or providing access to the GPRS accounting records to the customer billing system. The available interfaces are FTP, ASCII, or ASN.1 formats. The architecture is typically distributed across two Sun servers for redundancy and robustness, but it is possible to have them running on single server. The Operations and Maintenance Center (OMC) and the Network Management Center (NMC) In all large telecommunications networks, one of the critical components is the ability to maintain and manage the network. In GSM networks, similar functions are required that are local to the switches and base stations. The Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Function of GPRS Elements Function of GPRS Elements Operations and Maintenance Center (OMC) is at this local level. In the over- all national or regional network, all the OMCs report to the Network Man- agement Center (NMC). OMC functions include Events and alarms on all switching components and procedures Fault management Performance management Security management NMC functions include Trunk route management High-level alarms OMC assistance OMC Communication GPRS Domain Managers GPRS has two major impacts on the Operations and Administration Systems, as shown in Figure 4-16: On the OMC-R, the presence of the PCUSN causes an impact to the A new domain manager is needed to manage the GPRS core network elements. We need a new OMC domain called OMC-Data (OMC-D). PCUSN OAM Server PCUSN management is performed at OMC workstation. The PCUSN con- figuration is performed at the workstation (OMC) and uses the PCUSN OAM server utilities. The Agprs interface configuration is performed from the OMC workstations, but uses OMC-R server utilities. Finally, PCUSN alarms are sent towards the OMC-R through the PCUSN OAM server for alarm translation. The OMC workstation is used for performance, fault management, and Ag