Sierra Video Ponderosa 3G Series Routing Switcher - Manual (Page 76)

SIERRA VIDEO
70
Analog Audio
Input Buffers
Each input buffer module has 32 identical circuits. Ponderosa Audio routers are designed
to work in broadcast and production facilities, and are compatible with balanced
interconnections.
The buffers have multiple purposes:
1. Present a high impedance to the incoming signal.
2. Remove unwanted common mode IE Hum signal.
3. Convert the signal to the level and impedance needed by the
switching matrix that follows.
The output of the input buffer circuits are connected to the switching matrix via the
internal motherboard. The 64x64 frame has positions for two 32-channel buffer modules;
and the 128x128 frame has positions for four 32-channel buffer modules.