Topic
Remote concentrator
About: Remote concentrator is a research topic. Over the lifetime, 25 publications have been published within this topic receiving 375 citations.
Papers
Patent•
21 May 1985
TL;DR: In this paper, a multidrop network for effecting communications between a master site and a plurality of remote slave sites employs a multiport multiplexer at both master and slave sites, for interfacing multiple ports to a single telephone communication link.
Abstract: A multidrop network for effecting communications between a master site and a plurality of remote slave sites employs a multiport multiplexer at the master site and at slave sites, for interfacing multiple ports to a single telephone communication link. At the master site multiple/diverse types of data/signal processing equipments are coupled to respective ports of a master communications multiplexer or concentrator. Under internal processor control the master concentrator interfaces one of its input ports to an associated communications modem by way of which messages are exchanged over the telephone link. That input port of the master concentrator which is interfaced to its associated modem establishes a corresponding destination port of each remote concentrator that is coupled to a respective drop distributed along the telephone link. Interleaved between successive message (data) packets that are transmitted from the master site to addressed devices at remote sites are polling frames assembled by the master site concentrator which sequentially and periodically interrogate the respective ports of all remote concentrators for reply messages to be transmitted to master site terminal equipments which had previously sent requests for data.
77 citations
TL;DR: An effective solution procedure that makes the use of this relaxation of the problem is developed and is found to be significantly faster than a state-of-the-art commercial integer programming package.
Abstract: A model is developed that assigns primary and secondary (backup) concentrator coverage to each terminal site. The objective is to minimize communications costs as well as costs for setting up and operating the concentrators subject to capacity constraints. A relaxation of the problem is studied, and an effective solution procedure that makes the use of this relaxation is developed. Experimental results over a wide range of problem structures show that this solution procedure is very effective. It is also found to be significantly faster than a state-of-the-art commercial integer programming package. >
59 citations
TL;DR: The approach achieves high throughput by reusing the same channels, that collectively occupy a tiny fraction of the optical band, among all interconnecting links and, with the exception of large-dimensional switch arrays, employs readily available technology.
Abstract: The technical feasibility of a lightwave communication system capable of providing service to thousands of subscribers within cities or large suburban areas is examined. Each subscriber in this system has available upon demand an aggregate bit rate of up to 100 Mb/s. The aggregate bit rate of the entire network is on the order of 5 Tb/s. The network topology is that of a star-on-star wherein each subscriber line terminates on one of a multitude of remote concentrators. Each high-speed link from a remote concentrator to a centrally located time-multiplexing photonic switch consists of a single-mode fiber carrying several wavelength-division multiplexed (WDM) channels. Each channel operates in a time-division multiplexed (TDM) mode at a data rate of 2 Gb/s and is powered by a multimode laser. No regeneration is required at the central switch, and at the remote concentrators, each channel is terminated by a direct-detection receiver. The approach achieves high throughput by reusing the same channels, that collectively occupy a tiny fraction of the optical band, among all interconnecting links and, with the exception of large-dimensional switch arrays, employs readily available technology. >
26 citations
TL;DR: The photonic knockout switch as discussed by the authors uses two types of WDM switching: broadcast-and-select (B and S) switching and wavelength routing, which reduces the number of optical gates and wavelength routers.
Abstract: This paper proposes the photonic knockout switch that uses wavelength division multiplexing (WDM). The proposed switch uses two types of WDM switching: broadcast-and-select (B and S) switching and wavelength routing. To extend the size of the knockout switch concentrator, a multi-output-port wavelength-channel selector is used, which enables us to reduce the number of optical gates and wavelength routers. Simple and distributed contention control becomes possible in the optical domain through the use of the wavelength-routing switch. In this switch, coherent crosstalk is a serious problem. We measured the bit error rates of a four-output-port wavelength-channel selector. The power penalty due to the presence of coherent crosstalk is less than 1 dB.
26 citations
Patent•
21 Oct 1986TL;DR: In this article, a base station in a subscriber communication network for communicating signals between subscriber stations and an external communication network having a plurality of ports is defined, and an exchange for connecting the communication circuit to the external communication networks ports is discussed.
Abstract: A base station in a subscriber communication network for communicating signals between subscriber stations and an external communication network having a plurality of ports. The base station includes a communication circuit for enabling simultaneous communications between a plurality of the ports and a plurality of subscriber stations over a given communication channel having multiple sequentially repetitive time slots; a remote-connection processor for directing communications between the time slot assigned to a given subscriber station and a given external communication network port; and an exchange for connecting the communication circuit to the external communication network ports. The exchange includes a central concentrator for directing signals from predetermined external network ports to predetermined sequentially repetitive time slots in a bit stream generated by the central concentrator, and for directing signals to predetermined external network ports from predetermined sequentially repetitive time slots in a bit stream received by the central concentrator; and the remote-connection processor directs signal transfer between given sequentially repetitive time slots of the bit streams and given sequentially repetitive time slots of the communication channel. The remote-connection processor includes a remote concentrator for directing signals from predetermined remote ports to predetermined sequentially repetitive time slots in a bit stream generated by the remote concentrator and transmitted to the central concentrator, and for directing signals to predetermined remote ports from predetermined sequentially repetitive time slots in the bit stream generated by the central concentrator.
15 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2020 | 1 |
| 2018 | 1 |
| 2014 | 1 |
| 2012 | 2 |
| 2011 | 1 |
| 2004 | 1 |