15.13
Date Code 20171006 Instruction Manual SEL-400 Series Relays
Communications Interfaces
Ethernet Communications
File Structure
The basic file structure is organized as a directory and subdirectory tree similar to
that used by Unix, DOS, Windows, and other common operating systems. See
Virtual File Interface on page 15.18 for information on the basic file structure.
Access Control
The standard FTP logins consist of the three-character access level command
(e.g., ACC, BAC) with their respective passwords. For example, with default
passwords, if you use the user name of 2AC and password of TAIL, you will con-
nect with Access Level 2 privileges.
FTP settings control anonymous file access features. The special FTP user name
“anonymous” does not require a password. It has the access rights of the access
level selected by the FTPAUSR setting. For example, if FTPAUSR is set to 1 (for
Access Level 1), the FTP anonymous user has Access Level 1 rights.
SEL advises against enabling anonymous FTP logins (FTPANMS = Y) except
under test conditions. The Ethernet card does not require a password for the spe-
cial FTP user name “anonymous”. If you enable anonymous FTP logins, you are
allowing unrestricted access to the relay and host files.
Telnet
Telnet is part of the TCP/IP protocol suite. A Telnet connection provides access
to the relay user interface. When you connect with Telnet and log into the relay,
you can use all of the ASCII and Compressed ASCII commands described in
Section 14: ASCII Command Reference to configure and interact with the relay.
You can also use the SEL binary Fast Meter and Fast Operate commands
described in SEL Fast Meter, Fast Operate, Fast SER Messages, and Fast Mes-
sage Data Access on page 15.28.
Use a Telnet client or QuickSet on the host PC to communicate with the relay. To
terminate a Telnet session, use the EXI command from any access level.
Telnet settings available when ETELNET := Y are listed in Table 15.8.
Simple Network Time Protocol (SNTP)
When SNTP is enabled (Port 5 setting ESNTP is not OFF), the relay internal
clock conditionally synchronizes to the time of day served by a Network Time
Protocol (NTP) server. The relay uses a simplified version of NTP called the
Simple Network Time Protocol (SNTP). SNTP is not as accurate as IRIG-B or
PTP. The relay can use SNTP as a less accurate primary time source, or as a
backup to the higher accuracy IRIG-B or PTP time sources.
If an IRIG-B time source is connected and either Relay Word bits TSOK or
TIRIG assert, then the relay synchronizes the internal time-of-day clock to the
incoming IRIG-B time code signal, even if SNTP is configured in the relay and
Table 15.8 Telnet Settings
Label Description Range Default
TCBAN Telnet connect banner 254 characters TERMINAL SERVER:
TPORT Telnet TCP/IP port 23, 1025–65534 23
TIDLE Telnet Port connection time-out 1–30 minutes 15
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