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Model Number:
CISCO3925/K9 Cisco 3900 Router ISR G2
Cisco 3925 w/SPE100(3GE.4EHWIC.4DSP.2SM.256MBCF.1GBDRAM.IPB)


Cisco3925/K9 Overview

Cisco 3900 series Integrated Services Routers provide rich media collaboration and virtualization to the branch while maximizing operational cost savings. The Integrated Services Routers are future-enabled with support for high capacity DSPs (Digital Signal Processors) for future enhanced video capabilities, high powered service modules with improved availability, multi-core CPUs, Gigabit Ethernet switching with enhanced POE.

Quick Specs

Figure 1 shows the appearance of the CISCO3925/K9 for reference.

Table 1 shows the Quick Specs of the CISCO3925 /K9.

Product CodeCISCO3925/K9
Form FactorDesktop
Services Performance Engine modulew/SPE 100
Rack Units3U
Interfaces3 integrated 10/100/1000 Ethernet ports with 2 ports capable of RJ-45 or SFP connectivity
Expansion Slot(s)2 service module slots
1 Internal Services Module slot
4 onboard digital signal processor (DSP) slots
4 Enhanced High-Speed WAN Interface Card (EHWIC) slots
RAM1 GB (installed) / 2 GB (max)
Flash Memory256 MB (installed) / 8 GB (max)
Dimensions47.6 cm x 43.8 cm x 13.3 cm
Package Weight27.78 Kg

Product Details

Figure 2 shows the front panel of the Cisco 3925 router for reference.


(1)On/Off switch
(2)Power connector
(3)LEDs area

Figure 3 shows the back panel of the Cisco 3925 router with slots and ports.


(1)Compact flash 0 and 1 (0, right)
(2)EHWIC 0,1,2 and 3 (0, far right)
(3)USB serial port
(4)RJ-45 serial console port
(5)AUX port
(6)SFP 1 and SFP 2 (2, top)
(7)10/100/1000 Ethernet port GE 0/1 and GE 0/2 (GE 0/1, down)
(8)10/100/1000 Ethernet port GE 0/0
(9)USB 0 and USB 1 (1,top)
(11)Service module slots

Modules and License

Table 2 shows modules and licenses for this router.

C3900-SPE100/K9Cisco Services Performance Engine 100 for Cisco 3925 ISR. (It’s a configured item in the CISCO3925/K9.)
SM-ES3G-16-PEnhanced EtherSwitch Service Module, L2/L3 switching, 16* 10/100/1000 GE ports, Enhanced POE, Cisco EnergyWise technology
SM-ES3G-24-PEnhanced EtherSwitch Service Module, L2/L3 switching, 24 * 10/100/1000 GE ports, Enhanced POE, Cisco EnergyWise technology
HWIC-2T2-Port Serial WAN Interface Card Cisco Router High-Speed WAN Interface card
EHWIC-1GE-SFP-CUCisco 1900, 2900, 3900 Router EHWIC WAN Card EHWIC-1GE-SFP-CU
EHWIC-4ESGFour port 10/100/1000 Base-TX Gigabit Ethernet switch interface card for Cisco 1900 2900 3900 Routers
ISM-SRE-300-K9Internal Services Module (ISM) with Services Ready Engine
MEM-CF-256U1GB256MB to 1GB Compact Flash Upgrade for Cisco 1900,2900,3900
MEM-CF-256U2GB256MB to 2GB Compact Flash Upgrade for Cisco 1900,2900,3900
MEM-CF-256U512MB256MB to 512MB CF Upgrade for Cisco 1900,2900,3900 ISR
MEM-CF-256U4GB256MB to 4GB Compact Flash Upgrade for Cisco 1900,2900,3900
MEMUSB-1024FT1GB USB Flash Token
L-FL-39-HSEC-K9=Cisco 3900 License L-FL-39-HSEC-K9 U.S. Export Restriction Compliance license for 3900 series
L-FL-39-SNA=Cisco 3900 Router License – FL-39-SNA= SNA E-Delivery License for Cisco 3925/3945 for Cisco 3900 Series
L-SL-39-APP-K9=Cisco Application Experience License ISR 3900 series – includes licenses for: AppX, DATA and WAASX.
L-SL-39-SEC-K9=Cisco 3900 License L-SL-39-SEC-K9 Security E-Delivery PAK for Cisco 3900 Series

CISCO3925/K9 Specification

ManufacturerCisco Systems, Inc
Manufacturer Part NumberCISCO3925/K9
Device / Product TypeRouter
TypeCisco 3925 Router ISR G2
Form FactorDesktop – modular – 3U
Connectivity TechnologyWired
Data Link ProtocolEthernet, Fast Ethernet, Gigabit Ethernet
CapacityCisco Unified Communications Manager Express sessions : 250
Cisco Unified SRST sessions : 730
Network / Transport ProtocolIPSec, PPPoE, L2TPv3
Routing ProtocolOSPF, IS-IS, BGP, EIGRP, DVMRP, PIM-SM, IGMPv3, GRE, PIM-SSM, static IPv4 routing, static IPv6 routing, policybased routing (PBR)
Remote Management ProtocolSNMP, RMON
Encryption AlgorithmSSL
FeaturesFirewall protection, VPN support, MPLS support, Syslog support, content filtering, IPv6 support, Class-Based Weighted Fair Queuing (CBWFQ), Weighted Random Early Detection (WRED), Access Control List (ACL) support, Quality of Service (QoS), Dynamic Multipoint VPN (DMVPN)
Compliant StandardsIEEE 802.3, IEEE 802.1Q, IEEE 802.1ah, IEEE 802.1ag
DRAM Memory1 GB (installed) / 2 GB (max)
Flash Memory256 MB (installed) / 8 GB (max)
LED Status Lights IndicatorsLink activity, power
Connectivity Slots 
Router InterfacesWAN : 3 x 10Base-T/100Base-TX/1000Base-T – RJ-45
Management : 1 x console – RJ-45
Management : 1 x console – mini-USB Type B
Serial : 1 x auxiliary – RJ-45
Hi-Speed USB : 2 x 4 PIN USB Type A
2 x SFP (mini-GBIC)
Expansion Slots Total (Free)4 ( 4 ) x EHWIC
4 ( 4 ) x PVDM
2 ( 1 ) x CompactFlash Card
2 ( 2 ) x service module (SM)
1 ( 1 ) x Expansion Slot
Power Supply 
Power DevicePower supply – internal
Voltage RequiredAC 120/230 V ( 50/60 Hz )
Dimensions / Weight / Miscellaneous 
Width47.6 cm (18.74 in)
Depth43.8 cm (17.24 in)
Height13.3 cm (5.24 in)
Package Weight27.78 kg (61.24 lbs)
Weight17.7 kg (39.02 lbs)
Compliant StandardsCISPR 22 Class A, CISPR 24, EN55024, EN55022 Class A, EN50082-1, AS/NZS 60950-1, AS/NZ 3548 Class A, CAN/
CSA-E60065-00, ICES-003 Class A, FCC CFR47 Part 15, EN300-386, UL 60950-1, IEC 60950-1, EN 60950-1, CSA C22.2
No.60065, BSMI CNS 13438, NEBS
System Software Cisco IOS IP Base