as an example Fi...

Page 116: ...igure 70 Switch A is the only switch that has Loop Prevention enabled in the LAN and the other switches in the LAN have Loop Prevention disabled Since Switch A is the only switch with Loop Prevention enabled it is by definition the root switch Port 1 of Switch A is blocked as a result Ax Figure 70 Blocking a Port Affected by an External Loop ...

Page 117: ...ntion frame when the hop count in the frame exceeds the maximum hop count of the switch If one AT GS920 16 or AT GS920 24 switch exist in a topology Loop Prevention ignores a Loop Prevention frame when its hop count is over 10 Allied Telesis recommends designing the network with 10 or less cascade levels when building a Loop Prevention enabled network Table 27 Maximum Hop Count Model Maximum Hop C...

Page 118: ...GS920 Series Gigabit Ehternet Switch Installation and User s Guide 118 ...

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