
Operating Manual
MAN_EL-1000-4GM
Version:
2.6.1
/ 01.02.2021
Authorized by:
T.W.
Page 59 of 77
5.9.3
Quality of Service (QoS)
Quality of Service (Figure 21) influences the data traffic in the switch so that services are available to
the receiver with a specified quality. In addition to this, data packets are sorted depending on
different priority processes (port-based, class of service, type of service) into four priority queues,
which are emptied at the exit corresponding with a priority mode (strictly and weighted).
Figure 21: Quality of Service
Priority process
The following priority processes can be selected:
Port-based only: The priority takes place exclusively based on the port priority.
Class of Service (CoS) only: The priority takes place based on the CoS fields in the VLAN tag of
the data packets. Non VLAN packets are guided to the priority queue with the lowest priority.
Type of Service (ToS) only: The priority takes place based on the ToS fields in the IP header of
the IP data packets. Packets without ToS field or non-IP packets are guided into the priority
queue with the lowest priority.