PRODUCT OVERVIEW
4-9
FibreXtreme User GuideCopyright 2017
4.4.4 Single Master Ring
This is one of the most useful topologies for the SL240 PCIe card. This topology allows a single
transmitter to send data to a group of destinations with flow control from all of the destinations.
This flow control is a single flag to the master—it can send or it cannot send data. This means
that if one destination has a failure and stops removing data from its receive FIFO, it should be
switched out to avoid bringing down the loop. A switch suitable for this purpose is the
LinkXchange GLX4000 Physical Layer Switch, available from Curtiss-Wright Software controls
mastership switching of the ring. There are rules associated with master switching listed in the
“Programming Interface” section. The flow control used in this case is similar to a multi-drop
FPDP bus, where any receiver can back the transmitter off.
This is the typical configuration for record-playback systems, where you have multiple signal
processors and data storage elements present on the network and there is only one node (the data
source or the recorder playing the data back) transmitting at a time.
Figure 2-6 Single Master Ring
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