. Responsible for providing technically complex support and assistance in the area of fiber optic networks, MW Radio and Synchronization Network which includes providing second level technical support for network problems and faults escalated to TTAC (Transport Technical Assistance Centre) related to SDH, DWDM, MW and Synch Source Equipment by vendors (Huawei, Huwaei, Nokia,Coriant. Home / Posts / MW, SDH, DWDM, SDH, PDH, DWDM, SONET / SDH Fundamental Interview Questions and Answers Part – I. Previous Next. SDH Fundamental Interview Questions and Answers Part – I. View Larger Image; SDH Fundamental Interview Questions and Answers Part – I. 4 (80%) 1 vote.
SDH, or Synchronous Digital Structure can be a regular for information transmission. DWDM, or Dense Wavelength Division Multiplexing, is definitely a brand-new technologies to carry data in fiber optic wires. DWDM does not replace SDH, but may create it unneeded.
History
The phone industry created a technologies called Time-Division Multiplexing, TDM, which allows multiple discussions to talk about one wire by giving each conversation its own short time time period to make use of the wire. SDH is usually a specialized standard that allows TDM to end up being used for information.
More Capacity
TDM has been made for wires, and there are limits to how quick the information flow can be sent. DWDM was created for optical wire, and sends multiple information streams concurrently by splitting the streams into different wavelengths of light. DWDM is at minimum 32 situations more effective than TDM. DWDM will be an improved edition of Wavelength Division Multiplexing, WDM, but the terms may become utilized interchangeably.
Other Advantages
SDH had been designed to become used with TDM technology. DWDM can also bring SDH data. This backwards compatibility decreases the costs of implementation for present systems. For long term networks, SDH may not always end up being used since DWDM can have a wider range of data types; in addition, other specifications may end up being more efficient for some networks.
Geography
SDH is utilized in most of the world, but the North American equal is definitely Synchronous Optical System, or SONET.
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