Industrielt ethernet

Question 1

Industrial Ethernet

Answer 1

Rugged/Industrial-grade components
harsh environments
extreme vibration and shock 
high immunity to interference
Convection cooling
(DIN mountable)

Question 2

Scheduling (QoS)

Answer 2

With strict scheduling, all data in the highest priority queue will be sent before any lower priority data, then all data from the second highest priority, and so on. This assures that high-priority data always gets through as quickly as possible.

With fair scheduling, a round-robin algorithm is used, weighted so that more high-priority than lowpriority data gets through Specifically, the switch will send eight frames from the urgent queue, then four from the expedited queue, two from the normal queue, and one from the background queue, then start over with the urgent queue. This assures that the lower priority queues will not be starved.

Question 3

Traffic Priority

Answer 3

• IP header
  
  • Using the Priority field in the IP-Header (also called Type of Service (ToS) field)
  • Default 0 (and can be sett up to 255)
• IEEE 802.1p user priorities
• Added tag with priority field from 0-7
• Each level has a traffic type associated with it (5: Video data)

Question 4

QoS “example”

Answer 4

Application:

• FTP (TCP transport)
• HTTP (TCP transport)
• SMTP (TCP transport)
• CIP (TCP & UDP)
• SNMP (UDP transport)
• BOOTP DHCP (UDP transport)

Network
IP (TCP & UDP)
OSPF
ARP
ICMP
IMGP
RARP

Data Link Physical:
IEEE 802.3 Ethernet