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Explanation: What you cited indicate more than just observation,in the contex ( you posted before) it seems a technical spesifications for a construction contract.
Ýf it is a whole construction, a control tower should be in the context. But that may be a simpler observation post (but used in airplanes according to my dictionary)
or just a control point.
1964 Turkey Local time: 14:51 Native speaker of: Turkish PRO pts in pair: 294
Explanation: From the context, it sounds as though the piece might be describing how to probe a data network, maybe to sort out errors. It is suggesting that the best place to monitor is the port (port de recopie) which relays the traffic from the device you're interested in (port d'observation) to and from the outside world.
Just knowledge of networks - difficult to find these phrases used elsewhere.
Alison Webb France Local time: 12:51 Native speaker of: English PRO pts in pair: 12