SONET Integration of TDM Signals
The SONET format allows different types of signal formats to be transmitted over the fiber-optic cable. It allows adding or dropping signals within a single multiplexer. Communication between various localized networks is complex due to differences in digital signal hierarchies, encoding techniques, and multiplexing strategies. For example, the DS1 signals with alternate mark inversion (AMI) encoding consist of 24 voice signals and 1 framing bit per frame, with a rate of 1.544 Mbps. It robs a bit from an 8-bit byte for signaling and therefore has a rate of 56 kbps per channel. However, with B8ZS encoding, every bit is used for transmission providing a data rate of 64 kbps per channel. The CEPT-1 (E1) signal consist ...
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