3Com PS Hub 40, User Manual

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4 G
LOSSARY
segment switch The internal switch in a PS Hub 50. It connects the four cascaded
segments so that devices connected to the cascaded segments can
communicate through the segment switch. The segment switch works
by learning addresses and storing them in a switch database, which it
can refer to and selectively forward on information. The PS Hub 50
unit’s segment switch has two operating modes; LOI and bridge.
segments The separate networks within a PS Hub to which the ports can be
switched. The segments can be connected to or isolate from the
cascade segments (which extend the segments across other PS Hubs).
SLIP
Serial Line Internet Protocol. A protocol which allows IP to run over a
serial line connection.
SmartAgent ® Intelligent management agents in devices and logical connectivity
systems that reduce the computational load on the network
management station and reduce management-oriented traffic on the
network.
SNMP Simple Network Management Protocol. A protocol originally designed
to be used in managing TCP/IP internets. SNMP is presently
implemented on a wide range of computers and networking
equipment and may be used to manage many aspects of network and
end-station operation.
stack A group of hubs which are connected together in such a way that they
function as a single logical repeater.
standby port The port in a resilient link that takes over data transmission if the main
port in the link fails.
switch See segment switch .
switch database The database that the PS Hub 50 unit’s segment switch uses to store
addresses in so that it can refer to it when forwarding network traffic.
The switch database can contain learnt addresses and permanent
addresses.
TCP/IP A layered set of communications protocols providing Telnet terminal
emulation, FTP file transfer, and other services for communication
among a wide range of computer equipment.