Excavating
Patent
1995-11-24
1998-05-26
Beausoliel, Jr., Robert W.
Excavating
39518319, 39518509, G06F 1100
Patent
active
057578109
ABSTRACT:
A digital cellular communications system has a bidirectional transmission link for conveying encoded speech and control data in the form of blocks, a switching unit coupled to a first end of the transmission link, and a base station coupled to a second end of the transmission link. The switching unit includes a speech encoder for encoding speech signals, an error detection code generator for generating an error detection code from the encoded speech signal, and a formatter, coupled to the error detection code generator, for producing a formatted block to be transmitted on the transmission link, the formatted block having a header, the encoded speech data, and the error detection code. The base station has a transmission link error detector for signalling the existence of an error in a received block in response to the received block containing an error. Similarly, the switching unit has a transmission link error detector for signalling the existence of an erroneously received block which has been transmitted in the uplink direction. The number of errors is monitored by a transmission link supervisor which reports if the errors indicate that the quality of the transmission link has degraded beyond a predetermined threshold.
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European Standard Search Report No. RS 96058 Date of completion of search: 6 Jun. 1996.
Beausoliel, Jr. Robert W.
Telefonaktiebolaget LM Ericsson
Tu Trinh L.
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