Cabletron Systems DMS-100 manual Overview of the EIU

22Chapter 1: Introduction to the EIU

•EIU provisioning requirements

•billing

•service orders

•user interface characteristics

•logs, alarms, and operational measurements (OM)

Overview of the EIU

The EIU is an application-specific unit (ASU) that supports Ethernet connectivity on the DMS-100 switch. You can configure the EIU as either an IP router or an OSI router. The EIU also supports host services.

The EIU is intended primarily as a high-speed interface that provides connectivity 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-located environment, you should observe the limitations and network security notes in the caution above.

The following list summarizes the router and host services that use dedicated EIUs. For general information on ASUs, refer to “Appendix G: ASU background information”.

Note: The following applications may not be available in all product lines or markets. For more information, consult with the specific Product Line Manager or contact Nortel Networks.

•Automated directory assistance service (ADAS). ADAS provides assistance to an operator by automatically prompting subscribers for directory assistance information. ADAS uses the EIU to support messaging between an ADAS OA&M position and the DMS-100 switch.

•Billing server. Billing server allows the DMS-100 switch to forward billing and OM information from a DMS file processor (FP) to an external operating company billing processor. The OM data is sent to the downstream processor through a different EIU. The system throttles the billing server traffic at 36 kbyte/sec. Note that this application is only supported on DMS-250 or combinations with DMS-250 and GSM product lines.

•Automatic file transfer (AFT) . The AFT application lets the operating company use TCP/IP to transport billing and operational measurement (OM) data from the DMS-250 IOC (input/output controller) disks to the downstream processor over an Ethernet LAN. One EIU can support both billing and OMs. For this application, the recommended number of EIUs is two: one EIU is dedicated to billing data and the other is to OMs.

AFT is also referred to as Madley AFT. Limited availability.

297-8991-910 Standard 03.01 August 1999