Even though a routing matrix can comprise five separate physical components (a TX Matrix platform and up to four T640 routing nodes), it is best if you consider a routing matrix as a single routing platform. When you issue configuration and operational commands on the TX Matrix platform, your view of the routing matrix shows a single routing device with a high number of FPCs and PICs. For a detailed discussion of FPC numbering in a routing matrix, see Adjusting the Configuration to Accommodate Increased FPC Numbers.