Daisy Chaining in a TDM System

Daisy-chaining allows a signal to be delivered to multiple destinations without the need for routing or distribution equipment, or multiple transmitters as shown in Figure 1. An AV signal from a single transmitter, or from a single output on a matrix switcher, is sent to a receiver with daisy-chain capability. The receiver provides a loop-out signal that is sent to the next receiver in the daisy-chain. This configuration utilizes a single fiber from the transmitter or matrix output to the first receiver in the chain. A single fiber connects each consecutive receiver in the chain for efficient use of the fiber infrastructure. A daisy-chain configuration is ideal for digital signage applications.

Figure 1 Daisy-chain Configuration

In a TDM system, the second fiber used for bidirectional communications is often available as a loop out for creating a daisy-chain configuration as shown in Figure 2. Since there is a single bit stream, retransmission of the signal requires only a single E-to-O converter. Alternatively, a WDM system is transmitting multiple bit streams, requiring multiple optical converters and an additional WDM multiplexer/demultiplexer to implement a loop-through. Therefore, a WDM receiver typically has only a single fiber connection, and cannot be connected in a daisy-chain configuration.

Figure 2 TDM Receiver Configured for Daisy Chain

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