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 NJ240FX. The default setting of the NJ240FX 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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3Com NJ240FX manual Changing Device Configuration