About Lan; Lan Types; About The Hub - Mitsubishi Electric G-50A Technical Manual

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
LAN cable standard
10BASE-5
10BASE-2
10BASE-T
100BASE-Tx
(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

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-T
100BASE-Tx
34
Cable specifications
Standard coaxial cable
Fine-core coaxial cable
Twisted pair cable (T)
Twisted pair cable (T)
Use
For telephone
For telephone, Apple Talk
10BASE-T, token ring
Token ring
10BASE-T, 100BASE-T
Possible no. of connection steps
4 steps
2 steps
Maximum wire length Communication speed
500m 10Mbps
185m 10Mbps
100m 10Mbps
100m 100Mbps
Communication speed
4Mbps
10Mbps
16Mbps
100Mbps