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Load Study of theAXE 10 Control SystemBerth Eklundh and David RappThe Department of Telecommunication Systems at the Lund Institute ofTechnology in Sweden has, with the support of Ericsson and the SwedishTelecommunications Administration, carried out a study of the traffic capacity ofthe AXE 10 control system with the APZ210 central processor.The authors describe the various methods used and the result of the study.In the analog version of AXE 10 theswitching system consists of link connectedunits. The proper dimensioningof link connected systems has long beenknown, and in this respect systemAXE 10 presents no new problems. Inthe digital version the dimensioning isalso so ample that only routine checkingis necessary.In the AXE 10 system the equivalent ofthe registers and markers in crossbarsystems is a complex of computers, thesystem being stored program controlled.The function of the computers ismore intricate than that of the markers,and the division between different interworkingfunctional units is complex.The available mathematical methodshave not been sufficient. It has beennecessary to develop new methods inorder to be able to solve the problemThese methods will also be useful forother, similar problems.The structure of AXE 10The design and function of AXE 10 hasbeen described previously in several articlesin Ericsson Review 123 . A briefsummary of the function of the controlsystem is given here as a background tothe description of the study that followsAXE 10 is built up in a hierarchic structurewith systems, subsystems, functionalblocks and functional units, fig. 1.The interworking between differentfunctional blocks is by means of signals.When a subfunction is completed in onefunctional block, the block sends signalsto one or more other functionalblocks. This initiatesothersubfunctionsin these blocks, which in their turn sendout new signalsFig. 2 shows a diagram of the structureof system AXE 10 The parts that are ofimportance to the capacity analysis arethe processor system with the centralprocessor, CP, and the regional processors,RP. CP and RP are connectedvia a bus system with separate buses forgroups of RPs. The main work of CPconsists of complex, infrequent tasks,such as number analysis, while RPhandles routine work, e.g. scanning theline circuits.Other units of importance in this connectionare RPH-I and RPH-O. whichFig. 1The functional levels of system AXE 10HardwareRegional software• Central softwareFig. 2The structure of system AXE 10SSSGSSTSSMASIOSRPSRPCPSCPU-ACPU-BPSRSDSRPH-IRPH-0Subscriber switching subsystemGroup switching subsystemTrunk and signalling subsystemMaintenance subsystemInputoutput subsystemRegional processor subsystemRegional processorCentral processor subsystemCentral processing unit ACentral processing unit BProgram storeReference storeData storeUnit for sensing incoming calls from RPUnit for distributing outgoing signals to RP
209BERTH EKLUNDHDAVID RAPPDepartment of Telecommunication SystemsLund Institute of Technology. Swedenhandle the interworking with the regionalprocessors RPH-I scans all RP busescyclically using a polling process, andthe signals stored in RP are transmittedto CP. RPH-0 transmits signals to differentRPs in a corresponding wayThe processors in stored program controlledsystems have different prioritylevels for the jobs they have to perform.Thus certain |obs are allowed to passothers. This method of working complicatesthe calculations of processor capacityIn CP the job management is mainly carriedout by micro programs. An interruptsystem is used which has four programlevels and which includes job buffers forqueue administration, fig.3.The malfunction level. MFL. has top priorityAn interrupt signal isgenerated forMFL when a fault detecting circuit hasfound a hardware fault which must becleared quickly.The normal work of CP is carried out atthe traffic handling level, THL, and at thebasic level, BAL, with sublevelsin accordancewith fig.3. BAL has the lowestpriority. Job management at levels THLand BAL uses the job buffers JBA-JBDfor storing different signal messagesSuch a message contains the receivingblock number and the signal number togetherwith the data being transmitted inthe signal. An interrupt signal is automaticallygenerated when a signal messageis placed in a buffer. Such a signalsent to THL then interrupts work in progressat level BAL If other work is alreadybeing carried out at THL, it mustalways be completed before the next jobcan be started.All signals from RP, and most signalsbetween the CP program blocks aretemporarily stored in the job buffers. Inaddition level THL receives a clock interruptsignal every 10ms so that signalsinaccordance with a job table can be sentto program blocks that measure time.Fig. 3Job management in CPPCU Priority control unitMFL Malfunction levelTRL Tracing levelTHL Traffic handling level with sublevels 1-3BAL Basic level with sublevels 1-2MAU Maintenance unitTRU Tracing unitJBA Job buffer AJBB Job buffer BJBC Job buffer CJBD Job buffer DEES Execution stoppedE
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