A system and method for clock synchronization and clock switch over optical transmission network
An optical transport network and clock synchronization technology, applied in the field of optical network, can solve the problems of lack of local clock protection, OTN network node errors, etc., and achieve the effect of optimizing line service quality and saving costs
Inactive Publication Date: 2010-12-08
ZTE CORP
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[0005] Moreover, because the asynchronous mapping technology of OTN uses a lot of local clocks, there is usually only one local clock, which lacks protection for this local clock. Therefore, when the local clock is wrong or fails, all OTN network nodes will have errors.
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[0024] Preferred embodiments of the present invention are described in detail below.
[0025] The invention provides a system for completing clock synchronization and clock switching in an optical transmission network, and the system includes a plurality of OTN network elements. The clock export function and clock selection function are added in the hardware; an external clock, such as BITS equipment, is added, that is to say, it can be connected with the clock source of the digital synchronization network. Such as figure 1 As shown, the OTN network element includes a clock selection unit, a local clock unit, a control unit, at least one OTN port receiving unit, and at least one sending unit; the composition is described in detail below.
[0026] The clock selection unit is respectively connected to the local clock unit, the control unit, the OTN port receiving unit, and the sending unit. The clock selection unit is used to select the optimal clock source by comparing the qu...
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The invention discloses a system and a method for accomplishing the clock synchronization and the clock switching in an optical transport network. The OTN network element of the system comprises a clock selection unit, a local clock unit, a control unit, at least one receiving unit for OTN port and at least one transmission unit; wherein, the local clock unit is used for providing and sending thelocal clock information to the clock selection unit; the control unit is used for sending the control information to the clock selection unit and the transmission unit is used for increasing the clock information in the transmission service; the clock information comprises the clock source information and the clock quality grade information; the receiving unit for OTN port is used for receiving the services from the OTN port and extracting and sending the clock information to the clock selection unit; the clock selection unit is used for comparing various clock quality grades, determining theoptimal clock source as the clock source information and switching the clock of the OTN network element nondestructively according to all the clock information, thus unifying the line clock, optimizing the QoS of the line and providing the function of the clock protection.
Description
technical field [0001] The present invention relates to the field of optical networks, in particular, in a network composed of transmission equipment with a frame structure of ITU-T G.709 (optical transport network standard), each network node completes the clock selection mechanism and transmission mechanism A system and method for clock synchronization and clock switching of the entire network. Background technique [0002] With the development of optical communication technology, optical transport network (OTN, Optical Transport Network) is widely used in transmission equipment of 10G and above to meet the increasing needs of transmission rate and transmission distance. However, unlike SDH (Synchronous Digital Hierarchy, synchronous digital system), the OTN network does not have strict clock synchronization requirements, and can work in synchronous mapping and asynchronous mapping modes. Therefore, in point-to-point applications, this OTN application mode is flexible and...
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IPC IPC(8): H04L7/00H04J3/06
CPCH04J3/0688H04J3/0647
Inventor 涂勇
Owner ZTE CORP