When an occasional all zero condition is reported, the SSC/MAC should dispatch SSIM/I&M to routine equipment on a "chronic" troublesweep.
The PSAPs are instructed to report incidental ANI failures to the BOC on a PSAP inquiry trouble ticket (paper) that is sent to the Customer Services E911 group and forwarded to E911 center when required. This usually involves only a particular telephone number and is not a condition that would require a report to the SSC/MAC. Multiple ANI failures which our from the same end office (XX denotes end office), indicate a hard trouble condition may exist in the end office or end office tandem trunks. The PSAP will report this type of condition to the SSC/MAC and the SSC/MAC should refer the report to the SCC responsible for the tandem office. NOTE: XX is the ESCO (Emergency Service Number) associated with the incoming 911 trunks into the tandem. It is important that the C/MAC tell the SCC what is displayed at the PSAP (i.e. 911-0011) which indicates to the SCC which end office is in trouble.
Note: It is essential that the PSAP fill out inquiry form on every ANI failure.
The PSAP will report a trouble any time an address is not received on an address display (screen blank) E911 call. (If a record is not in the 911 data base or an ANI failure is encountered, the screen will provide a display noticing such condition). The SSC/MAC should verify with the PSAP whether the NO ALI condition is on one screen or all screens.
When the condition is on one screen (other screens receive ALI information) the SSC/MAC will request SSIM/I&M to dispatch.
If no screens are receiving ALI information, there is usually a circuit trouble between the PSAP and the Host computer. The SSC/MAC should test the trouble and refer for restoral.
Note: If the SSC/MAC receives calls from multiple PSAP's, all of which are receiving NO ALI, there is a problem with the Node or Node to Host circuits or the Host computer itself. Before referring the trouble the SSC/MAC should call the MMOC to inquire if the Node or Host is in trouble.
Alarm conditions on the ANI controller digital display at the PSAP are to be reported by the PSAP's. These alarms can indicate various trouble conditions so the SSC/MAC should ask the PSAP if any portion of the E911 system is not functioning properly.
The SSC/MAC should verify with the PSAP attendant that the equipment's primary function is answering E911 calls. If it is, the SSC/MAC should request a dispatch SSIM/I&M. If the equipment is not primarily used for E911, then the SSC/MAC should advise PSAP to contact their CPE vendor.
Note: These troubles can be quite confusing when the PSAP has vendor equipment mixed in with equipment that the BOC maintains. The Marketing representative should provide the SSC/MAC information concerning any unusual or exception items where the PSAP should contact their vendor. This information should be included in the PSAP profile sheets.