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公开(公告)号：US5479582A
公开(公告)日：1995-12-26
申请号：US973585
申请日：1992-11-06
申请人： Lane J. Abrams , Inars Gruntals , Hoo-Yin Khoe , Kevin Loughran
发明人： Lane J. Abrams , Inars Gruntals , Hoo-Yin Khoe , Kevin Loughran
CPC分类号： H04L29/06
摘要： Disclosed is a message oriented interface for communication between a bank controller unit and peripheral devices, such as channel units, in digital loop transmission systems. At least four registers are used for each peripheral device. Two registers are utilized to transmit control signals, and two registers are for data transmission. An additional data register can hold the last byte read by the bank controller unit in the event of an error so the byte can be re-read. The last byte of each message, which is utilized for error detection, is the exclusive OR function of the corresponding bits in all the previous bytes of the message. A service request can be asserted by a peripheral device to the Bank Controller Unit when a control signal is present in one of the registers. Means are also provided for indicating when a register is busy.
摘要翻译： 公开了用于在数字环路传输系统中的银行控制器单元和诸如信道单元的外围设备之间的通信的消息定向接口。 每个外围设备至少使用四个寄存器。 两个寄存器用于传输控制信号，两个寄存器用于数据传输。 发生错误时，附加数据寄存器可以保存银行控制器单元读取的最后一个字节，以便该字节可以被重新读取。 用于错误检测的每个消息的最后一个字节是消息的所有先前字节中相应位的异或功能。 当控制信号存在于其中一个寄存器中时，外围设备可以向Bank控制器单元断言服务请求。 还提供了用于指示寄存器何时忙的装置。
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公开(公告)号：US5018184A
公开(公告)日：1991-05-21
申请号：US548464
申请日：1990-07-03
CPC分类号： H04M3/301 , H04M1/24 , H04M3/303 , H04M2203/058
摘要： Disclosed is a circuit for the automatic testing of channel units such as found in subscriber loop carrier (SLC.RTM.) systems. The circuit is included as part of the remote terminal of the system and performs type tests, power-up tests and routine verification tests. The circuit also monitors the subscriber channel, and connects the subscriber in the event of a ringing signal or an off-hook during a test. The results of the test are sent to a display unit which can be located at the remote terminal and/or the central office.
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