An elevator communication system, comprising: an elevator controller ; at least one multi-drop ethernet bus segment reachable by the elevator controller ; a plurality of elevator system nodes (104A-140C, 106A-106C, 126A-126C, 120A-120F, 130A-130C, 132A-132C, 138A-138C, 140A-140C, 148A-148C, 150A-150I) connected to the at least one multi-drop ethernet bus segment and configured to communicate via the at least one multi-drop ethernet bus segment (108A, 108B, 108C, 134A, 134B, 142A, 142B, 146, 156, 168, 168A-168C), wherein the elevator controller is reachable by the elevator system nodes (104A-104C, 106A-106C, 120A-120F, 126A-126C, 130A-130C, 132A-132C, 138A-138C, 140A-140C, 148A-148C, 150A-150I, 164A-164D, 170A-170D, 172A-172D) via the at least one multi-drop ethernet bus segment (108A, 108B, 108C, 134A, 134B, 142A, 142B, 146, 156, 168, 168A-168C) ; characterized in that the elevator communication system further comprises at least one point-to-point ethernet bus and at least one connecting unit , wherein the at least one connecting unit comprises a first port connected to a multi-drop ethernet bus of the at least one multi-drop ethernet bus segment (108A, 108B, 108C, 134A, 134B, 142A, 142B, 146, 156, 168, 168A-168C) and a second port connected to a point-to-point ethernet bus of the at least one point-to-point ethernet bus ; wherein the at least one point-to-point-ethernet bus comprises a first point-to-point-ethernet bus towards an elevator car and the at least one multi-drop ethernet bus segment (108A, 108B, 108C, 134A, 134B, 142A, 142B, 146, 156, 168, 168A-168C) comprises an elevator car segment , wherein a connecting unit disposed in the elevator car comprises a first port connected to the elevator car segment and a second port connected to the first point-to-point ethernet bus ; wherein the first point-to-point-ethernet bus is located in the travelling cable of the elevator car . an elevator controller ; at least one multi-drop ethernet bus segment reachable by the elevator controller ; a plurality of elevator system nodes (104A-140C, 106A-106C, 126A-126C, 120A-120F, 130A-130C, 132A-132C, 138A-138C, 140A-140C, 148A-148C, 150A-150I) connected to the at least one multi-drop ethernet bus segment and configured to communicate via the at least one multi-drop ethernet bus segment (108A, 108B, 108C, 134A, 134B, 142A, 142B, 146, 156, 168, 168A-168C), wherein the elevator controller is reachable by the elevator system nodes (104A-104C, 106A-106C, 120A-120F, 126A-126C, 130A-130C, 132A-132C, 138A-138C, 140A-140C, 148A-148C, 150A-150I, 164A-164D, 170A-170D, 172A-172D) via the at least one multi-drop ethernet bus segment (108A, 108B, 108C, 134A, 134B, 142A, 142B, 146, 156, 168, 168A-168C) ; characterized in that the elevator communication system further comprises at least one point-to-point ethernet bus and at least one connecting unit , wherein the at least one connecting unit comprises a first port connected to a multi-drop ethernet bus of the at least one multi-drop ethernet bus segment (108A, 108B, 108C, 134A, 134B, 142A, 142B, 146, 156, 168, 168A-168C) and a second port connected to a point-to-point ethernet bus of the at least one point-to-point ethernet bus ; wherein the at least one point-to-point-ethernet bus comprises a first point-to-point-ethernet bus towards an elevator car and the at least one multi-drop ethernet bus segment (108A, 108B, 108C, 134A, 134B, 142A, 142B, 146, 156, 168, 168A-168C) comprises an elevator car segment , wherein a connecting unit disposed in the elevator car comprises a first port connected to the elevator car segment and a second port connected to the first point-to-point ethernet bus ; wherein the first point-to-point-ethernet bus is located in the travelling cable of the elevator car . <EOS>