Chapter 4: Diagnosing faults 217Meridian Link Release 5C/CCR Release 3C Diagnostic and Maintenance GuideX.25 host computer link (Link 1) will not establishThis section applies to Meridian Link only.The following section describes the steps to take if the X.25 Host Linkbetween the host computer and the Application Module or IPE Moduledoes not establish.1 Check link status from the Meridian Link.• Log in as mlusr. If unable to log in, see “Login failure.”• Check the status of the link.mlusr> status link 1If the response is “Link 1 : Up”, the Host Link is properly connectedand the problem is not the Host Link connectivity. Make sure the hostapplication has properly registered (see “Application registrationfails”).If the response is “Link 1 : Disabled”, enable the link.mlusr> enable link 1If the response is “Link 1 : Enabled but down”, the Host Link isproperly enabled, but there is something wrong on the host side: eitherlink 1 parameters do not match the host, or the host is down.If the response is anything other than what is indicated above, or thereis no response at all, restart the application.2 Check the Host Link cable.Use a straight-through RS-232 cable between the host computer and• the Host Link port on the IPE Module octopus cable• card 1 conn 2 on the generic I/O panel, Host on the universal I/Opanel, or J3 on the I/O subpanel of the Application ModulePins 2–8, 15, 17, and 20 are used.
