摘要:
Techniques are described for identifying a rogue network interface device whose laser is not under control of a controller of the network interface device. The techniques identify the rogue network interface device based on reception of a predefined data pattern in a timeslot that is not reserved for any of the network interface devices without needing to disable upstream data transmission from the network interface devices during their assigned timeslots. The techniques also relate to a network interface device determining whether the network interface device is transmitting optical signals at a wavelength different than the wavelength that the OLT to which the network interface device is associated receives.
摘要:
The present invention relates to a receiving apparatus 20 that receives burst signals, each including a synchronization section and a data section following the synchronization section, from a plurality of sources in a time division manner. The receiving apparatus 20 includes amplifying units 102 and 113 that amplify each burst signal; a detecting unit 116 that detects arrival of the burst signal from an output signal from the amplifying units 102 and 113; a comparing unit 104 that compares the output signal from the amplifying units 102 and 113 with a predetermined threshold value and outputs a binary signal; and a control unit 108 that sets the timings of changing a receive function during the synchronization section by adding delay times Dai and Dbi to a detection time point where the detecting unit 116 performs an output. The control unit 108 is configured to be able to change the delay times Dai and Dbi in a plurality of ways.
摘要:
The present invention is directed to data communication system and methods. More specifically, various embodiments of the present invention provide a communication interface that is configured to transfer data at high bandwidth using PAM format(s) over optical communication networks. In various embodiments, amplitude and phase of the optical wave are modulated. There are other embodiments as well.
摘要:
A single line converter module comprises a housing; an environmentally hardened fiber optic connector located in the housing and configured to be optically coupled to a service terminal for receiving downstream optical frames; a single electrical connector located in the housing and coupled over a metallic medium to a network terminal providing a service to respective customer premise equipment (CPE); and an optical-to-electrical (O/E) converter located in the housing and configured to convert the downstream optical frames to an electrical signal for transmission over the metallic medium to the network terminal.
摘要:
A method, device and system for implementing a long reach passive optical network are provided. Uplink optical burst packets are transmitted by an optical network unit. The uplink optical burst packets are converted into an electrical signal and then a continuous optical signal. The continuous optical signal is transmitted to a receiving device.
摘要:
An apparatus comprising a first passive optical network (PON) component configured to couple to a second PON component via an optical link and authenticate the second PON component based on authentication information to authorize a backup wireless link between the first PON component and the second PON component. The backup wireless link corresponds to a wireless backup system for the PON. The authentication information is associated with an identifier of the wireless backup system. Also included is a network component comprising a first passive optical network (PON) component configured to receive authentication information for a wireless backup system for a PON from a second PON component and compare the authentication information to expected authentication information at the first PON component to authorize a wireless link between the first PON component and the second PON component for the wireless backup system.
摘要:
A first phase setting circuit generates a first phase setting signal. A first synchronous signal generator generates a first synchronous clock signal having a phase set by the first phase setting signal from a multi-phase local clock signal. By removing a phase fluctuation component representing phase fluctuation of the reception data signal from a first signal including a frequency component representing a frequency offset between a multi-phase local clock signal and a reception data signal and the phase fluctuation component, a second generation unit generates a second signal including the frequency component. The first phase setting circuit updates the first phase setting signal according to the second signal.
摘要:
An optical communication system that connects a plurality of user-side optical line terminating apparatuses (hereinafter referred to as ONUs) to a station-side optical line terminating apparatus (hereinafter referred to as OLT) using a common optical fiber, wherein the ONU as at least a part of the ONUs includes a transceiver having a power saving function for inactivating a transmitting unit while supplying electric power to a receiving unit and a control apparatus that transmits support information of the power saving function to the OLT via the transceiver, and the OLT includes a control apparatus that generates transmission allowance information of upstream communication based on the support information of the power saving function and a transceiver that receives the support information of the power saving function and transmits the transmission allowance information to the ONU.
摘要:
The invention relates to a method for performing a switch operation between a first Optical Line Terminal OLT and a second OLT in a Passive Optical Network PON, said first and second OLTs being connected to a plurality of Optical Network Units ONUs through at least one splitter. The invention enables to avoid the detection of a timestamp drift error during protection switching operation by modifying the threshold of the detection in the second OLT.
摘要:
A PON (Passive Optical Network) system, which modulates multiple subcarriers with data of multiple users to output an optical multiplexed signal from a station device, splits the optical multiplexed signal to transmit the split signals to multiple subscriber devices that are provided for each of the users, and demodulates the data of the users at the respective subscriber devices, includes: an obtaining section configured to obtain a transmission characteristic for each of the subcarriers at each of the subscriber devices, by receiving a test signal at the subscriber devices, which is transmitted from the station device; and an assigning section configured to assign one or more of the subcarriers for each of the subscriber devices suited to the transmission characteristics of the assigned subcarriers at each of the subscriber devices.