{"type":"doc","content":[{"type":"extension","attrs":{"layout":"default","extensionType":"com.atlassian.confluence.macro.core","extensionKey":"toc","parameters":{"macroParams":{"minLevel":{"value":"1"},"maxLevel":{"value":"6"},"outline":{"value":"false"},"style":{"value":"none"},"type":{"value":"list"},"printable":{"value":"false"}},"macroMetadata":{"macroId":{"value":"f5d89204-9917-4ee1-b53e-cd33da24865e"},"schemaVersion":{"value":"1"},"title":"Table of Contents"}},"localId":"36a70474-4008-495d-bff9-4de3f1f9e8a3"}},{"type":"heading","attrs":{"level":2},"content":[{"text":"Introduction","type":"text","marks":[{"type":"strong"}]}]},{"type":"paragraph","content":[{"text":"Automatic Congestion Control (ACC) is a mechanism by which NSG (SS7 node) can inform to its peer that it is in congested state(i,e, NSG is overloaded) and its peer should control the traffic load or vice-versa.","type":"text"}]},{"type":"paragraph","content":[{"text":"Two levels of congestion are distinguished, a less severe congestion threshold (congestion level 1) and a more severe congestion threshold (congestion level 2). If either of the two congestion levels is reached, an automatic congestion control information message is sent to its peer indicating the level of congestion (congestion level 1 or 2). Peer when receive an automatic congestion control information message, should reduce their traffic to the overload affected exchange.","type":"text"}]},{"type":"paragraph","content":[{"text":"The automatic congestion control information message is sent by NSG after receiving the clear-forward signal and before sending the release-guard signal for a circuit. If the overloaded exchange returns to normal traffic load, no more automatic congestion control information messages are sent. The peers then, after a predetermined time, automatically return to their normal status.","type":"text"}]},{"type":"paragraph","content":[{"text":" ","type":"text"}]},{"type":"heading","attrs":{"level":2},"content":[{"text":"Configuration","type":"text","marks":[{"type":"strong"}]}]},{"type":"paragraph","content":[{"text":"Automatic Congestion Control can be configured via NSG WebGUI using below steps:","type":"text"}]},{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"text":"Configure Automatic Congestion Control parameters as present in General option of Configuration section under Gateway heading as explained in the below link:","type":"text"},{"type":"hardBreak"},{"text":"NSG General Automatic Congestion Control Config","type":"text","marks":[{"type":"strong"},{"type":"link","attrs":{"href":"https://sangomakb.atlassian.net/wiki/spaces/NSG/pages/60522827"}}]}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"text":"Once above step is done goto Route Management Section of TDM configuration (NSG-GUI -> Configuration -> TDM) and then configure below parameters : ","type":"text"}]},{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"text":"Average Call Rate Timer ","type":"text"}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"text":"T29 Timer","type":"text"}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"text":"T30 Timer","type":"text"},{"type":"hardBreak"}]},{"type":"mediaSingle","attrs":{"layout":"align-start","width":65.0},"content":[{"type":"media","attrs":{"width":468,"id":"843a893f-bc1f-4d67-baee-05087d74c6b2","collection":"contentId-60522827","type":"file","height":291}}]}]}]}]}]},{"type":"paragraph","content":[{"text":"Then carry on with your SS7 configuration. Once configuration is done goto Apply as present within Configuration section under Management heading and click on Generate