Showing papers on "Transmission delay published in 1973"

Digitally variable delay time system

Abstract: A system for providing a digitally variable delay time for electrical signals utilizes a connection of multiple delay line sections each of which contributes to the overall system delay time. Each delay line section comprises first and second selectable transmission lines having different electrical lengths and a different magnitude of attenuation per unit length.

An analysis of traffic handling capacity of packet switched and circuit switched networks

Abstract: This paper reports the results of a study on traffic handling capacity of switching nodes and transmission lines in the circuit and packet switched networks, and on cost evaluation methods for the two types of networks.The two types of networks were compared by setting various parameters, including the communication density defined in the paper. The comparison results show that there are application regions favorable for each type of network.

Packet arrival and buffer statistics in a packet switching node

Abstract: Packet multiplexing or switching systems split incoming customer messages into fixed length packets. Within a packet switching system information is transferred packet by packet. In this paper a model for a packet switching node is investigated. Terminals are connected to the node by local loops. In the model incoming messages are quantized into packets and completed packets are transferred to the desired outgoing trunk. Buffering techniques are applied to obtain high trunk utilization. In the model each trunk has a dedicated buffer which stores packets queueing up for transmission. First the statistics of packet arrival at a trunk buffer is analyzed by investigating the process of quantizing messages which arrive dispersed and overlapping in time. Then buffer requirements and overflow probabilities are derived as a function of local loop and trunk speeds and for various packet sizes.

Data communication by packet switching

Abstract: Data communication is a vital part of any industrialised society, and much effort goes into optimising the use of the available resources. One way is to let the customer lease only the transmission channel and provide his own switching. A development of packet switching is discussed in this article.

On the packet interleaved interface between packet switched network and computers

Abstract: This paper describes a study of transmission control procedure for computer to computer and computer to terminal communication through a public packet switched network.Four types of basic data link are defined over a packet travel path in the network, and the functions required for the data link are discussed.By applying the result of the discussion and introducing the concept of a process number, a transmission control method and call control signalling method between computer and packet switched network are proposed for the packet interleaved communication on the basis of the HDLC procedure.

Electronically controllable time delay circuits

Abstract: Time delay devices disclosed herein include first and second dispersive delay lines intercoupled to provide "flat" time delay of signals processed therethrough; with the value of the time delay being selectable by means for controlling the carrier frequency of the signals. In one disclosed embodiment a time delay controller circuit, incorporating an electronically variable time delay device mechanized in a feedback control loop arrangement, provides a reduction in time jitter between successive signal groups; and another embodiment utilizes a variable time delay device in a precision large deviation, wide bandwidth phase modulator configuration.

Traffic considerations in switched data networks

Abstract: Based on a model for the data traffic between major Canadian cities, different types of switched networks are compared chiefly on the basis of channel miles. Circuit switched, packet switched and combined circuit/packet switched networks are compared. Attention is given to the internodal grade of service and the significant network design parameters such as the distribution of message lengths and the selection of packet sizes. Different network topologies, with fixed routing strategies, are analyzed.