Abstract: A method for measuring an end-to-end Service Level Agreement (SLA) in a network having entities of different mobile communication networks is provided. The method includes sending a server a test condition for SLA measurement, sending the server a test packet, obtaining from a test result received from the server parameter values for metrics included in the test condition, generating analysis data based on the test condition, and sending the analysis data to a manager unit for the entities based on the test condition.

Abstract: A method for measuring an end-to-end Service Level Agreement (SLA) in a network having entities of different mobile communication networks is provided. The method includes sending a server a test condition for SLA measurement, sending the server a test packet, obtaining from a test result received from the server parameter values for metrics included in the test condition, generating analysis data based on the test condition, and sending the analysis data to a manager unit for the entities based on the test condition.

Abstract: Disclosed is a packet switch equipment and a band control method using same. In accordance with one embodiment of the invention, a number of packets are sampled by using a packet sampling function provided by a packet switch chip, and the sampled packets are transmitted to a CPU. By using the transmitted sample packets, the total amount of bandwidth used by a corresponding user is estimated based on the source MAC address or the source IP address. If the estimated value exceeds a predetermined threshold, a bandwidth limitation function is applied to the user that is providing packets that exceed the bandwidth. A number of users can be dynamically recognized even when they are undefined, and a dynamic bandwidth limitation function is performed by tracking the bandwidth used by a corresponding user.

Abstract: A fiber to the home (FTTH) system based on a passive optical network (PON) includes an optical line terminal (OLT) block, an optical network terminal (ONT) block, and an optical distribution network (ODN). The ONT block includes a video-optical line terminal (V-OLT) and an OLT to output optical signals of the V-OLT and the OLT by multiplexing the optical signals. The V-OLT receives cable TV (CATV), master antenna (MATV), and satellite broadcasting (SB) optical signals inputted from a broadcasting service network to output received signals as a first optical signal having a predetermined wavelength band. The ONT block includes a video-optical network terminal (V-ONT) and an (ONT) to split multiplexed data communications signals, and CATV broadcasting, MATV broadcasting, and (SB) optical signals. The V-ONT processes the split CATV broadcasting, MATV, and (SB) optical signals to provide subscribers with the split cable CATV, MATV and SB optical signals.

Abstract: Disclosed is a packet switch equipment and a band control method using same. In accordance with one embodiment of the invention, a number of packets are sampled by using a packet sampling function provided by a packet switch chip, and the sampled packets are transmitted to a CPU. By using the transmitted sample packets, the total amount of bandwidth used by a corresponding user is estimated based on the source MAC address or the source IP address. If the estimated value exceeds a predetermined threshold, a bandwidth limitation function is applied to the user that is providing packets that exceed the bandwidth. A number of users can be dynamically recognized even when they are undefined, and a dynamic bandwidth limitation function is performed by tracking the bandwidth used by a corresponding user.

Abstract: A peak detector for detecting a peak value of a burst signal in a burst mode optical receiver is disclosed, which comprises: an amplifying terminal configured to reduce an offset of a peak value in a received burst signal using feedback in the peak detector; a transistor that functions as a diode when a positive signal is received from the amplifying terminal; a peak hold capacitor for charging a peak value when the transistor received the positive signal; a signal amplitude detector to monitor the received burst signal amplitude; and a current source to drive a current responsive to the output signal amplitude detector.

Abstract: A local switching method using a logical link ID (LLID) in an Ethernet passive optical network (EPON) system is disclosed. The local switching method includes a first step of an optical network unit (ONU) receiving and separating data inputted through a user port into a wide area network (WAN) traffic and a local area network (LAN) traffic, allocating the LLID according to a service for each traffic to the separated WAN traffic and LAN traffic, and transmitting the WAN traffic and LAN traffic with the LLIDs allocated thereto; and a second step of an optical line termination (OLT) receiving the WAN traffic and LAN traffic with the LLIDs allocated thereto transferred from the ONU, extracting a destination of the corresponding traffic through the LLIDs, and transmitting the respective traffic accordingly.

Abstract: Disclosed is a method, apparatus and computer product for controlling proportional allocation transmission through an OLT scheduling algorithm in an EPON based FTTH system. The method includes computing a total transmission capacity for Optical Network Terminations (ONTs) connected to the OLT, computing a number of transmissions according to the ONTs, storing the computed number of transmissions according to the ONTs in a storage unit, determining a transmission order for each ONT based on the number of transmissions according to the ONTs, and transmitting data according to the determined transmission order.

Abstract: A solution for allowing conditional access to IP-based broadcast services in a passive optical network is disclosed. When a subscriber requests broadcast services by selecting a broadcast channel, an IP set-top converts the request into an IGMP join message and forwards the message to an ONU/ONT, a unit on the subscriber's side. The ONU/ONT delivers the message to an OLT interworking with a router while storing mapping information of the port that received the message and a MAC address of the selected channel. Thereafter, the OLT extracts information on MAC address of the IP set-top box and the requested broadcast data. The OLT compares the extracted information to the subscriber's subscription information and determines whether to provide the requested broadcast services. If the broadcast services may be provided, the broadcast data provided from the broadcast server is transmitted to the IP set-top box via ONU/ONT based on the stored mapping information.

