On a Characteristic of Data Transmission In Bus Network

Abstract

Abstract-Bus network is a primary topology in local area network and the network had a problem of data collision on the bus which influenced the efficiency of data transmission. Recently, using switching-hub that establishes a link from a sending station to a receiving station, the number of data collisions extremely decreased. However, in the case that the data buffer of a receiving station is full or the receiving station is sending or receiving data, a sending station has to wait for sending data. This waiting time (stand-by time) influences an efficiency of data transmission. In this paper, a characteristic of data transmission with the stand-by time in bus network is clarified. Taking note of one station with a sending data buffer, the link probability that the link from the station to a receiving station will be established is defined as constant. The station connected to the bus is modeled as a queue with stand-by time, and then state equations of the probability of the number of waiting data at the ready time of sending are expressed. From the equations, probabilities of the number of waiting data, mean of the number of waiting data in the sending buffer and mean waiting time which is the time from the data arrival time at the sending buffer to the beginning time of sending are derived. The calculated values are illustrated with the link probabilities in several cases, and then the influences of the link probability to data transmission are shown.Index Terms-Bus network, link probability, the number of waiting data, mean waiting time.

On a Characteristic of Data Transmission in Bus Network under Priority Processing with Waiting High Priority Data

“…xx in both sides of equation (1) and transforming into a generating function form, the following equation is obtained.…”

“…In this network, a sending station has to wait for starting to send a datum when the transmission channel is occupied as in the case that the receiving station is sending or receiving a datum or other transmission occupies part of the transmission channel. For analysis of this bus network, I defined a constant link probability that a switching hub establishes a transmission channel, and then I reported a characteristic of data transmission [1], [2].…”

On a Characteristic of Data Transmission with Priority Processing in Bus Network

“…However, the characteristics of data transmission (probabilities of the number of waiting data, mean of the number of waiting data and mean waiting time) were not cleared, so that I reported simulations for a bus network with CSMA/CD [14], [15] and the characteristic of data transmission in bus network with switching hub [16].…”

“…Taking note of one station connected to a bus, for high priority data and low priority data, probabilities of the number of waiting data, mean of the number of waiting data in the sending buffer and mean waiting time from the arrival time at the sending buffer to the beginning time of sending [16]- [18] are derived. Furthermore, some calculated values are illustrated, and then characteristics of data transmission with priority processing are considered.…”

On a Characteristic of Data Transmission with Three or More Priority Levels in Bus Network

“…I already reported a characteristic of data transmission in bus network under the condition that the link probability is defined as a constant [9], [10].…”