[drtse4]

What puzzles me is that Georgian Telecom didn't put in place any secondary line/s to provide an alternative path in case of issues on the working path.

Update: Checking Railway Telecom site http://grt.ge/?m=static&s=5 (here for the interactive map: http://grt.ge/?m=static&s=6) looks like it's an optical network based on CWDM equipments with links that provide a bit more than two 10GE between the nodes, definitely not a top-notch network. Automated path protection facilities couldn't even be available for networks of this type.

Update 2: Just noticed that the two bigger 10GE paths create a channel only from Poti to Tbilisi, so bandwidth for communications between internal nodes is provided by the other links (slower optical links and the ethernet ones (copper? hm) shown on the map).