CHAPTER
1-1
Cisco 2900 Series and 3900 Series Hardware Installation Guide
OL-18712-02
1
Overview of the Routers
Cisco Integrated Services Routers Generation 2 (ISR G2) offer data functionality through Gigabit
Ethernet ports and security functionality with a virtual private network (VPN) accelerator on the
motherboard. Additional security features are available with add-on hardware and software.
Cisco 2900 series and Cisco 3900 series routers also provide voice IP telephony with digital signal
processor (DSP) capability; and voice gateway, DSP farm, IP-to-IP gateway, Cisco Unified
Communications Manager Express (CUCME) via Cisco IOS. Cisco Unity Express (CUE) is provided
through the use of add-on hardware.
This series of ISRs have new slots that support next generation Enhanced High-Speed WAN Interface
Cards (EHWICs), Internal Services Modules (ISMs), Packet Voice Data Modules (PVDM3s), Service
Modules (SMs), and Services Performance Engines (SPEs).
Access to the Cisco Multi-Gigabit Fabric (MGF) facilitates connection between switch ports on the ISR
without utilizing all of the external ports. A logical GE interface on the ISR connects external and
internal modules through the MGF for improved LAN and WAN switching.
Table 1-1 ISR G2 Models
The following sections are provided in this chapter:
• Chassis Views, page 1-2
• Locating the Serial Number, PID, VID and CLEI, page 1-12
• Hardware Features, page 1-17
• Slot, Port, and Interface Information, page 1-28
Series Routers
Cisco 2900
• 2901
• 2911
• 2921
• 2951
Cisco 3900
• 3925
• 3925E
• 3945
• 3945E
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