SFP-H25G-CU4M – 25G SFP28 DAC – 4m Passive Copper – RS-FEC
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SFP-H25G-CU4M Description
SFP-H25G-CU4M is a Cisco 25GBASE-CR1 SFP28 passive copper direct-attach cable for 4 m 25 Gigabit Ethernet links between supported Cisco SFP28 host ports. It is a fixed-length copper DAC assembly with SFP28 connectors on both ends, a green pull tab or bail latch, 0.1W maximum power consumption, and an RS-FEC requirement for the 4 m cable length, making it a BOM-matching option for short-reach switch, UCS fabric, or server-adapter connections where Cisco compatibility documentation confirms the host platform and software boundary.
Quick Specs
|
Parameter |
Specification |
|---|---|
|
Product ID |
SFP-H25G-CU4M |
|
Product type |
25GBASE-CR1 SFP28 passive copper cable |
|
Cable assembly type |
Direct-attach copper cable assembly |
|
Connector form |
SFP28 at both cable ends |
|
Ethernet rate |
25 Gigabit Ethernet |
|
Cable length |
4 meters |
|
Pull tab or bail latch color |
Green |
|
Maximum power consumption |
0.1W |
|
Host FEC requirement |
RS-FEC required for this 4-meter copper cable |
|
Operating temperature class |
Commercial 0 to 70 degrees C |
|
Compatibility reference |
Cisco Transceiver Module Group Compatibility Matrix |
Application Scenarios
SFP-H25G-CU4M fits Cisco 25G SFP28 paths where the planned copper route needs more reach than a 3-meter DAC but still stays inside the fixed passive-cable family.
Cisco Catalyst 9200 release notes list SFP-H25G-CU4M for C9200 and C9200L SKUs. Catalyst 9300 release notes list the same PID for C9300 SKUs with the C9300-NM-2Y 25G uplink network module, so the platform and module combination should be checked together.
Cisco UCS 9108 25G IFM documentation lists SFP-H25G-CU4M among supported 25G copper cables, while the Cisco UCS VIC 1400/14000 data sheet adds a release and firmware boundary for VIC 1455, VIC 1457, and VIC 1467 use. Keep those host-specific checks attached to the quote.
Product Comparison
|
Parameter |
SFP-H25G-CU4M | |||
|---|---|---|---|---|
|
Product type |
25GBASE-CR1 SFP28 passive copper cable |
25GBASE-CR1 SFP28 passive copper cable |
25GBASE-CR1 SFP28 passive copper cable |
25GBASE-AOC SFP28 active optical cable |
|
Cable assembly type |
Direct-attach copper cable assembly |
Direct-attach copper cable assembly |
Direct-attach copper cable assembly |
Active optical cable assembly |
|
Connector form |
SFP28 at both cable ends |
SFP28 at both cable ends |
SFP28 at both cable ends |
SFP28 at both cable ends |
|
Ethernet rate |
25 Gigabit Ethernet |
25 Gigabit Ethernet |
25 Gigabit Ethernet |
25 Gigabit Ethernet |
|
Cable length |
4 meters |
3 meters |
5 meters |
4 meters |
|
Pull tab or bail latch color |
Green |
Orange |
Gray |
Green |
|
Maximum power consumption |
0.1W |
0.1W |
0.1W |
1W |
|
Host FEC requirement |
RS-FEC required |
BASE-R FEC required |
RS-FEC required |
BASE-R FEC or RS-FEC required |
|
Ordering description |
25GBASE-CR1 SFP28 Passive Copper Cable 4-meter |
25GBASE-CR1 SFP28 Passive Copper Cable, 3-meter |
25GBASE-CR1 SFP28 Passive Copper Cable, 5-meter |
25GBASE-AOC SFP28 Active Optical Cable 4-meter |
- In a SFP-H25G-CU4M vs SFP-H25G-CU3M comparison, the key change is not media or connector type; it is the move from a 3-meter BASE-R FEC copper entry to a 4-meter RS-FEC copper entry.
- The SFP-H25G-CU4M difference from SFP-H25G-CU5M is fixed length and marker color, since both passive copper PIDs sit in the RS-FEC group and use the same 0.1W copper-cable value.
- SFP-H25G-CU4M vs SFP-25G-AOC4M is a 4-meter comparison between passive copper and active optical assemblies, with different media class and maximum power values.
- For which model to choose, use the table to match the required length, passive copper or active optical media, host FEC setting, and Cisco compatibility result before the line item is approved.
