Abstract:
PROBLEM TO BE SOLVED: To provide a unit identification method capable of optionally changing identification information about units by defining the number of pins for identification as one in each slot regardless of an increase in units. SOLUTION: A backboard is provided with a shared constant voltage power supply, and a programmable resistance connected to the power supply is arranged in each slot. An inherent voltage value is taken out to a unit identification terminal of each unit by controlling this resistance value. When a unit mounted base board is inserted into a slot, an identification voltage detection circuit of the unit detects the voltage to decide whether or not to be a correct combination.
Abstract:
PROBLEM TO BE SOLVED: To provide an inexpensive, reliable optical amplification device which can prevent optical surge with a simple optical circuit. SOLUTION: An input signal light 40 is inputted to an optical input off detector 43 where the light is branched into two light signals by a CPL(coupler) 45. One of two light signals branched by the CPL 45 is input to a light receiver 46 to be converted therein to an electric signal corresponding to the branched light power. The other light signal branched by the CPL 45 is input to an optical signal cut-off section 44 as it is. The electric signal converted by the light receiver 46 is compared by a controller 48 with a predetermined value. When the electric signal is smaller than the predetermined value, the controller 48 cuts off an optical path of a SW(switch) 47 to an optical direct amplifier 42. When the electric signal is larger than the predetermined value, the controller 48 controls connection of the optical path in such a manner that a control signal to the SW 47 varies more slowly than a time constant for constant output control of the optical direct amplification circuit 42.
Abstract:
PROBLEM TO BE SOLVED: To provide a DWDM transmission system for absorbing an uncontrollable optical output power difference by a function block without spreading a light receivable range of a light reception part at a final step. SOLUTION: An optical signal transmitted via optical amplification parts 3-1 to 3-4 is input to an optical wavelength division 4 at a terminal of a transmission path, and the optical wavelength division 4 returns it to each wave with respect to one fiber, to be input to optical reception parts 5-1 to 5-5 for reception. The optical reception parts 5-1 to 5-5 directly monitor a current flowing a photodiode for use in transmitting a main signal, to be converted from a current to a voltage, and then a CPU processes as information transmitting data to transmit it to the optical amplification parts 3-1 to 3-4 as light receiving power information. This constitutes a loop control of the optical amplification parts 3-1 to 3-4, which change an amplification degree with respect to a wavelength to adjust to come to a light receiving power standard range of the optical reception parts 5-1 to 5-5.
Abstract:
PROBLEM TO BE SOLVED: To detect a break of a connection circuit between LSIs without any interruption of data processing by the respective LSIs and to easily locate the break part. SOLUTION: A data processing part 1 carries out data processing of previously decided contents on an inputted data signal 31 and outputs it as a data signal 32. A circuit break detection part 3 is synchronized with a circuit break detection clock 35, detects a break of the connection circuit between the LSIs (not shown) connected to the pervious step according to a result of the detection of the inspection signal, which is inserted into the data signal 31 outputted from the LSI connected to the previous step, and outputs a circuit break detection alarm 34. A pattern signal insertion part 2 inserts the inspection signal to the data signal 32 for detection of the break of the connection circuit with the LSI (not shown) connected to the following step by the LSI connected to the following step and outputs it to the LSI connected to the following step. COPYRIGHT: (C)2003,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide a CMIP protocol test automating device, capable of saving power for confirming the result of testing and for preparing the test environment of a CMIP protocol level. SOLUTION: A test-performing and comparing part 23 repeats performing of a CMIS service via a test data transmission/reception part 22 according to a test procedure file 11. The part 23 compares the reception data file 13 of an expected value, prepared by a transferring data generation part 21 with data to be received by new performance, with respect to the result of performance to individual CMIS services to automate verify the result of the test. COPYRIGHT: (C)2003,JPO
Abstract:
PROBLEM TO BE SOLVED: To obtain a power supply system capable of reducing an inrush current when a power supply is closed without using a relay circuit at the power supply inputting stage of a power supply circuit. SOLUTION: In response to a check-notifying signal 7-1 that is outputted from an output-checking circuit 6-1 that checks an output of an on-board power supply(OBP) 5-1, a control circuit 8-2 outputs an active control signal 9-2 to the remote control terminal of another OBP 5-2, which is then put into an active state. Consequently, the OBP 5-2, which has been started in response to the active control signal 9-2, converts and outputs the input voltage (a building power supply 2) common with the OBP 5-1.
Abstract:
PROBLEM TO BE SOLVED: To provide a quantization method for a digital phase-locked loop circuit that provides a quantized signal having small errors, even without the need for a high-speed clock signal. SOLUTION: Phase difference signals Vp1 , Vp2 , outputted from a phase comparator circuit 1, are fed to 1st and 2nd quantization circuits 2, 3, the 1st and 2nd quantization circuits 2, 3 quantize the phase difference signals Vp1 , Vp2 by using quantization clocks Φ1, Φ2, whose phases are deviated by 180 deg. by a delay circuit 7 and an adder 4 sums signals outputted from the 1st and 2nd quantization circuits 2, 3.
Abstract:
PROBLEM TO BE SOLVED: To provide a device and method for storage device monitoring which performs monitoring of an address bus with a simple structure and low expenses. SOLUTION: A vertical parity operation is performed in a parity operation circuit 40 with data 37 and an address 32 as objects at the time of data writing, the result of vertical parity operation of this 'address + data' is added to writing data 37 as a parity bit 39 and written in a single port memory. 30. At the time of reading the data, the parity bit 39, which is read at the same time as the data 37 read from the single port memory 30, and the vertical parity operation result of a read memory address as the address 32 given to the single port memory 30 held in an address holding circuit 36 and read-out data 37 are compared at a parity comparison circuit 42, and address bus monitoring is performed by notifying it as a monitoring result 41. COPYRIGHT: (C)1999,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide a protection circuit for ADSL which has the function of suppressing external surge caused by thunder, etc., penetrating into an ADSL circuit, and comprises a maintenance-free small-sized part which will not incur the breakage of a protective element itself, and also meets the required standards. SOLUTION: In an ADSL device, where a line transformer 104 for communication and an IC circuit 105 for ADSL are connected with each other, a first protection part 102 against surges is connected between the two lines between a transmission line 101 and the above line transformer 104 for communication, and a second protection part 103, against a surge for suppression of residual surge voltage, is connected between the two lines between the above line transformer 104 for communication and a circuit element 105 for ADSL, thus two stage constitution of protection against the surge is enabled. COPYRIGHT: (C)2003,JPO
Abstract:
PROBLEM TO BE SOLVED: To shorten the restoration time at the time of dada transfer abnormality in comparison with a conventional device. SOLUTION: In a data transmission device 2, a threshold of the counted number of HEC error signals, which is the condition of output of a resynchronizing trigger signal in an HEL counter part 233. When a reception data signal is received, an HEC error is detected by an HEC detection part 232 at each time of receiving a reception ATM cell, and the resynchronizing trigger signal is outputted when the HEC error exceeds the preliminarily set threshold, and a resynchronous detection part 25 generates a synchronization start signal again based on the resynchronizing trigger signal, and a synchronizing signal from an RX signal is detected again from a switching part 262, and synchronization is started again to restore the normal state in order to obtain the reception data signal from the RX signal, and thus the restoration time at the time of data transfer abnormality is made shorter than that in a conventional device. COPYRIGHT: (C)2003,JPO