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https://www.gearlinkoptic.com/products/sfp28-25g-copper-twinax-cable-xm-dac/

SFP28 Direct Attach Cables (25G DAC ) are compliant with SFF-8432 and SFF-8402 specifications. Various choices of wire gauge are available from 30 to 26 AWG with various choices of cable length (up to 5m). The SFP28 passive direct attach copper cable assemblies are high-performance, cost-effective I/O solutions for 25G Ethernet. SFP28 copper cables allow hardware manufacturers to achieve high port density, configurability, and utilization at a very low direct attach sfp+ copper transceiver cost and reduced power budget of passive copper cable.

As one of professional optical transceiver companies, we also provide a range of optical transceivers, such as 400g optical transceiver, 100g optical transceivers, 40g qsfp+aatransceiver, 25g sfp28 transceiver, 10G SFP+ transceiver, sfp device, etc.

Compatibility of SFP28 DAC Cable

SFP-H25G-CU5M5M 25G SFP28 DAC
SFP-H25G-CU3M3M 25G SFP28 DAC
SFP-H25G-CU2M2M 25G SFP28 DAC
SFP-H25G-CU1M1M 25G SFP28 DAC

Technical Specification Of SFP28 25G DAC Cable xM
ParameterSymbolMinTypicalMaxUnitNote
Differential ImpedanceTDR90100110Ώ
Insertion lossSDD21-22.48-8dBAt 12.8906 GHz
Differential Return LossSDD11-12.45See 1dBAt 0.05 to 4.1 GHz
SDD22-3.12See 2dBAt 4.1 to 19 GHz
Common-mode to common-mode output return lossSCC11-2dBAt 0.2 to 19 GHz
SCC22
Differential to common-modeSCD11-12See 3dBAt 0.01 to 12.89 GHz
return lossSCD22-10.58See 4At 12.89 to 19 GHz
Differential to Common ModeSCD21-IL-10dBAt 0.01 to 12.89 GHz
Conversion LossSee 5At 12.89 to 15.7 GHz
-6.3At 15.7 to 19 GHz
Channel Operating MarginCOM-3dB