Selection Guide
1. Select the 4-meter passive copper PID for measured DAC paths
Choose SFP-H25G-CU4M when the rack route requires a 4-meter Cisco SFP28-to-SFP28 passive copper assembly and the host ports support RS-FEC.
2. Keep 3-meter copper orders out of the RS-FEC bucket
SFP-H25G-CU3M is the adjacent shorter passive copper PID, but Cisco places it in the BASE-R FEC group rather than the 4-meter and 5-meter RS-FEC group.
3. Use SFP-25G-AOC4M only for the active optical requirement
SFP-25G-AOC4M shares the 4-meter length and green marker, but Cisco identifies it as an active optical cable assembly with a different power value and FEC wording.
4. Confirm the exact host path before procurement approval
Verify the switch model, network module, UCS adapter, fabric interconnect, software release, and Cisco compatibility result for the real deployment path.
Ordering Checklist
|
Check Item |
What to Confirm |
Why It Matters |
|---|---|---|
|
Exact PID scan |
The order, packing label, and receiving record all show SFP-H25G-CU4M |
Nearby 25G cable PIDs differ by length, media type, and FEC behavior |
|
Rack measurement |
The installed path can use a fixed 4-meter DAC without extensions or excess slack |
Passive DAC length is fixed at purchase time |
|
Host FEC mode |
The target SFP28 ports can run RS-FEC for the 4-meter copper cable |
Cisco separates this length from the shorter no-FEC and BASE-R FEC copper entries |
|
Media class |
The BOM calls for 25GBASE-CR1 passive copper rather than a 4-meter active optical cable |
SFP-25G-AOC4M is a different cable family despite the same length and marker color |
|
Catalyst path |
C9200 or C9200L support, or C9300 with C9300-NM-2Y support, matches the planned switch order |
Cisco release notes identify specific switch and module boundaries |
|
UCS path |
Any VIC 1455, VIC 1457, VIC 1467, or UCS 9108 path is checked against Cisco release and firmware notes |
UCS support can depend on adapter, fabric interconnect, UCSM, and firmware levels |
|
Service protocol |
Any FCoE use includes the appropriate host software support |
Cisco states FCoE support for 25G DACs as a host-software-dependent condition |
Specifications
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Product ID | SFP-H25G-CU4M | Product type | 25GBASE-CR1 SFP28 passive copper cable |
| Ordering description | 25GBASE-CR1 SFP28 Passive Copper Cable 4-meter | Cable assembly type | Direct-attach copper cable assembly |
| Connector form | SFP28 at both cable ends | Ethernet rate | 25 Gigabit Ethernet |
| Cable length | 4 meters | Media class | Passive copper DAC |
| Pull tab or bail latch color | Green | Maximum power consumption | 0.1W |
| Host FEC requirement | RS-FEC required for this 4-meter copper cable | FCoE support condition | Supported with appropriate host software support |
| Operating temperature class | Commercial | Commercial operating temperature | 0 to 70 degrees C |
| Storage temperature range | -40 to 85 degrees C | Standards references | SFF-8402, SFF-8472, IEEE 802.3, IEEE P802.3by |
| Catalyst 9200 support example | Cisco IOS XE Amsterdam 17.2.1 notes list SFP-H25G-CU4M for C9200 and C9200L SKUs | Catalyst 9300 support example | Cisco IOS XE Amsterdam 17.2.1 notes list SFP-H25G-CU4M for C9300 SKUs with C9300-NM-2Y |
| UCS 9108 support example | Cisco lists SFP-H25G-CU4M as a 25GBASE-CU SFP28 Cable 4 Meter option | UCS VIC support boundary | VIC 1455, VIC 1457, and VIC 1467 support requires UCS-FI-6454 or UCS-FI-64108 with minimum UCSM 4.1(2a) and VIC firmware 5.1(2d) |
| Standard warranty | 5 years | Compatibility reference | Cisco Transceiver Module Group Compatibility Matrix |
Get More Information
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Questions & Answers
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What is SFP-H25G-CU4M?
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When is SFP-H25G-CU4M selected?
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Can SFP-H25G-CU4M operate at 10G?
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How is SFP-H25G-CU4M different from SFP-25G-AOC4M?
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What cable management issue affects SFP-H25G-CU4M?
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What endpoint check matters for SFP-H25G-CU4M?
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Where is SFP-H25G-CU4M a poor choice?
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What diagnostics apply to SFP-H25G-CU4M?
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