Optical connecting system for connecting a first and a second optical device, the optical connecting system comprising (a) a first and a second multi-fiber device connector comprised in the first and second optical device , respectively, and (b) a multi-fiber optical connection cable comprising a plurality of optical fibers and having a first and a second multi-fiber cable connector at a respective first and second end thereof and being adapted to be connected to the first and second multi-fiber device connector , (c) wherein the first and second optical devices are configured to transmit to and/or receive from the respective other optical device one or more wanted optical data signals via selected optical fibers of the multi-fiber optical connection cable , characterized in (d) that the first optical device is configured to supply a first optical connection signal (S c ) to a transmit control port of the first multi-fiber device connector and (e) that the second optical device is configured to receive the first optical connection signal (S c ) that is transmitted through a respective optical fiber of the multi-fiber optical connection cable to a receive control port of the second multi-fiber device connector , (f) wherein no wanted optical data signal is transmitted over the optical path that guides the first optical connection signal (S c ), and (g) that the second optical device is configured to detect whether the first optical connection signal (S c ) received matches one or more predetermined criteria, wherein the second optical device is configured to assume a correct connection to the first optical device via the multi-fiber optical connection cable if the one or more predetermined criteria are matched. (a) a first and a second multi-fiber device connector comprised in the first and second optical device , respectively, and (b) a multi-fiber optical connection cable comprising a plurality of optical fibers and having a first and a second multi-fiber cable connector at a respective first and second end thereof and being adapted to be connected to the first and second multi-fiber device connector , (c) wherein the first and second optical devices are configured to transmit to and/or receive from the respective other optical device one or more wanted optical data signals via selected optical fibers of the multi-fiber optical connection cable , characterized in (d) that the first optical device is configured to supply a first optical connection signal (S c ) to a transmit control port of the first multi-fiber device connector and (e) that the second optical device is configured to receive the first optical connection signal (S c ) that is transmitted through a respective optical fiber of the multi-fiber optical connection cable to a receive control port of the second multi-fiber device connector , (f) wherein no wanted optical data signal is transmitted over the optical path that guides the first optical connection signal (S c ), and (g) that the second optical device is configured to detect whether the first optical connection signal (S c ) received matches one or more predetermined criteria, wherein the second optical device is configured to assume a correct connection to the first optical device via the multi-fiber optical connection cable if the one or more predetermined criteria are matched. <EOS>