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6.3 About LAN
6.3.1 LAN types
For the LAN cable, a 10BASE-T type is recommended.
As for the category, from the point of view of availability and the development of mixed systems with optical
cables, the use of category 5 is recommended.
(1) Main cable type
6.3.2 About the hub
For the hub, there are a variety of models including the 10BASE-T/100BASE-Tx automatic switching type
(switching hub), the exclusive 10BASE-T hub and the exclusive 100BASE-Tx hub. When using the G-50A,
please select a 10BASE-T type.
(1) What is a cascade connection?
The term cascade connection refers to a series of hierarchical connections where multiple hubs are
interconnected using cables and where ports can be added.
(2) Cascade connection step restriction
As the number of cascade steps increases, the transmission delay increases, making it impossible to
distinguish the signal (collision signal) to recognize other devices. To prevent this, restrictions for the
number of connection steps apply as follows.
LAN cable standard
10BASE-5
10BASE-2
10BASE-T
100BASE-Tx
Maximum wire length
500m
185m
100m
100m
Communication speed
10Mbps
10Mbps
10Mbps
100Mbps
Cable specifications
Standard coaxial cable
Fine-core coaxial cable
Twisted pair cable (T)
Twisted pair cable (T)
(2) EIA/TIA568 (category)
For the twisted pair cable, there are classifications standards determined by EIA/TIA. For Ethernet, 5
and 3 are used. The categories are divided by communication speed used where a speed of 10 times
that of category 3 can be used with category 5.
Category
Category 1
Category 2
Category 3
Category 4
Category 5
Communication speed
4Mbps
10Mbps
16Mbps
100Mbps
Use
For telephone
For telephone, Apple Talk
10BASE-T, token ring
Token ring
10BASE-T, 100BASE-T
LAN cable standard
10BASE-T
100BASE-Tx
Possible no. of connection steps
4 steps
2 steps