摘要:
A method for monitoring a passive optical network (1), PON, having a tree-like structure with a main line (3) and at least two branches (6.1 to 6.3), comprising: transmitting a wake-up signal (10) from the main line (3) to at least two monitoring units (DPM1 to DPM3) arranged in the at least two branches (6.1 to 6.3), in each of the monitoring units (DPM1 to DPM3), detecting the wake-up signal (10) and transmitting a response signal (A, B, C) back to the main line (3), each of the monitoring units (DPM1 to DPM3) generating a pre-defined time delay (Δt A to Δt c ) between the detection of the wake-up signal (10) and the start of the transmission of the response signal (A, B, C), and receiving the response signals (A, B, C) at the main line (3), the receiving times (R1 to R3) of the response signals (A, B, C) being different from each other, the difference between the receiving times (R1 to R3) being adjusted by the pre-defined time delays (Δt A to Δt c ) of the monitoring units (DPM1 to DPM3).
摘要:
The invention relates to a method of swept sine wave OTDR (optical time domain reflectometry) measurement, wherein a data signal (5), which carries payload data, is modulated by a sine wave signal (7) on top of the payload data of the data signal (5), thus generating a modulated optical output signal (12), wherein the sine wave signal (7) is swept within a defined frequency range, characterized in that the modulation amplitude of the modulated optical output signal (12) is monitored, and the amplitude of the sine wave signal (7) is controlled in dependence of the modulation amplitude of the modulated optical output signal (12) monitored during the present frequency sweep such that the monitored modulation amplitude of the modulated optical output signal (12) matches a predefined value distribution over the whole frequency range. The inventive method allows an accurate calibration of an OTDR measurement equipment without an interruption of the data traffic.
摘要:
The invention relates to a method for performing network functions for a subscriber-sided (CPE) network access unit (ONT) in a telecommunication's access network with a central unit (CO, OLT), a distribution network (AN), and a multiple of network-sided network termination units (DPD) with subscriber-sided network access units (ONT) connected or connectable thereto, in which network a bidirectional communication path (1) is present between the central unit (CO) and that network-sided network termination unit (DPD), to which the subscriber-sided network access unit (ONT) under consideration is connected, in which for performing network functions a further bidirectional communication path (2) between the subscriber-sided network access unit (ONT) under consideration and the corresponding network-sided network termination unit (DPD) is used in connection with the bidirectional communication path (1) between the ccn tral unit (CO, OLT) and that network-sided network termination unit (DPD), as well as to a telecommunication's access network ( Figure 1 ), a central unit (CO, OLT), a network-sided network termination unit (DPD), and a subscriber-sided network access unit (ONT).
摘要:
An optical network (1, 2) having a tree-like structure with a main line (3) and a plurality of branches (6.1 to 6.3), at least two of the branches (6.1 to 6.3) comprising a monitoring unit (10.1 to 10.3) for upstream signalling to the main line (3), wherein each of the monitoring units (10.1 to 10.3) comprises a signal generation unit (18.1 to 18.3) with a light source for generation of a pre-defined optical signal (11.1 to 11.3), and the monitoring units (10.1 to 10.3) are construed to generate pre-defined optical signals (11.1 to 11.3) which are different from each other, as well as a monitoring unit for generating a periodic upstream signal in such an optical network (1, 2) and a method for monitoring such an optical network (1, 2).
摘要:
Proposed is a method of monitoring a connectivity of an optical network terminal to an optical output port of a remote node in an optical access network. A network analyzer transmits a control signal that indicates a request for modulating a power level of an optical downstream signal at a dedicated optical output port of a remote node. A controller receives the control signal from the network analyzer and transmits an output control signal indicating the output port to said remote node. The remote node receives the output control signal and activates an optical modulation device present at the output port. An optical network terminal indicates reception levels of a received downstream signal for successive time instances. The network analyzer retrieves reception level data and furthermore derives a potential connection of the optical network terminal to the dedicated output port.