Pretences of modern communication networks today are accentuated by the real time transmission necessity of data, voice (VoIP) and video on common network infrastructure.

One of the realization possibilities of the multimedia network services is the assurance of data transfer rate at higher values than the necessary capacity for local applications. Realization of this condition in LAN/MAN environment can be guaranteed relative simply, without strict network resource design. This aspect is exploited by some traders, which make low priced switches with high speed interfaces (1-10 Gigabit/sec) but low intelligence. Such users and network service providers argue with their cost efficient investment in infrastructure development until bottleneck appear in the local network.

Because lot of user nodes with 1 Gigabit/sec interfaces running multimedia network applications (like HD videoconference, etc.) consume more and more network bandwidth, makes necessary QoS service guarantees for core devices. This needs intelligence enough integrated in switches to apply DiffServ/IntServ/RSVP mechanisms in optimum conditions to provide satisfactory network resources for real time traffics. Introduction of MPLS technology inside of autonomous systems with high number of L3 hops can be another solution.

In both cases of company infrastructure development strategies applied needs calculation today of resources utilized by different bit flows. This implies considerations regarding evaluation of statistical aspects (LRD - Long Range Dependency, Self Similarity, Fractals, etc.) of PDU transmission processes and the Corvil bandwidth of different data flows.

In the paper will be presented traits of 10 Gigabit/sec LAN/MAN network (3k nodes) traffics at University of Debrecen. Based on aspects detected by complex mathematical and statistical analysis will be listed characteristically important development directions of this institute LAN/MAN in the middle far time period.