摘要:
A device for detecting absence of a Plain Old Telephony Service or POTS splitter on a Digital Subscriber Line, includes a device for collecting channel transfer function data or the Digital Subscriber Line, and a device for detecting a single hole in the channel transfer function data.
摘要:
The present invention refers to a method (45) for identification (53, 73) of an impairment (59) within a telecommunication line (13), the method (45) comprising determining (49) first measurement data (Hlog) that characterize a transfer function of the telecommunication line (13). In order to provide a method (45) for identification of an impairment (59) within the telecommunication line (13) that can be applied on the telecommunication line (13) without interrupting the operation of the line (13) and that can easily be implemented in connection with existing system such as existing DSL systems, it is suggested that the method (45) further comprise determining (55) at least one periodicity interval (Δf1, Δf2) of oscillations of the transfer function and that the impairment (59) be identified depending on said determining (55).
摘要:
The invention discloses an access apparatus and method for digital subscriber line test. The apparatus includes: one or more distributed access matrix control modules, one or more distributed access matrixes; and a power converter module. The distributed access matrix control module is connected to a test module and at least one of the one or more distributed access matrixes which is under the control of the distributed access matrix control module, and is configured to send a test task initiated by the test module to the at least one distributed access matrix and report a message from the at least one distributed access matrix to the test module. The distributed access matrix is configured to connect a tested subscriber in accordance with the test task and report an access success message to the distributed access matrix control module.
摘要:
A noncontact sensor detects the signal waveform of analog and digital signals transmitted individually and, alternately, in combination, in designated transmission frequency bands on a pair of conductors.
摘要:
A monitor access is gradually applied an removed from a communications circuit, including a digital subscriber line (DSL), by a gradual monitor access (GMA) technique, in which a variable impedance element is gradually applied to the communications circuit until the monitor can be introduced to the communications circuit without data disruption.
摘要:
A digital signal processor is provided with the facility to measure accurately, and nonintrusively, the levels of noise and/or speech signals appearing on an in-service network connection.
摘要:
An apparatus for decoupling a radio-frequency signal transmitted on a data transmission line having a first line element and a second line element, or for decoupling interference voltages includes: a tapping module, connected to the first and second line elements at a first tapping location of the data transmission line, for decoupling the radio-frequency signal or interference voltages; a current probe module, coupled to the first line element at a second tapping location of the data transmission line; and an output capable of being matched to different input impedances of a device connected to the output.
摘要:
A system for performing a single ended line test (SELT) of a selected subscriber line within a bundle of in-service subscriber lines each supporting frequency division multiplexed multi-tone modulated XDSL communications. The system comprises: a crosstalk cancellation module and a SELT module. The crosstalk cancellation module is coupled to the subscriber lines and configured to cancel crosstalk between the selected subscriber line under test and the in-service subscriber lines. The SELT module couples to the crosstalk cancellation module and is configured to coordinate SELT testing with the crosstalk cancellation module to cancel crosstalk between the selected subscriber line and the in-service subscriber lines during testing.
摘要:
A computer-implemented method for data recording includes defining a rule, the rule identifying data items exchanged between an originating endpoint and a recipient endpoint over a communication network, having nodes, as target data items for storage by a storage device. The storage device has a communication address. A node of the communication network is configured with the rule and with the communication address of the storage device. The rule causes the node to recognize the target data items while forwarding the data items between the originating and recipient endpoints and to forward respective copies of the recognized target data items to the communication address of the storage device.
摘要:
A non-intrusive signal quality assessment apparatus includes a feature vector calculator that determines parameters representing frames of a signal and extracts a collection of per-frame feature vectors (φ;(n)) representing structural information of the signal from the parameters. A frame selector preferably selects only frames (Ω\with a feature vector (φ;(n)) lying within a predetermined multi-dimensional window (⊖). Means determine a global feature set (ψ) over the collection of feature vectors (φ;(n)) from statistical moments of selected feature vector components ((1̂,01, . . . O11). A quality predictor predicts a signal quality measure (Qj from the global feature set (ψ)).