Abstract: Variations in a peak power level of add signals due to transmission trouble are to be reduced with a relatively inexpensive and simple configuration. When an input of optical signals to an optical amplifier unit is cut off by transmission trouble, only amplified spontaneous emission light is supplied from the optical amplifier unit. An output power constant control unit amplifies this amplified spontaneous emission light to a certain level. This amplification level is substantially equal to what it would be if the input optical signals were inputted into the optical amplifier unit. This makes it possible to restrain variations in a ratio of OADM add signals to be added to OADM through signals in an OADM unit in time of transmission trouble.

Abstract: In a LAN relaying apparatus, a reception side control circuit receives a reception side write pointer from a reception side write control circuit and a reception side read pointer from a reception side read control circuit, and determines a reception side pointer difference between the side reception side write pointer and the reception side read pointer. Then, the control circuit controls the reception side read control circuit to start the second side read operation when the reception side pointer difference is equal to a reception side first threshold held therein. Subsequently, the reception side control circuit controls the reception side write control circuit and the reception side read control circuit such that the first side write operation or the second side read operation is carried out based on the reception side pointer difference, when the reception side pointer difference is not equal to the reception side first threshold after the start of the second side read operation.

Abstract: A voltage clamp transistor 12 has a main current path (i.e., drain-source path or emitter-collector path) serially connected to the output terminal 9 of a drive IC 1, and also has a control electrode (i.e., gate or source) with a predetermined voltage applied thereto. An optical modulator 10 of a laser diode or the like is connected either directly or via an AC-coupled capacitor to the output side of the transistor 12.

Abstract: In an information processing system, information defining a business process is classified into demand information, which is a request instruction from a requester, and supply information, which is a result report to the requester, this demand and supply information being stored into a 5W1H-format database, in which the information is made up combinations of 5W (who, whom, when, where, and what) and 1H (how) elemental information, management of a business process being performed based on these information.

Abstract: Disclosed is a FAX signal transmission system, in which the transmission side and the reception side are inter-coupled by a bearer. Each side is constituted by DCME comprising a transmission side, which includes a signal identification circuit 3, a FAX data allotment control circuit 4, a delay circuit 9, a FAX data demodulation circuit 11, a FAX data allotment signal generation circuit 13 and a multiplexing circuit 14, and a reception side, which includes a FAX data distribution control circuit, a FAX data transmission circuit and a FAX data remodulation circuit. The transmission side is provided with a control terminal for inputting signal identification data. The input signal identification content of the signal identification circuit 3 can be changed according to the signal identification data.