Sierra Video Ponderosa 3G Series Routing Switcher - Manual (Page 66)

SIERRA VIDEO
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Rear Panel Connections
The Ponderosa Audio frame(s) are used in other Sierra Video audio applications and models.
Therefore there are several unused connectors on the rear of the unit.
Unused connectors;
 Control Panels.
 9 pin Serial Ports (port 1 and port 2).
 REF
Input.
Only the J1 and multi-drop connectors are used in the Ponderosa Audio models.
The multi-drop connectors do not exist on the digital audio (E) models.
A system drawing will be sent with your order indicating the proper connections.