• Cisco Compatible CVR-QSFP28-SFP25G-BCC 100G to 25G Adapter with silver fiber optic connector, blue rubber strap and label
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Blue Cable Co

CVR-QSFP28-SFP25G-BCC | Cisco Compatible 100G to 25G SFP Adapter

CVR-QSFP28-SFP25G-BCC

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Description

The CVR-QSFP28-SFP25G-BCC is a drop-in compatible replacement for the Cisco CVR-QSFP28-SFP25G. This adapter converts a QSFP28 100G port to an SFP28 25G port for plug-and-play connectivity on Cisco switches and routers with QSFP28 interfaces. - Compliant with QSFP28 MSA SFF-8665 and SFP28 MSA SFF-8432, ensuring mechanical and electrical interoperability across vendor platforms - Converts a single 100G QSFP28 port to accept SFP28 25G or SFP+ 10G modules, enabling flexible speed migration without replacing host hardware - Routes the SFP28 high-speed data channel to lane 1 of the QSFP28 connector while leaving the other three lanes unconnected - Supports SFP28 25GBASE optics and DAC/AOC cables at rated reach, plus backward compatibility with SFP+ 10G modules - Built-in MCU enables I2C register access, allowing the host system to read module information directly from the installed SFP28 transceiver - Metal housing provides EMI shielding and thermal performance for operation from 0 to 70 degrees C

Features

• SFF-8665 and SFF-8432 compliance ensures the adapter fits QSFP28 cages and accepts SFP28 or SFP+ modules from any MSA-compliant vendor, not just those coded for Cisco
• Single-lane architecture uses only lane 1 of the QSFP28 connector, making this a true rate adapter rather than a breakout; the host port operates at 25G or 10G, not 100G
• Built-in microcontroller presents the inserted SFP28 module's EEPROM and DOM data to the host via the QSFP28 I2C interface, so the switch can identify and monitor the installed optic
• Low insertion loss and controlled crosstalk preserve signal integrity at 25 Gbps, meeting IEEE 802.3bm eye mask and BER requirements when paired with compliant SFP28 modules
• Metal housing acts as both EMI shield and heatsink, dissipating thermal load from the adapter itself plus conducted heat from the SFP28 module during sustained 25G operation
• Hot-swappable design allows field insertion and removal without powering down the host switch, provided the platform firmware supports the adapter SKU
• Enables incremental migration from 40G QSFP+ to 100G QSFP28 line cards by allowing continued use of existing SFP28 and SFP+ inventory on new 100G-native platforms

Warranty

5-Year Advanced Warranty on All Blue Cable Co® Products

Blue Cable Co® offers a comprehensive 5-Year Advanced Warranty on all our branded products. Our advanced warranty ensures fast, hassle-free replacements to keep your network running smoothly. If a fault occurs, we’ll deliver a replacement part before you return the faulty item—minimising downtime and giving you complete peace of mind.

Choose Blue Cable Co® for reliable, high-quality network components backed by industry-leading warranty support.

All technical data should be verified on the manufacturer data sheets.

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Technical Specifications

Also Known As

FAQs

Compatible SFP Selector

Technical Specifications

Brand: Blue Cable Co
BCC SKU: CVR-QSFP28-SFP25G-BCC
Compatible Replacement For: CVR-QSFP28-SFP25G
Compatibility: Cisco compatible
Lab Testing: Tested in Sydney, Australia
Warranty: 5-year advanced hardware replacement (Blue Cable Co)
Form Factor: QSFP28 host, SFP28 receptacle
Data Rate: 25 Gbps (SFP28), 10 Gbps (SFP+ backward compatible)
Standards: QSFP28 MSA SFF-8665, SFP28 MSA SFF-8432, IEEE 802.3bm (25GBASE), IEEE 802.3by (25GBASE)
Connector Type: QSFP28 host side, SFP28 receptacle
Power Consumption: 1.5W without module installed
Operating Temperature: 0 to 70 degrees C
Electrical Lanes: 1 active lane (lane 1), 3 lanes unused
Differential Impedance: 100 ohms

Also Known As

CVR-QSFP28-SFP25G=, CVR-QSFP28-SFP25G-RF

FAQs

Q: Will this work in place of the Cisco CVR-QSFP28-SFP25G?
A: Yes. This adapter is mechanically and electrically compliant with QSFP28 MSA SFF-8665 and SFP28 MSA SFF-8432, the same standards governing the Cisco original. It converts a QSFP28 100G port to accept any SFP28 25G or SFP+ 10G module, providing plug-and-play equivalence on Cisco platforms that support the CVR-QSFP28-SFP25G in their compatibility matrix.

Q: Which Cisco platforms support this adapter?
A: This adapter is supported on Cisco switches and routers with QSFP28 ports that list the CVR-QSFP28-SFP25G in their transceiver compatibility matrix. Verify your specific model, NX-OS, or IOS-XE version in the Cisco 100 Gigabit Ethernet Transceiver Modules Compatibility Matrix, as support may require a minimum software release for DOM and port state reporting.

Q: Can I use any SFP28 or SFP+ module in this adapter?
A: Yes, the adapter accepts any MSA-compliant SFP28 (25GBASE-SR, LR, CR, AOC) or SFP+ (10GBASE-SR, LR, CR, etc.) module or cable. The adapter's I2C bridge presents the installed module's EEPROM data to the host, so DOM parameters, vendor name, and part number are read from the SFP28 module itself, not from the adapter. The host switch must recognise and permit the inserted module per its own compatibility policy.

Q: Does the host QSFP28 port operate at 100G, 25G, or 10G when using this adapter?
A: The port operates at the speed of the inserted SFP28 or SFP+ module: 25 Gbps for SFP28, 10 Gbps for SFP+, or 1 Gbps for copper SFP if the platform permits. The adapter electrically connects only lane 1 of the QSFP28 connector; the other three lanes remain inactive. This is not a breakout cable configuration. Host firmware must support single-lane mode on the QSFP28 port for the link to establish.

Q: What happens if I install a 1G SFP copper module in this adapter?
A: The adapter will accept a 1000BASE-T SFP module mechanically and electrically, routing the signals to QSFP28 lane 1. However, whether the link comes up depends entirely on the host switch's ability to autonegotiate 1G speed on a QSFP28 port via the adapter. Many QSFP28 ports support only 10G and 25G modes when using a QSA adapter. Consult the platform data sheet or compatibility matrix for 1G SFP support via CVR-QSFP28-SFP25G.

Compatible SFP Selector

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Fully tested. No brand-tax. Sydney re-coding available if required.

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100% compatible with equipment from major vendors

Coded and tested in our state of the art lab in Sydney

Cisco sfp-10g-sr transceiver module with metallic housing and a white label displaying serial number, model details, and regulatory markings.
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Blue Cable Co
Cisco

Tested on real vendor hardware in Sydney

Every Blue Cable Co transceiver is coded for your platform and tested in our Sydney test rack on real vendor switches and firewalls before it ships. We check it is recognised and links up the same way the OEM optic does, so you don't find an "unsupported transceiver" error after it's installed.

Brands tested: Cisco, Meraki, Arista, Aruba, HPE, Juniper, Dell, Fortinet, Palo Alto, Check Point, Sophos, Moxa and NVIDIA. Speeds up to 100Gb.

  • 5 year replacement warranty
  • Sydney stock
  • Re-coding if you need it

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