Transmission techniques in MINI-LINK TN (SDH - PDH - Ethernet )

  In this section we will look to explain the different transmission techniques used in Mini-link

TN

the different transmission techniques used in Mini-link TN are:

PDH

SDH

Ethernet

In PDH, digital multiplexer's inputs(bit streams) are of same bit rate and are derived from different clocks from different oscillators. Each will differ within tolerance of few clock periods. Hence it is called plesiochronous.

Bit Interleaving is used in PDH to combine digital signals.

SDH supports various topologies such as point to point, ring, star, linear bus etc. It uses TDM and octet multiplexing. It uses extremely precise timings. It employs both electrical and optical specifications.

In SDH, digital multiplexer's inputs are of same bit rate and are derived from common clock, hence are in phase. Hence it is synchronous.

Word(group of bits) Interleaving is used in SDH to combine digital signals.

 The following power point will illustrate the different between all types of  the previous
transmission techniques

http://www.mediafire.com/file/v4omx04uyxllkjl/03813_01_TN_transm_overview.ppt

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