发明名称 Digital communication link monitoring device
摘要 Digital transmission service offerings provided by common carriers are characterized by digital terminations at two or more user locations. The user has access only to the digital clock and data signals. A modem is described which when attached to the digital terminations provides three functions. First it allows the user to pass his data over the digital service channel. Second it measures the digital communication error rate and availability. Third it permits the user to pass a low speed telemetry channel over the digital service in addition to normal user data. The modem measures the digital channel bit error rate and provides a secondary or side channel without interfering with the transmission of normal data.
申请公布号 US4558317(A) 申请公布日期 1985.12.10
申请号 US19820442317 申请日期 1982.11.17
申请人 PARADYNE CORPORATION 发明人 ARMSTRONG, THOMAS R.
分类号 H04L1/24;(IPC1-7):H04Q9/00;G06F11/00;H04J3/02 主分类号 H04L1/24
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