The Cisco 3925E Integrated Services Router (ISR), model CISCO3925E/K9, offers significant benefits for large branch offices requiring reliable, high-performance networking solutions. It’s designed to deliver secure data, voice, video, and application services, making it a versatile infrastructure piece for a modern enterprise.
At the core of the Cisco 3925E is the Services Performance Engine (SPE) 200, which is engineered for scalability and service integration. The powerful SPE module within the router allows for upgrades, ensuring the router’s longevity and adaptability to growing business demands without the need for complete hardware replacements.
When it comes to performance, the Cisco 3925E does not disappoint. With support for up to 2GB of RAM and 8GB of flash memory, it can handle demanding tasks and accommodate future software updates or feature enhancements. Its integrated Gigabit Ethernet ports ensure high-speed connectivity. Additionally, the router’s SFP ports enable flexible network uplink capabilities.
Modularity is another key benefit of the CISCO3925E/K9. The router’s design includes two service module slots, three onboard DSP slots, and three Enhanced High-Speed WAN Interface Card (EHWIC) slots. These slots allow for high levels of customization and extension, tailoring the router’s function to specific needs—whether that’s improved WAN services, optimized voice and video operations, or efficient energy use with Cisco EnergyWise technology.
Security is foundational for Cisco devices, and this router has robust security features in place to protect against threats while ensuring compliance with business policies. Trustworthy Systems features, such as MACsec encryption, intrusion prevention, and secure connectivity, work together to keep data safe and secure.
Investing in the Cisco 3925E means opting for a device that has been designed with the future in mind—its ability to scale with your ever-changing business needs is one of its biggest selling points. It also reflects Cisco’s commitment to providing superior products that deliver continuous uptime and comprehensive support. Choosing the CISCO3925E/K9 is a strategic IT decision that supports resilience, expansion, and operational efficiency.
The Cisco 3925E router is designed for large branch offices, which delivers modular Services Performance Engine (SPE) 200.
Quick Specs
Figure 1 shows the appearance of the CISCO3925E/K9.
Table 1 shows the Quick Specs of the CISCO3925E/K9.
Product Code |
CISCO3925E/K9 |
Services Performance Engine module |
w/SPE 200 |
Rack Units |
3U |
Interfaces |
4 integrated 10/100/1000 Ethernet ports with 2 SFP ports |
Expansion Slot(s) |
2 service module slots 3 onboard digital signal processor (DSP) slots 3 Enhanced High-Speed WAN Interface Card (EHWIC) slots |
RAM |
1 GB (installed) / 2 GB (max) |
Flash Memory |
256 MB (installed) / 8 GB (max) |
Dimensions |
47.6 cm x 43.8 cm x 13.3 cm |
Package Weight |
23.52 Kg |
Product Details
Figure 2 shows the front panel of the Cisco 3925E/K9 router.
Note:
â‘ |
â‘¡ |
â‘¢ |
On/Off switch |
Power connector |
LEDs area |
Table 2 shows the LEDs area description.
LED |
Description |
|
SYS status LED |
Solid green |
Solid green indicates normal operation. |
Blinking green |
System is booting or is in ROM monitor mode. |
|
Amber |
System error. |
|
Off |
Power is off or system board is faulty. |
|
ACT status LED |
Solid or blinking green |
Solid or blinking indicates packet activity between the forwarding and routing engine and any I/O port. |
Off |
No packet transfers are occurring. |
|
POE |
Green |
IP phone power is on. |
Amber |
IP phone power is not on. |
|
PS1 / PS2 |
Green |
System is running. |
Amber |
System is not running. |
The back panel of CISCO3925E/K9 is similar with the CISCO3945E/K9 except that CISCO3925E has only 2 Services Module Slots.
Figure 3 shows the back panel of the Cisco router 3945E/K9 with LEDs, for reference only.
Note:
â‘ |
Compact flash 0 and 1 (0, right) |
⑤ |
S (Speed) |
â‘¡ |
PVDM3 0,1, and 2 (0, far right) |
â‘¥ |
L (Link) |
â‘¢ |
EN (Enable USB console) |
⑦ |
SFP S |
â‘£ |
EN (Enable RJ-45 console) |
â‘§ |
SFP EN |
Table 3 shows the description of these LEDs on the back panel.
