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Allied Telesis AT-GS920/16 Installation And User Manual

Gigabit ethernet unmanaged switches
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GS920 Series
GIGABIT ETHERNET UNMANAGED SWITCHES
AT-GS920/24
AT-GS920/16
AT-GS920/8
AT-GS920/8PS
Installation and User's Guide
613-002385 Rev B

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Summary of Contents for Allied Telesis AT-GS920/16

  • Page 1 GS920 Series GIGABIT ETHERNET UNMANAGED SWITCHES AT-GS920/24 AT-GS920/16 AT-GS920/8 AT-GS920/8PS Installation and User’s Guide 613-002385 Rev B...
  • Page 2 Telesis, Inc. be liable for any incidental, special, indirect, or consequential damages whatsoever, including but not limited to lost profits, arising out of or related to this manual or the information contained herein, even if Allied Telesis, Inc. has been...
  • Page 3 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.
  • Page 4 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: Table Of Contents

    Guidelines for Installing the Switch on a Wall......................44 Items Need for Wall Installation..........................44 Wall Installation of AT-GS920/24 ...........................45 Wall Installation of AT-GS920/16 or AT-GS920/8 ....................47 Installing the Switch in an Equipment Rack........................50 Guidelines for Installing the Switch in a Rack......................50...
  • Page 6 Contents What to Prepare for Installation in a Rack ......................50 Rack Installation of AT-GS920/24 ..........................50 Rack Installation of AT-GS920/16 or AT-GS920/8 ....................52 Cabling the Switch .................................57 Powering On the Switch ..............................58 Chapter 3: Installing the AT-GS920/8PS Switch ......................61 Installing the AT-GS920/8PS Switch on a Table ......................62 Installing theAT-GS920/8PS Switch in an Equipment Rack ..................63...
  • Page 7 Contents Root Switch ................................111 Non-root Switch ..............................112 Examples 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...

  • Page 9: Preface

    This Preface contains the following sections: “Safety Symbols 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: –...

  • Page 10: Safety Symbols Used In This Document

    GS920 Series Gigabit Ehternet Switch Installation and User’s Guide Safety Symbols Used in this Document This document uses the following conventions: Note Notes provide additional information. Caution Cautions inform you that performing or omitting a specific 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...

  • Page 11: Contacting Allied Telesis

    Preface Contacting Allied Telesis If you need assistance with this product, you may contact Allied Telesis technical support by going to the Support & Services section of the Allied Telesis web site at www.alliedtelesis.com/support. You can find links for the following services on this page: 24/7 Online Support - Enter our interactive support center to ...
  • Page 12 GS920 Series Gigabit Ehternet Switch Installation and User’s Guide...

  • Page 13: Chapter 1: Product Description

    Chapter 1 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: Key Features

    MAC address entries:  – AT-GS920/8 and AT-GS920/8PS: up to 4K – AT-GS920/16: up to 8K – AT-GS920/24: up to 8K Supports link down and cable length power saving function  Supports Multicast Frame Pass-Through which can be enabled or ...
  • Page 15 Chapter 1: Product Description RoHS Compliant  0 to 50 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 ...

  • Page 16: Gs920 Series Overview

     Each model uses an internal high efficiency PSU and a low power chipset to conform with the Allied Telesis commitment to environmentally friendly processes. They can all be installed on a desktop, mounted on a wall or mounted in a 19” rack.

  • Page 17: At-Gs920/16 Switch

    Figure 2. Figure 2. AT-GS920/24 Rear Panel AT-GS920/16 The AT-GS920/16 switch can be installed on a desktop, mounted on a wall, or in a 19-inch equipment rack. To mount the switch on the wall or an Switch equipment rack, you must order separate bracket kits.

