A synchronous nonstatistical TDM is to be used to combine four 4.8-kbps and one 9.6-

kbps signals for transmission over a single leased line. For framing, a block of 7 bits (

pattern 1011101) is inserted for each 48 data bits. The reframing algorithm (at the receiving demultiplex)

is as follows:

1. Arbitrarily select a bit position.

2. Consider the block of 7 contiguous bits starting with that position.

3. Observe that block of 7 bits each frame for 12 consecutive frames.

4. If 10 of the 12 blocks match the framing pattern the system is “in-frame”; if not advance one bit position and return to step 2.

a. Draw the multiplexed bit stream (note that the