This Phenomenon happen when interconnection our Metro1000 with N company STM-1 port Transmission equipment to become an SNCP ring. so we normally will retrieved clock source from N company STM-1 port. When doing testing and
commissioning, we retrieved intermittent alarm signal (LSS) from our test equipment (ANT-5). So we asking the customers to provide us a better clock source instead of clock source from N company STM-1 port. But unfortunately the customers'
station doesn't have any other clock source port for us any more.
For my case, i still able to retrieve clock source from our own equipments. But if no clock source and don't have any other transmission equipments then please
run on internal clock first and at the same time, please request a better clock source.