An elevator communication system, comprising: an elevator controller; at least one multi-drop ethernet bus segment (108A, 108B, 108C, 134A, 134B, 142A, 142B, 146, 156) 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 (108A, 108B, 108C, 108D, 140A, 140B, 148A, 148B) 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 (110, 122, 136) and at least one connecting unit (102A, 102B, 102C, 102F, 144A, 144B), wherein the at least one connecting unit (102A, 102B, 102C, 102F, 144A, 144B) comprises a first port connected to a multi-drop ethernet bus (108A, 108B, 108C, 142B) 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 (110, 122, 136); wherein the at least one point-to-point-ethernet bus (110, 122, 136) 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 (108A, 108B, 108C, 134A, 134B, 142A, 142B, 146, 156) 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 (108A, 108B, 108C, 108D, 140A, 140B, 148A, 148B) 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 (110, 122, 136) and at least one connecting unit (102A, 102B, 102C, 102F, 144A, 144B), wherein the at least one connecting unit (102A, 102B, 102C, 102F, 144A, 144B) comprises a first port connected to a multi-drop ethernet bus (108A, 108B, 108C, 142B) 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 (110, 122, 136); wherein the at least one point-to-point-ethernet bus (110, 122, 136) 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.