Optical line terminal for managing link status of optical network units and gigabit ethernet passive optical network employing same
First Claim
1. An optical line terminal (OLT) for managing link status of optical network units (ONUs), comprising:
- an optical transmitter for transmitting to said ONUs information regarding data transmission periods allocated to said ONUs during a specified window period;
an optical receiver for receiving a report signal and data signal from each of said ONUs in each of said allocated data transmission periods, said report signal containing bandwidth allocation request information;
a link status discriminator for determining whether said report signal is received by said optical receiver, identifying a specific one of said ONUs having sent said report signal if said report signal is received, determining whether said data signal is sent from said identified ONU said data transmission periods allocated to said identified ONU, and determining a link status of said specific ONU in accordance with the combined received signal and data signal determination; and
a network management unit for performing an operation based on said determined link status of said specific ONU.
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Accused Products
Abstract
A system and method for managing link status in Gigabit Ethernet passive optical network (GE-PON) units (ONUs) is disclosed. The GE-PON comprises one or more ONUs allocated data transmission periods, respectively. Each of the ONUs sends a report signal and a data signal in a corresponding one of the allocated data transmission periods. The report signal contains a signal to request allocation of a bandwidth for data signal transmission in a next window period. The GE-PON further comprises an optical splitter having its one side connected with the ONUs and its other side connected with at least one optical communication channel. The optical splitter switches an input signal to a desired destination. The GE-PON further comprises an optical line terminal (OLT) for determining whether the report signal is received, identifying a specific one of the ONUs having sent the report signal when the report signal is received, determining whether the data signal is received from the specific ONU in a specific one of the data transmission periods allocated to the specific ONU, and discriminating and managing a link status of the specific ONU in accordance with the determination made.
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Citations
18 Claims
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1. An optical line terminal (OLT) for managing link status of optical network units (ONUs), comprising:
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an optical transmitter for transmitting to said ONUs information regarding data transmission periods allocated to said ONUs during a specified window period;
an optical receiver for receiving a report signal and data signal from each of said ONUs in each of said allocated data transmission periods, said report signal containing bandwidth allocation request information;
a link status discriminator for determining whether said report signal is received by said optical receiver, identifying a specific one of said ONUs having sent said report signal if said report signal is received, determining whether said data signal is sent from said identified ONU said data transmission periods allocated to said identified ONU, and determining a link status of said specific ONU in accordance with the combined received signal and data signal determination; and
a network management unit for performing an operation based on said determined link status of said specific ONU. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A Gigabit Ethernet passive optical network (GE-PON) comprising:
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one or more ONUs, each having allocated a data transmission period within a window period, each of said ONUs operable to send at least a report signal and a data signal said report signal containing a signal to request allocation of a bandwidth for data signal transmission in a next window period;
an optical splitter having its one side connected with said ONUs and its other side connected with at least one optical communication channel, said optical splitter switching an input signal to a desired destination; and
an OLT for determining whether said report signal is received, identifying a specific one of said ONUs having sent said report signal if said report signal is received, determining whether said data signal is received from said identified ONU in an allocated data transmission period, and determining and managing a link status of said identified ONU in accordance with the received signal and data signal determination. - View Dependent Claims (8, 9, 10)
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11. A method for determining network link status comprising the step of:
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determining whether a report signal is received during a specified period, said report signal being transmitted by one of a plurality of network devices allocated the specified period;
determining whether a data signal is received during said specified period; and
determining a link status of the network device in accordance with the combined determination of said received signal and said data signal, wherein the link status is determined to be normal when said report signal and said data signal are received as expected. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification