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Optical line terminal, optical network unit and passive optical network system
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一种光线路终端、光网络单元的技术，应用在通信领域
Active Publication Date: 2012-07-04
ZTE CORP
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[0004] In order to solve the above-mentioned technical problems, the present invention provides an optical line terminal, an optical network unit, a passive optical network system, an uplink bandwidth allocation method and a rate adaptation method, so as not to occupy existing wavelength resources and not degrade uplink In the case of optical link performance, the upstream direction supports the coexistence of multi-rate time division multiplexing of a single wavelength
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Embodiment 1
[0061] In this embodiment, the ONU can adjust the rate, and there is only one clock data recovery module at the OLT.
[0062] The topological structure of the PON system that supports uplink rates of 2.5Gbit / s and 5Gbit / s respectively is as follows: figure 2 As shown, the upstream wavelengths of the ONU with an upstream rate of 2.5Gbit / s and the ONU with an upstream rate of 5Gbit / s are both 1260-1280nm, and the two ONUs use time division multiplexing to send upstream data under the control of the OLT.
[0063] The ONU with an uplink rate of 2.5Gbit / s and the ONU with an uplink rate of 5Gbit / s are the same except for the rate of the optical sending device in the optical module part, and other components are the same, such as image 3 The shown ONU architecture diagram mainly includes medium access control (MAC) 31 and physical medium dependence (PMD) 32, wherein the transmission rate of the optical transmission device of the optical module of the ONU with an uplink rate of 2.5...
Embodiment 2
[0066] In this embodiment, the ONU can adjust the rate, and there is only one clock data recovery module at the OLT.
[0067] The topological structure of the PON system that supports uplink rates of 2.5Gbit / s and 5Gbit / s respectively is as follows: figure 2 As shown, the upstream wavelengths of the ONU with an upstream rate of 2.5Gbit / s and the ONU with an upstream rate of 5Gbit / s are both 1260-1280nm, and the two ONUs use time division multiplexing to send upstream data under the control of the OLT.
[0068] The ONU with an uplink rate of 2.5Gbit / s and the ONU with an uplink rate of 5Gbit / s are the same except for the rate of the optical sending device in the optical module part, and other components are the same, such as image 3 The shown ONU architecture diagram mainly includes medium access control (MAC) and physical medium dependence (PMD). Among them, the transmission rate of the optical transmission device of the optical module of the ONU with an uplink rate of 2.5Gb...
Embodiment 3
[0071] In this embodiment, the ONU can adjust the rate, and there are two clock data recovery modules at the OLT.
[0072] The topological structure of the PON system that supports uplink rates of 2.5Gbit / s and 5Gbit / s respectively is as follows: figure 2 As shown, the upstream wavelengths of the ONU with an upstream rate of 2.5Gbit / s and the ONU with an upstream rate of 5Gbit / s are both 1260-1280nm, and the two ONUs use time division multiplexing to send upstream data under the control of the OLT.
[0073] The ONU with an uplink rate of 2.5Gbit / s and the ONU with an uplink rate of 5Gbit / s are the same except for the rate of the optical sending device in the optical module part, and other components are the same, such as image 3 The shown ONU architecture diagram mainly includes medium access control (MAC) and physical medium dependence (PMD). Among them, the transmission rate of the optical transmission device of the optical module of the ONU with an uplink rate of 2.5Gbit / ...
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Abstract
The invention provides an optical line terminal (OLT), an optical network unit (ONU), a passive optical networksystem, an uplink bandwidth distribution method and a rate adaptation method. The OLT comprises an optical module, a clockdata recovery module, a media access control (MAC) chip and a control module, wherein the optical module is used for receiving uplink data sent by the ONU at different sending rates and sending the uplink data to the clockdata recovery module; the clockdata recovery module is used for receiving the uplink data, recovering a clock signal according to the uplink data and sending the uplink data and the corresponding clock signal to the MAC chip simultaneously; the MAC chip is used for storing the uplink data and the corresponding clock signal; and the control module is used for acquiring an uplink rate of the uplink data according to the clock signal corresponding to the uplink data and distributing an uplink bandwidth to the ONU according to the uplink rate. According to the invention, under the conditions that the conventional wavelength resource is not occupied and the performance of an optical uplink is not degraded, coexistence of a plurality of rate time division multiplexes is supported.
Description
technical field [0001] The invention relates to the field of communication technology, in particular to an optical line terminal, an optical network unit, a passive optical networksystem, an uplink bandwidth allocation method and a rate adaptation method. Background technique [0002] Gigabit-Capable Passive Optical Network (GPON) technology is a passive optical access technology using a point-to-multipoint topology. The topology of GPON system is as follows: figure 1 As shown, GPON is composed of an optical line terminal (OLT, Optical Line Terminal) on the office side, an optical network unit (ONU, Optical Network Unit) on the user side, and an optical distribution network (ODN, Optical Distribute Network). point network structure. ODN consists of passive optical components such as single-mode fiber, optical splitter, and optical connector. ODN provides an optical transmission medium for the physical connection between OLT and ONU. [0003] The downlink rate of GPON wid...
Claims
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