  • Page 18: At-Gs920/8Ps Switch

    GS920 Series Gigabit Ehternet Switch Installation and User’s Guide Figure 5. AT-GS920/8 Front Panel The AT-GS920/8 switch has an internal power supply with a single AC power supply socket on the rear panel as shown in Figure 6. Figure 6. AT-GS920/8 Rear Panel AT-GS920/8PS The AT-GS920/8PS is a PoE switch that can be installed on a desktop, mounted on a wall, or mounted in a 19-inch equipment rack.

  • Page 19: Wall And Rack Mount Brackets

    Japan. all installations. For Japan installations, use the optional AT-BRKT-J22 Wall Mount Kit instead. AT-GS920/16 Use the optional AT-BRKT-J23 Use the optional AT-RKMT-J05 wall mount kit. optional 19” rack mount kit. AT-GS920/8...

  • Page 20: 10/100/1000 Base-Tx Twisted Pair Ports

    GS920 Series Gigabit Ehternet Switch Installation and User’s Guide 10/100/1000 The GS920 Series switches are equipped with multiple 10/100/1000Base-TX twisted pair ports Base-TX Twisted Pair Ports Connector All twisted pair ports feature 8-pin RJ-45 connectors. For the port pinouts, see “RJ-45 Twisted Pair Port Connectors” on page 99. Speed The ports are 10Base-T, 100Base-TX, and 1000Base-T compliant and capable of 10 Mbps, 100 Mbps, and 1000 Mbps speeds.

  • Page 21: Power Connector

    Chapter 1: Product Description MDI/MDI-X The default configuration for all of the twisted pair ports on the switch is auto-MDI/MDI-X where the ports automatically configure themselves as MDI or MDI-X when connected to an end-node. Auto-MDI/MDI-X is in effect when the ports are configured for Auto-Negotiation or 1000M/FULL. In this mode, you can use a straight-through twisted pair cable to connect any network device to a port.

  • Page 22: Configuration Switches And Led Descriptions

    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.

  • Page 23: Power Led

    Chapter 1: Product Description The following tables describe the LED groups on the GS920 Series switches: “Power LED”  “Loop Prevention LED” on page 23  “Port Mode LEDs” on page 24  “Port POE LEDs” on page 26  Power LED The Power LED indicates the status of the chassis power being ON or OFF.

  • Page 24: Vlan Type Leds (At-Gs920/8Ps Only)

    GS920 Series Gigabit Ehternet Switch Installation and User’s Guide VLAN Type When the Ethernet ports are being configured for the port-isolation VLAN feature, the VLAN Type LEDs indicate their configuration. See Table 6. LEDs (AT-GS920/8PS Table 6. VLAN LEDs Only) State Description In the Operation mode, Type 1 is enabled.

  • Page 25: Port Status Leds

    When the port speed 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 Port Status LEDs Two ports status LEDs are assigned to each port.

  • Page 26: Port Poe Leds

    GS920 Series Gigabit Ehternet Switch Installation and User’s Guide Table 8. Port Status LEDs for Normal and Configuration Modes Port LED Mode State Description Position Green Indicates the port is selected and Configuration eligible to be configured with front Blinking Mode Port Select panel DIP switches.

  • Page 27: At-Gs920 Feature Descriptions

    Chapter 1: Product Description AT-GS920 Feature Descriptions 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. This section discusses the following features: “Duplex Mode”...

  • Page 28: Multicast Frame Pass-Through

    GS920 Series Gigabit Ehternet Switch Installation and User’s Guide Multicast Frame The Multicast Frame Pass-Through function includes EAP, BPDU frame types and others. Pass-Through Note When Multicast Frame Pass-Through is enabled, the Flooding feature must be disabled. This feature can be enabled or disabled by setting DIP switch # 1 (MULTICAST PASSTHRU).

  • Page 29: Flooding

    Chapter 1: Product Description Flooding The Flooding mode allows all received legal frames to be switched through the GS920 Series switch. Note The Flooding mode has a higher priority and takes precedence over the Multicast Frame Pass-Through feature. If the Multicast Frame Pass-Through feature is desired, then the Flooding feature must be disabled.
  • Page 30 GS920 Series Gigabit Ehternet Switch Installation and User’s Guide 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.

