Cisco SFP-H25G-CU2.5M 25GBASE-CR1 SFP28 Passive DAC Cable — 2.5m, New
Warranty: Lifetime
25GBASE-CR1 passive DAC — SFP28 to SFP28 copper twinax, not optical AOC
Cisco SFP-H25G-CU2.5M — 25G SFP28 passive Direct Attach Copper cable, 2.5 meter
Cisco Part Number: SFP-H25G-CU2.5M
Common aliases / related PIDs: SFP-H25G-CU2M · SFP-H25G-CU3M · SFP-H25G-CU1M · 25GBASE-CR1
Description: Passive SFP28-to-SFP28 twinax DAC for short-reach 25 Gigabit Ethernet (25GBASE-CR1)
This is a genuine Cisco 2.5-meter 25GBASE-CR1 passive copper DAC — SFP28 connectors on both ends, yellow pull tab per Cisco’s length color code. It bridges short inter-rack 25G links without optics, with near-zero power draw and ultra-low latency.
Important: Cisco requires BASE-R FEC (FC-FEC) on the host ports for 2.5 m and 3 m passive DACs. Confirm your Nexus/Catalyst software and port FEC settings before production cutover.
Lifetime warranty from Resilient Tec.
Which One Do I Need?
| Going into | You need |
|---|---|
| Cisco 25G SFP28 ports, ~2.5 m reach, host supports BASE-R / FC-FEC | SFP-H25G-CU2.5M — this product |
| Same platforms, 2 m and you prefer no FEC requirement | SFP-H25G-CU2M (2 m) |
| Same platforms, 1 m intra-rack | SFP-H25G-CU1M (1 m) |
| Compatible (third-party) 1 m DAC at a lower ticket | SFP-H25GB-CU1M Compatible |
| Longer reach or fiber plant instead of copper DAC | 25G SFP28 SR/LR optics + fiber — not this cable |
Length and FEC matter. Cisco rates 1 m / 1.5 m / 2 m without host FEC; 2.5 m and 3 m require BASE-R (FC-FEC); 4 m / 5 m require RS-FEC.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | SFP-H25G-CU2.5M |
| Form Factor | SFP28 to SFP28 |
| Ethernet Standard | IEEE 802.3by 25GBASE-CR1 |
| Data Rate | 25 Gbps |
| Cable Type | Passive Direct Attach Copper (twinax DAC) |
| Cable Length | 2.5 meters (8.2 ft) |
| Wire Gauge | 30 AWG (typical) |
| Pull Tab Color | Yellow (Cisco length code) |
| Power Consumption | Passive, ~0.1 W max |
| Host FEC | BASE-R / FC-FEC required |
| Operating Temperature | 0°C to 70°C (commercial) |
| Standards | IEEE 802.3by, SFF-8402, SFP28 MSA, RoHS |
| Compatibility | Cisco switches/servers with 25G SFP28 ports (e.g. Nexus 9000/3000, Catalyst 9300/9400/9500) |
| Warranty | Lifetime, backed by Resilient Tec |
| Condition | New |
Note on FEC for 2.5 m
Unlike the 1–2 m siblings, the 2.5 m passive DAC sits in Cisco’s BASE-R FEC band. If your host cannot enable FC-FEC / BASE-R on those ports, choose SFP-H25G-CU2M (2 m) or an AOC/optic path instead.
Good to Know
- Genuine Cisco PID — EEPROM coded for Cisco 25G SFP28 platforms.
- Hot-pluggable; enable BASE-R FEC on both ends for reliable 2.5 m links.
- Yellow pull tab matches Cisco’s published length color for 2.5 m.
- New condition — factory-new inventory from Resilient Tec stock.
Quick Checklist — Is This the Right Cable?
You have two 25G SFP28 cages. The run is about 2.5 meters. Your hosts support BASE-R / FC-FEC. You want a passive copper DAC, not an AOC or optic+fiber. You specifically need the Cisco SFP-H25G-CU2.5M PID.
Availability
In stock at Resilient Tec · Ships from Knoxville, TN.
Need 1 m, 2 m, or another length in the SFP-H25G-CUxM family? Ask and we will point you at the right sibling. Request a quote →
Warranty: lifetime, backed by Resilient Tec.
