3Com NJ220 manual Changing Device Configuration

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Changing Device Configuration

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transmissions in the Property window because it is unlikely that the IntelliJack will drop any Ethernet Packets.

If you believe that the IntelliJack is dropping Ethernet packets, you may want to configure the Counter Mode to count received errors (Rx Errors) and transmission collisions (Tx Collisions). This will give you a good sense of whether packets are actually being dropped.

10To change the Power Forwarding setting, click the box and select an option from the drop list.

IEEE 802.3af is the recognized standard for Power over Ethernet (POE) and the default setting. More and more network devices that are POE capable are adhering to this standard.

The IntelliJack’s Power over Ethernet capability also lets you forward power to a standards-compliant device plugged into Port 1 of the NJ220. The default setting of the NJ220 is auto-detect. We recommend that you keep this setting as part of your configuration to ensure that power will only be forwarded to devices capable of receiving it.

The IEEE802.3af standard requires a powered device to present a signature to the power sourcing equipment. The power sourcing equipment will check this signature and will only apply power to the line when it sees the correct signature.

If you want to ensure that power will not be forwarded at all, however, you could select Force power OFF to any device connected to Port 1.

Select Force power ON if you always want to apply power to any device plugged into Port 1. This option would let you power devices plugged into Port 1 that do not have the signature required by IEEE802.3af-compliant power sourcing equipment.

WARNING: By forcing power ON, you may damage equipment that is inadvertently plugged into Port 1, such as a device that is not designed to handle 48V.

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Contents 3Com IntelliJack Switch NJ220 Campus Drive 3Com CorporationMarlborough, MA 01752-3064Contents Troubleshooting the NJ220 Installing the NJ220 Intellijack Using a particular port Following diagram shows the back view of the IntelliJack Component Purpose 3C Numbers Before You BeginInstalling Using a Multi-port Ethernet Power Supply Using an Integrated Switch with Power Over EthernetSupply Using the 3Com Local Power Supply Using a Single-port Ethernet Power SupplyInstalling the NJ220 Intellijack Commercial Building Telecommunications Cabling Standard Installing the NJ220 Intellijack Installing the IntelliJack Installing the NJ220 Intellijack IntelliJack Connecting Devices toChecking the LEDs DescriptionInstalling the NJ220 Intellijack Installing Configuration Managers Installing the Configuration Managers Installing the Local and Central Configuration Managers Installing the Configuration Managers Installing the Local and Central Configuration Managers Installing the Configuration Managers Installing the Web Http//java.sun.com Http//YourServerIPAddress8080/3ComIJNJ/main/index.jsp Installing the Configuration Managers Using Local Configuration Manager Using the Local Configuration Manager Setting Advanced Using the Local Configuration Manager Using Central Configuration Manager Using the Central Configuration Manager Discovering NJ220 Devices on Your Network Using the Central Configuration Manager Viewing Device Port Information General TabProduct Information Hardware Settings Viewing Device Properties Using the Central Configuration Manager Statistics Log Snmp Settings Advanced Settings Alert Level Notifying Event Changing Device Identification Settings General ConfigurationChanging Device Configuration Port Based Settings Priority & Vlan ConfigurationOther Priority & Vlan Settings Using the Central Configuration Manager Password Security Configuration802.1X Using the Central Configuration Manager Changing Device Configuration Snmp Configuration Event Alert Levels Advanced ConfigurationPort Based Controls Global Setting Default Value Restoring Default ValuesPriority Option Multiplier Rate limiting option Port Setting Default Value Changing Device Configuration Using the Central Configuration Manager Finding Computers Upgrading the NJ220 Upgrading the NJ220 Firmware Using the Central Configuration Manager Upgrading the NJ220 Firmware Using the Central Configuration Manager Troubleshooting the NJ220 Troubleshooting the NJ220 Your 3COM Products Access Software Asia, Pacific Rim Telephone Technical Support and Repair Country Telephone NumberUS and Canada Telephone Technical Support and Repair Contract requests emeacontract@3com.comNetwork Interface HardwarePerformance MIB Support FeaturesEnvironment Standards ConformanceFfffffffffff Rmon CountersCollisions are not included but are counted in the Excessive Page Product Specifications Regulatory Information Japan Vcci Compliance