Cisco 900 Series ISR C931-4P Dual GE WAN Router, 4-Port GE LAN, 250 Mbps VPN
Email sales@sourceit.com.sg or use Request for Quotation below and our team will confirm the latest price, availability and lead time.
PRODUCT DESCRIPTION
Cisco 900 Series Integrated Services Router (C931-4P) — Local Warranty
Small branch router with security built in
The Cisco C931-4P is a Cisco 900 Series Integrated Services Router that combines internet access and comprehensive security in a single device, designed as customer premises equipment for small enterprise branch offices.
Dual Gigabit WAN, 4-port Gigabit LAN
It provides two Gigabit Ethernet WAN ports and a 4-port Gigabit Ethernet managed switch, plus an integrated USB 2.0 port.
250 Mbps encrypted throughput
Cisco's 900 Series FAQ rates the C931-4P at up to 250 Mbps maximum crypto throughput, compared with 150 Mbps on the C921-4P, making it the higher-performance choice for VPN-heavy sites.
Fanless and silent
Cisco states the 900 Series is fanless, passively cooled and noiseless, so it can sit in an office or retail space.
Internal power supply
The C931-4P has an internal universal power supply (100-240 VAC), avoiding an external power brick.
Cisco 900 Series ISR C931-4P Datasheet — Technical Specifications
Interfaces
| WAN | 2 x Gigabit Ethernet |
| LAN | 4-port Gigabit Ethernet managed switch |
| USB | USB 2.0 |
Performance & Security
| Maximum crypto throughput | Up to 250 Mbps |
| IPsec tunnels | 50 |
| VPN | IPsec VPN, DMVPN, FlexVPN, GET VPN, SSL VPN |
| Firewall | Zone-based policy firewall; stateful inspection transparent firewall |
| Encryption | Hardware-accelerated DES, 3DES, AES 128, AES 192, AES 256 |
Software & Memory
| Operating system | Cisco IOS |
| DRAM | 1 GB |
| Flash | 2 GB (not upgradable) |
| Licences | IP Base (default); APP, SEC, SEC-NPE |
Power
| Power supply | Internal |
| AC input | Universal 100 to 240 VAC, 50 to 60 Hz |
Physical & Environmental
| Dimensions (H x W x D) | 1.70 x 9.0 x 9.5 in. (4.32 x 22.86 x 24.13 cm) |
| Weight | 1.20 kg (2.65 lb) maximum |
| Cooling | Fanless, passive |
| Operating temperature | 0° to 50°C (de-rate 1°C per 1,000 ft altitude increase) |
| Operating humidity | 5% to 95% non-condensing |
| Mounting | Desktop; rack-mount kit ACS-900-RM-19 and under-desk mount kit available |
Compatibility & Software Support
Software
The C931-4P runs classic Cisco IOS Software and is configured by CLI or Cisco's web-based setup tools.
Licensing
IP Base is the default licence. Application Experience (APP) adds data and application features, and Security (SEC) adds security features with up to 250 Mbps IPsec performance.
End-of-Sale notice
Cisco's end-of-sale and end-of-life announcement for the Cisco ISR 900 Series routers (announced 28 July 2025) covers the C931-4P. Milestones: End-of-Sale 28 July 2026; Last Ship Date 27 October 2026; End of SW Maintenance Releases 28 July 2027; End of Vulnerability/Security Support 27 July 2029; Last Date of Support 31 July 2031. Cisco names the C1121-4P (ISR 1100 4P Dual GE SFP Router) as the replacement product.
Warranty
Sold by SourceIT as a Singapore unit with local warranty. Keep your SourceIT invoice as proof of purchase for warranty claims.
Package Contents & Cisco 900 Series Ordering Information
What the Part Number Covers
C931-4P is the 900 Series router with an internal power supply. The Cisco datasheet does not publish a full in-the-box list; the rack-mount kit (ACS-900-RM-19) is sold separately.
Cisco 900 Series Family
| Model | Key difference |
| C931-4P (this listing) | 2 x GE WAN, 4-port GE LAN, internal PSU, up to 250 Mbps crypto |
| Cisco 900 Series ISR C921-4P | Same interfaces and chassis, up to 150 Mbps crypto |
| C927-4P / C926-4P | 1 x GE + 1 x VDSL WAN, external 30 W adapter |
| Cisco ISR 1100 C1111-4P | IOS XE ISR 1100 with SD-WAN support; also end-of-sale |
Datasheet & Downloads
| Document | Link |
| Cisco 900 Series ISR Data Sheet | www.cisco.com |
| Cisco 900 Series ISR FAQ | www.cisco.com |
| Cisco 900 Series ISR support & documentation | www.cisco.com |
| End-of-Sale notice: ISR 900 Series Routers, Licenses and Accessories | www.cisco.com |
Frequently Asked Questions — Cisco C931-4P
What is the difference between the C931-4P and the C921-4P?
They share the same interfaces and chassis. Cisco rates the C931-4P at up to 250 Mbps maximum crypto throughput versus 150 Mbps on the C921-4P.
Is the C931-4P fanless?
Yes. Cisco states the 900 Series is fanless, passively cooled and noiseless.
Is the power supply internal?
Yes. The C931-4P has an internal universal 100-240 VAC power supply.
Can it be rack-mounted?
Yes, with the ACS-900-RM-19 rack-mount kit, which Cisco lists for the C921-4P, C931-4P and C921-4PLTE models.
Is the C931-4P end-of-sale?
Yes. End-of-Sale was 28 July 2026 and the last ship date is 27 October 2026. Security support continues to 27 July 2029 and support ends 31 July 2031. Cisco names the C1121-4P as the replacement.