You Might Also Need
- Cisco SFP-H25G-CU2M — 25G DAC, 2 m, New
- Cisco SFP-H25G-CU1M — 25G DAC, 1 m, New
- SFP-H25GB-CU1M Cisco Compatible — 25G DAC, 1 m
- Product guides · Request a quote
Related Guides
Lifetime warranty — how Resilient Tec backs what we sell
25GBASE-CR1 passive DAC — SFP28 to SFP28 copper twinax, not optical AOC
Cisco SFP-H25G-CU2.5M — 25G SFP28 passive Direct Attach Copper cable, 2.5 meter
Cisco Part Number: SFP-H25G-CU2.5M
Common aliases / related PIDs: SFP-H25G-CU2M · SFP-H25G-CU3M · SFP-H25G-CU1M · 25GBASE-CR1
Description: Passive SFP28-to-SFP28 twinax DAC for short-reach 25 Gigabit Ethernet (25GBASE-CR1)
This is a genuine Cisco 2.5-meter 25GBASE-CR1 passive copper DAC — SFP28 connectors on both ends, yellow pull tab per Cisco’s length color code. It bridges short inter-rack 25G links without optics, with near-zero power draw and ultra-low latency.
Important: Cisco requires BASE-R FEC (FC-FEC) on the host ports for 2.5 m and 3 m passive DACs. Confirm your Nexus/Catalyst software and port FEC settings before production cutover.
Lifetime warranty from Resilient Tec.
Which One Do I Need?
| Going into | You need |
|---|---|
| Cisco 25G SFP28 ports, ~2.5 m reach, host supports BASE-R / FC-FEC | SFP-H25G-CU2.5M — this product |
| Same platforms, 2 m and you prefer no FEC requirement | SFP-H25G-CU2M (2 m) |
| Same platforms, 1 m intra-rack | SFP-H25G-CU1M (1 m) |
| Compatible (third-party) 1 m DAC at a lower ticket | SFP-H25GB-CU1M Compatible |
| Longer reach or fiber plant instead of copper DAC | 25G SFP28 SR/LR optics + fiber — not this cable |
Length and FEC matter. Cisco rates 1 m / 1.5 m / 2 m without host FEC; 2.5 m and 3 m require BASE-R (FC-FEC); 4 m / 5 m require RS-FEC.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | SFP-H25G-CU2.5M |
| Form Factor | SFP28 to SFP28 |
| Ethernet Standard | IEEE 802.3by 25GBASE-CR1 |
| Data Rate | 25 Gbps |
| Cable Type | Passive Direct Attach Copper (twinax DAC) |
| Cable Length | 2.5 meters (8.2 ft) |
| Wire Gauge | 30 AWG (typical) |
| Pull Tab Color | Yellow (Cisco length code) |
| Power Consumption | Passive, ~0.1 W max |
| Host FEC | BASE-R / FC-FEC required |
| Operating Temperature | 0°C to 70°C (commercial) |
| Standards | IEEE 802.3by, SFF-8402, SFP28 MSA, RoHS |
| Compatibility | Cisco switches/servers with 25G SFP28 ports (e.g. Nexus 9000/3000, Catalyst 9300/9400/9500) |
| Warranty | Lifetime, backed by Resilient Tec |
| Condition | New |
Note on FEC for 2.5 m
Unlike the 1–2 m siblings, the 2.5 m passive DAC sits in Cisco’s BASE-R FEC band. If your host cannot enable FC-FEC / BASE-R on those ports, choose SFP-H25G-CU2M (2 m) or an AOC/optic path instead.
Good to Know
- Genuine Cisco PID — EEPROM coded for Cisco 25G SFP28 platforms.
- Hot-pluggable; enable BASE-R FEC on both ends for reliable 2.5 m links.
- Yellow pull tab matches Cisco’s published length color for 2.5 m.
- New condition — factory-new inventory from Resilient Tec stock.
Quick Checklist — Is This the Right Cable?
You have two 25G SFP28 cages. The run is about 2.5 meters. Your hosts support BASE-R / FC-FEC. You want a passive copper DAC, not an AOC or optic+fiber. You specifically need the Cisco SFP-H25G-CU2.5M PID.
Availability
In stock at Resilient Tec · Ships from Knoxville, TN.
Need 1 m, 2 m, or another length in the SFP-H25G-CUxM family? Ask and we will point you at the right sibling. Request a quote →
Warranty: lifetime, backed by Resilient Tec.
You Might Also Need
- Cisco SFP-H25G-CU2M — 25G DAC, 2 m, New
- Cisco SFP-H25G-CU1M — 25G DAC, 1 m, New
- SFP-H25GB-CU1M Cisco Compatible — 25G DAC, 1 m
- Product guides · Request a quote
Related Guides
Lifetime warranty — how Resilient Tec backs what we sell