In collaboration with IST company we started project for synchronization signals wander level monitoring within digital telecommunication networks for ITU-T G.823 compliance testing.

The general approach to the wander level monitoring is the next. The WMS-8 system consists of the WMS-8 server (hardware and software), probe units, installed directly at the sites where the monitoring is necessary, and the WMS-8 client software. WMS-8 server and probe units should be connected to the same IP-network (typically to the corporative Ethernet LAN). Standard PCs with the WMS-8 client installed at should be connected to the server through the same or other LAN.

The monitored signal's TIE (defined in ITU-T G.810) data is continuously measured and saved in the system database. The default TIE sampling interval is 1 s. The WMS-8 server calculates MTIE and TDEV for each monitored object every pre-set time period (1 min by default), using the TIE data massive for the last measurement interval (10 000 s by default). When calculated, the MTIE and TDEV values are compared with the pre-selected G.823 or customer masks. This calculation and comparison is called in the WMS-8 system as a background wander monitoring. The background monitoring mode starts automatically after the server turns on and is considered as the main WMS-8 mode of operation.

WMS-8 wander level alarming is also based on the background monitoring data. Minor alarms for MTIE and TDEV are generated if the calculated values reach the 90% of the mask level, Major Alarms — if the MTIE or TDEV values cross the mask line.

Another monitoring mode is the Query Mode (can be called also as Manual Mode). It operates from time to time according to a WMS-8 user manual data request from the Wander Viewer WMS-8 software form. It's useful if the system operator needs to get some additional wander level information (e.g. for a network fault analysis) for any object and any time interval in the past, selected during the querying process. This mode is described in User Manual Wander Viewer topic.

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