P.3.273
Date Code 20151029 Protection Manual SEL-411L Relay
Protection Functions
87L Communication and Timing
87LMAC1, 87LMAC2, and 87LMAC3 specify the expected addresses of the
remote relay(s). If relays with these addresses do not exist on the network then
the 87L function is inhibited.
Shared Ethernet Network
It is recommended that when using Ethernet for 87L communications the
SEL ICON multiplexor be used to interconnect the relays making up the zone.
Each Ethernet port on the SEL ICON can be assigned to a unique Ethernet
network within a SONET system. This allows each 87L zone to be connected
to a dedicated LAN.
When using third party communications equipment it may be necessary for
the relay to share a network with other traffic. In this case the network must be
designed to ensure that 87L packets are not dropped and channel latency is
minimized. This may entail prohibiting certain types of Ethernet traffic such
as voice or video. Figure 3.187 shows an example of a shared Ethernet
connection.
Figure 3.187 Shared Ethernet Connection
Ethernet VLAN Settings
The relay supports VLAN Tagging according to IEEE 802.1q. VLAN tagging
allows a single physical network to be segregated into multiple independent
logical networks. Choose a unique VLAN tag for 87L traffic. Each of the
relays that make up the zone must have the same VLAN tag. It is preferable
that each 87L zone uses a separate VLAN tag.
The relay supports Ethernet priority according to IEEE 802.1p. This feature
ensures that high priority data will be transmitted ahead of lower priority data,
minimizing latency and reducing the possibility of a dropped packet. Within
Port 5A
Relay
SWITCH
MUX
Other
Ethernet
traffic
Table 3.144 Ethernet VLAN Settings
Setting Description Range Default
87LVLAN VLAN for 87L Ethernet 1–4094 101
87LPRI Ethernet priority for 87L 0–7 7
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