Cabletron Systems CyberSWITCH CSX150 User Manual

Also see for CyberSWITCH CSX150: User guide Quick start guide

Contents

Small Office Remote Access Switch 311C ONFIGURING C ALL C ONTROLSemipermanent ConnectionsCall RestrictionsYou may wish to disable call restrictions when using semipermanent connections. Call restrictionsare mainly intended for use in areas where “per minute” ISDN tariffs are in place. Typically, thisin not the case if semipermanent connections are in use.If you decide not to disable Call Restrictions, we recommend that you make the following CallRestriction parameter alterations:• Change the maximum call duration to warn only.• Add 1,440 minutes to the Call Minutes per Day for every call in a configured semipermanentconnection.• Add 43,200 minutes to Call Minutes per Month for every call in a configured semipermanentconnection.• Allow calls for all hours in the day.Refer to the instructions for changing the parameter values.Throughput MonitorThe semipermanent connection feature, along with the throughput monitor, interact to prevent theCyberSWITCH from dropping calls which are part of the semipermanent connection.However, specific considerations apply to the use of the Throughput Monitor. Consider these twosituations:1. To connect two systems together with semipermanent connections:For each system, configure a semipermanent connection to the other, and enable ThroughputMonitoring on both.However, you may occasionally see a “glare” condition (i.e., both machines attempting toreestablish the connection after a network or power outage). This “glare” condition will notoccur if the semipermanent connection utilizes the entire bandwidth available at either systemsite. Normal throughput monitoring will drop the extra call if traffic allows.If this glare condition is unacceptable, you may either:• Delete all Dial-Out phone numbers (through CFGEDIT, Device List entries) for one of thesites. The other site (that still has Dial-Out configured) will then create the semipermanentconnection.• Treat one system as a device which does not support semipermanent connections. (Seeitem 2, which follows).2. To connect an system to a machine that does not support semipermanent connections, disableThroughput Monitoring at the remote device.If neither of these options are used, the remote device may periodically drop calls which aremembers of a semipermanent connection. The semipermanent connection feature will stop makingcalls if the number of connections dropped reaches the maximum within configured time limit. Ifthis happens, you will need to use thecall device command to restart the feature.