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Description
Cisco 1921 Integrated Services RouterThe Cisco 1921 Integrated Services Router (ISR) is a compact, high performance edge device designed for small to mid size branch offices that demand enterprise grade security, flexible connectivity, and scalable services. Building on the proven Cisco 1841 ISR platform, the 1921 delivers a robust foundation for data, voice, and security services within a single, reliable platform. It features embedded hardware encryption acceleration to offload
The Cisco 1921 Integrated Services Router (ISR) is a compact, high-performance edge device designed for small to mid-size branch offices that demand enterprise-grade security, flexible connectivity, and scalable services. Building on the proven Cisco 1841 ISR platform, the 1921 delivers a robust foundation for data, voice, and security services within a single, reliable platform. It features embedded hardware encryption acceleration to offload cryptographic tasks from the main processor, ensuring secure, high-speed VPNs and encrypted data paths without compromising performance. The 1921 also offers optional firewall, intrusion prevention system (IPS), and advanced security services that empower organizations to enforce strict network policies at the network edge, protecting against evolving threats while maintaining agility in a dynamic business environment.
- Secure, accelerated encryption: Embedded hardware encryption acceleration speeds up VPNs and encrypted traffic, reducing CPU load and delivering faster, more secure site-to-site and remote-access connections.
- Optional security stack: Choose firewall, intrusion prevention, and additional security services to harden the network perimeter without adding complexity or trade-offs in performance.
- Modular, scalable design: The Cisco 1921 supports flexible WAN connectivity and expansion through service modules, enabling you to scale throughput and features as your network grows.
- Enterprise-grade management: Cisco IOS Software provides familiar administration, robust policy control, and seamless integration with Cisco security architectures and management tools.
- Ideal for branch offices: A compact form factor, energy efficiency, and reliable operation make it a dependable gateway for voice, data, and security services at the edge.
Technical Details of Cisco 1921 Integrated Services Router
Technical details for the Cisco 1921 ISR are sourced from the specifications section of the product catalog on Synnex using the UPC or SKU as reference. Because configurations vary by model and licenses, exact figures such as aggregate routing throughput, VPN throughput, memory size, interface mix, and expansion options will differ. The following categories summarize the key specifications you can expect to find in the official spec sheets and catalog entries:
- Throughput and performance: Aggregate and VPN throughput capabilities, including the impact of hardware encryption acceleration on overall performance.
- Interfaces and expansion: Built-in Ethernet and serial interfaces with slots or slots-based modules for additional WAN/LAN connectivity and services.
- Security features: Hardware-accelerated encryption, optional firewall, IPS, and other advanced security services integrated with Cisco IOS.
- Management and software: Cisco IOS Software with CLI, Cisco Configuration Professional, and support for monitoring, logging, SNMP, NetFlow, and secure remote management.
- Power, reliability, and environment: Power requirements, temperature ranges, and reliability features appropriate for branch office deployments.
Because the Cisco 1921 ISR lineup includes various configurations and licensing options, customers should consult the Synnex catalog entry for UPC/SKU details to obtain precise values for throughput, memory, interface counts, and supported service modules. In practice, you can expect a device designed to balance performance with a broad feature set, enabling secure, scalable service delivery at edge sites while maintaining investment protection through modular growth pathways.
How to install Cisco 1921 Integrated Services Router
- Plan your deployment by selecting the appropriate WAN interfaces, security features, and license options that align with your branch office needs and growth projections.
- Unbox, place the router in a secure, well-ventilated location, connect power, and establish initial console access using the RJ-45 console port (or USB console, if available) to begin configuration.
- Power on the device and access the Cisco IOS CLI or a graphical management tool such as Cisco Configuration Professional for the initial setup. Configure device naming, administrator credentials, and management access controls before enabling services.
- Enable and configure required services, including routing protocols, VPNs, firewall rules, IPS settings if desired, and QoS policies to prioritize voice and time-sensitive data.
- Apply software updates and licenses as needed, save the configuration, and validate connectivity and security posture with test traffic, monitoring tools, and baseline security checks to ensure a proper, repeatable deployment.
Frequently asked questions
- What is the Cisco 1921 Integrated Services Router? The Cisco 1921 ISR is a modular, edge-focused router in the Cisco 1900 Series designed to deliver secure, integrated services—routing, security, and optional applications—at the network edge for small to mid-size branch offices.
- Does the 1921 include hardware encryption acceleration? Yes. Embedded hardware encryption acceleration offloads cryptographic operations, improving VPN throughput and secure data processing while reducing the load on the main processor.
- Are firewall and IPS optional on the 1921? The platform supports optional firewall, intrusion prevention system (IPS), and related security services that can be added based on your security requirements.
- What kinds of WAN interfaces and expansion options are available? The 1921 provides built-in Ethernet interfaces with expansion slots for service modules, allowing you to add additional WAN/LAN connectivity and features as needed.
- Can the 1921 handle VPNs and remote access? Yes. The router is designed to support site-to-site VPNs and remote-access VPNs, with hardware acceleration helping to maintain performance for encrypted traffic.
- How do I upgrade firmware and licenses? Upgrades are performed through Cisco IOS Software updates and license management, typically via the Cisco software download portal or through authorized resellers, with configuration preserved during upgrades.
- What deployment scenarios is the 1921 best suited for? It is ideal for small to mid-sized branch offices requiring secure edge connectivity, reliable routing, and optional security services, with room for growth as bandwidth needs and security requirements evolve.
