22 Chapter 1: Introduction to the EIU297-8991-910 Standard 03.01 August 1999• EIU provisioning requirements• billing• service orders• user interface characteristics• logs, alarms, and operational measurements (OM)Overview of the EIUThe EIU is an application-specific unit (ASU) that supports Ethernetconnectivity on the DMS-100 switch. You can configure the EIU as either anIP router or an OSI router. The EIU also supports host services.The EIU is intended primarily as a high-speed interface that providesconnectivity in a co-located environment such as that in a Central Office.However, if the EIU is deployed in a LAN extending beyond the co-locatedenvironment, you should observe the limitations and network security notes inthe caution above.The following list summarizes the router and host services that use dedicatedEIUs. For general information on ASUs, refer to “Appendix G: ASUbackground information”.Note: The following applications may not be available in all product linesor markets. For more information, consult with the specific Product LineManager or contact Nortel Networks.• Automated directory assistance service (ADAS). ADAS providesassistance to an operator by automatically prompting subscribers fordirectory assistance information. ADAS uses the EIU to supportmessaging between an ADAS OA&M position and the DMS-100 switch.• Billing server. Billing server allows the DMS-100 switch to forwardbilling and OM information from a DMS file processor (FP) to an externaloperating company billing processor. The OM data is sent to thedownstream processor through a different EIU. The system throttles thebilling server traffic at 36 kbyte/sec. Note that this application is onlysupported on DMS-250 or combinations with DMS-250 and GSM productlines.• Automatic file transfer (AFT). The AFT application lets the operatingcompany use TCP/IP to transport billing and operational measurement(OM) data from the DMS-250 IOC (input/output controller) disks to thedownstream processor over an Ethernet LAN. One EIU can support bothbilling and OMs. For this application, the recommended number of EIUsis two: one EIU is dedicated to billing data and the other is to OMs.AFT is also referred to as Madley AFT. Limited availability.
