Replacement for C2821SEC-K9-U-SRST: Drop-In Alternatives We Stock
Looking for a replacement for the C2821SEC-K9-U-SRST (Cisco C2821SEC/K9-U-SRST 2821 Integrated Services Router 2 x AIM, 4 x HWIC, 1 x Network Module, 3 x PVDM, 1 x EVM 2 x 10/100/1000Base-T)? Pro Disk Network ships Cisco drop-in replacements and equivalent modern parts from US inventory. Every alternate below is in-stock today with same-day shipping for orders placed before 2pm ET. If your unit is still under warranty, contact our engineering team — we offer cross-shipping for B2B customers on Net 30 terms.
About the C2821SEC-K9-U-SRST
| SKU | C2821SEC-K9-U-SRST |
|---|---|
| Product | Cisco C2821SEC/K9-U-SRST 2821 Integrated Services Router 2 x AIM, 4 x HWIC, 1 x Network Module, 3 x PVDM, 1 x EVM 2 x 10/100/1000Base-T |
| Stock status | In Stock |
| Detail page | View C2821SEC-K9-U-SRST › |
Drop-in replacements for C2821SEC-K9-U-SRST
Each part below is currently in our US warehouse, ships same-day for orders before 2pm ET, and includes our 90-day warranty. SKUs link to the full product page with photos, datasheets and B2B quote form.
Cisco C1861-SRST-F/K9 1861 8-Port 8 x 10/100/ PoE Fast Ethernet Integrated Services Router
SKU: C1861-SRST-F-K9
Price: $326.14
PWR-2821-51-AC-IP - Cisco PoE Power Supply for Cisco 2821 / 2851 Routers
SKU: PWR-2821-51-AC-IP
Price: $400.45
HWIC-2FE - Cisco Catalyst 2-Port Fast Ethernet High Speed WIC Card for Integrated Services Router
SKU: HWIC-2FE
Price: $594.75
HWIC-2FE-RF - Cisco 2-Port Fast Ethernet High Speed WIC Card for Integrated Services Router
SKU: HWIC-2FE-RF
Price: $700.50
How we pick replacements
Every recommendation above was selected using these criteria:
- Drop-in compatibility — same form factor (2.5"/3.5", PCIe slot, SFP port, etc.), so it fits the original chassis without modification
- Equivalent or better performance — matched on RPM/IOPS/speed/throughput, never downgraded
- Same-brand-preferred — we list the OEM-equivalent first when available, then trusted aftermarket
- Warranty coverage — 90-day Pro Disk warranty on every part, with 1-year option for B2B
- In stock today — never recommend a part that is on backorder
Need help confirming compatibility?
Our engineers validate every replacement against your specific server, switch, or chassis model before shipment. Email sales@prodisknetwork.com with your platform model (e.g., Dell PowerEdge R740, HP DL380 Gen10, Cisco Catalyst 9300) and we will confirm the exact part number that drops into your hardware.