Step 3: Introduce A Cisco Hybrid Decoder - Cisco 4116 - EtherFast Switch Design Manual

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Figure 9 shows how a Cisco data converter connects to the ISP, the keyboard, and the matrix
switch. Note that the keyboard is no longer connected to the matrix switch.
Figure 9. RS-232–RS485 Data Converter

Step 3: Introduce a Cisco Hybrid Decoder

When a playback feature is requested, the hybrid decoder retrieves the video stream from the
proper ISP and delivers it to the proper matrix switch port. The background processing is
transparent to operators.
A shown in Figure 10, a hybrid decoder connects via a 10/100BASET Ethernet port to the IP
network and via a coaxial cable to the matrix switch. An input port from the matrix switch is
reserved to act as the input from the hybrid decoder. When an operator requests a playback
feature from the keyboard, the matrix switch is instructed to switch video from the reserved input
port to the current monitor port.
Figure 10. Cisco Hybrid Decoder
Design Guide
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