Simple, Low-Cost, 4-Port E1 Design Using DS21Q50

Abstract: Application note 376 provides the hardware and software requirements for using the DS21Q50 as a quad E1 transceiver. Two significant features are included for this type of application, Interleave Bus Operation (IBO) and a system clock synthesizer. IBO mode allows up to eight E1 data streams to be multiplexed into a single high-speed PCM bus. The system clock synthesizer can create a high-speed backplane clock based on the recovered clock form any of the E1 lines or an external reference clock.