Configuration/Generate and Start Gateway.","type":"text"}]},{"type":"paragraph","content":[{"text":"There are several parameters that needs to be configured for Automatic Congestion Control feature. ","type":"text"}]},{"type":"heading","attrs":{"level":3},"content":[{"text":"Parameters Description","type":"text","marks":[{"type":"strong"}]}]},{"type":"paragraph","content":[{"text":"Given below the parameters with their default values and description: ","type":"text"}]},{"type":"table","attrs":{"layout":"default","width":1800.0,"localId":"f351a267-6deb-4161-a239-c01627ee63d6"},"content":[{"type":"tableRow","content":[{"type":"tableCell","attrs":{"colspan":1,"background":"#f4f5f7","rowspan":1,"colwidth":[239.0]},"content":[{"type":"paragraph","marks":[{"type":"alignment","attrs":{"align":"center"}}],"content":[{"text":"Parameters","type":"text","marks":[{"type":"strong"}]}]}]},{"type":"tableCell","attrs":{"colspan":1,"background":"#f4f5f7","rowspan":1,"colwidth":[702.0]},"content":[{"type":"paragraph","marks":[{"type":"alignment","attrs":{"align":"center"}}],"content":[{"text":"Description","type":"text","marks":[{"type":"strong"}]}]}]},{"type":"tableCell","attrs":{"colspan":1,"background":"#f4f5f7","rowspan":1,"colwidth":[458.0]},"content":[{"type":"paragraph","marks":[{"type":"alignment","attrs":{"align":"center"}}],"content":[{"text":"Allowed Values","type":"text","marks":[{"type":"strong"}]}]}]},{"type":"tableCell","attrs":{"colspan":1,"background":"#f4f5f7","rowspan":1,"colwidth":[213.0]},"content":[{"type":"paragraph","marks":[{"type":"alignment","attrs":{"align":"center"}}],"content":[{"text":"Default Values","type":"text","marks":[{"type":"strong"}]}]}]},{"type":"tableCell","attrs":{"colspan":1,"background":"#f4f5f7","rowspan":1,"colwidth":[187.0]},"content":[{"type":"paragraph","marks":[{"type":"alignment","attrs":{"align":"center"}}],"content":[{"text":"Expected/Tested Value","type":"text","marks":[{"type":"strong"}]}]}]}]},{"type":"tableRow","content":[{"type":"tableCell","attrs":{"colspan":1,"rowspan":1,"colwidth":[239.0]},"content":[{"type":"paragraph","marks":[{"type":"alignment","attrs":{"align":"center"}}],"content":[{"type":"hardBreak"},{"type":"hardBreak"},{"text":"auto-congestion-control","type":"text"}]}]},{"type":"tableCell","attrs":{"colspan":1,"rowspan":1,"colwidth":[702.0]},"content":[{"type":"paragraph","marks":[{"type":"alignment","attrs":{"align":"center"}}],"content":[{"text":"This parameter is responsible for enabling or disabling Automation Congestion Control feature in NSG","type":"text"}]}]},{"type":"tableCell","attrs":{"colspan":1,"rowspan":1,"colwidth":[458.0]},"content":[{"type":"paragraph","marks":[{"type":"alignment","attrs":{"align":"center"}}],"content":[{"type":"hardBreak"},{"type":"hardBreak"},{"text":"Depends upon customer","type":"text"}]}]},{"type":"tableCell","attrs":{"colspan":1,"rowspan":1,"colwidth":[213.0]},"content":[{"type":"paragraph","marks":[{"type":"alignment","attrs":{"align":"center"}}],"content":[{"type":"hardBreak"},{"type":"hardBreak"},{"text":"By default is disabled i.e. 0","type":"text"}]}]},{"type":"tableCell","attrs":{"colspan":1,"rowspan":1,"colwidth":[187.0]},"content":[{"type":"paragraph","marks":[{"type":"alignment","attrs":{"align":"center"}}],"content":[{"type":"hardBreak"},{"type":"hardBreak"},{"text":"1","type":"text"}]}]}]},{"type":"tableRow","content":[{"type":"tableCell","attrs":{"colspan":1,"rowspan":1,"colwidth":[239.0]},"content":[{"type":"paragraph","marks":[{"type":"alignment","attrs":{"align":"center"}}],"content":[{"type":"hardBreak"},{"type":"hardBreak"},{"text":"T29 timer (in