Fujitsu Corporation

Masanobu Edasawa

Hisayoshi Kuraya

Takashi Suzuki

Hiroshi Yoshida

Motoshi Hamasaki

Hiroshi Murakawa

Takeshi Toyoyama

Hideo Emoto

A pointer processing apparatus in an SDH transmission system used to serially conducting a pointer process on inputted multiplex data has an address generating unit for allocating an address to each channel of the multiplex data, a RAM for holding an information group obtained by a pointer extracting process and a pointer process, and RAM controlling unit for controlling a sequence of an operation to write-in/read-out the RAM to serially conduct the pointer process on the received multiplex data, thereby largely decreasing the circuit scale, the power consumption, the number of distributions and the like. A POH terminating operation process is conducted in a POH terminating operation process unit, and an obtained result of the POH terminating operation is stored in a storage area for a corresponding channel of a storage unit, whereby the POH terminating operation process can be conducted without separating a multiplex signal into channels. By conducting the POH terminating operation process on the multiplex signal without separating the multiplex signal into channels, a scale and a power consumption of an apparatus can be largely decreased.

Pointer processing apparatus, POH terminating process apparatus, method of POH terminating process and pointer/POH terminating process apparatus in SDH transmission system

There is provided a communication system () such as an ATM-PON including a station-side unit () having a point-to-multipoint message generating unit (A) and a group designation message generating unit (B) and subscriber-side units (-to-N: N is a natural number) each having a point-to-multipoint message processing unit (A) and a state control unit (B). The station-side unit () sends a group designating message to some of the subscriber-side units (-=1 to N), thereby to designate some of the plurality of the subscriber-side units as a component constituting a group of units which are to receive a point-to-multipoint message, and only the subscriber-side units (-) controls to bring the reception and the processing on the point-to-multipoint message to a valid status. With this arrangement, only specified components constituting a group of units can be made to receive the point-to-multipoint message. Thus, it becomes possible to avoid unexpected erroneous operation which can be caused if information specific to a vendor of some of the subscriber-side units (-) is sent to all of the subscriber-side units. Moreover, it becomes possible to provide information to the specified components constituting a group of units within a very short period of time.

Communication system, method of processing message in communication system, and station-side unit and subscriber-side unit

In an information transceiver system for transmitting/receiving specific information, an information transmission device transmits a key message in which a specific information cipher key is ciphered with a usual key, and transmits to a destination information reception device a cipher message in which specific information is ciphered with the specific information cipher key. The information reception device deciphers a specific information cipher key included in a key message with a usual key, and deciphers with the specific information cipher key the cipher message following the key message. Also, in the presence of a plurality of destination information reception devices, the information transmission device provides to the information reception devices setting information of broadcast setting information of a unicast, a broadcast, or the like, cipher setting information, vendor setting information, group setting information, or the like.

Information transceiver system

Pointer processing apparatus, POH terminating process apparatus, method

Growing community of inventors

Yokohama, Japan

Masanobu Edasawa