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US 9,178,646 B2Granted
Exchange device
AssigneeOki Electric Industry Co., Ltd.
InventorMasahiro Sarashina
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AssigneeOki Electric Industry Co., Ltd.
InventorMasahiro Sarashina
Estimating the term…
The exchange device groups PON branches into PON branch groups based on the amount of communication data traffic that has arrived via a communication network with a plurality of optical network units (ONUs) respectively belonging to one of a plurality of PON branches as a transmission destination, multiplexes the communication data for each PON group, and transmits the multiplexed data. The exchange device has an unit configured to transmit each piece of communication data from the ONUs to one output port selected from among a plurality of output ports based on the transmission wavelength of the communication data. The exchange device groups a plurality of PON branches into PON branch groups based on the required bandwidth of each of the ONUs, and designates the transmission wavelength for each of the ONUs so that each piece of the communication data from one PON branch group is transmitted to one port.
An exchange device comprising:
An exchange device comprising:
An exchange device comprising:
An exchange device comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Wavelength allocation for communications one-to-many, e.g. multicasting wavelengths: in WDM-PON sharing multiple downstream wavelengths for groups…
Using measurements of the data signal: network aspects, e.g. central monitoring of transmission parameters
Using measurements of the data signal: performance monitoring; Measurement of transmission parameters
For downstream transmission, e.g. optical line terminal [OLT] to ONU: using one wavelength per ONU
About 7 years 3 months of term left · ends 15 Jan 2034 (estimated)
This application is based upon and claims benefit of priority from Japanese Patent Application No. 2012-046561, filed on Mar. 2, 2012, the entire contents of which are incorporated herein by reference.
The present disclosure relates to an exchange device controlling one or more optical network units (ONU) for a wavelength division multiplexing (WDM)/time division multiplexing (TDM)-passive optical network (PON).
Generally, in a WDM/TDM-PON, PON branches from a plurality of communication areas are taken as one PON branch based on WDM technology to improve the efficiency of bandwidth allocation for the entire communication area. For example, if an ONU requiring a large bandwidth is present, that ONU is allocated a large bandwidth by dedicating one wavelength to the PON branch that the ONU belongs to. This allocation is carried out by controlling the PON branch in one of the transmission devices that is included in an exchange device. Conversely, if a plurality of PON branches that do not require a large bandwidth are present, the plurality of PON branches are controlled together in one of the transmission devices included in the exchange device. Thus, by collectively controlling PON branches that have a small required bandwidth, the total number of operations in a transmission device is decreased, which allows power consumption to be reduced (e.g., JP 2011-82908A (US2011/085795) and JP 2011-135280A).
FIG. 1 is a block diagram illustrating a configuration of an exchange device according to the present disclosure with ONUs;
FIG. 2 is a block diagram illustrating a configuration of a management unit according to a first embodiment;
FIG. 3 is an example of a bandwidth threshold table stored by a threshold update unit;
Embodiments of the present disclosure will now be described in more detail with reference to the attached drawings.
<First Embodiment>
FIG. 1 illustrates a configuration of an exchange device 10, which is an embodiment of the present disclosure. The exchange device 10 houses ONU groups 40-1 to 40-M (wherein M is an integer of 2 or more), which are optical network units on a subscriber side, via optical transmission paths 30-1 to 30-M, such as an optical fiber, that act as an optical line terminal (OLT) on a telecommunications carrier side in a PON system that uses wavelength division multiplexing (WDM) technology in combination with time division multiplexing (TDM) technology. The ONU groups 40-1 to 40-M are respectively associated with PON branches B-1 to B-M. The communication direction from a communication network 20, which is a higher-level network, to the ONU groups 40-1 to 40-M will be referred to “downlink”, and the opposite direction as “uplink”.