专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

DE1512888A1 未知
公开(公告)号：DE1512888A1
公开(公告)日：1969-06-12
申请号：DE1512888
申请日：1967-04-14
申请人： NIPPON TELEGRAM AND TELEPHONE , OKI ELECTRIC IND CO LTD , NIPPON ELECTRIC CO , FUJITSU LTD , HITACHI LTD
发明人： TASHIRO JOJI , ARAKI NOBURU , ASHIHARA KAZUO , ANDO TOSHIO , ODERA EIICHI , HIRAGI SADAYUKI , ITOH KAZUO , OZAWA YUKIO , INOUE KOSUKE
IPC分类号： H04Q3/54 , H04Q3/48
摘要： An intraoffice trunk switching system wherein a connecting path between the called subscriber and the intraoffice trunk is established first; the connecting path between the calling subscriber and the intraoffice trunk to which the called subscriber is connected is then selected so that if no idle channel is available the first connecting path is released and simultaneously therewith the connecting operation between the calling subscriber and the intraoffice trunk is stopped and an idle intraoffice trunk is selected. The connecting path between the called subscriber and the selected intraoffice trunk is established and then the connecting path between the calling subscriber and the selected intraoffice trunk is set to improve the link block ratio of the intraoffice connection.

2. 发明专利

GB1170250A Telephone Switching System 未知
公开(公告)号：GB1170250A
公开(公告)日：1969-11-12
申请号：GB5161266
申请日：1966-11-17
申请人： HITACHI LTD , NIPPON TELEGRAM AND TELEPHONE
发明人： CHIKAI II , KONDO EIROKU , KUWABARA MOTOSUKE , HISAMURA MAKOTO , NAKAZIMA HAZIME , TASHIRO JOJI
IPC分类号： H04Q3/00
摘要： 1,170,250. Automatic exchange systems. HITACHI Ltd., and NIPPON TELEGRAM R. TELEPHONE PUBLIC CORP. 17 Nov., 1966, No. 51612/66. Heading H4K. In a marker controlled local exchange connected by trunks L R to a parent exchange, a calling subscriber is initially connected to a register R which automatically seizes one of the trunks via a switch train RL separate from the main speech switch train LLF and repeats further digits over the separate switch train until such time as the main speech train is completed, whereafter further digits are repeated over this train and the register and separate train are released. If the initially dialled digits signify a local call, the trunk and 'the connection thereto are released and the register and marker complete the call in the normal manner (link IOT). If the first digit is O, a toll trunk LT is seized over the separate switch train and digits are repeated to this trunk in a manner similar to the above, the trunk to the parent exchange being released. Incoming trunks ICT are connected via the switch train RL to a register. In this case if the iitial digit which is suppressed signifies a tandem call, the register is connected via a relay selector TC (Fig. 5, not shown) to a both-way trunk BWTR leading to the wanted sub-exchange LE and digits are repeated over this path. When digit repeating is completed, the incoming trunk is connected via switches LLF to BWTR and the path via TC is dropped. For such tandem calls, ringing at the sub-exchange is controlled by relays in the trunk circuit of BWTR (Fig. 6, not shown). The switches LLF and RL comprise cross-bars, the operation of the latter in response to seizure of a register being described with reference to Figs. .3 and 4 (not shown). The initial digit(s) discriminator comprises a contact tree having relays connected to the relevant outlets for controlling the various kinds of call (Fig. 3, not shown). The subexchange LE is of the step-by-step type.

3. 发明专利

DE1487616A1 未知
公开(公告)号：DE1487616A1
公开(公告)日：1969-01-23
申请号：DEH0061256
申请日：1966-12-12
申请人： HITACHI LTD , NIPPON TELEGRAM , TELEPHONE PUBLIC CORP
发明人： II CHIKAI , KONDO EIROKU , KUWABARA MOTOSUKE , HISAMURA MAKOTO , NAKAZIMA HAZIME , TASHIRO JOJI
IPC分类号： H04Q3/54

4. 发明专利

DE1487616C3 未知
公开(公告)号：DE1487616C3
公开(公告)日：1977-08-18
申请号：DEH0061256
申请日：1966-12-12
申请人： HITACHI LTD , NIPPON TELEGRAM & TELEPHONE
发明人： II CHIKAI , KONDO EIROKU , KUWABARA MOTOSUKE , HISAMURA MAKOTO , NAKAZIMA HAZIME , TASHIRO JOJI
IPC分类号： H04Q3/54 , H04Q3/48

5. 发明专利

DE1487616B2 未知
公开(公告)号：DE1487616B2
公开(公告)日：1973-03-22
申请号：DEH0061256
申请日：1966-12-12
申请人： HITACHI LTD , NIPPON TELEGRAM & TELEPHONE
发明人： II CHIKAI , KONDO EIROKU , KUWABARA MOTOSUKE , HISAMURA MAKOTO , NAKAZIMA HAZIME , TASHIRO JOJI
IPC分类号： H04Q3/54 , H04Q3/42

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式