The SAP1626 Source Assignment Panel from Telex is viewed as a matrix switch capable of transforming two bus intercom systems into a 15 bus system. There are three kinds of buses in the SAP-1626. Not to mention, there are twelve primary intercom buses and three program or secondary intercom buses.
There are six additional outputs intended primarily for cameras, but can be used for additional TW intercom stations or groups of stations. Lastly, the SAP-1626 fits into a standard two unit high 19" (482.6mm) equipment rack. The front panel contains thumbwheels used to accomplish matrix switching.