A method implemented in a power source (102, 104, 202) for identifying connection paths between the power source and a plurality of servers (126, 128, 130, 132, 134, 136, 206), each of the plurality of servers being provided with electrical power from the power source via one of a plurality of power distribution units, PDU (142, 144, 204), each of the plurality of PDUs having a power input (142o, 144o, 250) connected to a respective power output (102 a -102 l, 104 a -104 l, 234) of the power source via a respective one of a plurality of cables, the method comprising: sending, from each respective one of the plurality of power outputs of the power source, on each of the plurality of cables, a respective reachability signal comprising an identity of the power source and an identity of the respective one of the plurality of power outputs of the power source; characterized in that the method further comprises: receiving, at the plurality of power outputs of the power source, on the plurality of cables, a plurality of return reachability signals, each return reachability signal: being received at a given one of the plurality of power outputs of the power source, and comprising the identity of the power source, the identity of the given one of the power outputs of the power source, an identity of a given one of the plurality of PDUs that is respective to the given one of the plurality of power outputs of the power source, an identity of the power input of the given one of the plurality of PDUs, an identity of a power output (142 a- 142 l, 144 a -144 l, 254) of the given one of the plurality of PDUs, and an identity of a given one of the plurality of servers provided by the given one of the plurality of servers to the given one of the plurality of PDUs; and for each received return reachability signal, storing, in a database, a respective reference between the identity of the power source, the identity of the given one of the plurality of power outputs of the power source, the identity of the given one of the plurality of PDUs, the identity of the power input of the given one of the plurality of PDUs, the identity of the power output of the given one of the plurality of PDUs, and the identity of the given one of the plurality of servers. receiving, at the plurality of power outputs of the power source, on the plurality of cables, a plurality of return reachability signals, each return reachability signal: being received at a given one of the plurality of power outputs of the power source, and comprising the identity of the power source, the identity of the given one of the power outputs of the power source, an identity of a given one of the plurality of PDUs that is respective to the given one of the plurality of power outputs of the power source, an identity of the power input of the given one of the plurality of PDUs, an identity of a power output (142 a- 142 l, 144 a -144 l, 254) of the given one of the plurality of PDUs, and an identity of a given one of the plurality of servers provided by the given one of the plurality of servers to the given one of the plurality of PDUs; and being received at a given one of the plurality of power outputs of the power source, and comprising the identity of the power source, the identity of the given one of the power outputs of the power source, an identity of a given one of the plurality of PDUs that is respective to the given one of the plurality of power outputs of the power source, an identity of the power input of the given one of the plurality of PDUs, an identity of a power output (142 a- 142 l, 144 a -144 l, 254) of the given one of the plurality of PDUs, and an identity of a given one of the plurality of servers provided by the given one of the plurality of servers to the given one of the plurality of PDUs; and for each received return reachability signal, storing, in a database, a respective reference between the identity of the power source, the identity of the given one of the plurality of power outputs of the power source, the identity of the given one of the plurality of PDUs, the identity of the power input of the given one of the plurality of PDUs, the identity of the power output of the given one of the plurality of PDUs, and the identity of the given one of the plurality of servers.