Performance analysis of a gateway connecting the CEBus to the ISDN

The performance of a gateway which connects the CEBus to the ISDN has been investigated. The gateway handles three priority class messages for either direction. Message and channel throughputs and packet and message delays have been studied in terms of the offered load for intra-network traffic in the CEBus and inter-network traffic from the CEBus to the ISDN through the gateway. It has been found that the delay for inter-network traffic for any priority level is much higher than that for intra-network traffic. In light traffic load, the delay for the ISDN to the CEBus direction is lower than that for the opposite direction. This was seen to reverse in heavy loads. In addition, significant decline of throughput was found, under the condition of large propagation delay, for all three priorities of inter-network traffic. Under favorable conditions, i.e., for low or zero propagation delay, packet length in the range of 300 to 500 bits, and light traffic, less than 70% of offered load (including inter-network traffic via the gateway), the CEBus-gateway-ISDN system performs satisfactorily.<
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