![DataKinetics DSC110 User Manual Download Page 27](http://html1.mh-extra.com/html/datakinetics/dsc110/dsc110_user-manual_511663027.webp)
DataKinetics DSC110 / DSC210 User Manual Issue 12
Page 27
Each PCM port in the system can be designated as a potential clock source and
assigned a relative priority. The PCM port with the highest clock priority that
currently contains a valid PCM signal is used as the synchronisation reference for
the converter. All other outputs from the converter are synchronised to this
reference source. In the event of the active synchronisation source failing, the
converter will select the next highest priority input source as the synchronisation
source. If no inputs contain a valid PCM signal then the converter will use a locally
generated clock reference as the synchronisation source.
Changes of PCM status are reported by the CS6 card to the central processor
card allowing alarms to be entered in the system alarm log
4.3.6 Alarm card
The Alarm card performs a supervisory function within the converter. It contains
the alarm relays and front panel LED driver circuitry to pass alarm indications to
the user and monitoring circuitry for the power supply output rails, the fan fail
detection circuitry and a temperature sensor.
Connection to the alarm relay contacts is via a 15 way D-type socket mounted at
the rear of the Alarm card. Two relays are provided designated “Prompt” and
“Urgent”. In the event of a power failure the alarms both fall back into the alarming
state.
The fan fail detector, temperature and power supply output monitor circuits are
used to detect system failures that are then reported to the central processor.
Such failures are indicated to the user by entries in the Alarm Log and the
respective front panel indicators being switched on.
4.3.7 Network card
The network card allows connection to the converter via Ethernet. This is used to
provide a telnet MML interface for configuring the converter from a remote location
and to transfer data to a Remote Data Centre.