Cisco 3825 Software Configuration Guide - Page 11
Overview of the Cisco 3825 Mobile Wireless Edge Router, Introduction
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1 C H A P T E R Overview of the Cisco 3825 Mobile Wireless Edge Router The Cisco 3825 Mobile Wireless Edge Router is a networking platform optimized for use in mobile wireless networks; specifically designed to be used at the cell site edge as a part of a 2G, 3G or 4G Radio Access Network (RAN). The Cisco 3825 Mobile Wireless Edge Router is a general purpose router platform specializing in 2/2.5G Global System for Mobile Communication (GSM) and 3G Universal Mobile Telecommunication System (UMTS) RAN backhaul transport and optimization. The Cisco 3825 router offers high performance at a low cost while meeting the critical requirements for deployment in cell sites, including small size, high availability, and DC input power flexibility. This chapter includes the following sections: • Introduction, page 1-1 • Cisco IOS Software Features, page 1-6 • MIB Support, page 1-10 • Limitations and Restrictions, page 1-11 • New Features in Cisco IOS Release 12.4(16)MR2, page 1-13 • New Features in Cisco IOS Release 12.4(16)MR1, page 1-13 • New Features in Cisco IOS Release 12.4(16)MR, page 1-27 Introduction A typical RAN is composed of thousands of Base Transceiver Stations (BTSs)/Node Bs, hundreds of Base Station Controllers/Radio Network Controllers (BSCs/RNCs), and several Mobile Switching Centers (MSCs). The BTSs/Node Bs and BSCs/RNCs are often separated by large geographic distances, with the BTSs/Node Bs located in cell sites uniformly distributed throughout a region, and the BSCs, RNCs, and MSCs located at suitably chosen central offices (COs) and/or Mobile Telephone Switching Offices (MTSOs). The traffic generated by a BTS/Node B is transported to the corresponding BSC/RNC across a network, referred to as the backhaul network, which is often a hub-and-spoke topology with hundreds of BTSs/Node Bs connected to a given BSC/RNC by point-to-point time-division multiplexing (TDM) trunks. These TDM trunks may be leased line T1/E1s or their logical equivalents, such as microwave links or satellite channels. The interface between the BTS and BSC in GSM and Code OL-15667-03 Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide 1-1