
210 Principles of Synchronous Digital Hierarchy
(iii) Minimum tributary data rate per second (for E3 bit stream)
= minimum number of data bits per frame × number of frames/s
= 1508 × 22,375
= 33,741,500 bits/s
Therefore, the minimum bit rate per second for each incoming E2
tributary
= 33,741,500/4
= 8,435,375 bits/s
= 8435.4 kbps (approximate)
= 8.435 Mbps (approximate)
(iv) Maximum tributary data rate per second (for E3 bit stream)
= maximum number of data bits per frame × number of frames per
second
= 1512 × 22,375
= 33,831,000 bits/s
Therefore the maximum bit rate for each E2 tributary
= 33,831,00 ...