Replacement for NTK591QB: Drop-In Alternatives We Stock
Looking for a replacement for the NTK591QB (NTK591QB - Nortel 1.25Gb/s 1.25GBase-CWDM Single-Mode Fiber 40km 1551nm 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 NTK591QB
| SKU | NTK591QB |
|---|---|
| Product | NTK591QB - Nortel 1.25Gb/s 1.25GBase-CWDM Single-Mode Fiber 40km 1551nm Duplex LC Connector SFP Transceiver Module |
| Current price | $367.03 |
| Stock status | In Stock |
| Detail page | View NTK591QB › |
Drop-in replacements for NTK591QB
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.
3HE00070CE - Alcatel 1Gbps 1000Base-CWDM 1551nm 120km Single-mode Fiber 1551nm SFP Transceiver
SKU: 3HE00070CE
Price: $243.74
NTK591QB-ACC - Accortec 1.25Gb/s 1.25GBase-CWDM Single-Mode Fiber 80km 1551nm Duplex LC Connector SFP Transceiver Module for Ciena Compatible
SKU: NTK591QB-ACC
Price: $451.49
NTK591PB - Nortel 1.25Gb/s 1.25Base-CWDM Single-Mode Fiber 40km 1530nm Duplex LC Connector SFP Transceiver Module
SKU: NTK591PB
Price: $367.03
CWDM-SFP10G-1590 - Cisco 10Gbps 10GBase-CWDM Single-mode Fiber 40km 1590nm Duplex LC Connector SFP+ Transceiver Module
SKU: CWDM-SFP10G-1590
Price: $1,533.26
CWDM-SFP10G-1310 - Cisco 10Gbps 10GBase-CWDM Single-mode Fiber 40km 1310nm Duplex LC Connector SFP+ Transceiver Module
SKU: CWDM-SFP10G-1310
Price: $1,690.88
CWDM-SFP10G-1290 - Cisco 10Gbps 10GBase-CWDM Single-Mode Fiber 40km 1290nm Duplex LC Connector SFP+ Transceiver Module
SKU: CWDM-SFP10G-1290
Price: $1,690.88
CWDM-SFP10G-1270 - Cisco 10Gbps 10GBase-CWDM Single-mode Fiber 40km 1270nm Duplex LC Connector SFP+ Transceiver Module
SKU: CWDM-SFP10G-1270
Price: $1,690.88
CWDM-SFP10G-1470 - Cisco 10Gb/s 10GBase-CWDM Single-Mode Fiber 40km 1470nm Duplex LC Connector SFP+ Transceiver Module
SKU: CWDM-SFP10G-1470
Price: $1,910.04
CWDM-SFP10G-1570 - Cisco 10Gbps 10GBase-CWDM Single-mode Fiber 40km 1570nm Duplex LC Connector SFP+ Transceiver Module
SKU: CWDM-SFP10G-1570
Price: $2,036.01
CWDM-SFP10G-1510 - Cisco Single-mode 10Gbps 10GBase-CWDM Fiber 40km 1510nm Duplex LC Connector SFP+ Transceiver Module
SKU: CWDM-SFP10G-1510
Price: $2,698.57
CWDM-SFP10G-1550 - Cisco Single-Mode 10Gbps 10GBase-CWDM Fiber 40km 1550nm Duplex LC Connector SFP+ Transceiver Module
SKU: CWDM-SFP10G-1550
Price: $2,807.63
CWDM-SFP10G-1490 - Cisco Single-Mode 10Gbps 10GBase-CWDM Fiber 40km 1490nm Duplex LC Connector SFP+ Transceiver Module
SKU: CWDM-SFP10G-1490
Price: $3,246.67
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.