ms)","type":"text"}]}]},{"type":"tableCell","attrs":{"colspan":1,"rowspan":2,"colwidth":[702.0]},"content":[{"type":"paragraph","marks":[{"type":"alignment","attrs":{"align":"center"}}]},{"type":"paragraph","marks":[{"type":"alignment","attrs":{"align":"center"}}],"content":[{"text":"These parameters are responsible for release of traffic during remote congestion. These timers are also responsible for determining congestion level at remote exchange","type":"text"}]},{"type":"paragraph","marks":[{"type":"alignment","attrs":{"align":"center"}}],"content":[{"text":" 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parameter determines the rate with which traffic is continuously decremented if REL with ACL level 1 is received (at end/DPC which is already marked at ACL level 1) after T29 timers get expired but T30 timer still running","type":"text"}]}]},{"type":"tableCell","attrs":{"colspan":1,"rowspan":1,"colwidth":[458.0]},"content":[{"type":"paragraph","marks":[{"type":"alignment","attrs":{"align":"center"}}],"content":[{"text":"Depends up on cutomer","type":"text"},{"type":"hardBreak"},{"text":"(must be greater than 0 and less tha call control rate at congestion level 1)","type":"text"}]}]},{"type":"tableCell","attrs":{"colspan":1,"rowspan":1,"colwidth":[213.0]},"content":[{"type":"paragraph","marks":[{"type":"alignment","attrs":{"align":"center"}}],"content":[{"type":"hardBreak"},{"text":"10 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","type":"text"}]},{"type":"panel","attrs":{"panelType":"info"},"content":[{"type":"paragraph","content":[{"text":"NOTE","type":"text","marks":[{"type":"strong"}]},{"text":": 'max_cpu_usage' parameter depends upon 'cpu_monitor' flag which needs to be configured by user in /usr/local/nsg/conf/freetdm.conf as shown below:","type":"text"}]}]},{"type":"paragraph","content":[{"text":"[general]","type":"text"},{"type":"hardBreak"},{"text":"cpu_monitor=yes","type":"text","marks":[{"type":"textColor","attrs":{"color":"#993300"}}]},{"type":"hardBreak"},{"text":"cpu_alarm_action=warn","type":"text"},{"type":"hardBreak"},{"text":"cpu_set_alarm_threshold=92","type":"text"},{"type":"hardBreak"},{"text":"cpu_clear_alarm_threshold=82","type":"text"}]},{"type":"paragraph","content":[{"text":" All these parameters needs to be configured in freetdm.conf.xml which is located at usr/local/nsg/conf/autoload_configs/.","type":"text"}]},{"type":"paragraph","content":[{"text":"Below is sample file illustrating how these parameters can be configured.","type":"text"}]},{"type":"paragraph","content":[{"text":" ","type":"text"},{"type":"hardBreak"},{"text":" ","type":"text"},{"type":"hardBreak"},{"text":" ","type":"text"},{"type":"hardBreak"},{"text":" ","type":"text","marks":[{"type":"textColor","attrs":{"color":"#993300"}}]},{"type":"hardBreak"},{"text":" ","type":"text","marks":[{"type":"textColor","attrs":{"color":"#993300"}}]},{"type":"hardBreak"},{"text":" ","type":"text","marks":[{"type":"textColor","attrs":{"color":"#993300"}}]},{"type":"hardBreak"},{"text":" ","type":"text","marks":[{"type":"textColor","attrs":{"color":"#993300"}}]},{"type":"hardBreak"},{"text":" ","type":"text","marks":[{"type":"textColor","attrs":{"color":"#993300"}}]},{"type":"hardBreak"},{"text":" 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document","type":"text","marks":[{"type":"link","attrs":{"href":"http://www.ofcom.org.uk/static/archive/oftel/ind_groups/nicc/Public/interconnectstandards/info/nd1115_2001_08.pdf"}}]},{"text":" i.e. PNO-ISC/INFO/015 as described in BT Certification requirement document","type":"text"}]}],"version":1}

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