remote axe 10 subscriber switch in a container an optical fibre line ...

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;2Remote AXE 10 Subscriber Switchin a ContainerBjorn NorevikThe digital subscriber switch in the AXE 10 system can be placed either in theparent exchange or remotely. In the case of remote subscriber switches it canoften be an advantage to have the equipment installed in a container, not only asa temporary solution but also as a more permanent arrangement. A productpackage has therefore been prepared which can be used for remote units ofdifferent sizes up to 2048 subscribers. The product package also includescooling equipment, which can be of the conventional type or a system wherewater is used to remove the surplus heat. The latter system offers standbycooling if there is a mains failure.The author discusses the motives for this type of equipment and what demandscan be made on it, and also describes the equipment included in the productpackage.UDC 621 395 3When planning a new telephone networkor extending an existing one it isnecessary to assess many uncertain factors.However, some basic facts are wellknown. The subscriber network is responsiblefor the greater part of theoverall cost of the telephone network.Thus an extension often requires largeinvestments in the network, particularlyif existing cable routes are already fullyutilized.Consideration must also be paid to increasesin the building costs. Uncertainfactors, e.g. the rate of growth and thedemand for new telephone facilities,necessitate flexibility in the choice ofboth temporary and permanent solutions.A digital remote subscriberswitch-an economicsolutionThe digital subscriber switch in AXE 10has been described in detail in a previousarticle 1 . The article also describedhow the digital subscriber switch couldbe installed remotely from the parent exchange.A remote digital subscriber switch, RSS,constitutes an integral part of an AXE 10exchange, and subscribers connectedto RSS are thus offered exactly the samefacilities as other AXE 10 subscribers.It is economical to connect remote subscriberswitches to their parent exchangesby means of PCM links bothwhen building up new subscriber networksand when extending existingones. In the case of new networks theFig. 1A container in place and connected to the networkin Saudi-Arabia
175BJORN NOREVIKPublic Telecommunications DivisionTeletonaktiebolaget LM Ericssonneed for cables in the primary networkwill be considerably less than if the subscribersare connected directly to theparent exchange, and in the case of extensionslarge investments can also beavoided. This applies especially if thecable routes are already fully utilized,since every PCM link installed frees severalcable pairs.Remote subscriber switchesin containersThe relatively limited physical size ofRSS also makes it possible to install it ina container, fig. 1. This method can beused for subscriber switches with bothtemporary and permanent positions.The equipment can be moved accordingto need.A container is also considerably cheaperthan a conventional exchange building.ApplicationsThe reasons given above make RSS installedin a container particularly suitablefor the following applications.- as a permanent extension to an alreadyfully developed exchangebuilding- as a permanent extension in an existingnetwork, particularly when the existingcable routes are fully exploited- as a semi-permanent or permanentsolution when building up a new subscribernetwork and there is some uncertaintyregarding future developments- as a temporary solution when quickservice is required, i.e. before the exchangebuilding has been completedor in emergency situations when theordinary exchange is out of operationbecause of a fire or for some otherreason.Product packageThe type of container chosen for RSS isan insulated refrigeration container,built to ISO standard dimensions 2 (10 or20 feet long, 9 feet high, 8 feet wide). Theshorter container is used for an RSS forup to 512 subscribers, and the 20-footcontainer for the full 2048-group, fig. 2.Since the container is insulated, thesame type can be used for all installationsregardless of the widely differingenvironments that will be encounteredaround the world, and adaptations tosuit different markets are avoided. Anefficient and reliable cooling systemensures a suitable working environmentfor the telephone equipment inside thecontainer.The container is built to ISO standard 2as regards dimensions and handling facilities.The handling requirements relateto, for example its strength and devicesfor lifting the container. The standarddimensions also facilitate transport(by train, lorry, boat or aricraft),since standardized handling equipment,such as cranes and trucks, can beused. The easy handling and the standardizedconstruction also contributeto speedy installation on site, so that theequipment can be put into operation almostimmediately. If necessary, RSScan also just as easily be moved to a newsite later on, to meet new demands.Since the version of RSS intended forcontainer installation is standardized,all cabling within and between magazinegroups, as well as to the otherFig. 2The layout of a 20-foot container with a remotedigital AXE 10 subscriber switch for 2048 subscribersLSM Line switching modulesLT Line terminal for PCMR Power supply equipmentSTB Signalling terminal equipmentSE Special subscriber equipment tor coin box sets,subscribers' private meters etc.MDF Main distribution trameAC Alternating current connector
Page 1: ERICSSONREVIEW41982REMOTE AXE 10 SU
Page 6 and 7: Fig. 3The container is brought out
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Page 10 and 11: Fig. 3Repeater spacings and hardwar
Page 12 and 13: 182The primary alarms are those rec
Page 14 and 15: 184Technical dataDigital interface
Page 16 and 17: Fig. 2, leftThe transmultiplexer as
Page 18 and 19: 188Fig. 9Synchronization of the tra
Page 20 and 21: Fig. 13The M5/BYB bay equipped with
Page 22 and 23: Fig. 17ZAJ 5x24/2x60, transmultiple
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Page 26 and 27: Fig. 5The central processing unit i
Page 28 and 29: 198Fig. 8The floppy disc unit with
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Page 33 and 34: Local Area Radio System-LARSHans Li
Page 35 and 36: Fig. 5One of the thick film hybrids
Page 37 and 38: 207Technical data for LARSSelective
Page 39 and 40: 209BERTH EKLUNDHDAVID RAPPDepartmen
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Page 43 and 44: 213Models of CPA comparison between
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