Alternative to 21R9931AO: Better-Value Equivalents in Stock
Comparing the 21R9931AO (21R9931AO - Addonics 4Gbps 4GBase-LX Single-mode Fiber 4km 1310nm Duplex LC Connector SFP Transceiver Module) against alternatives? Pro Disk Network stocks 12 similar parts that offer comparable performance at different price points. Each option below is in-stock, US-warehoused, and tested-and-certified before ship. Bulk pricing is available on quantities of 5+; B2B procurement can use Net 30 with PO.
About the 21R9931AO
| SKU | 21R9931AO |
|---|---|
| Product | 21R9931AO - Addonics 4Gbps 4GBase-LX Single-mode Fiber 4km 1310nm Duplex LC Connector SFP Transceiver Module |
| Current price | $465.11 |
| Stock status | In Stock |
| Detail page | View 21R9931AO › |
Alternatives to 21R9931AO
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.
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
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
21R9931-ACC - Accortec 4Gbps 4GBase-LX Single-mode Fiber 4km 1310nm Duplex LC Connector SFP Transceiver Module
SKU: 21R9931-ACC
Price: $450.72
21R9931 - IBM 4Gbps 4GBase-LX Single-mode Fiber 4km 1310nm Duplex LC Connector SFP Transceiver Module
SKU: 21R9931
Price: $459.00
How we pick alternatives
Every recommendation above was selected using these criteria:
- Spec parity — capacity, speed, port count, and form factor matched within a 10% tolerance
- Price spread — alternatives shown across the price range, so you can pick on budget
- Brand mix — both OEM-equivalent and trusted aftermarket, all certified
- Reliability data — preferred parts have failure rates below 1% in our 18-month return tracking
- In stock today — shipping today, not 4-6 weeks from now
Want a side-by-side spec comparison?
We can prepare a written comparison covering throughput, power draw, form factor and validated compatibility. Email sales@prodisknetwork.com or call +1 (407) 205-8454 — most quotes ship within 4 business hours.