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Cisco 2900 Series and 3900 Series Hardware Installation Guide
OL-18712-02
Chapter 1 Overview of the Routers
Hardware Features
Services Performance Engine
Services Performance Engines (SPEs) are modular motherboards for Cisco 3900 series ISRs. The SPE
includes PVDM3 slots and system memory slots, and the ISM slot. The Services Performance Engine
provides a modular approach to system upgrades. Slide out the SPE from the router to replace internal
modules, or to upgrade the SPE for improved router performance.
See the “Removing and Replacing the Services Performance Engine” procedure on page 5-6 for
installation information.
Table 1-6 lists four SPE models that are supported on Cisco 3900 series routers. SPEs illustrations are
shown in the “Chassis Views” section on page 1-2. SPEs come preinstalled in 3900 series routers, or they
are purchased separately and installed in a 3900 series router. See the support table for more information.
Note
The SPE 200 and the SPE 250 include a cryptographic accelerator for improved security
performance. See the “Cryptographic Accelerator” section on page 1-27 for more information.
Service Modules
Service Modules (SM) are the largest modules on Cisco 2900 series and Cisco 3900 series ISRs. With
the largest form-factor and power capacity, these modules deliver high-performance service
applications. SMs are physically larger than legacy network modules, as a result, network modules
require an adapter for installation. See the Installing Cisco Network Modules in Cisco Access Routers
guide for installation instructions,
http://www.cisco.com/en/US/docs/routers/access/interfaces/nm/hardware/installation/guide/InstNetM.
html.
Enhanced High-Speed WAN Interface Cards
Enhanced High-Speed WAN Interface Card (EHWICs) are the latest generation of interface cards.
EHWICs are installed in the EHWIC slot on the router. Legacy interface cards, such as WAN interface
cards (WICs), voice interface cards (VICs), high-speed WAN interface cards (HWICs), double-width
high-speed WAN interface cards (DHWICs), and (EHWICs) are supported in the EHWIC slot on the
router.
Services Performance Engine 200 and Services Performance Engine 250 support the following legacy
interface cards in the EHWIC slots. (See
Table 1-7.)
4. PVDM3 slots support the installation of PVDM2 modules with an appropriate adapter. PVDM2s can not be intermixed with PVDM3s. See the
Hardware Installation Guide for router.
Ta b l e 1-6 Services Performance Engine Support
Services Performance Engines Cisco 3925 Cisco 3945
SPE 100 supported —
SPE 150 — supported
SPE 200 supported —
SPE 250 — supported
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