Development Funds. The network plan presented in the paper contains both topological structure of fiber optic network as well as the active equipment for the network. In the project described in the paper it has been suggested to use Modular Cable System - MCS for passive infrastructure and Metro Ethernet technology for active equipment. The presented solution provides low cost of construction (CAPEX), ease of implementation of the network and low operating cost (OPEX). Moreover the parameters of installed Metro Ethernet switches in the network guarantee the scalability of the network for at least 10 years.

UTP, and the N2R which were studied at AAU. From here the universities have collaborated intensely, and studied a number of alternatives and variations of the original topologies, based on methodologies developed both independently and jointly over time. This paper gives an overview of the work done, and provides appropriate references to the work for further details. The paper is presented as a tribute to Professor and Dean Antoni Zabłudowski who passed away during 2012.

emission and small memory capacity while ensuring the high reliability. To perform this analysis the elements of graph theory were used.

tego protokołu ze względu na niską jego emisyjność i niewielką pojemność zastosowanych pamięci przy równoczesnym zachowaniu odpowiedniej niezawodności. W celu dokonania tej analizy wykorzystano elementy teorii grafów.

government institutions and the incumbent operator, which makes the Danish FTTH evolution quite unique. In this paper we analyze the Danish FTTH deployment, and highlight some of the main drivers and challenges. A main conclusion is that FTTH can actually be deployed, even in rural areas. On the other hand the fast development in Denmark would probably not have happened without the special organization of electricity companies, and the traditions of these. In addition to technical challenges, ranging from system integration problems to handling of the physical fibers, it has been a significant challenge to actually attract customers: The development of speed and availability of xDSL solutions has increased the need for "killer" applications which take full advantage of the speeds offered by FTTH. The main contribution of this short paper is the analysis of the Danish FTTH experiences, which is valuable when developing technologies and services for FTTH, or when taking initiatives for supporting FTTH deployment in other countries.

In the first part of paper, formulas for the basic parameters diameter and average path length were derived using optimal/ideal graphs, and used for indicating transmission properties of the structures. These analytical results were confirmed by comparison to a large number of computations on real graphs. In the second part, these parameters were compared to the parameters of standard topologies, showing that the distances are shorter when having two different chord lengths.