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Research of token ring network options in automation system of marshalling yard

Zhukovytskyy I., Pakhomova V.

Transport Problems

2018

T. 13, z. 2

149--158

In the automation systems of sorting process the use of computer networks of Ethernet technology is possible. But its traditional drawback is a probabilistic nature of the network access, which does not guarantee the information transmission in specified time intervals. However, there are other technologies that are free from this defect, for example, the Token Ring technology. A methodology, for determination of the network parameters in the automation system on marshalling yard at the restriction of the average time for application waiting in the queue at the station network has worked out. Using the token method of access to the ring, the state diagram of network stations was compiled. This is the basis for simulation model of the Token Ring network, which was developed in the GPSS environment. As a result of simulation the dependencies of the maximum queue length at the network station on the frame length, intensity, and distribution of time for application receipt from the station were obtained.

Modyfikacja modelu Webstera przez zastosowanie modelu M/G/1

Sierpiński G.

Zeszyty Naukowe. Transport / Politechnika Śląska

2005

z. 58

359-367

W artykule omówiono model Webstera (1958). Scharakteryzowano poszczególne składniki formuły Webstera. Dokonano modyfikacji tej formuły przez zastosowanie modelu kolejkowego M/G/1. Przedstawiono również dokładny opis modelu M/G/1. Zaproponowana formuła pozwala wyznaczać straty czasu w przypadku dużego zróżnicowania czasów obsługi (dowolny rozkład czasów obsługi).

The article includes a review of the Webster's model (1958). Each element of Webster's formula was described. This formula was modificated by used M/G/1 queueing model. Queueing model M/G/1 was described too. Proposed formula allows to estimate time delay in case of large service times variations (general distribution of service time).