Curtiss-Wright FibreXtreme SL240, Hardware Reference Manual

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PRODUCT OVERVIEW
2.5 Topologies
2.5.1 Typical Topologies
There are four typical topologies for the SL240 card. These topologies should cover most
customer applications, though if another topology is desired contact Curtiss-Wright
Controls, Inc. Technical Support to see if it is possible. The topologies are:
•
Point-to-point
•
Chained
•
Single Master Loop
•
Multiple Master Loop
2.5.2 Point-to-point
The point-to-point topology is the native mode for the SL240 card. One user option
available in this mode is whether flow control is used or not. If flow control is used, the
transmitter on each end will not transmit when the remote receiver is telling it to back off
or the receive fiber is missing. In this mode, the maximum amount of data that can be
transferred is 247 MBps per direction (in this case, both cards are receiving and
transmitting 247 MBps at the same time). The maximum distance between the nodes is
26 km.
There are many applications for the point-to-point topology—as long as it involves only
two nodes, this topology covers it. One advantage that point-to-point has over the other
topologies is the ability to do simultaneous bi-directional traffic.
RX
TX
TX
RX
SL240
Card
SL240
Card
Figure 2-5 Point-to-Point Topology
Copyright 2006 2-8 FibreXtreme Hardware Reference Manual