  • Page 31: Chapter 2: Hardware Installation

    Chapter 2 Hardware Installation This chapter contains the following sections: “Reviewing Safety Precautions” on page 32  “Selecting a Site for the Switch” on page 36  “Planning the Installation” on page 37  “Unpacking the Switch” on page 38 ...

  • Page 32: Reviewing Safety Precautions

     are available in the PDF document Translated Safety Statements posted on the Allied Telesis website at alliedtelesis.com/support. 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.
  • Page 33 Chapter 2: Hardware Installation 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. ...
  • Page 34 GS920 Series Gigabit Ehternet Switch Installation and User’s Guide Warning Do not install the device on an unstable wall or a wall affected by vibration or impact. The device may fall and falling device may lead to damaging itself or causing injuries. ...
  • Page 35 Chapter 2: Hardware Installation Advertissement 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...

  • Page 36: Selecting A Site For The Switch

    GS920 Series Gigabit Ehternet Switch Installation and User’s Guide Selecting a Site for the Switch Observe the following requirements when choosing a site for the GS920 Series switch: If you plan to install the switch on a table, make sure that the table ...

  • Page 37: Planning The Installation

    Chapter 2: Hardware Installation Planning the Installation Table 11 contains the cabling specifications for the twisted pair ports. Table 11. Twisted Pair Cabling and Distances Maximum Speed Type of Cable Operating Distance 10 Mbps Category 3 or better unshielded 100 m (328 ft) twisted pair cable 100 Mbps Category 5 or unshielded twisted...

  • Page 38: Unpacking The Switch

    To unpack a GS920 Series switch, perform the following procedure: 1. Remove all components from the shipping package. Note Store the packaging material in a safe location. Allied Telesis recommends that you use the original shipping material to return the unit to Allied Telesis if required.

  • Page 39: Unpacking The At-Gs920/24 Bracket Kit

    Chapter 2: Hardware Installation Unpacking the The AT-GS920/24 also comes with the AT-GS920/24 Bracket Kit. Verify that all hardware components in your Bracket Kit are included as listed in AT-GS920/24 Table 13. Bracket Kit Note If you plan to install the AT-GS920/24 on a wall or in an equipment rack, use the AT-GS920/24 Bracket Kit provided in the shipping box with the switch.

  • Page 40: At-Gs920/16 Shipping Contents

    The contents of the AT-GS920/16 shipping box as shown in Table 14: Shipping Contents Note If you plan to install the AT-GS920/16 on a wall, you must order an AT-BRKT-J23 optional wall mount kit 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”...

  • Page 41: At-Gs920/8 Shipping Contents

    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...

  • Page 42: At-Gs920/8Ps Shipping Contents

    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...

  • Page 43: Installing The Switch On A Table Or Desktop

    Chapter 2: Hardware Installation 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. 2. Store the packaging material in a safe place. In the event a problem occurs and you need to return the unit, use as much of the original shipping material as possible.

  • Page 44: Installing The Switch On A Wall

     the shipping box in all locations except in Japan where you must purchase 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 ...

  • Page 45: Wall Installation Of At-Gs920/24

    Chapter 2: Hardware Installation Wall Installation To install the AT-GS920/24 switch on a wall for all installations everywhere except in Japan, perform the following procedure: of AT-GS920/24 Note To install the AT-GS920/24 switch on a wall in Japan, see “AT-GS920/24 Switch Wall Mount Installation” on page 101 for the installation instructions using the AT-BRKT-J22 Wall Mount Kit separately.
  • Page 46 GS920 Series Gigabit Ehternet Switch Installation and User’s Guide Figure 14. Marking the Screw Hole Locations Note Figure 14 shows the front panel oriented toward the right side. However, the switch can be mounted on the wall with the front panel facing left, right, up or down.