Abstract: A method for managing an IP address statically allocated to a slave slot through a master slot is disclosed If the power of a slave slot is on, confirming whether the slave slot has a static IP, and if not, confirming whether the slave slot has a DHCP (Dynamic Host Configuration Protocol) IP. Confirming whether the slave slot has a slot ID from a backplane if the slave slot has the static IP, and confirming whether the slave slot has the slot ID from the backplane if the slave slot has the DHCP IP. Confirming whether a master slot has a static IP, and performing an IPC communication if the slave slot has the slot ID. If the slave slot has neither the static IP nor the DHCP IP, a discovery operation is performed to obtain the IP information if the master slot does not have the static IP.

Abstract: There is provided an optical signal monitoring method and apparatus for measuring the characteristics of an input WDM optical signal. In the optical signal monitoring method, the WDM optical signal is combined with reference lights at both sides of the WDM optical signal on the wavelength spectrum. The combined signal is input to a filter having a variable transmission wavelength according to an applied driving voltage. A driving voltage-light intensity graph of a combined optical signal detected from the filter is derived in its overall wavelength band. A linear approximated wavelength is obtained with respect to a driving voltage and a non-linear compensated wavelength is calculated in a predetermined non-linear compensation formula with the driving voltage and the operation temperature of the filter.

Abstract: A fiber to the home (FTTH) system based on a passive optical network (PON) includes an optical line terminal (OLT) block, an optical network terminal (ONT) block, and an optical distribution network (ODN). The ONT block includes a video-optical line terminal (V-OLT) and an optical line terminal (OLT) in order to output optical signals of the video-optical line terminal (V-OLT) and the optical line terminal (OLT) by multiplexing the optical signals. The VOLT receives cable TV, master antenna TV, and satellite broadcasting optical signals inputted from a broadcasting service network so as to output received signals as a first optical signal having a predetermined wavelength band. The OLT includes a first downstream data optical transmitter and a first upstream data optical receiver and outputs a data communication signal inputted from a data service network as a second optical signal having different wavelength from the video-optical line terminal.

Abstract: Disclosed is a bi-direcional wavelength-division multiplexing optical communication system including a first optical transmitter/receiver unit for transmitting a forward optical signal composed of a plurality of channels respectively allocated with wavelengths having a desired wavelength space while receiving a reverse optical signal composed of a plurality of channels respectively allocated with wavelengths each interleaved between associated ones of the wavelengths of the forward optical signal, a second optical transmitter/receiver unit for transmitting the reverse optical signal while receiving the forward optical signal, an optical fiber coupled between the first and second optical transmitter/receiver units, the optical fiber serving as a transmission medium for the forward and reverse optical signals, and an optical amplifier device arranged on the optical fiber and adapted to interleave the channels of the forward and reverse optical signals, bi-directionally received via the optical fiber, in accorda

Abstract: A peak detector for detecting a peak value of a burst signal in a burst mode optical receiver is disclosed, which comprises: an amplifying terminal configured to reduce an offset of a peak value in a received burst signal using feedback in the peak detector; a transistor that functions as a diode when a positive signal is received from the amplifying terminal; a peak hold capacitor for charging a peak value when the transistor received the positive signal; a signal amplitude detector to monitor the received burst signal amplitude; and a current source to drive a current responsive to the output signal amplitude detector.

Abstract: There is provided an optical signal monitoring method and apparatus for measuring the characteristics of an input WDM optical signal. In the optical signal monitoring method, the WDM optical signal is combined with reference lights at both sides of the WDM optical signal on the wavelength spectrum. The combined signal is input to a filter having a variable transmission wavelength according to an applied driving voltage. A driving voltage-light intensity graph of a combined optical signal detected from the filter is derived in its overall wavelength band. A linear approximated wavelength is obtained with respect to a driving voltage and a non-linear compensated wavelength is calculated in a predetermined non-linear compensation formula with the driving voltage and the operation temperature of the filter.

Abstract: Disclosed is a bi-direcional wavelength-division multiplexing optical communication system including a first optical transmitter/receiver unit for transmitting a forward optical signal composed of a plurality of channels respectively allocated with wavelengths having a desired wavelength space while receiving a reverse optical signal composed of a plurality of channels respectively allocated with wavelengths each interleaved between associated ones of the wavelengths of the forward optical signal, a second optical transmitter/receiver unit for transmitting the reverse optical signal while receiving the forward optical signal, an optical fiber coupled between the first and second optical transmitter/receiver units, the optical fiber serving as a transmission medium for the forward and reverse optical signals, and an optical amplifier device arranged on the optical fiber and adapted to interleave the channels of the forward and reverse optical signals, bi-directionally received via the optical fiber, in accorda

Abstract: In an optical amplifier including an optical wavelength selective coupler for coupling an input optical signal by a wavelength selective coupling method, a gain medium for amplifying a signal from the optical wavelength selective coupler and outputting the amplified signal, and a pump connected to the optical wavelength selective coupler for causing a population inversion in the gain medium, an all optical gain-clamped amplifier further includes a nonlinear mineral material provided at the next part of the gain medium for restricting a signal output of the gain medium by emitting stimulated Brillouin scattered light, inputting it back to the gain medium and saturating the gain medium when the intensity of the input signal output from the gain medium is larger than preset standard value.