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Since local area networks (LANs) have become a vital part of the modern computing, a great deal of e#ort bar been devoted to their design, standarization, and implementation. Most of this work has been based on a simple linear bus or ring topology (Ethernet, Token Bus, and Token Ring). However, the linear bus and ring topology networks have sign&ant disadvantages in certain applications.Recently, we proposed a new hybrid architecture local area network, Hybrid-Meshnet.l&e Hybrid-

Abstract. The information of existing smart meter is transmitted by the fixed concentration and scheduling protocol on the request of the server. The connection configuration and the data transfer process are performed by DLMS/COSEM standard protocol. This protocol is applied to only point to point connections between the meter and the metering server. Therefore some constraints of transmission efficiency occur in large-scale networks. In this paper, we suggests an open protocol -Smart Meter Concentration Protocol(SMCP) which provide efficient transmission between concentrator and metering server. The AMI system was implemented with the proposed SMCP and has field tested in Jeju Island.