The authors introduce a communication subnet architecture, called Hybrid Meshnet, for local area networks (LANs) that is designed to achieve a high degree of network performance and flexibility. These objectives are a...
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The authors introduce a communication subnet architecture, called Hybrid Meshnet, for local area networks (LANs) that is designed to achieve a high degree of network performance and flexibility. These objectives are achieved by utilizing a dual-channel structure. A token ring is used for short or prioritized data transmissions. A complementary mesh network with arbitrary data links is used for relatively high volume and low-priority data transmission. A distributed networkcontrol and routing mechanism allocates the communicationnetwork nodes. Hybrid Meshnet supports a LAN system in which the communication structure may easily be modified and changed by the insertion or deletion of data links.< >
Developments in image and signal processing have generated the need for a distribution system capable of transferring extremely large files while maintaining acceptable delays for real-time control packets. To fill th...
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Developments in image and signal processing have generated the need for a distribution system capable of transferring extremely large files while maintaining acceptable delays for real-time control packets. To fill this need, IMAGENET has been developed, a local area network (LAN) capable of transferring large data packets, as well as small real-time command messages, over a STAR-configured fiber-optic network. The authors describe the IMAGENET architecture, discuss its advantages over other LAN architectures, and utilize an M/G/1 priority queueing model to demonstrate its performance characteristics.< >
The optical hypergraph is a novel networkarchitecture in which each edge of the hypergraph is a multiple-access broadcast medium constructed as a passive optical star coupler. Access to each net (edge) is time-slotte...
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The optical hypergraph is a novel networkarchitecture in which each edge of the hypergraph is a multiple-access broadcast medium constructed as a passive optical star coupler. Access to each net (edge) is time-slotted, and the system maintains global slot synchronization. The integration of voice into the system is done by reserving time slots in a periodic manner. A packet which contains several voice parcels from different phone conversations is transferred in these slots. These parcels may have different destinations on the optical net. As a result of the global end-to-end synchronization, the delay from the source to the destination is a known constant, with accuracy of plus or minus half a time slot. In the analysis, it is shown that the system improves its operation as the communication bandwidth increases. In other words, the algorithms and protocols improve in performance as the communication bandwidth increases. Two criteria are used to exhibit this phenomenon: (i) the utilization efficiency and (ii) the end-to-end delay.< >
The Intelligent network/2 addresses the goal of quickly introducing new services without having to modify a large number of local switches. Centralizing the call-processing-service control intelligence of this distrib...
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The Intelligent network/2 addresses the goal of quickly introducing new services without having to modify a large number of local switches. Centralizing the call-processing-service control intelligence of this distributed intelligent architecture provides for rapid deployment of new services and encourages customer reconfiguration. To support this environment, the scope of customer service provisioning evolves to encompass all aspects of negotiations, assignment, and installation functions and emphasizes the remote administration of memory updates. Provisioning is characterized by having real-time access to integrated data: being more flexible; less service- and tariff-dependent; and being capable of rapid service request turn around time which is responsive to the customer's needs.< >
A report is presented of a panel investigation into the operational survivability issues which confront military agencies concerned with air and space missions. Topics covered included: the survivability and reliabili...
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A report is presented of a panel investigation into the operational survivability issues which confront military agencies concerned with air and space missions. Topics covered included: the survivability and reliability of critical communications systems with an assessment of whether these systems could support the ITWA (Integrated Threat Warning and Assessment) architecture through all phases of conflict and the survivability of bit-oriented cyclic redundancy-checked standard message sets. It is concluded that without a concerted effort towards developing survivable communications networks and a well-thought-out and -executed plan for attaining each support, the problem of error-filled, low-data-rate traffic overwhelming a stressed, piecemeal transmission architecture which enjoys questionable survivability and connectivity cannot be solved. It is argued that these weaknesses can be minimized by aggressively pursuing the alternatives presented.< >
The authors discuss general requirements for the integrated services digital network (ISDN), functional entities in ISDN, and communication types between entities. The abstract global ISDN networkarchitecture is then...
