The Understanding PDHSONETSDH Networks course has been developed to quickly on-board those new to telecom transport. While PDH and SONET are the main focus of the course, SDH is also explored and compared, in cases where employees encounter the use of this standard in the field.
Plesiochronous Digital Hierarchy (PDH) circuits are
discussed first, both for their legacy and ongoing role
within the telecom network, and also for their basis as
SONET's VT1.5 and STS-1 frames. Fiber optic
networks are also discussed and compared to electrical signal transport, including the nature of synchronous and asynchronous circuits, and the need for a synchronous optical network. The SONET protocol is then looked at in more detail, including the use of overhead to provide alarm, pointer, DCC and other information as signals traverse different layers of the SONET model. Synchronous Digital Hierarchy (SDH) is then explained and compared to SONET, along with speed and frame differences.
Various test equipment is also demonstrated, such as PDH (DS1DS3) and SONET test sets, as well as optical inspection and OTDR instruments. Finally, Laser safety, fiber optic routing, cleaning and care are also emphasized.
Students Will Learn: