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15.17
Date Code 20171006
Instruction Manual
SEL-400 Series Relays
Communications Interfaces
Ethernet Communications
operate on port 320. Except for peer delay messages, the relay sets the time
allowed to live (TTL) value in the UDP/IP header of PTP messages to 64. This
allows the possibility of synchronizing relay time through routers across a WAN
to a PTP master. High-accuracy synchronization may not be achievable across
the WAN, so it is left to the user to determine if the accuracy meets the needs of
their application.
When using the Power System profile, use the VLAN number and priority set-
tings PVLAN and PVLANPR to set the VLAN ID and priority, respectively, of
the Ethernet frames. Be sure to set PVLAN unique from other VLANs used
within the relay.
PTP defines two methods for calculating and correcting for the communications
path delay between the relay and the master clock: end-to-end (Delay Request-
Response) and peer-to-peer (Peer Delay Request-Response). The end-to-end
mechanism calculates the total path delay between the relay and the master clock.
The peer-to-peer mechanism calculates the total path delay in a piecemeal fash-
ion between each device in the path. Peer-to-peer is the more accurate method
and is recommended for use in SEL relays. The relay periodically initiates path
delay calculations. Use the PTHDLY and PDINT settings to configure the path
delay method and the path delay request rate. If PTHDLY is set to OFF, then the
relay will not calculate and correct for path delay. Only the peer-to-peer mecha-
nism is available for Power System profile.
By default, the relay will synchronize to any clock on the network that it evalu-
ates to be the best clock based on the Best Master Clock Algorithm. Use the
Acceptable Master Table settings to specify a list of master (grandmaster or
boundary) clocks to which the relay may synchronize. The relay will not syn-
chronize to any master clock that is not in the list. It is recommended to use this
feature for additional security. The AMNUM setting selects the number of master
clocks you will list in this table. The default value is OFF, which means the relay
will synchronize to any master clock on the network. If AMNUM is set to a value
other than OFF, that number of allowable masters must be identified in accor-
dance with the PTP transport chosen, i.e., MAC address for 802.3 or IP address
for UDP transport.
If the PTP transport (PTPTR) is set to UDP, use the AMIP
n
settings to specify the
IP addresses of the clocks the relay is permitted to synchronize to. If PTP trans-
port is set to layer 2, use the AMMAC
n
settings to specify the MAC addresses of
the clocks the relay is permitted to synchronize to.
NOTE:
The Acceptable Master Table
feature may not work for transport
over layer 2 if the intervening
Ethernet switch(es) modify the source
MAC address of Announce messages
passing through them. With transport
over layer 2, the relay uses the source
MAC address to identify if an
Announce message is coming from a
master clock in the table.
If the ALTPRI
n
(alternate priority1 for master n) setting is set to a positive value,
the priority1 value in received Announce messages from the corresponding mas-
ter clock will be replaced by the ALTPRI
n
value before applying the Best Master
Clock Algorithm. The ALTPRI
n
values reprioritize the master clocks locally. A
discussion of reasons to apply alternate priorities is beyond the scope of this man-
ual. If you are not familiar with the Best Master Clock Algorithm, leave the set-
ting set to 0.
HTTP (Hypertext Transfer Protocol) Server
The relay provides an HTTP (Web) server to provide read-only access to selected
settings, metering, and reports. The HTTP server is disabled by default. To
enable the HTTP server, make the following settings using the
SET P 5
command.
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