LED |
Color |
Description |
Location |
CompactFlash 1 |
Green |
Flash memory is busy. |
Back Panel |
Amber |
Initialized with error. |
||
Blinking Green then turns off |
CompactFlash is ready for removal. |
||
CompactFlash 0 |
Green |
Flash memory is busy. |
Back Panel |
Amber |
Initialized with error. |
||
Blinking Green then turns off |
CompactFlash is ready for removal. |
||
S (Speed) |
1 blink + pause |
GE port operating at 10 Mb/s. |
Back Panel |
2 blink + pause |
GE port operating at 100 Mb/s. |
||
3 blink + pause |
GE port operating at 1000 Mb/s. |
||
L (Link) |
Green |
GE link is established. |
Back Panel |
Off |
No GE link is established. |
||
EN (RJ-45 console port) |
Green |
The RJ-45 console port is active. |
Back Panel |
EN (USB serial console port) |
Green |
The USB console port is active. |
Back Panel |
PVDM3 0,1, and 2 |
Green |
PVDM is initialized. |
Back Panel |
Amber |
PVDM is detected but not initialized. |
||
Off |
No PVDM installed. |
||
SFP S |
Blinking green |
Blinking frequency indicates port speed. |
Back Panel |
SFP EN |
Off |
Not present. |
Back Panel |
Green |
Present and enabled. |
||
Amber |
Present with failure. |
The back panel of CISCO3925E/K9 is similar with the CISCO3945E/K9 except that CISCO3925E has only 2 Services Module Slots.
Figure 4 shows the back panel of the Cisco 3945E router with slots and ports, for reference only.
Note:
â‘ |
EHWIC 0,1, and 2 (0, far right) |
⑦ |
SFP 1 and SFP 2 (1, Top) |
â‘¡ |
USB serial port |
â‘§ |
USB 0 and USB 1 (1, Left) |
â‘¢ |
AUX port |
⑨ |
Ground |
â‘£ |
RJ-45 serial console port |
â‘© |
Service module slots |
⑤ |
10/100/1000 Ethernet ports (GE 0/3, Top; GE 0/2, Bottom) |
⑪ |
Compact flash 0 and 1 (0, right) |
â‘¥ |
10/100/1000 Ethernet ports (GE 0/1, Top; GE 0/0, Bottom) |
The Cisco 3900 Series offers field-replaceable SPEs which allow you to protect your initial investment in the Cisco 3900 platform for a longer time period and scale router performance as your network and branch-office needs grow.
Figure 5 shows the SPE area and you can upgrade these slots and ports directly by one SPE module.
The Cisco 3900 Series offers field-replaceable SPEs which allow you to protect your initial investment in the Cisco 3900 platform for a longer time period and scale router performance as your network and branch-office needs grow.
Modularity Features
The Cisco 3925E router provides enhanced modular capabilities.
Table 4 shows modules for this router.
Models |
Description |
C3900-SPE200/K9 |
Cisco Services Performance Engine 200 for Cisco 3925E ISR (It’s a configured item in the CISCO3925E/K9.) |
SM-ES3G-16-P |
Enhanced EtherSwitch Service Module, L2/L3 switching, 16* 10/100/1000 GE ports, Enhanced POE, Cisco EnergyWise technology |
SM-ES3G-24-P |
Enhanced EtherSwitch Service Module, L2/L3 switching, 24 * 10/100/1000 GE ports, Enhanced POE, Cisco EnergyWise technology |
VWIC3-2MFT-G703 |
Cisco Voice/WAN Card VWIC3-2MFT-G703 |
HWIC-2T |
2-Port Serial WAN Interface Card Cisco Router High-Speed WAN Interface card |
EHWIC-1GE-SFP-CU |
Cisco 1900, 2900, 3900 Router EHWIC WAN Card EHWIC-1GE-SFP-CU |
EHWIC-4ESG |
Four port 10/100/1000 Base-TX Gigabit Ethernet switch interface card for Cisco 1900 2900 3900 Routers |
ISM-SRE-300-K9 |
Internal Services Module (ISM) with Services Ready Engine |
PVDM3-16 |
16-channel high-density voice DSP module |
MEM-CF-256U1GB |
256MB to 1GB Compact Flash Upgrade for Cisco 1900,2900,3900 |
MEM-CF-256U2GB |
256MB to 2GB Compact Flash Upgrade for Cisco 1900,2900,3900 |
MEM-CF-256U512MB |
256MB to 512MB CF Upgrade for Cisco 1900,2900,3900 ISR |
MEM-CF-256U4GB |
256MB to 4GB Compact Flash Upgrade for Cisco 1900,2900,3900 |
MEMUSB-1024FT |
1GB USB Flash Token |
Compare to Similar Routers
Table 6 shows the comparison of Cisco 3900 Series Routers’ four K9 models.
Model |
CISCO3925/k9 |
CISCO3945/k9 |
CISCO3925E/k9 |
CISCO3945E/k9 |
SPE |
w/SPE 100 |
w/SPE 150 |
w/SPE 200 |
w/SPE 250 |
Interface |
3GE |
3GE |
4GE |
4GE |
EHWIC slots |
4 |
4 |
3 |
3 |
SM slots |
2 |
4 |
2 |
4 |
ISM slots |
1 |
1 |
0 |
0 |
DSP |
4 |
4 |
3 |
3 |
SFP |
2 |
2 |
2 |
2 |
Rack Unit |
3U |
3U |
3U |
3U |
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