TLX Matrix Switch ASCII API V5 19 Rev. I, January 2019
The TLX1280
Port numbering begins at the bottom of the TLX1280’s chassis and starts with Card 1, the leftmost I/O card of
the Lower Card Cage. Card 2 is directly above Card 1 in the Upper Card Cage. When installing fewer than 40
I/O Cards, cards slots may be chosen at the user’s discretion. Each card slot has a port number designation
printed above the card for easy reference.