摘要:
An optical switching device includes plural wavelength selective switches that respectively have a first port and a plurality of second ports; and an optical coupler that has a plurality of third ports on an input-side or an output-side, respectively optically coupled to the first ports of the wavelength selective switches.
摘要:
An optical transmission device has an optical amplifier, first and second control signal reception units and a transmission unit. The first control signal reception unit receives control signals from a receiving end optical service channel. The second control signal reception unit receives control signals from an operator. The transmission unit transmits to the optical amplifier, either the control signals from the receiving end optical service channel or the control signals from the operator so that the optical amplifier operates in either an automatic level control mode or an automatic gain control mode.
摘要:
Two alarm detecting units required as alarm detecting units for controlling a PSW in order to implement a PSR function, are deleted, and instead the result of an alarm detection output by a conventional alarm detecting unit (E-THRU) for a BLSR function is cross-connected in units of STS-1 frames by an alarm TSA apparatus (E-DROP). In the same way, the result of an alarm detection output by an alarm detecting unit (W-THRU) is cross-connected in units of STS-1 frames by an alarm TSA apparatus(W-DROP). These two cross-connected alarms are compared by a comparing unit (DROP). Based on the result of the comparison the PSW is controlled.
摘要:
A communications system has two transmission circuits, each transmitting a multiplexed signal in both ways. A repeating installation used therein selects either one of the two transmission circuits and terminates management information contained in a signal which flows through a transmission circuit selected by the selecting unit. The repeating installation sets the other non-selected transmission circuit to be in a high impedance state. The selection and termination are commonly performed for the two transmission circuits, and the repeating installation further extracts the management information transmitted and outputs the management information to be outputted. The management information includes a section overhead having management information concerning a repeating section of the communications system, and the repeating installation does not terminate management information concerning a multiplex section. One of the two transmission circuits includes a spare transmission circuit.
摘要:
A routing system for a linear ADM having two drop switches, operates to establish paths according to a relatively simple process and to establish paths according to a program that is relatively small in scale and inexpensive to develop. The routing system includes a first selection switch for selecting one of a plurality of channels connected to a first transmission line and for outputting a first signal transmitted through the selected channel. A first selector selectively outputs and inhibits the first signal transmitted from the first selection switch. The first selection switch and the first selector are provided in one of the drop switches. A second selection switch selects one of a plurality of channels connected to a second transmission line and outputs a second signal transmitted through the selected channel. A second selector inhibits the second signal transmitted from the second selection switch when the first selector outputs the first signal, and outputs the second signal when the first selector inhibits the first signal. The second selection switch and the second selector are provided in the other of the drop switches. The first and second signals are selectively transmitted from the first and second selectors to a transmitter/receiver for lower signal levels.
摘要:
Technology for detecting a frame synchronous pattern that includes a data switch section for performing data rearrangement processing of parallel data having a given frame synchronous pattern; a temporary region detection section for temporarily detecting a candidate of region data containing the frame synchronous pattern from the parallel data; a frame synchronous pattern detection section for detecting the frame synchronous pattern from the temporary region data of the temporary region detection section; and a data switch control section for controlling data rearrangement processing by the data switch section according to the detection state of the temporary region data by the temporary region detection section and to the detection state of the frame synchronous pattern by the frame synchronous pattern detection section, in order to detect precisely the frame synchronous pattern in m parallel data without enabling the detection of m ways of frame synchronous patterns in in parallel data.
摘要:
There is provided a different system transfer method for a ring transmission system and a transmission apparatus for transferring the ring transmission system constructed in the UPSR system to the BLSR system while a line is in service. A control board of the UPSR system is replaced by a control board of the BLSR system. By changing over a path switch, a multiplexing/demultiplexing conversion board of the UPSR system on the non-operating side is replaced by a first multiplexing/demultiplexing conversion board of the BLSR system which is set so as to operate in the UPSR system. Also, by changing over the path switch again, a multiplexing/demultiplexing conversion board of the UPSR system on the non-operating side is replaced by a second multiplexing/demultiplexing conversion board of the BLSR system which is set so as to operate in the UPSR system. Next, the first and second multiplexing/demultiplexing conversion boards are made to operate in the BLSR system, and a line arrangement is changed from the UPSR system to the BLSR system.
摘要:
An add-drop multiplexer contains a partial drop unit and a partial add unit. The partial drop unit selects a number n of first signal(s) of n channel(s) among a number N of first signals of N channels, which are received from a first transmission line, and transmits the n first signal(s) of n channel(s) on at least one second transmission line, where N and n are integers satisfying N>n>0. The partial add unit receives n second signal(s) of n channel(s) from at least one third transmission line, and a number (N-n) of first signal(s) of (N-n) channel(s) among the N first signals of the N channels, which are not selected by the partial drop unit, and transmits on the first transmission line the n second signal(s) of n channel(s) and the (N-n) first signal(s) of (N-n) channel(s) as N third signals of N channels.
摘要:
The present invention concerns the use of optical regenerator equipment for dropping and inserting such things as monitor station data along with a phase compensation method for the regenerator equipment. The optical/electrical converter, which is input with an optical signal, changes it into an electrical signal of first and second parallel data, the first parallel data is input to the multiplexer and the second parallel data is input to the electrical/optical convertor. The clock signal that has been extracted from the optical signal is input to the electrical/optical convertor by using the PLL function which can be an internal of external part of the electrical/optical convertor. The electrical/optical convertor is synchronized with the clock signal, that has been input to it, and changes the various input signals from the multiplexer and optical/electrical convertor into optical signals to output them.
摘要:
A drop/insert selecting system for an optical transmission system has a decreased circuit scale, by providing a switching unit (4,4') having a plurality of input terminals for receiving a plurality of input channels and a plurality of output terminals, each of the input channels conveying a frame synchronization signal and a channel number. At at least one drop/insert unit (51,52,51',52') is provided for sequentially generating channel preselection signals until a frame synchronization is established and for dropping or inserting necessary signals from or into a corresponding one of the necessary channels incorporated into the drop/insert units when a frame synchronization is established. A channel selecting unit (6,6a,6b) is provided for generating a plurality of channel selecting signals in response to each of the channel preselection signals, each of the channel selecting signals functioning to connect each of the output terminals to one of the plurality of input terminals. The remaining output terminals of the switching unit are connected to through-channels to which no drop/insert units are connected.