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4.2 ★★★★★
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Product Reviews
★★★★★ 4
Good product, expensive price, poor adhesive
Premium packaging for a premium device. Useful for IR remote signal delivery with extra functions on the side. Price though is luxury for it’s use. Used this for a Logitech Harmony hub control of an non-smart electric fireplace. Setup is a breeze but only if you’re tech savvy. Highly recommend to watch the YouTube video for information on all it’s application. There a many other cheaper devices similar to this available on Amazon that I could have used for the same application. If you have a need for multiple control within the same vicinity of other devices, this may be more useful for you. However, if you plan on utilizing an IR repeater/extender for only a single device and would like to save some money, don’t buy this one. This device works quite well though. Have had no issues achieving the effect needed. Only four stars due to the poor adhesive on the emitter attachment. As stated earlier, I used this on an electric fireplace with a glass surface. I used the attachable emitter to the front glass sensor where the IR receiver was located on the fireplace. After only one day, the emitter attachment fell off even though I made sure the glass was thoroughly cleaned prior to adhering it. Otherwise a good product.
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Reviewed in the United States on November 8, 2019
★★★★★ 5
Denon avr ir remote port works great with sewell products
I bought a new entertainment center with glass doors and wasn't getting good signal range with the door closed. Plus i couldnt get a good of line site, since this cabinet was shorter than the orginal, and the location for my avr was further to the left than before and now my line of sight to the receiver was blocked from other parts of the room due to high couch back.
I tried a couple different cheap $10 devices that used stick on transmitters/receiver buttons but they were clumsy and didn't provide me a total solution for my room layout.
Works fantastic with a denon x1800 receiver (and many other models). It works directly with the denon's ir remote port in the back of the avr port. The solution is actually quite simple.
Plug a stereo 3.5 mm male to male plug in the denon ir port in the back of the avr and and the other end to the orange emitter box(puck). The pics are about the size of an oreo double stuff cookie Tuck the orange box/puck away whereever and plug the power in. The box doesn't need to seen or be pointed towards anything. It's location is only limited by the length of your stereo cable and access to AC power
Put the blue box puck anywhere in the room where you have general line of sight to it from where you will be using your remote, and plug power in. In my case, its sitting on top of one of my tower speakers. From there it clears the back of the couch and can see from the family room, eat-in kitchen area, and the kitchen beyond.
Done.
I didn't need or use any of the included emitter or transmitter cables, though if you dont have a denon, or other brand avr with an ir port to plug into , or also want to hide the blue puck ( in which case attach the included sensor cable), you'll need them. But for denon users with an ir port, you just use the two pucks and their usb power adapters. Simple.
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Reviewed in the United States on April 17, 2026
★★★★★ 1
Worked good then died at six months (Updated)
Worked good for a couple of months, then started to develop a lag between when you pressed a button on the remote, and when the TV would respond. If I moved the speaker blocking the TV’s IR receiver, and pointed the remote at it, it worked perfectly. Add the IR blaster back in and the delay returns. The delay kept getting longer and longer, sometimes 5 to 10 seconds. Then it just died. Would not pass any IR signals, even though the receiver and emitter both had power. Tried rebooting, changing communication channels to no avail. Out of Amazon return window. Manufacturer wants you do go through a troubleshooting process for warranty that is too complicated and time consuming. Customer Service Rep at Sewell send me a warranty replacement.
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Reviewed in the United States on May 21, 2025
★★★★★ 5
Nice Product and Customer Service
I ordered this BlastIR Wireless Pro IR Repeater from Sewell to replace a wired version of an IR repeater from another company. We have moved our TV on to a wall location and are in the process of hiding all the wiring out of sight behind walls and/or in a cabinet. We still have some wires to go, but this product has enabled us to eliminate the IR wiring all together. It's a real improvement in both looks and performance over the cheaper, wired version we originally tried.
The BlasterIR's Receiver is the component that faces the room and receives the IR signal from our remote controls. It's small enough to fit in the space between our sound bar and the bottom of the TV. It's range is great for our room size (about 22' long and 18' wide) and picks up the remotes signal from a side angle that's almost parallel to the TV itself. The receiver is powered through one of the USB ports integrated into the TV (although the device itself supports either a USB or regular plug-in option). I haven't used them yet but Sewell appears to have provided a few options to help with affixing the IR devices in their final positions including some adhesive pads and a magnetic pad option as well.
I'm still playing around with the permanent placement of the IR Blaster Emitter. It sits inside a closed cabinet and faces the concealed cable box receiver, router and DVR components. It retransmits the various IR signals it receives from the IR receiver by blasting that signal to anything it faces. I just placed it in the cabinet about 5" away from the devices I wanted to control, plugged it in and it worked with no other set up.
So far the BlastIR is working seamlessly and with much better function response time than the cheaper IR version we'd tried at first. The lag time between when a button is pressed on the remote control and the action taking place on the device I'm communicating with is minimal. The emitter itself is plugged into an outlet on a surge protector powering the other in-cabinet devices, although it too could be powered via the provided USB connection if desired.
As a note, we did experience a shipping issue during our ordering process. The order it self was processed quickly and shipped in a timely manner. However, there was an issue with our actual receipt of the product and the USPS who reported it delivered to our mailbox when in fact it had not been. Regardless, we reached out to Sewell directly and they quickly resolved the issue for us with no problems and in a timely manner. I would recommend both this IR Blaster Pro product as well as Sewell as a trusted company itself.
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Reviewed in the United States on February 8, 2021
★★★★★ 3
Does NOT Transmit Through Walls
Quick and easy setup! Works great within the room. However, will not work effectively between walls (i.e. - AV closet to living room).
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Reviewed in the United States on February 8, 2026