The present invention provides methods and systems for multiplexing five channels, such as 10 Gb/s to 50 Gb/s, into a single data sequence using a 5:1 multiplexer using a 1/5.sup.th ratio duty cycle clock. The 1/5.sup.th ratio duty cycle clock is a clock with a period equal to the channel data rate, and a pulse width equal to the period of data rate five times higher. The 1/5.sup.th ratio duty clock is combined with a proper combination of delays and phase shifters to allow the use of AND gates and OR gates to combine the five channels in a proper sequence to create a serial five-times higher data sequence.