Replacement for 21R9931-ACC: Drop-In Alternatives We Stock
Looking for a replacement for the 21R9931-ACC (21R9931-ACC - Accortec 4Gbps 4GBase-LX Single-mode Fiber 4km 1310nm Duplex LC Connector SFP Transceiver Module)? Pro Disk Network ships 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 21R9931-ACC
| SKU | 21R9931-ACC |
|---|---|
| Product | 21R9931-ACC - Accortec 4Gbps 4GBase-LX Single-mode Fiber 4km 1310nm Duplex LC Connector SFP Transceiver Module |
| Current price | $450.72 |
| Stock status | In Stock |
| Detail page | View 21R9931-ACC › |
Drop-in replacements for 21R9931-ACC
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.
XBR-000142-ACC - Accortec 4Gbps 4GBase-LX Single-mode Fiber 4km 1310nm Duplex LC Connector SFP Transceiver Module
SKU: XBR-000142-ACC
Price: $243.97
FTLF1324P2BTL-ACC - Accortec 4.25Gb/s 1000Base-X Single-Mode Fiber 4km 1310nm Duplex LC Connector SFP (mini-GBIC) Transceiver Module
SKU: FTLF1324P2BTL-ACC
Price: $291.79
XBR-000143-ACC - Accortec 4Gbps 1000Base-LX Single-mode Fiber 4km 1310nm Duplex LC Connector SFP Transceiver (8-Pack) for Brocade Compatible
SKU: XBR-000143-ACC
Price: $1,365.08
57-1000014-01 - Brocade 4Gb/s 4GBase-LX Single-Mode Fiber 4km 1310nm Fiber Channel Duplex LC Connector SFP Transceiver Module
SKU: 57-1000014-01
Price: $178.72
371-1621 - Sun 4Gb/s Single-Mode Fiber Long wave 4km 1310nm Fiber Channel Duplex LC Connector SFP+ Transceiver
SKU: 371-1621
Price: $191.04
FTLF1324P2BTL - Finisar 4.25Gb/s 1000Base-X Single-Mode Fiber Long Wave Fibre Channel 4km 1310nm Duplex LC Connector SFP (mini-GBIC) Transceiver Module
SKU: FTLF1324P2BTL
Price: $65.26
100-652-516 - EMC 4Gbps 4GBase-LX Single-mode Fiber 4km 1310nm Duplex LC Connector SFP Transceiver Module
SKU: 100-652-516
Price: $74.96
10-2250-01 - Cisco Single-Mode 4Gbps Fibre Channel Fiber 4km 1310nm Duplex LC Connector SFP Transceiver Module
SKU: 10-2250-01
Price: $79.66
FTLX1370W3BTL - Finisar 10Gbps Single-Mode Fiber 1.4km 1310nm Duplex LC Connector SFP+ Transceiver Module
SKU: FTLX1370W3BTL
Price: $137.57
23R1703 - IBM 4.25Gbps 4GBase-LW Fibre Channel Single-mode Fiber 4km 1310nm Duplex LC Connector SFP Transceiver Module
SKU: 23R1703
Price: $178.72
21R9931 - IBM 4Gbps 4GBase-LX Single-mode Fiber 4km 1310nm Duplex LC Connector SFP Transceiver Module
SKU: 21R9931
Price: $459.00
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.