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C921-4P – Cisco 921 Gigabit Ethernet security router with internal power supply

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The Cisco C921-4P router offers enhanced security, high-speed connectivity, and superior performance for managing internet threats, making it an excellent investment for modern businesses. Integrated security features protect against varying threats, ensuring your network remains uncompromised. With dual Gigabit Ethernet WAN ports and a 4-port managed switch, it provides versatile connectivity options for various devices, facilitating a well-rounded network setup.

Robust security measures within the Cisco 921 ISR platform allow the router to offer defense against known and emerging online vulnerabilities. Ensuring data integrity and safe internet access is paramount in an era of proliferating cyber threats. Moreover, the ease of remote management through web-based tools and Cisco IOS® Software offers businesses complete control over their network configurations without the need for extensive on-site IT support.

Businesses that rely heavily on internet connectivity will benefit from the C921-4P’s reliable service continuity and its ability to monitor Operational, Administrative, and Maintenance activities as well as verify Service-Level Agreements. These capabilities certify the delivery of agreed-upon network performance and reliability.

The internal power supply further reduces device clutter, making it a convenient and space-saving solution for small and medium-sized businesses, branch offices, or any customer premises. The Cisco 900 Series ISR’s durable design and energy-efficient operation translate into a lower total cost of ownership over time, representing a sound investment for businesses looking to ensure long-term, secure, and reliable internet service.

C921-4P is the Cisco 921 Gigabit Ethernet security router with internal power supply. Cisco 900 Series ISRs deliver integrated security and threat defense, protecting networks from both known and new Internet vulnerabilities and attacks. These powerful, fixed-configuration routers provide secure broadband and Metro Ethernet connectivity. Service providers offering managed Ethernet WAN services can deploy them in customer locations as CPE. Centralized and remote management capabilities are available through web-based tools and Cisco IOS® Software for full visibility and control of network configurations at the remote site. The 900 Series ISRs simplify the deployment of Ethernet WAN services, with end-to-end Operations, Administration, and Maintenance (OA&M), Service-Level Agreement (SLA) monitoring and verification, and configuration management. This series ISRs come with a 4-port managed switch, providing LAN ports to connect multiple devices.

Quick Spec

Table 1 shows the quick spec.



WAN interfaces

2 ports Gigabit Ethernet (GE)

LAN interfaces

4-port GE managed switch

Integrated USB 2.0


Default and maximum DRAM

Default 1 GB

Default and maximum flash memory

2 GB; not upgradable

Dimensions (H x W x D)

1.70 x 9.0 x 9.5 in. (4.32 x 22.86 x 24.13 cm) (includes rubber feet)

Product Details

Figure 1 shows the front panel of C921-4P.


#6-32 Ground screw

GE LAN port

Power button

GE LAN port

Reset button

GE LAN port

Console Port

GE WAN port

USB2.0 port

GE WAN port

GE LAN port


Figure 2 shows the back panel of C921-4P.

Note: ① Power Connector

The Options

Table 2 shows the optional accessories.




AC Power Cord (Brazil), C13, NBR 14136, 2.1M


AC Power Cord (Europe), C13, CEE 7, 1.5M


Power Cord – China


AC Power Cord (India)


AC Power Cord (North America), C13, NEMA 5-15P, 2.1m


AC Power Cord (Italy), C13, CEI 23-16, 2.5m


Power Cord for South Korea 2m 10A


AC Power Cord (Japan), C13, JIS C 8303, 2.5m


Power Cord C13-C14, 2M/6.5ft Japan PSE mark


AC Power Cord (Taiwan), C13, EL 302, 2.3M


AC Power Cord (Japan), C13, 3 Prong Plug, 2.3M


AC Power Cord (Australia), C13, AS 3112, 2.5m


Power Cord South Africa


Console Cable 6ft with RJ45 and DB9F


Straight serial cable – RJ45 to DB25 male


Yellow Cable for Ethernet, Straight-through, RJ-45, 6 feet

Compare to Similar Item

Table 3 shows the comparison.


WAN interfaces

LAN interfaces

Integrated USB 2.0


2 ports Gigabit Ethernet (GE)

4-port GE managed switch



2 ports GE

4-port GE managed switch



1 port GE and 1 VADSL (Annex A)

4-port GE managed switch



1 port GE and 1 VADSL (Annex B/J)

4-port GE managed switch



1 port GE and 1 VADSL (Annex M)

4-port GE managed switch


Get More Information

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Why Choose C921-4P from Northland Systems

Affordability Meets Quality

The Cisco 921 Gigabit Ethernet security router (C921-4P) benefits from Northland Systems’ high standard of quality at wholesale prices. With a steadfast commitment to affordability, customers are assured of the 100% Low Price Guarantee, ensuring the best value without sacrificing product integrity.

Complimentary Expert Support

Acquiring the C921-4P from Northland Systems comes with the added advantage of free expert CCIE technical support. This value-added service extends proficiency to customers, assisting through various channels without the additional expense.

Transaction Security and Flexibility

Customers experience peace of mind with safe and adaptable purchasing options. Every transaction benefits from the security of certifications like McAfee Secure and VeriSign Secured, along with flexible shipping choices to meet diverse requirements.

Guaranteed Product Authenticity and Quality

Trust is paramount when investing in network infrastructure like the Cisco Router ISR 900 series. Northland Systems guarantees the authenticity of the C921-4P, available in pristine ‘New Sealed’ or top-tier ‘Used / Refurbished’ conditions, meticulously tested by Cisco-certified technicians for dependable performance.

Confidence in Purchases

Reinforcing customer assurance, Northland Systems stands by a 100% Money Back Guarantee. Investing in a Cisco 921 router is risk-free, promising satisfaction with every purchase.

Established Reputation and Attractive Discounts

Since 1997, Northland Systems has built a reputation for excellence. Customers of the Cisco Routers category can expect considerable savings, highlighting the economic benefits of sourcing from an established provider.

The Benefits of Pre-owned Hardware

Selecting pre-owned hardware like the Cisco 921 not only offers immediate cost reductions but also contributes to sustainability. Clients relish rapid delivery, inclusive warranty coverage, and the opportunity to procure legacy components, ensuring Routers support over extended periods.

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Cisco C921-4P security router with ports labeled, secure Gigabit Ethernet connectivity, integrated USB

C921-4P – Cisco 921 Gigabit Ethernet security router with internal power supply

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