Schweitzer Engineering Laboratories SEL-421-4 - Figure 2.54 100 BASE-FX and 10;100 BASE-T Port Configuration on Ports 5 C and 5 D; Figure 2.53 Two 10;100 BASE-T Port Configuration on Ports 5 C and 5 D; Figure 2.52 Two 100 BASE-FX Port Configuration on Ports 5 C and 5 D; Figure 2.51 100 BASE-FX and 10;100 BASE-T Port Configuration on Ports 5 A and 5 B

2.49
Date Code 20171021 Instruction Manual SEL-421 Relay
Installation
Connection
Twisted-Pair Networks
NOTE: Use caution with UTP cables
as these cables do not provide
adequate immunity to interference in
electrically noisy environments unless
additional shielding measures are
employed.
While Unshielded Twisted Pair (UTP) cables dominate office Ethernet networks,
Shielded Twisted Pair (STP) cables are often used in industrial applications. The
SEL-421 Ethernet card is compatible with standard UTP cables for Ethernet net-
works as well as STP cables for Ethernet networks.
Typically UTP cables are installed in relatively low-noise environments including
offices, homes, and schools. Where noise levels are high, you must either use
STP cable or shield UTP using grounded ferrous raceways such as a steel con-
duit.
Figure 2.49 Two 100BASE-FX Port Configuration on Ports 5A and 5B
Figure 2.50 Two 10/100BASE-T Port Configuration on Ports 5A and 5B
Figure 2.51 100BASE-FX and 10/100BASE-T Port Configuration on Ports 5A
and 5B
Figure 2.52 Two 100BASE-FX Port Configuration on Ports 5C and 5D
Figure 2.53 Two 10/100BASE-T Port Configuration on Ports 5C and 5D
Figure 2.54 100BASE-FX and 10/100BASE-T Port Configuration on Ports 5C
and 5D
WARNING
Do not perform any procedures or
adjustments that this instruction
manual does not describe.
WARNING
During installation, maintenance, or
testing of the optical ports, use only
test equipment qualified for Class 1
laser products.
WARNING
Incorporated components, such as
LEDs and transceivers are not user
serviceable. Return units to SEL for
repair or replacement.