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(3) Switching hub
The switching hub means the hub that controls traffics at exchanging packets (communication data)
among plural networks, and send packets to a specified address.
Different from ordinary hubs, it carries out one-to-one communications among respective ports,
accordingly, even when one set of ports is communicating, other ports can communicate freely. By this
function, conflict of signals can be restricted, and network performance can be improved.
Fig. 6-2 shows the differences between an ordinary hub and a switching hub.
When communication is made from the personal computer at 192.168.1.2 to the personal computer at
192.168.1.3, in the case of an ordinary hub, communication is sent also to the personal computer at
192.168.1.1. While, in a switching hub, communication is sent to only the destination that you want to
communicate.
6.3.3 LAN wire length
A 10BASE-T network connected to the G-50A may have a maximum wire length of 100m as detailed in
chapter 4.1.
Consequently, when the LAN wire length exceeds 100m, the use of hubs will extend the maximum length
to 500m.
Notice
● Be sure to always use a hub.
● Restrictions apply to the number of cascade connections when using hubs. Please
observe these restrictions.
100m
HUB HUB HUB HUB
500m
G-50A
Centralized
control PC
Transmitting communication
to all routes
Not transmitting to routes except
that desired by switching.
Ordinary HUB
192.168.1.1 192.168.1.2 192.168.1.3 192.168.1.1 192.168.1.2 192.168.1.3
Switching
Figure 6-2 Switching hub concept
Notice
● By use of a switching hub, it is possible to add hubs exceeding the connection stage
restrictions specified in the section 6.3.3, and to expand the distance.
Example: In the case where 2-stage cascade connection is made by 100 Base-TX
repeater hub or the like, by use of a switching hub, the hub can be
connected to 2-stage cascade.
●
When to connect 2 switching hubs, there is logically no restriction in the number of cascade
connection stages, cable length (between nodes) or so. However, if the load of network
becomes extremely high, delay may result, causing network connection problems.
● As for the details of switching hub, refer to the operation manual attached to each
switching hub.