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Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
Chapter       Overview of the Hardware and Software
Feature Information
New Modules and 
Interface Cards
Cisco 3900 series, 2900 series, and 1900 series ISRs introduce the 
following new modules and interface cards, which are inserted in the 
following new router slots:
• EHWIC
• PVDM3
• ISM
• SM
Note See the router’s product page at Cisco.com for a complete list of 
supported modules and interfaces.
Multi-Gigabit Fabric 
Communication
Cisco 3900 series, Cisco 2900 series, and Cisco 1900 series ISRs use a 
MGF
4
 for the new modules and interface cards to inter-communicate on 
the router. Legacy modules that support Cisco HIMI
5
 also support MGF 
to inter-communicate on the router. Next generation module drivers 
integrate with the MGF to perform port configurations, configure packet 
flow, and control traffic buffering. All configurations are performed from 
the module-side, which may or may not lead to changes on the MGF. For 
more information, see the “Configuring Multi-Gigabit Fabric 
Communication” section on page 211.
Integrated Application 
Services Features
Cisco 3900 series, 2900 series, and 1900 series ISRs offer integrated 
security features and voice features.
• See the “Configuring Security Features” section on page 127 
• See the “Unified Communications on Cisco Integrated Services 
Routers” section on page 169
1. SPE = Services Performance Engine
2. USB = universal serial bus
3. CF = CompactFlash
4. MGF = multi-gigabit fabric
5. HIMI = High-Speed Intrachassis Module Interconnect
Table 1 Feature Information (continued)
Feature Description