HP Coarse Wave Division Multiplexer - Manual (Page 15)

In Figure 7 , Figure 8 and Figure 9 , the HP CWDM MUX modules on the left are termed the West path
and the modules on the right are termed the East path. This allows a point-to-point connection, so that the
network will remain viable even if the fiber is broken at one point.
Figure 7 Point-to-point: 8-port (redundant, no single point of failure)
Figure 8 Point-to-point: 4-port (redundant, no single point of failure)
CWDM MUX user guide 15