Qos (Quality Of Service) - Siemens SWT 3000 Equipment Manual

Functional Description
2.12 Tele Protection Over Packet TPoP
Parameter
Throughput statistics
Tx kbytes
Tx packets
Rx kbytes
Rx packets
Packet corrupted
Packet reordered
Packet dropped
Packet loss
Packet loss rate
Packet delay
Read
Clear
2.12.7

QoS (Quality of Service)

Quality of Service (QoS) defines several features for different services to enable fast and preferred transmis-
sion of high-priority traffic rather than low-priority traffic. For SWT 3000, protection command is a time critical
message that must be transmitted with highest priority to ensure the minimum transmission delay.
There are 2 different types of Quality of Service:
•
The QoS used for teleprotection signaling
•
The QoS used for remote monitoring and web-based configuration.
DSCP, ToS and VLAN-Priorities can be assigned to the 2 classes of QoS.
The Differentiated Services Code Point (DSCP) or Type of Service (ToS) in the IP header field is used for IP layer
3 classification purposes. The network node can select the appropriate path to forward IP packets according to
the value of DSCP or ToS.
IEEE 802.1Q is the networking standard supporting Virtual LAN and CoS Priorities in Ethernet networks. The
standard defines a system of VLAN and Priority tagging of Ethernet frames. The bridges and switches handle
such frames according to the priority value in VLAN tag and the quality of service prioritization schema.
All ingress IP packets are assigned with the predefined DSCP/ToS and IEEE 802.1Q settings, if the QoS option is
enabled. The network switch evaluates the priority field of incoming telegrams and depends on the priority
recognized, and furthermore pushes the data into a high-priority processing path or into a normal priority
path.
HTTP uses the same VLAN of RM service. If VLAN is enabled, the EN100 module homepage can be accessed via
Ethernet switch as shown in
SWT 3000 is enabled with IEEE 802.1Q VLAN tag support (trunk port). So the ingress HTTP untagged frame
from the switch (access port) is tagged by switching to the same VLAN ID of RM.
86
Comments
Minimum / maximum receiving kbps since last clear.
Transmission kbytes per second and cumulative transmission kbytes.
Transmission packet number per second and cumulative transmission
packet number.
Receiving kbytes per second and cumulative receiving kbytes.
Receiving packet number per second and cumulative receiving packet
number.
Corrupted packet number per second and cumulative value.
Reordered packet number per second and cumulative value.
Dropped packet number per second and cumulative value.
Lost packet number per second and cumulative value.
Packet loss rate per second.
Command transmission delay in ms.
Read Ethernet statistic data
Clear all Ethernet statistic data
Figure 2-29. The user PC is connected to the switch and the port connected to
Smart Communication, SWT 3000 Teleprotection, Equipment Manual
C53000-G6040-C605-1, Edition 03.2020