3Com NJ240FX manual Port Based Controls, Alert Level Notifying Event

	Changing Device Configuration 47
Alert Level	Notifying Event
Level 2: Allow standard alerts	Device Power Failure/Reboot
	Abnormal Reboot
	IP Address Change
	Unauthorized Access
Level 3: Allow all alerts	Device Power Failure/Reboot
	Abnormal Reboot
	IP Address Change
	Unauthorized Access
	Normal Reboot
	NBX phone plugged in
	NBX phone removed

Port Based Controls

39For the next three settings, first select the port you want to configure.

40You can turn on Flow Control for a specific port. Setting Flow Control to Off (the default setting) allows full passage of traffic regardless of how quickly it is processed by the IntelliJack.

You may want to turn Flow Control On if you discover that large amounts of traffic are being sent to the IntelliJack and it is dropping Ethernet packets. The Flow Control sends a message to the upstream switch the IntelliJack is connected to, telling it to slow down the rate at which it forwards traffic. This will slow down the network.

41The IntelliJack has the ability to configure AutoMDI[X]. Manual MDI configuration (the default value) assumes that the patch cords between the IntelliJack’s PAN port and the device it’s plugged into are straight-through cables (not cross-over cables).

If you use cross-over cables to connect devices to your network, you would need to set this option to Manual MDIX Configuration so that network traffic can pass between the device and the PAN port of the IntelliJack.

42You may want change the Data Rate Control options for either ingress or egress traffic. The default settings allow all types of traffic to pass through the IntelliJack at full bandwidth.

You can change the frame limitations to slow down or block particular types of traffic. For example, you may want to allow unicast traffic to pass at full bandwidth but restrict broadcast traffic because you are concerned about a type of network activity that triggers unwanted broadcast storms. With the Data Rate Control, you can configure the IntelliJack to only allow unicast traffic to pass.

With Data Rate Control settings, you can reduce the network traffic speed on the IntelliJack to as little as 128 Kbps. This can be useful if the machine is in a public area where you only want to provide a minimum speed connection.

Even though there are only eight rate limiting choices in the pull-down menu, you can actually increase the number of options you have by setting the Priority Levels on the Priority and VLAN Configuration tab.