402 / 413
9/14
Topologies
(
continued)
Technical information
Ethernet network
Infrastructure
Different network topologies
(
continued)
Daisy chain topology
(
continued)
Limitations of daisy chain:
Limitations of daisy chain to insure the operational integrity of the network and meet
performance metrics, are:
b
Dual port Ethernet devices only support 10 Mbit/s and/or 100 Mbit/s operational
speeds and must use one or the other.
b
The network will operate only as fast as the slowest device that is connected to the
network
b
In order to improve network traffic latency the numbers of devices in a single scan
chain, has been limited to 32 devices. Limiting a single scan chain to 32 devices the
time for a round trip of a packet through the daisy Chain is expected less than 5
milliseconds.
The maximum packet latency of a packet passing through any device in a scan chain
is no more than 10 μs.
Ring topology
In a ring topology, all devices or network infrastructure components are connected in
a loop. Through this type of topology, a type of network redundancy is achieved.
Ethernet Ring
Ethernet rings are usually the backbones of applications in which high availability is
required. If ring topology is required then switches that support this feature should be
ordered.
Deploying Ring topologies using ConneXium.
The ConneXium line offers hubs and switches that allow the deployment of single
and coupled self-healing rings. There is additional information about this topic
page 9/17.
DTE
DTE
DTE
DTE
DTE DTE
2
1
3
4
5
6
7
8
9
10