Replacement for NTK591PB: Drop-In Alternatives We Stock
Looking for a replacement for the NTK591PB (NTK591PB - Nortel 1.25Gb/s 1.25Base-CWDM Single-Mode Fiber 40km 1530nm 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 NTK591PB
| SKU | NTK591PB |
|---|---|
| Product | NTK591PB - Nortel 1.25Gb/s 1.25Base-CWDM Single-Mode Fiber 40km 1530nm Duplex LC Connector SFP Transceiver Module |
| Current price | $367.03 |
| Stock status | In Stock |
| Detail page | View NTK591PB › |
Drop-in replacements for NTK591PB
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.
CWDM-SFP10G-1530 - Cisco Single-mode 10Gbps 10GBase-CWDM Fiber 40km 1530nm Duplex LC Connector SFP+ Transceiver Module
SKU: CWDM-SFP10G-1530
Price: $3,707.84
Cisco DS-CWDM4G1530 Single-mode 4.25Gbps 4GBase-CWDM Fiber 40km 1530nm Duplex LC Connector SFP Transceiver Module
SKU: DS-CWDM4G1530
Price: $176.21
DS-CWDM8G1530 - Cisco 8Gb/s 8GBase-CWDM Fibre Channel Single-mode Fiber 40km 1530nm Duplex LC Connector SFP+ Transceiver Module
SKU: DS-CWDM8G1530
Price: $1,358.86
SFP-10GCWER-53-ACC - Accortec 10Gb/s 10GBase-ER CWDM Single-Mode Fiber 40km 1530nm Duplex LC Connector SFP+ Transceiver Module
SKU: SFP-10GCWER-53-ACC
Price: $3,303.91
TN-XFP-LR4-C53 - Transition 10Gbps CWDM 10GBase-ER Fiber Channel 1530nm Single-mode 40km Duplex LC Connector XFP Transceiver Module
SKU: TN-XFP-LR4-C53
Price: $3,495.34
DS-CWDM4G1530-AS - Agilestar 4.25Gbps 4GBase-CWDM Single-mode Fiber 40km 1530nm Duplex LC Connector SFP Transceiver Module
SKU: DS-CWDM4G1530-AS
Price: $3,974.33
ONS-XC-10G-1530-RF - Cisco 10.5Gbps OC192/10GE/OTU2 CWDM Single-mode Fiber 40km 1530nm Duplex LC Connector XFP Transceiver Module
SKU: ONS-XC-10G-1530-RF
Price: $4,089.57
ONS-XC-10G-1530 - Cisco 10.5Gbps OC192/10GE/OTU2 CWDM Single-mode Fiber 40km 1530nm Duplex LC Connector XFP Transceiver Module
SKU: ONS-XC-10G-1530
Price: $6,270.21
10-2553-01 - Cisco 10Gbps 10GBase-CWDM OC192/10GE/OTU2 Single-mode Fiber 40km 1530nm Duplex LC Connector XFP Transceiver Module
SKU: 10-2553-01
Price: $6,604.18
CWDM-SFP-1530-RGD - Cisco 1Gbps 1000Base-CWDM Fibre Channel Single-mode Fiber 80km 1530nm Duplex LC Connector SFP Transceiver Module
SKU: CWDM-SFP-1530-RGD
Price: $177.17
CWDM-SFP-1530-RF - Cisco 1Gb/s 1000Base-CWDM Single-Mode Fiber 80km 1530nm Duplex LC Connector SFP Transceiver Module
SKU: CWDM-SFP-1530-RF
Price: $221.30
SFP-1GE-LH-CWDM-1530 - Juniper 1Gbps 1000Base-CWDM Single-mode Fiber 80km 1530nm Duplex LC Connector SFP Transceiver Module
SKU: SFP-1GE-LH-CWDM-1530
Price: $251.54
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.