Introduction to the communication network fully in this course, encountered the term many operators network, to sum up:
Optical synchronous SDH transmission network : the "boss" of communication. Circuit to the TDM (Time Division Multiplexing) basis, scheduling follow the traditional circuits, there is a wealth of control mechanisms. Commonly used circuits between ministries and agencies and cities.
MSTP (Multi-service Transport Platform) i.e. multi-service Transport Platform ): Ethernet and SDH products cooperation. Using the control mechanism of SDH. Uneven distribution of shares in the joint venture: SDH lift station shares 70%, 20% shares representing Ethernet, ATM other comprising 10% of total shares. It can be seen from this power or SDH, core or TDM.
WDM Wavelength Division Multiplexing (capacity) of the vehicle corresponds to a plurality of lanes (channels) of the (signal) is transmitted into the same path (fiber) in. Used to expand the bandwidth up to 4T flow / s.
Lane spacing of 20nm, the sparse wavelength division, also known as coarse wavelength division; lane spacing of 0.8nm or less, for the dense wavelength division;
WDM only use (Metro WDM) in the city's main thoroughfares, but are also used across the city on inter-provincial road (long-haul WDM).
Disadvantages:
1, poor traffic management message passing (OAM lack of)
2, inflexible scheduling
3, easily blocked (the protection is imperfect)
OTN optical transport network = WDM + SDH: in WDM based on the integration of some bit of SDH, such as rich OAM overhead, flexible service dispatch, perfect protection methods. Scheduling operations into OTN: Optical Layer Scheduling and electrical layer. Scheduling the light absorbing layer can be understood as a category WDM; electrical layer to be understood that the scope of the SDH.
IP-RAN Ethernet / IP implementation camp standards. Let SDH (TDM services) on the train
PTN : SDH business for many years, there are a lot of customers (there TDM business needs) camouflage face-lift to our gang activity, remove perjury restore the original appearance and then the gangs
