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Technical Data Sheet
PartsTable / NETWORK / 42C1781
42C1781 ✓ Verified by PartsTable
IBM · NETWORK · 1GBE_NIC
WHAT YOU NEED TO KNOW
RJ45 = copper (needs CAT6) | SFP+ = fiber (needs transceiver) FLR = FlexibleLOM (HPE integrated) — NOT standard PCIe
Bracket height MUST match chassis — Full Height (2U) vs Low Profile (1U)
PRODUCT OVERVIEW

IBM NIC 1GbE RJ-45 2-P PCI-E-2.0x4 NetXtreme II 1000 CNTLR. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
NETWORK→ 1GBE_NIC→ 42C1781
SPECIFICATIONS
Part Number42C1781
ManufacturerIBM
Interface1GbE
Capacity1GB
COMPONENT DIAGRAM
NIC CTRL PHY 0 PHY 1 ROM VRM 1GbE 1GbE LINK ACT PCIe x8 ~167 mm NETWORK ADAPTER | 2-PORT 10GbE | 1GbE | Full Height PCIe x8 | Link/Activity LEDs | PXE boot ROM TITLE NIC ADAPTER PN 42C1781 MFR IBM IBM NIC 1GbE RJ-45 2-P PCI-E-2.0x4 NetXt
KEY FEATURES
•
1GbE Interface
•
1GB Capacity
TYPICAL APPLICATIONS
  • Data center top-of-rack switching
  • High-speed server interconnects (10G/25G/40G/100G)
  • Storage network fabric (iSCSI, FCoE)
  • Campus and branch network infrastructure
  • Firewall and security appliance connectivity
  • WAN edge and SD-WAN deployments
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
42C1780Compatible
IBM NIC 1GbE RJ-45 2-Port PCI-E-2.0x4 NetXtreme II 1000 Express Controller (BCM5709C) - Option
compatible
42C1782Compatible
IBM NIC 1GbE RJ-45 2-Port PCI-E-2.0x4 NetXtreme II 1000 Express Controller (BCM5709C) - FRU
compatible
42C1783Compatible
IBM NIC 1GbE RJ-45 2-Port PCI-E-2.0x4 NetXtreme II 1000 Express Controller (BCM5709C) - SBB
compatible
49Y4204Compatible
IBM NIC 1GbE RJ-45 2-Port PCI-E-2.0x4 NetXtreme II 1000 Express Controller (BCM5709C) - FRU
compatible
49Y4205Compatible
IBM NIC 1GbE RJ-45 2-Port PCI-E-2.0x4 NetXtreme II 1000 Express Controller (BCM5709C) - P/N
compatible
49Y7946Compatible
IBM NIC 1GbE RJ-45 2-Port PCI-E-2.0x4 NetXtreme II 1000 Express Controller (BCM5709C) - P/N
compatible
LIFECYCLE
StatusUNKNOWN
Availability—
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 7
42C1780SUBSTITUTE
IBM NIC 1GbE RJ-45 2-Port PCI-E-2.0x4 NetXtreme II 1000 Express Controller (BCM5709C) - P/N
IBM
42C1782SUBSTITUTE
IBM NIC 1GbE RJ-45 2-Port PCI-E-2.0x4 NetXtreme II 1000 Express Controller (BCM5709C) - P/N
IBM
42C1783SUBSTITUTE
IBM NIC 1GbE RJ-45 2-Port PCI-E-2.0x4 NetXtreme II 1000 Express Controller (BCM5709C) - P/N
IBM
49Y4204SUBSTITUTE
IBM NIC 1GbE RJ-45 2-Port PCI-E-2.0x4 NetXtreme II 1000 Express Controller (BCM5709C) - P/N
IBM
49Y4205SUBSTITUTE
IBM NIC 1GbE RJ-45 2-Port PCI-E-2.0x4 NetXtreme II 1000 Express Controller (BCM5709C) - P/N
IBM
49Y7946SUBSTITUTE
IBM NIC 1GbE RJ-45 2-Port PCI-E-2.0x4 NetXtreme II 1000 Express Controller (BCM5709C) - P/N
IBM
49Y7947SUBSTITUTE
IBM NIC 1GbE RJ-45 2-Port PCI-E-2.0x4 NetXtreme II 1000 Express Controller (BCM5709C) - P/N
IBM
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FREQUENTLY ASKED QUESTIONS
What is 42C1781?
42C1781 is a IBM NIC 1GbE RJ-45 2-P PCI-E-2.0x4 NetXtreme II 1000 CNTLR manufactured by IBM. It is classified as a NETWORK (1GBE_NIC).
What parts can replace 42C1781?
There are 7 known substitutes for 42C1781: 42C1780, 42C1782, 42C1783 and 4 more. Substitute compatibility should be verified for your specific system.
Is 42C1781 still available?
42C1781 is currently Unknown.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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Last verified: July 2026