Filter
Top Products
14
Precautions Section 1-8
1-8 Precautions
Be sure to observe the following precautions when installing and using an
Ethernet Unit.
1-8-1 Installation
Observe the following precautions when installing an Ethernet System. (Refer
to Section 3 Installation and Initial Setup for details.)
1,2,3... 1. Use transceiver cable that meets IEEE802.3 standards to ensure high
noise resistance.
2. Use a transceiver with a current consumption of not more than 0.4 A per
port.
3. Always turn off the power supply to the PC before connecting or discon-
necting the transceiver cable.
4. Be sure not to exceed the current capacity of the Power Supply Unit on the
Rack to which the Ethernet Unit is mounted. The current consumption of
the CS-series Ethernet Units is 400 mA maximum and the current con-
sumption of the CJ-series Ethernet Unit is 380 mA maximum. This value
added to the current consumption of all other Units mounted to the same
Rack must not exceed the capacity of the Power Supply Unit.
5. Do not install the transceiver cables or coaxial cables of the Ethernet Sys-
tem near power supply lines. If installation near possible sources of noise
is unavoidable, install the cables in grounded metal ducts or take other
measure to eliminate noise interference.
1-8-2 Ethernet and IEEE802.3 Standards
The Ethernet Unit was designed based on version-2 Ethernet standards and
not on the international IEEE802.3 standards, which were developed based
on Version-2.0 Ethernet specifications. Although these two sets of standards
are similar, they are not necessarily the same. Particularly, different frame for-
mats are used, making direct communications impossible between systems
that do not support the same standards. Standards for equipment used to
configure networks are the same, allowing IEEE802.3-standard equipment to
be used with the Ethernet Unit. Particularly the transceiver cable for the
IEEE802.3 standards provides superior noise resistance and should be used
for the Ethernet Unit.
Terminology also differs between Version-2.0 Ethernet and IEEE802.3 stan-
dards. These differences are shown in the following table. Version-2.0 Ether-
net terminology is used in this manual.
Version-2 Ethernet IEEE802.3
Transce iver MAU
Transceiver cable AUI
Ethernet address MAC address
Ethernet 10Base-5/10Base-T