  • Page 47: Wall Installation Of At-Gs920/16 Or At-Gs920/8

    2. Verify that one pair of brackets is included in your wall mount package listed in Table 13. Table 17. Components in the AT-BRKT-J23 Wall Mount Kit Components One pair of brackets 3. If any item is missing or damaged, contact your Allied Telesis sales representative for assistance.
  • Page 48 GS920 Series Gigabit Ehternet Switch Installation and User’s Guide Installing a Switch Using the AT-BRKT-J23 Wall Mount Kit This section shows you steps to install a switch on a wall using the AT-BRKT-J23 kit. To install the switch on a wall, perform the following procedure: 1.
  • Page 49 Chapter 2: Hardware Installation 4. Pre-drill the marked locations on the wall at the locations marked in Step 3. 5. Install four plastic anchors into the wall in the holes drilled in Step 4. 6. Position brackets on the wall and drive screws through the holes to attach the brackets on the wall.

  • Page 50: Installing The Switch In An Equipment Rack

    To install the AT-GS920/16 or AT-GS910/8 switch, you must  purchase the rack 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 ...
  • Page 51 Chapter 2: Hardware Installation Figure 20. Attaching the Extension to the Bracket 3. If the rubber feet were previously installed, turn the switch upside down and place it on a table. Remove the rubber feet from the bottom of the switch using a Phillips-head screwdriver.

  • Page 52: Rack Installation Of At-Gs920/16 Or At-Gs920/8

    Figure 23. Attaching the Switch to an Equipment Rack 7. Proceed to “Cabling the Switch” on page 57. Rack Installation To install the AT-GS920/16 or AT-GS920/8 switch in an equipment rack using the AT-RKMT-J05 or AT-RKMT-J08 rack mount kit respectively, of AT-GS920/16...
  • Page 53 Table 18. Components in Rack Mount Kit Rack Mount Kit AT-RKMT-J05 AT-RKMT-J08 Two Short Brackets Handles Two Cable Brackets Two Long Brackets Eight M3x6mm screws Eight M4x6mm screws Tie-wrap 3. If any item is missing or damaged, contact your Allied Telesis sales representative for assistance.
  • Page 54 GS920 Series Gigabit Ehternet Switch Installation and User’s Guide Install a AT-GS920/16 or AT-GS920/8 Switch Using the AT-RKMT-J05 or AT-RKMT-J08 Rack Mount Kit This section gives the steps to install a switch in an equipment rack using the AT-RKMT-J05 or AT-RKMT-J08 kit.:...
  • Page 55 Chapter 2: Hardware Installation Figure 26. Attaching Cable Tray to Plates 6. Turn the switch over and place it on the work table. 7. Attach the units in Step 5 to the switch with M3x6mm screws using a Phillip-head screw driver as shown in Figure 27. Figure 27.
  • Page 56 GS920 Series Gigabit Ehternet Switch Installation and User’s Guide 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: Cabling The Switch

    Chapter 2: Hardware Installation Cabling the Switch After installing the switch on the desktop, connect twisted pair cables to the ports on the GS920 Series switch. When connecting a twisted pair cable to a port, observe the following guidelines: – An RJ-45 connector should fit snugly into the port on the switch.

  • Page 58: Powering On The Switch

    GS920 Series Gigabit Ehternet Switch Installation and User’s Guide Powering On the Switch To power on the switch, perform the following procedure: 1. Plug the power cord into the power connector on the back of the switch. 2. Plug the other end of the power cord into a wall outlet. Warning Power cord is used as a disconnection device.
  • Page 59 Chapter 2: Hardware Installation 3. The switch LEDs display an initial Power-ON sequence. See Figure 29. Figure 29. Initial Power-ON Sequence 4. After the Power-ON sequence completes, verify that the POWER LED is green. If the LED is OFF, see “Troubleshooting” on page 93. The switch is now powered on and ready for network operations.
  • Page 60 GS920 Series Gigabit Ehternet Switch Installation and User’s Guide 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: Chapter 3: Installing The At-Gs920/8Ps Switch

    Chapter 3 Installing the AT-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: Installing The At-Gs920/8Ps Switch On A Table

    Chapter 3: Installing the AT-GS920/8PS Switch Installing the AT-GS920/8PS Switch on a Table This section contains the procedure for installing the AT-GS920/8PS switch on a table or desk. Note The rubber feet on the bottom of the chassis should be left on for table installation.