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The authors discuss general requirements for the integrated services digital network (ISDN), functional entities in ISDN, and communication types between entities. The abstract global ISDN networkarchitecture is then developed by applying four guidelines: data/control separation, basic/advanced services, user/network interdependency, and the layered model. The architecture is composed of three parts: path network, controlnetwork, and service network. Based on this discussion, some recommendations for the system architecture of the individual ISDN system are presented. Also given is a list of other important issues for the architectural design of ISDN systems.
A discussion is presented of the performance congestion control and engineering of common channel signaling (CCS) networks supporting ISDN (integrated services digital network), the performance and congestion control ...
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ISBN:
(纸本)4274031888
A discussion is presented of the performance congestion control and engineering of common channel signaling (CCS) networks supporting ISDN (integrated services digital network), the performance and congestion control of LAPD frame-relay protocols for packetized data transfers over ISDNs, D-channel signaling performance, and switch overload and flow-controlissues. The results include the effect of user-to-user information on D-channel and CCS network performance, engineering for steady-state as well as for signaling link changeover transients, and the transient behavior of CCS congestion control responses. Performance results for a frame-relay implementation of LAPD using a stop-duration congestion control scheme with a randomized duration, are also presented. The author also discusses switch overload controlissues associated with designing the real-time traffic-controlarchitecture for network switches, in an ISDN environment.
The following topics are dealt with: VLSI components and packaging;signal processing;cartographic data uses;data transmission;avionics architecture;fiber optics;information control and display;image processing;airborn...
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The following topics are dealt with: VLSI components and packaging;signal processing;cartographic data uses;data transmission;avionics architecture;fiber optics;information control and display;image processing;airborne radar and fire control;navigation;air data;Kalman filtering;power generation and control;space power;flying qualities;flight management;fault tolerant computer architectures;actuation;flight controlsystems;multivariable control;stability and control methods;F-16 flight test report;Ada/Jovial language and applications;software acquisition;software management;visual systems software;Ada in avionic systems;16/32 bit architectures;human interface and machine systems analysis;pilot acceleration protection;information organization and management;simulation;command, control and communication;space communication;reliability and maintainability;management decision models;electromagnetic compatibility;AI and expert systems implementation and architectures. 219 papers were presented, all of which are published in full in the present proceedings. Abstracts of individual papers can be found under the relevant classification codes in this or other issues.
The principles and the design of global event synchronization in a large area network (about 10,000 nodes within 1000 km**2), are presented and analyzed. The networkarchitecture is a hypergraph, its edges are nets or...
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ISBN:
(纸本)0818608013
The principles and the design of global event synchronization in a large area network (about 10,000 nodes within 1000 km**2), are presented and analyzed. The networkarchitecture is a hypergraph, its edges are nets or buses, and its vertices are nodes. The communication over each net is time-slotted, and the event duration is one time slot. Synchronization among all the system's nets is maintained and, as a result, this distributed system preserves a total ordering of all the events in the system. It is shown that this total ordering is achieved with smallcommunication overhead (less than 5%). Each net is a passive, centralized optical star, with a bandwidth of about 1 Gb/s. The high bandwidth enables a wide multiple-access net;therefore, the dimension of the hypergraph is low. This allows the timing and state information to propagate quickly through the system, and simplifies the distributed switching in the network.
The survivability of communicationsystems has been a longstanding requirement for various command-and-controlsystems. Previous approaches have concentrated on building hardened systems that operate separately from t...
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The survivability of communicationsystems has been a longstanding requirement for various command-and-controlsystems. Previous approaches have concentrated on building hardened systems that operate separately from the normal, day-to-day military communications systems, leaving vulnerable general strategic communications. Since it is impractical to harden allcommunications systems, a methodology has been developed that combines the inherent robustness of packet-switching technology with the diversity of transmission systems and media available to the military. This use of multiple types of transmission media to obtain redundancy and survivability in the face of attack has recently gained increased attention. This paper extends prior work, which concentrated mainly on link issues, by proposing a unified communicationarchitecture for multi-band networking.
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