Performance Analysis of the D Channel Access Control Scheme in the ISDN Basic User/Network Interface

Shimpei YAGYU  Hideaki TAKAGI  

IEICE TRANSACTIONS on Communications   Vol.E82-B   No.4   pp.575-585
Publication Date: 1999/04/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Communication Networks and Services
N-ISDN,  D-channel,  performance evaluation,  queues,  

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In the basic user/network interface of ISDN (ITU-T Recommendation I. 430), the D-channel is shared by up to 8 terminals for signal and data packets. An analytical model is proposed to reveal the performance characteristics of the access control scheme for the D-channel. Numerical and simulation results are shown to demonstrate the performance differentiation of the terminals with different priorities. It is observed that the mean signal delay at low load may become large because of long service time for packets, and that the priority mechanism may not work properly when the loads at terminals are very asymmetric.