There is no signal on the input of the PCM interface.
Reception of a signal sequence (min. 512 bit) consisting of only ?1"s. It is given by the transmitting interface, if it goes wrong.
There is no frame synch. This bit indicates that the PCM interface lost the frame synchronous signal.
Reception of a signal sequence consisting only ?1?s (AIS) in the 16. timeslot of the PCM frame.
There is no CAS multiframe synch. Interface cannot find/lost the CAS multiframe synchronous signal in the PCM signal connected to the input.
Remote alarm reception. This bit is the second bit of the 0. service timeslot of the PCM signal connected to the input. This bit was used for indicating the error occurred at a remote end of the PCM link. Example:
+-------+ +-------+
| PCM A |--->--- x --->----| PCM B | LOS
RAI | |--------<---------| |
+-------+ +-------+
This bit is the 6. bit of the 16. timeslots of the PCM signal connected to the input, which timeslot is the 0. timeslot of the multiframe. This bit is used for indicating the loss of multiframe occurred at a remote point of the PCM link.
This bit indicates that the PCM interface lost the CRC-4 multiframe.
The interface evaluates the Si-bits in the 13. and 15. frames of the received PCM signal. These bits are used for indicating the CRC errors occurred at the remote point of the PCM link.
This bit changes its state, when there is a slip between the PCM signal and the signal on the internal data bus of the instrument.
This bit indicates the stop of measurements executed with PRBS signals (e.g. BERT). Stopping criterion: if the error rate in the line is larger than 1E-2.
