TLX Matrix Switch ASCII API V5 18 Rev. I, January 2019
The TLX640
TLX640 Port numbers begin at the Lower Card Cage and start with the left I/O Card (Ports 1-
20), proceeding up to the Upper Card Cage’s left I/O Card (Ports 21-40).
Port numbers then move to the second I/O Card on the Lower Card Cage (Ports 41-60) and proceed
up to the second I/O Card on the Upper Card Cage (61-80), etc.