Read the first sentence. Then skitter the paragraph. Any pattern. Can be.

The digital backbone of the PSTN uses time-division multiplexing, or the variation described below, to move bits throughout the network.
capacity of 1.54 Mbps
difference between the two
rate
pulsed
capacity ... increase... speeded up
amazing
generate... track pulses.... rat 10 gbps

smallest T1,
largest OC-192

No set rules how you see or put the puzzle of the paragraph together.

You can go over it forward, backward. zigzag
curved, circular anyway you want.

Alex