  • Page 63: Installing Theat-Gs920/8Ps Switch In An Equipment Rack

    GS920 Series Gigabit Ehternet Switch Installation and User’s Guide Installing theAT-GS920/8PS Switch in an Equipment Rack You can install one AT-GS920/8PS witch in a row of the equipment rack or two AT-GS920/8PS switches in one row of the equipment rack as shown in Figure 31.
  • Page 64 Chapter 3: Installing the AT-GS920/8PS Switch Figure 32. Installing the AT-RKMT-J15 Tray in a n Equipment Rack 3. Turing the tray fixing screws on counterclockwise and pull out the tray. You can draw the tray to a maximum of 250mm from the tray chassis. Figure 33.

  • Page 65: Installing A Switch In One Row

    GS920 Series Gigabit Ehternet Switch Installation and User’s Guide Figure 34. Placing the AT-GS920/8PS Switch in the AT-RKMT-J15 Tray 5. Slide 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 To install the switch in one row of the equipment rack, you need the following items:...
  • Page 66 To install the switch in one row of the equipment rack, perform the following procedures. Caution The chassis may be heavy and awkward to lift. Allied Telesis recommends that you get assistance when mounting the chassis in an equipment rack.
  • Page 67 GS920 Series Gigabit Ehternet Switch Installation and User’s Guide 3. Attach the two rack mount brackets 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.

  • Page 68: Installing The At-Gs920/8Ps Switch On A Wall

    Chapter 3: Installing the AT-GS920/8PS Switch Installing the AT-GS920/8PS Switch on a Wall The AT-GS920/8PS switch can be mounted on a wall Guidelines Before installing the AT-GS920/8PS switch on a wall, review the following guidelines: If protective earthing is used as a safeguard, the instructions shall ...

  • Page 69: What To Prepare For Wall Installation

    GS920 Series Gigabit Ehternet Switch Installation and User’s Guide What to Prepare You need the following items to install the switch on a wall: for Wall Four AT-BRKT-J24 brackets  Installation 16 M4mm x 6mm screws to attach the brackets to the switch ...
  • Page 70 Chapter 3: Installing the AT-GS920/8PS Switch 3. While another person holds 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.

  • Page 71: Chapter 4: Switch Configuration

    Chapter 4 Switch Configuration This chapter includes the following topics: “Configuration Switch and LED Locations” on page 72  “Reseting Ports to Default Settings” on page 90  ”Feature Configuration”  – “Multicast Frame Pass-Through” on page 73 – “Energy Efficiency Ethernet (EEE)” on page 76 –...

  • Page 72: Configuration Switch And Led Locations

    GS920 Series Gigabit Ehternet Switch Installation and User’s Guide 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: Feature Configuration

    Chapter 4: Switch Configuration Feature Configuration The following features can be configured with the individual DIP switches: ”Multicast Frame Pass-Through”  “Energy Efficiency Ethernet (EEE)” on page 76  “Loop Prevention” on page 78  “Flooding” on page 80  “Flow Control”...
  • Page 74 GS920 Series Gigabit Ehternet Switch Installation and User’s Guide Figure 43. DIP Switch Setting for Enabling Multicast Frame Pass-Through 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 Multicast Frame Pass-Through feature is enabled.
  • Page 75 Chapter 4: Switch Configuration Disabling Multicast Frame Pass-Through Perform the following procedure to disable the Multicast Frame Pass-Through feature: 1. Set DIP switch # 1 to the DOWN position to disable this feature. See Figure 44. Figure 44. DIP Switch Settings for Disabling Multicast Frame Pass-Through 2.

