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DS2154 Datasheet(PDF) 28 Page - Dallas Semiconductor |
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DS2154 Datasheet(HTML) 28 Page - Dallas Semiconductor |
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28 / 87 page  DS2154 28 of 87 AUTOMATIC ALARM GENERATION When either CCR2.4 or CCR2.5 is set to 1, the DS2154 monitors the receive side to determine if any of the following conditions are present: loss of receive frame synchronization, AIS alarm (all 1s) reception, or loss of receive carrier (or signal). If any one (or more) of the above conditions is present, then the DS2154 will either force an AIS alarm (if CCR2.5=1) or a Remote Alarm (CCR2.4=1) to be transmitted via the TPOSO and TNEGO pins. It is an illegal state to have both CCR2.4 and CCR2.5 set to 1 at the same time. If CCR2.4=1, then RAI will be transmitted according to ETS 300 011 specifications and a constant Remote Alarm will be transmitted if the DS2154 cannot find CRC4 multiframe synchronization within 400 ms as per G.706. |
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