Multiplex communications – Wide area network – Packet switching
Patent
1993-12-08
1995-02-28
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
H04J 322
Patent
active
053943996
ABSTRACT:
A communication control device includes a transmission speed converting unit having a dual port video RAM containing a RAM and a SAM, and a control unit having a register for storing a data store leading address of the RAM, a register for setting the number of words stored in the SAM, and a CPU. When data are transmitted, a user issues a data transmission request to the CPU in the control unit. According to the request, the CPU reads data from one system at its data transmission speed to the RAM or the SAM of the dual port video RAM, internally transmits the data between the RAM and the SAM, and finally transmits the internally transmitted data to the other system at its data transmission speed. The dual port video RAM absorbs the difference between the data transmission speeds of these two systems, and permits the data transmission at a lower cost than when using a FIFO memory and at a higher speed than when using a buffer memory.
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Fujisono Kenji
Igi Yoso
Kawasaki Keiko
Sumitani Kazuo
Tahira Fumiaki
Fujitsu Limited
Olms Douglas W.
Ton Dang
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