  • Page 76: Energy Efficiency Ethernet (Eee)

    GS920 Series Gigabit Ehternet Switch Installation and User’s Guide Energy Efficiency DIP switch # 2 enables or disables the EEE feature. See Figure 42, “Front Panel Configuration Switches and LEDs” on page 72 for the DIP switch Ethernet (EEE) location on the front panel. Enabling EEE Perform the following procedure to enable the EEE feature: 1.
  • Page 77 Chapter 4: Switch Configuration Table 19. EEE Support for Port Speed/Link Configuration Supported Speed/Link Unsupported Speed/Link 100M Full Duplex 1000M Auto-Negotiation 100M Half Duplex 100M Auto-Negotiation 10M Full Duplex 10M Half Duplex Disabling EEE Perform the following procedure to disable the EEE feature: 1.

  • Page 78: Loop Prevention

    GS920 Series Gigabit Ehternet Switch Installation and User’s Guide Loop Prevention DIP switch # 3 enables or disables the Loop Prevention feature. See Figure 42, “Front Panel Configuration Switches and LEDs” on page 72 for the DIP switch location on the front panel. Enabling Loop Prevention Perform the following procedure to enable the Loop Prevention feature: Note...
  • Page 79 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.

  • Page 80: Flooding

    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 procedure to enable the Flooding feature: 1.
  • Page 81 Chapter 4: Switch Configuration 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 Flooding is enabled on all of the Ethernet ports.

  • Page 82: Flow Control

    GS920 Series Gigabit Ehternet Switch Installation and User’s Guide Flow Control DIP switch # 5 enables or disables the Flow Control feature. See Figure 42, “Front Panel Configuration Switches and LEDs” on page 72 for the DIP switch location on the front panel. Note Loop Detection must be disabled when the Flow Control feature is enabled.
  • Page 83 Chapter 4: Switch Configuration Disabling Flow Control Perform the following procedure to disable the Flooding feature: 1. Set DIP switch # 5 to the DOWN position to disable this feature. See Figure 52. Figure 52. DIP Switch Settings for Disabling Flow Control 2.

  • Page 84: Ethernet Port Configuration

    GS920 Series Gigabit Ehternet Switch Installation and User’s Guide Ethernet Port Configuration The AT-GS920 switch ports can be configured for the speed, duplex mode, and MDI/MDIX settings. The ports can be configured all together or individually. See Table 20 for more details. Table 20.

  • Page 85: Configuring All Ports With The Same Speed And Duplex Settings

    Chapter 4: Switch Configuration Figure 53. DIP Switch Settings for Configuring All Ports 3. Push the MODE button for less than 1 second to select a pre-configured port configuration setting. You can select one from six pre-configured settings; – Auto-Negotiation –...
  • Page 86 GS920 Series Gigabit Ehternet Switch Installation and User’s Guide 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.

  • Page 87: Configuring An Individual Port With Speed And Duplex

    Chapter 4: Switch Configuration Figure 55. DIP Switch Settings for Configuring an Individual Port 3. Press the NEXT PORT button to select the port you want to configure. Each time you press the NEXT PORT button, the next port is selected. When a port is selected, its SDP/LOOP LED flashes indicating that this port is ready to be configured.

  • Page 88: Configuring All Ports With Auto Or Force Mdi/Mdi-X

    GS920 Series Gigabit Ehternet Switch Installation and User’s Guide 5. Repeat Step 3 and Step 4 if you want to configure other ports. 6. After all the ports are individually configured, set DIP switch # 6 (OPERATION/CONFIG) to the DOWN (OPERATION) position. The switch is now in the port operational mode.

