Issue
What do the LEDs indicate on a MSC-NC or MSC-NCM?
Environment
DMS
Cause
Communications is down on a jobsite. Trying to troubleshoot the MSC-NCM.
Resolution
Here is the function of each LED:
WDT: indicates processor and MSC-NCM communication status. One blink/second indicates that the MSC-NCM is communicating with at least one Microsmart controller. Two blinks/second indicate that the MSC-NCM processor is functioning but the MSC-NCM is not communicating with any controllers. If it is blinking very fast, the MSC-NCM processor is functioning but the MSC-NCM program has not been downloaded into the controller (hence, the system is down).
ALARM: indicates a service or point alarm condition exists somewhere on the controller trunk
TxD: indicates data transmitted
RxD: indicates data received
DCD: illuminates when the Data Carrier Detect signal is active (used with modems)
RING: illuminates when the modem detects an incoming call
