Black Box Modular Switches Manual De Usuario

Black Box Modular Switches           

        Installation and User Guide (8/99) 

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This chapter describes the functions and operation of the LE14XXA-Series. 

A LE14XXA-Series provides switched connectivity at Ethernet wire-speed among all 

of its ports.  The LE14XXA-Series supports10/100Mbs for copper media and 10 or 100Mb 

separate traffic domain for fiber port to maximize bandwidth utilization and network 

performance.  All ports can communicate to all other ports in a LE14XXA-Series, but local 

traffic on a port will not consume any of the bandwidth on any other port. 

LE14XXA-Series units are plug-and-play  devices.  There is no software configuring to 

be done at installation or for maintenance. The only hardware configuration settings are user 

options for UP-LINK on RJ-45 4-port. Half / Full duplex mode and 10 or 100Mbps selection for 

the switched ports can be done through jumper settings inside the unit. The internal functions of 

both are described below. 

Each time a packet arrives on one of the switched ports, the decision is taken to either 

filter or to forward the packet. Packets whose source and destination addresses are on the same 

port segment will be filtered, constraining them to one port and relieving the rest of the network 

from processing them. A packet whose destination address is on another port segment will be 

forwarded to the appropriate port, and will not be sent to the other ports where it is not needed.  

Traffic needed for maintaining the operation of the network (such as occasional multi-cast 

packets) are forwarded to all ports. 

 

The LE14XXA-Series Switches operate in the store-and-forward switching mode, 

which eliminates bad packets and enables peak performance to be achieved when there is heavy 

traffic on the network. 

All 16-port  LE14XXA-Series units have address table capacity of 24K node addresses 

(12K for 8-port models), suitable for use in large networks. They are self-learning, so that as