  • Page 89: Configuring An Individual Port With Auto Or Force Mdi/Mdi-X

    Chapter 4: Switch Configuration Configuring All The ports can be configured for Auto MDI/MDI-X or Force MDI/MDI-X on all ports together. For more information, see “Force MDI/ MDI-X and Auto Ports with Auto MDI/MDI-X” on page 84. or Force MDI/ To change the MDI/MDI-X setting on all ports together, perform the MDI-X following procedures:...
  • Page 90 GS920 Series Gigabit Ehternet Switch Installation and User’s Guide Configuring The ports can be individually configured for Auto MDI/MDI-X or Force MDI/MDI-X. For more information, see “Force MDI/ MDI-X and Auto MDI/ Individual Ports MDI-X” on page 84. with Auto or To change the MDI/MDI-X setting on an individual port, perform the Force MDI/ following procedures:...

  • Page 91: Reseting Ports To Default Settings

    Chapter 4: Switch Configuration Note This new configuration only takes effect after turning the switch OFF and then back ON. Reseting Ports to To return to the default configuration, perform the following procedure: Default Settings Note For the default values, see Table 20 on page 84. 1.
  • Page 92 GS920 Series Gigabit Ehternet Switch Installation and User’s Guide...

  • Page 93: Chapter 5: Troubleshooting

    If you are still unable to resolve the problem after following the instructions in this chapter, contact Allied Telesis Technical Support for assistance. Refer to “Contacting Allied Telesis” on page 11. Check the POWER LED on the front of the switch. If the LED is OFF,...
  • Page 94 GS920 Series Gigabit Ehternet Switch Installation and User’s Guide...

  • Page 95: Appendix A: Technical Specifications

    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...

  • Page 96: Safety

    GS920 Series Gigabit Ehternet Switch Installation and User’s Guide Safety 60950-1 (cULus) UL, cULus 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: Electromagnetic Emissions Certifications

    Appendix A: Technical Specifications Electromagnetic Emissions Certifications EMI (Electro (Class A) AT-GS920/8PS Magnetic (Class B) AT-GS920/8 (Class B) AT-GS920/16 Interference) (Class A) AT-GS920/24 US ICES-003 Class A or (Class A) AT-GS920/8PS (Class B) AT-GS920/8 (Class B) AT-GS920/16 (Class A) AT-GS920/24 CA...

  • Page 98: Ems (Electromagnetic Susceptibility) En55024:2010

    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-GS920/16 100 - 240 VAC, 0.30 A 50/60 Hz AT-GS920/24 100 - 240 VAC, 0.40 A 50/60 Hz...

  • Page 99: Rj-45 Twisted Pair Port Connectors

    Appendix A: Technical Specifications RJ-45 Twisted Pair Port Connectors This section lists the connectors and connector pinouts for the AT-GS920 series switch and its components. Figure 56 illustrates the physical pin layout to an RJ-45 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.
  • Page 100 GS920 Series Gigabit Ehternet Switch Installation and User’s Guide Table 24 lists the pin signals when a port is operating at 1000 Mbps. Table 24. Pin Signals (1000 Mbps) Signal Pair Name TX+_D1 TX-_D1 RX+_D2 BI+_D3 BI-_D5 RX-_D2 BI+_D4 BI-_D4...

  • Page 101: Appendix B: At-Gs920/24 Switch Wall Mount Installation

    Appendix B AT-GS920/24 Switch Wall Mount Installation This appendix explains the procedures for this installation using the AT-BRKT-J22 wall mount kit. It contains the following sections: “Unpacking the AT-BRKT-J22 Wall Mount Kit” on page 102  “Installing a Switch Using the AT-BRKT-J22 Wall Mount Kit” on ...

  • Page 102: Unpacking The At-Brkt-J22 Wall Mount Kit

    2. Verify that One pair of brackets is included in your wall mount package listed in Table 25. Table 25. Components in the AT-BRKT-J22 Wall Mount Kit Description Components Two pairs of brackets 3. If any item is missing or damaged, contact your Allied Telesis sales representative for assistance.

