Schweitzer Engineering Laboratories SEL-421-4 - Page 1278

15.8
SEL-400 Series Relays Instruction Manual Date Code 20171006
Communications Interfaces
Ethernet Communications
The relay uses the DEFRTR address setting to determine how to communicate
with nodes on other local networks. The relay communicates with the default
router to send data to nodes on other local networks. The default router must be
on the same local network as the relay or the relay will reject the DEFRTR set-
ting. You must also coordinate the default router with your general network
implementation and administration plan. See Table 15.6 for examples of how
IPADDR and SUBNETM define the network and node and how these settings
affect the DEFRTR setting.
If there is no router on the network, enter a null string (“”).
Table 15.5 CIDR Notation
CIDR Value Subnet Mask
/32 255.255.255.255
/31 255.255.255.254
/30 255.255.255.252
/29 255.255.255.248
/28 255.255.255.240
/27 255.255.255.224
/26 255.255.255.192
/25 255.255.255.128
/24 255.255.255.000
/23 255.255.254.000
/22 255.255.252.000
/21 255.255.248.000
/20 255.255.240.000
/19 255.255.224.000
/18 255.255.192.000
/17 255.255.128.000
/16 255.255.000.000
/15 255.254.000.000
/14 255.252.000.000
/13 255.248.000.000
/12 255.240.000.000
/11 255.224.000.000
/10 255.192.000.000
/9 255.128.000.000
/8 255.000.000.000
/7 254.000.000.000
/6 252.000.000.000
/5 248.000.000.000
/4 240.000.000.000
/3 224.000.000.000
/2 192.000.000.000
/1 128.000.000.000
/0 000.000.000.000