The Cisco 3925 Integrated Services Router (ISR) delivers highly secure data, voice, video, and application services to small branch offices.

 Key features include: 

• Modular Services Performance Engine (SPE) 100, which can be upgraded for even higher performance as next-generation WAN environments evolve
• 3 integrated 10/100/1000 Ethernet ports with 2 ports capable of RJ-45 or SFP connectivity
• 2 service module slots
• 4 Enhanced High-Speed WAN Interface Card (EHWIC) slots
• 4 onboard digital signal processor (DSP) slots
• 1 Internal Services Module slot
• Dual integrated power supplies
• Fully integrated power distribution to modules supporting 802.3af Power over Ethernet
• A universal IOS image that lets you deploy new IOS services quickly
• Security
  • Embedded hardware-accelerated VPN encryption for secure collaboration
  • Integrated threat control using Cisco IOS Firewall, Cisco IOS Zone-Based Firewall, Cisco IOS IPS, and Cisco IOS Content Filtering
  • Identity management using authentication, authorization, and accounting (AAA) and public key infrastructure
• Unified Communications
  • High-density-packet voice DSP module, optimized for voice and video support
  • Standards-certified VoiceXML browser services
  • Cisco Unified Border Element capabilities for up to 800 sessions
  • Cisco Unity Express voicemail support
  • Support for Cisco Communications Manager Express and Survivable Remote Site Telephony 

  Services and Slot Density	Cisco 3925
  Embedded hardware-based cryptography acceleration (IPSec + Secure Sockets Layer [SSL])	Yes
  Cisco Unified Communications Manager Express Sessions**	250
  Cisco Unified SRST sessions	730
  Total onboard WAN or LAN 10/100/1000 ports	3
  RJ-45-based ports	3
  SFP-based ports	2
  Service-module slots	2
  Doublewide service-module slots	1
  EHWIC slots	4
  Doublewide EHWIC slots	2
  ISM slots	1
  Online insertion and removal (OIR)	Services modules
  Onboard DSP (PVDM) slots	4
  Memory DDR2 ECC DRAM: Default	1 GB
  Memory DDR2 ECC DRAM: Maximum	2 GB
  Compact Flash (external): Default	Slot 0: 256 MB Slot 1: None
  Compact Flash (external): Maximum	Slot 0: 4 GB Slot 1: 4 GB
  External USB 2.0 slots (Type A)	2
  USB console port (Type B) (up to 115.2 kbps)	1
  Serial console port (up to 115.2 kbps)	1
  Serial auxiliary port (up to 115.2 kbps)	1
  Power-supply options	Internal : AC, PoE, and DC*
  Redundant power supply	Internal: AC, PoE, and DC*
  Power Specifications
  AC input voltage	100 to 240 VAC autoranging
  AC input frequency	47 to 63 Hz
  AC input current range, AC power supply (maximum)	7.1 to 3.0A
  AC input surge current	<50A
  Typical power (no modules) (watts)	100
  Maximum power with AC power supply (watts)	420
  Maximum power with PoE power supply (platform only) (watts)	420
  Maximum endpoint PoE power available from PoE power supply (watts)	520
  Maximum endpoint PoE power capacity with PoE boost (watts)	1040
  Dimensions (H x W x D)	5.25 x 17.25 x 18.75 in. (133.35 x 438.15 x 476.25 mm)
  Rack height	3RU
  Rack-mount 19in. (48.3 cm) EIA	included
  Rack-mount 23in. (58.4 cm) EIA	optional
  Wall-mount	No
  Weight with AC power supply (no modules)	39 lb (17.7 kg)
  Weight with PoE power supply (no modules)	40 lb (18.1 kg)
  Typical weight (with modules)	60 lb (27.2 kg)
  Airflow	Back to front
  Optional airflow kit (includes filter)	Front to Back