  • Page 103: Installing A Switch Using The At-Brkt-J22 Wall Mount Kit

    Chapter : AT-GS920/24 Switch Wall Mount Installation Installing a Switch Using the AT-BRKT-J22 Wall Mount Kit This section shows you steps to install a switch on a wall using the AT-BRKT-J22 kit. What to Prepare Before installing a switch on a wall, make sure that the following items are ready.
  • Page 104 GS920 Series Gigabit Ehternet Switch Installation and User’s Guide 3. Have another person hold the switch with the brackets at the wall location 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.
  • Page 105 Chapter : AT-GS920/24 Switch Wall Mount Installation 6. Position brackets on the wall and drive screws through the holes to attach the brackets on the wall. See Figure 59. Figure 59. Driving the Screws through the Holes 7. Make sure that the two brackets are installed securely. 8.
  • Page 106 GS920 Series Gigabit Ehternet Switch Installation and User’s Guide 9. Place the other two brackets on the top of the switch and mark the screw hole locations with a pencil as shown in Figure 61. Figure 61. Marking the Screw Hole Locations 10.
  • Page 107 Chapter : AT-GS920/24 Switch Wall Mount Installation 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...
  • Page 108 GS920 Series Gigabit Ehternet Switch Installation and User’s Guide...

  • Page 109: Appendix C: Loop Prevention Feature

    Appendix C Loop Prevention Feature The following sections are contained in this appendix: “Guidelines for Loop Prevention” on page 110  “Root Switch” on page 111  “Detecting and Blocking a Loop” on page 113  “Hop Count Limitation” on page 117 ...

  • Page 110: Guidelines For Loop Prevention

    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 Telesis recommends designing the network with 10 or less cascade levels when building a Loop Prevention-enabled network.

  • Page 111: Root Switch

    AT-GS920/24 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 root switch, it is responsible for sending out Loop Prevention frames. A loop condition exists if the root switch receives a Loop Prevention frame that it generates itself.

  • Page 112: Non-Root Switch

    GS920 Series Gigabit Ehternet Switch Installation and User’s Guide Non-root Switch If a switch is not selected as the Loop Prevention root switch, then it is a non-root switch. A non-root switch updates the hop count in the Loop Prevention frames before forwarding them. It also maintains a timer for each of the switch’s ports.

  • Page 113: Detecting And Blocking A Loop

    4. Among the ports with the same hop count and on the same switch: – For the AT-GS920/8 switch, a port with the smaller port number – For the AT-GS920/8PS, AT-GS920/16, and AT-GS920/24 switches, a port with the larger port number...

  • Page 114: Port Blocked Within A Lan

    GS920 Series Gigabit Ehternet Switch Installation and User’s Guide Port Blocked When a loop is detected in the example shown in Figure 65, Port 8 on the Switch C is blocked to relieve the loop. This port has the largest hop count Within a LAN from the root switch.

  • Page 115: Port Blocked On One Switch

    See Figure 68 as an example. Figure 68. Blocked Port on One AT-GS920/8 Switch When a loop occurs within one AT-GS920/16 or AT-GS920/24 switch, Loop Prevention blocks the port with the larger port number. See Figure 69 as examples.

  • Page 116: Blocking A Port Affected By An External Loop

    GS920 Series Gigabit Ehternet Switch Installation and User’s Guide Blocking a Port In the example shown in Figure 70, Switch A is the only switch that has Loop Prevention enabled in the LAN and the other switches in the LAN Affected by an have Loop Prevention disabled.

  • Page 117: Hop Count Limitation

    AT-GS920/8 AT-GS920/16 AT-GS920/24 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.
  • Page 118 GS920 Series Gigabit Ehternet Switch Installation and User’s Guide...

This manual is also suitable for:

At-gs920/24At-gs920/8Gs920 seriesAt-gs920/8psAtgs920 series

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