PDH stands for a plesiochronous digital hierarchy, This technology is very popular technology applied in the network telecommunication system in order to transport large amounts of data over a digital transport equipment like fiber-optic or microwave radio system. Here this article gives the advantages and disadvantages of the PDH system to better understand this topic.
Benefits or advantages of PDH:
- In this technology, network management has been enhanced to a greater extent.
- In this equipment is small enough for use in street cabinets.
- If perform well in North America, Europe and japan independently as per standard specification.
- Cost-effective support for access networks.
- Good for point to point connections.
- It was designed to support the transportation of huge amounts of data over digital equipment like various transmission mediums such as microwave radio systems or fiber optic systems.
Drawback or disadvantages of PDH:
- Tolerance is allowed in bit rates.
- PDH allows only point to point configuration.
- The maximum capacity for PDH is 566 Mbps, which Bandwidth is limited.
- In PDH, the different frame is used for transmission and in the data layer. Hence multiplexing and de-multiplexing are very complex.
- PDH does not support the hub.
- No provision for NMS.
- Every manufacture has its own standard, PDH also has different multiplexing hierarchies making it difficult to integrate interconnecting networks together.
- It does not support the hub.
- PDH is no longer efficient to meet the demand placed on it.
- In this system, the accessing lower tributary requires the whole system to be de-multiplexed.