MAPPING OF PLESIOCHRONOUS DIGITAL HIERARCHY SIGNALS INTO SYNCHRONOUS TRANSPORT MODULE FRAME FOR SYNCHRONOUS DIGITAL HIERARCHY SYSTEM

• Tooki, O. O.,

  Air Force Institute of Technology (AFIT), Kaduna

• Abolade, R. O

  Ladoke Akintola University of Technology, Ogbomoso

• Aborisade, D. O.

  Ladoke Akintola University of Technology, Ogbomoso

Optical Communication System (OCS) is a technology that employs optical fibers for information transmission. Internet service providers use different OCS technologies to support different types of traffic and service requirements. Some of the technologies include Plesiochronous Digital Hierarchy (PDH), Synchronous Digital Hierarchy (SDH), Dense Wavelength Division Multiplexing (DWDM) and Ethernet. SDH technology defines a synchronous frame structure for transmitting Time Division Multiplexing digital signals. The first building block of the SDH has a bit rate of 155.52 Mb/s and is referred to as Synchronous Transport Module one (STM-1). Information being transmitted is organized into frames. These frames are continuously transmitted one after the other. Each frame consists of a collection of overhead fields and a payload. Mapping, the algorithms used in internet service provisioning, automatically compute the signal path to satisfy a given service request. This paper overviewed the mapping of PDH signals to the synchronous transmission standard of STM. Three methods of mapping; 140, 34 and 2 Mb/s PDH signals, to the STM-1 frame were presented. Also discussed is the knowledge on how SDH equipment constructs STM frames in the electrical domain before it is optically transmitted.

1. Tooki, O. O., , Air Force Institute of Technology (AFIT), Kaduna

   Electrical and Electronics Engineering Department

2. Abolade, R. O, Ladoke Akintola University of Technology, Ogbomoso

   Electronic and Electrical Engineering Department

3. Aborisade, D. O., Ladoke Akintola University of Technology, Ogbomoso

   Electronic and Electrical Engineering Department

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