Communication system, extension station, communication method and communication system making method

A communication system comprising:

• an aggregate station configured to transmit and receive a signal;
• and
• N extension stations (N is an integer of 2 or more),
• wherein the N extension stations include
• a first extension station configured to receive a signal from the aggregate station and transmit a signal to a second extension station;
• an ith extension station (i is an integer satisfying 2≤i≤N−1) configured to receive a signal from an (i−1)th extension station and transmit a signal to an (i+1)th extension station;
• and
• an Nth extension station configured to receive a signal from an (N−1)th extension station, and
• wherein a ratio between a magnitude of a signal to be locally processed by an ith extension station (1≤i≤N−1) and a magnitude of a signal to be transmitted thereby is 1:(N−i).

A communication system making method of setting a ratio between a magnitude of a signal to be transmitted to an extension station and a magnitude of a signal to be processed locally, the communication system making method comprising steps of:

• installing an aggregate station;
• connecting N extension stations (N is an integer of 2 or more) in series with the aggregate station, wherein the extension station includes a splitter configured to branch a received signal into a signal to be processed locally and a signal to be transmitted to another extension station;
• and
• setting a branching ratio of the splitter of each of the N extension stations,
• wherein the step of setting the branching ratio includes setting the branching ratio of an ith extension station (1≤i≤N−1) so that a ratio between the magnitude of the signal to be transmitted and the magnitude of the signal to be processed locally becomes j:1 when the total number of other extension stations connected to a downstream side of the ith extension station is denoted by j.