C H A P T E R1-1Cisco 3700 Series Routers Hardware Installation GuideOL-2180-081Overview of Cisco 3700 Series RoutersCisco 3700 series routers are modular access routers with LAN and WAN connections that can beconfigured by means of interchangeable network modules and interface cards.This chapter describes the features and specifications of the routers and includes the following sections:• Hardware Features, page 1-1• Modules, Interface Cards, and Memory, page 1-3• Memory, page 1-4• Interface Numbering, page 1-5• Power Supply Options, page 1-9• System Specifications, page 1-11• Regulatory Compliance, page 1-12Hardware FeaturesCisco 3700 series includes the Cisco 3725 and the Cisco 3745 routers, which provide the followingfeatures:• Cisco 3700 CompactFlash memory cards• Advanced integration module (AIM) slots• Support for double-wide network modules• Two sockets for synchronized DRAM (SDRAM)• User-configurable memory (shared memory or processor memory)• Two Fast Ethernet ports• High-speed console and auxiliary ports (up to 115.2 kbps)Cisco 3725Cisco 3725 routers include the following additional features:• High-performance 240-MHz Reduced Instruction Set Computer (RISC) processor• Up to 256 MB SDRAM• Up to 128 MB CompactFlash memory