B-62694EN/03
APPENDIX C. ETHERNET TECHNICAL TERMS
part.
And you can’t set that all octets are equal to 0 or 255 in the
Network address part and the Host address part.
The IP address is managed worldwide. So, in order to use the
IP address you must get the IP address from the
international organization.
But if your network is a local closed network, you can
manage the IP addresses in your responsibility.
And the IP address having the following Network address
part can be used in a local closed network without permission
from the international organization. So, if your network is a
local closed network, we recommend that you use these IP
addresses.
CLASS Network address part
CLASS A 10
CLASS B From
172.16 to
172.31
CLASS c From 192.168.0 to 192.168.255
MASK ADDRESS
This is the mask value for showing the Network address part
in the IP address.
In case of the CLASS A, you specify “255.0.0.0”.
In case of the CLASS B, you specify “255.255.0.0”.
In case of the CLASS C, you specify “255.255.255.0”.
MAC ADDRESS (ETHERNET ADDRESS)
This address is used in order to distinguish the each devices
in MAC Layer. The maker creating the communication
control board gets the unique MAC address from the
international organization.
In case of Data Server, we affix the seal printed as the “ADR”
on the Data Server board. You must set this MAC address to
the Data Server.
HEARTBEAT (SQE TEST) FUNCTION
In the standard of “Ethernet” or “IEEE802.3”, when
transmitting the data into the network, a node checks that
other devices don’t communicate in the network.
If the devices start transmitting the data simultaneously, the
collision of the data occurs. The frequent collision makes the
real transmission rate less.
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