ABB TB820-2V2 3BSE013209R1 system module
Technical data of product parameters
When you configure DiffServ you apply a priority value to a service and thus
identify it as different to less important services. You do this by arranging
routers or switches that can examine IP headers and prioritize them by the ToS TB820-2V2 3BSE013209R1
header octet. The network devices will then apply their rules to prioritize IP
traffic. The AADvance controller maintains the priority when it responds to
incoming messages, and sets a priority according to the configuration for the
messages it sends out.
If you use DiffServ, the controller scan rate can be up to 5 ms larger or smaller TB820-2V2 3BSE013209R1
than the scan rate when DiffServ feature is disabled.
The TCP/IP stack can apply the user-specified ToS data in its datagrams
during the TCP negotiation (this is the 3-way handshake, RFC 793). You can
specify this behavior when you set up DiffServ.When Ethernet forwarding is enabled, each 9110 processor module in the
controller forwards unicast messages intended for other devices, and all
broadcast and multicast messages, between its two Ethernet ports. A device
connected through the processor module can get its IP configuration through
BOOTP or DHCP, or statically.
The processor module in the first position (slot) in the 9100 processor base unit TB820-2V2 3BSE013209R1
forwards these messages from port E1-1 to E1-2, and in the opposite direction
from port E1-2 to E1-1. Similarly (if fitted), the processor module in the second
position in the 9100 processor base unit forwards traffic from port E2-1 to E2-
2, and from port E2-2 to E2-1. The third processor module (if fitted) forwards
traffic from port E3-1 to E3-2, and from port E3-2 to E3-1. In each case, the
second of these ports represents an uplink to the remainder of the network or
(if applicable) to a different network. A device connected to this port sees all
the traffic which can be of use to it: broadcasts, multicasts, and unicast traffic
not destined for the 9110.The processor module continues to consume the unicast messages intended
for itself, and all broadcast and multicast messages, as it does when Ethernet
Forwarding is disabled.
Ethernet forwarding is not designed to make links from one processor module
to a different processor module, for example from ports E1-2 to E2-1 and E2-2
to E3-1. Do not do this.
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