Inventor

ASHI YOSHIHIRO

JP89 patents

⚠️ This page may combine multiple inventors who share the name “ASHI YOSHIHIRO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

ASHI YOSHIHIRO

HITACHI LTD

Passive optical network (PON) system

Optical fiber transmission system and supervision method of the same

Control method and apparatus for path switching in ring network

Optical transmission system constructing method and system

Failure restoration method in a mesh network

Shared buffer memory type ATM communication system and method with a broadcast facility

Cell multiplexer having cell delineation function

Cell multiplexer having cell delineation function

Path switching method, path switching apparatus and nodes of UPSR

Self-healing ring switch and method of controlling the same

Self-healing ring switch and method of controlling the same

Method of processing inclusively STM signals and ATM signals and switching system employing the same

ATM switch and control method thereof

Switch for self-healing ring

Method and apparatus for transmission of failure information of virtual path in ATM network

System switching method and apparatus without loss of signal in cell switching system of asynchronous transfer mode

Optical transmission equipment which transmits an amplified optical data signal and an optical surveillance signal

Optical wavelength multiplexing system

Optical repeater and optical transmitter

Routing method and apparatus for switching between routing and conversion tables based on selection information included in cells to be routed

Atm switch and atm multiplexer

Add drop multiplexer

Path switching method, path switching apparatus and nodes of UPSR

Virtual path connector and virtual path tracing method and apparatus

Communication system and its device

Optical communication system

ATM switch and control method thereof

Optical multiplex transmission equipment and method

Optical access system

Optical transmission system constructing method and system

Optical transmission equipment which transmits an amplified optical data signal and an optical surveillance signal

Optical repeater and optical transmitter

ATM switch and control method thereof

Optical transmission system constructing method and system

Method of controlling a frame phase of a time-division switch and frame phase variable time-division switch

Method and apparatus for frame phase conversion of signal having frame structure

Configuration method of multiplex conversion unit and multiplex conversion unit

Data multiplexing system having at least one low-speed interface circuit connected to a bus

Data multiplexing system having at least one low-speed interface circuit connected to a bus

HITACHI COMM TECH LTD

PON system and optical network unit

Bit synchronization circuit with phase tracking function

Transmission apparatus with function of multi-step bandwidth assignment to other communication apparatuses

PON system

Optical access system

Communication system, master communication device, and slave communication device

Shaping apparatus, communication node and flow control method for controlling bandwidth of variable length frames

MIZUTANI MASAHIKO

Communication system, subscriber accommodating apparatus and communication method

Passive optical network system and fault determination method

Multicast path management and protection

NIPPON TELEGRAPH & TELEPHONE

High throughput supervisory system for ATM switching systems transporting STM-N signals