Zhone Technologies IMACS-200 manual Owan Alarms, Optional Redundant Owan Port

On the transmit signal side, the CMI encoded DS2 or E2 signal is fed into a laser driver from the CMI encoder. On the receive signal side, the electrical signal is then fed through an digital multiplexer to the clock recovery circuit to obtain a clean DS2 or E2 signal and reference clock. The analog multiplexer retransmits to the clock recovery circuit either the received optical signal or the transmit signal during DS2 or E2 loopback mode. The laser optical output power is -10dBm, and the receiver system is capable of recovering the signal to -30dBm.

The ports shown below in Figure 13-1show the two ports on the rear of the box, with the dust caps removed from OWAN port, ready for optical connectors.

Figure 13-1.Optional Redundant OWAN Port

13.2.2 OWAN Alarms

The OWAN port detects and reports the following alarms:

•LOS (Loss of Signal) An LOS alarm will be declared after 100 microseconds after the received optical signal level drops below the operational threshold.

•OOF (Out Of Frame) Activated by the loss of frame synchronization.

•EQ FAIL (Optical Transmitter Alarm) Activated when the Laser Diode current exceeds the threshold, or when optical power level is below the minimum threshold.

•CLK REC (Clock Recovery Loss of Signal)

•OPT LOS (Optical Loss of Signal) Raised when the Optical receiver fails to detect a signal

•OPT AIS (Optical Alarm Indication Signal) Raised when the Optical unit receives an Alarm Indication Signal from the far end.

13-2 OWAN Ports