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WAGO-ETHERNET-Zubehör 852
Enhanced Features
43
852-1305 8/4-Port 100BASE-T/1000BASE-SX/LX
Manual
1.1.0
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7
Enhanced Features
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7.1
Default Settings
7.1.1
Jumbo Frame
“Jumbo Frames” are ETHERNET frames with a size of more than 1500 bytes.
Jumbo frames can increase data transmission efficiency in a network. The bigger
the “Jumbo Frame”, the better the network performance.
“Jumbo Frame” settings
The “Jumbo Frame” settings apply to all ports.
If the size of a packet exceeds the size of the “Jumbo Frame”, the packet is
dropped.
7.1.2
SNTP
SNTP (“
S
imple
N
etwork
T
ime
P
rotocol”) is a protocol for synchronizing clocks
in computer systems. It is a less complex implementation of an NTP (“
N
etwork
T
ime
P
rotocol”).
SNTP uses “
C
oordinated
U
niversal
T
ime” (French: “
T
emps
U
niversel
C
oordonné”). No information on time zones or daylight savings time is
transmitted. This information falls outside the protocol range and must be
obtained separately.
The SNTP port is 123.
1.
The SNTP server always replies the current UTC time.
2.
If the switch receives the SNTP reply time, it adjusts the time to the time
zone configuration and configures the time for the switch accordingly.
3.
If the time server's IP address is not configured, the switch does not send
an SNTP request packet.
4.
If the switch does not receive an SNTP reply packet, it repeats the
challenge indefinitely every ten seconds.
5.
If the switch receives an SNTP reply, it repeats the time request from the
NTP server every hour.
6.
If the time zone and NTP server changes, the switch repeats the request
process.
7.
No default SNTP server.