The source route index that is referring to the source route
currently used by the the channel. This is the value of the
index chmgrODescrChanSourceRouteIndex in
chmgrODescrChannelTable. A value of '0' would mean the 1st
configured source route is used, '1' the 2nd, and so on. If
no source route is used by the channel, then the value is
4294967295.