7.6
SEL-751 Relay Instruction Manual Date Code 20170927
Communications
Communications Interfaces
Autonegotiation, Speed, and Duplex Mode
Single or dual copper Ethernet ports can autonegotiate to determine the link
speed and duplex mode. Accomplish this by setting the NETASPD and
NETBSPD (network speed) to AUTO. You can also set single or dual copper
ports to specific speeds so that you can apply them in networks with older
switch devices. However, the relay ignores the speed settings for fiber
Ethernet ports. The relay hardware fixes the single and dual fiber Ethernet
ports to work at 100 Mbps and full duplex mode.
NETPORT Selection
The NETPORT setting gives you the option of selecting the primary port of
communication in failover or fixed communications modes.
IRIG-B
The SEL-751 has three different physical interfaces, depending on the model
options, to provide demodulated IRIG-B time-code input for time
synchronization. If the relay has multiple options for IRIG-B input, you can
use only one input at a time. Connection diagrams for IRIG-B and settings
selection are in Figure 7.4 through Figure 7.8 in this section.
Option 1: Terminals B01 and B02
This input is available on all models except models with dual Ethernet Port or
Fiber-Optic Ethernet port. Refer to Figure 7.4 for a connection diagram.
B01–B02 IRIG-B input is available on all models except those with fiber-optic Ethernet or dual-
copper Ethernet.
You cannot bring IRIG-B via Port 2 or 3 if you use the B01–B02 input.
Set Global setting IRIG TIME SOURCE to TIME_SRC := IRIG1.
Figure 7.4 IRIG-B Input (Relay Terminals B01–B02)
Option 2: Port 3 (EIA-232 Option Only)
Connect to an SEL communications processor with SEL Cable C273R to
bring IRIG-B input with the EIA-232 port. Refer to Figure 7.5 for a
connection diagram. Refer to Figure 7.6 on how to connect an SEL time
source (SEL-2401, SEL-2404, SEL-2407) for IRIG-B input to Port 3.
Table 7.2 PRP Settings
Setting Name Range Units
Default
Value
Setting Description
PRPTOUT 400–10000 ms 500 PRP Entry Timeout
PRPADDR 0–255 0 The multicast MAC address of
PRP supervision frames is
01-15-4E-00-01-XX where XX is
specified by this setting in deci-
mal notation as 0–255
PRPINTV 1–10 seconds 2 PRP Supervision TX Interval
SEL-2401
SEL-2404
or
SEL-2407
SEL-751
+ IRIG
– IRIG
SEL Cable
C962
B01
B02
BNC
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