ZyXEL Communications GS1200 Series User Manual page 45

8.1.1.2 Broadcast Storm Control
Broadcast storm control limits the number of broadcast packets the Switch receives per second on the
ports. When the maximum number of allowable broadcast packets is reached per second, the
subsequent packets are discarded. Enable this feature to reduce broadcast packets in your network.
You can specify limits on each port.
8.1.1.3 Port Isolation
Port isolation means that each port can only communicate with the uplink (out-going) port and cannot
communicate with each other. All incoming ports are selected while only the uplink port is selected. An
uplink port is a port through which a data packet leaves. An incoming port is a port through which a
data packet enters. This option is the most limiting but also the most secure.
Figure 33 Port Isolation
For example, if you have computers grouped together in a VLAN that communicates with servers in
other networks. These computers have no need to communicate together, so it is best to block
unwanted communication.
8.1.1.4 Bandwdith Control
Bandwidth control means defining a maximum allowable bandwidth for incoming and/or out-going
traffic flows on a port.
8.1.1.5 PoE (GS1200-5HP v2 and GS1200-8HP v2)
The Switch supports both the IEEE 802.3af Power over Ethernet (PoE) and IEEE 802.3at High Power over
Ethernet (PoE) standards. A PoE-enabled switch is a Power Sourcing Equipment (PSE), because it
provides a source of power through its Ethernet ports. A powered device (PD) is a device such as an
access point, IP phone, or IP camera, that receives PoE (Power over Ethernet) power from a PSE through
its Ethernet port.
In the figure below, the IP camera and IP phone are PDs getting their power directly from the Switch PSE.
Aside from minimizing the need for cables and wires, PoE removes the hassle of trying to find a nearby
electric outlet to power up devices.
Chapter 8 Port
GS1200 Series User's Guide
45