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91. 发明专利

JPS62159553A COMMUNICATION CONTROL EQUIPMENT 失效
公开(公告)号：JPS62159553A
公开(公告)日：1987-07-15
申请号：JP53286
申请日：1986-01-08
申请人： HITACHI LTD
发明人： TAKIYASU YOSHIHIRO , TAKAI ATSUSHI
IPC分类号： H04L29/08 , H04L13/00
摘要： PURPOSE:To avoid the occurrence of an incorrect frame even when a new frame is sent to an unerased frame by sending ineffective data not included in the frame constitution pattern before start flag transmission. CONSTITUTION:Bit serial reception data (a) is converted into parallel data (b) by a serial/parallel conversion section 1, frame erasure decision is applied by a reception decision section 2 to erase the reception data (a) by sending a time fill pattern according to an erasure command signal (d). A data switching section 3 selects a transmission data (i) at the occurrence of a transmission state signal (e) and a time fill pattern (j) at the occurrence of an erasure command signal (d). The reception data (a) is selected except the occurrence of the transmission state signal (e) or the erasure command signal (d) to apply relay operation. The reception decision section 2 has a reception control counter.

92. 发明专利

JPS6273837A TOKEN CONTROL SYSTEM 失效
公开(公告)号：JPS6273837A
公开(公告)日：1987-04-04
申请号：JP21237685
申请日：1985-09-27
申请人： HITACHI LTD
发明人： TAKIYASU YOSHIHIRO , TAKAI ATSUSHI , WADA KENICHI
IPC分类号： H04L12/42
摘要： PURPOSE:To prevent missing fault of token by devising the system that the order of a token frame sent attended with the information frame transmission and a reply frame to own address information frame on a loop is not inverted even when the own address information frame is sent. CONSTITUTION:When no information frame is received after the transmission of own address information frame sent from the own station in a conventional system, a token is not sent from the own outgoing own address information frame transmission node and the token is missing. Thus, when the own outgoing own address information frame is not received, the token has only to be sent immediately. That is, after the transmission of the information frame, a response frame reception time supervisory timer is used to apply reply frame reception supervisoty to the own address information frame and a token frame is sent at time timeout.

93. 发明专利

JPS6268339A TOKEN CONTROL SYSTEM 失效
公开(公告)号：JPS6268339A
公开(公告)日：1987-03-28
申请号：JP20654485
申请日：1985-09-20
申请人： HITACHI LTD , NIPPON TELEGRAPH & TELEPHONE , NEC CORP , FUJITSU LTD
发明人： TAKIYASU YOSHIHIRO , TAKAI ATSUSHI , WADA KENICHI , HOSHIKO TAKAYUKI , IBORI SHOICHI , KAMINOMURA HITOSHI
IPC分类号： H04L12/42
摘要： PURPOSE:To obtain a token control system not causing a fault attended with the missing of a reply frame by sending a token frame after reply frame sending independently of the reply region after each node sends the information frame sent from its own node and addressed to its own node. CONSTITUTION:When the information frame sent attended with the acquisition of transmission right is a frame addressed to its own node, a logic layer decides a frame addressed and sent to its own node ahead the preparation of transmission, functions the sequence control in advance to set the procedure in the order of the transmission instruction of the reply frame and the transmission instruction of a token frame. Then a signal G inhibits the 1st token frame transmission control and follows the token frame transmission instruction from the logic link layer given through a signal line F and then a signal line C. The logic link layer applies the transmission instruction of the reply frame after the reception of the information frame addressed and sent to/from its own node to apply the token frame transmission instruction.

94. 发明专利

JPS612456A NON-SIGNAL DETECTION SYSTEM 失效
公开(公告)号：JPS612456A
公开(公告)日：1986-01-08
申请号：JP12170884
申请日：1984-06-15
申请人： HITACHI LTD
发明人： TAKIYASU YOSHIHIRO
IPC分类号： H04L25/02 , H04L1/20 , H04L25/52
摘要： PURPOSE:To simplify the constitution of an amplifier and to form a monolithic integrated circuit by connecting an asymmetrical differential amplifier of which input signal DC level is different from a reference voltage, a circuit for forming the center level of the double phase output voltages of the differential amplifier and the average level of one-side outputs and a circuit for detecting the difference of both the levels, to the post-stage of a limit amplifier. CONSTITUTION:Since the rise and fall times of a timing clock signal are rapid, the occupation ratio of the output wave of an asymmetrical amplifier 9 having a reference voltage different from an input signal DC level obtained by inputting a clock having 50% occupation ratio is also about 50% and the average level almost coincides with the center level of the clock. On the other hand, the reference voltage of the asymmetrical amplifier 9 is set up to a low level at the time of no signal, so that its output becomes a high level. Therefore, no signal can be detected by comparing the center level of the output of the asymmetrical amplifier 9 with the average level. For instance, V5 is the reference voltage of the asymmetrical amplifier 9. Figure (b) shows the output of the asymmetrical amplifier 9, and since the output is shifted from the center level of the V5, the output is turned to the high level at the time of no signal.

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