Cisco QSFP-40G-CSR4 Compatible QSFP+ 40G SR4 Transceiver Module | 40GBASE‑CSR4 850nm 400m MPO Support 4x10G Breakout Connectivity Bulk Wholesale
Product Overview
HYTOPTODEVICE QSFP+ 40G SR4 transceiver is drop-in replacement for Cisco QSFP-40G-CSR4. It follows 40GBASE-CSR4 standard at 850nm, delivering 300m over OM3 and 400m over OM4 multimode fiber with MPO-12 connector. This module supports 4×10G breakout, preloaded with Cisco-compatible EEPROM to avoid unsupported transceiver alerts. With DDM monitoring and hot-swap capability, it is ideal for data center fabric upgrades. HYTOPTODEVICE offers bulk wholesale and custom EEPROM services for system integrators. distributors, wholesaler and enterprise buyers.
Key Technical Specifications
| Cisco Compatible |
QSFP-40G-CSR4 |
Vendor Name |
HYTOPTODEVICE |
| Form Factor |
QSFP+ |
Max Data Rate |
42Gbps (4x 10.5Gbps) |
| Wavelength |
850nm |
Max Distance |
300m@OM4/400m@OM3 |
| Connector |
MTP/MPO |
Transmitter Type |
VCSEL 850nm |
| Cable Type |
MMF |
Receiver Type |
PIN |
| TX Power |
-8.0~2.0dBm |
Receiver Sensitivity |
< -13dBm |
| Power Consumption |
≤1.5W |
Modulation |
NRZ |
| Protocols |
40G Ethernet, SATA/SAS3, IEEE 802.3ba, MSA Compliant |
Operation Temperature |
0 to 70°C (32 to 158°F) |
For detailed technical specifications, please refer to the
Datasheet
Usage Guidelines & Best Practices
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Fiber Choice: Only compatible with OM3 / OM4 multi‑mode MPO‑12 trunk cabling; single‑mode fiber cannot facilitate 850 nm SR4 operation and will produce link failure.
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Distance Limit: Max 300m (OM3) / 400m (OM4). Dirty end faces, excessive splicing and sharp bending will reduce actual transmission distance.
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Cleanliness & Dust: Keep dust caps on whenever unattached. Clean fiber end-faces with a optical cleaning pen before insertion; dust causes over 80% of optical link failures.
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Installation Specification: Hot‑plug supported; keep MPO connector end‑faces clean, observe minimum fiber‑bend radius requirements.
- Breakout Configuration: Enable breakout mode via switch command line; do not mix 40G mode and breakout mode on the same port.
For detailed operation instructions, please refer to the
User Guide.
Full Compatibility List and Supported Devices
1. Supported Hardware & Firmware
Pre-configured Juniper optimized EEPROM delivers stable plug-and-play performance for Juniper switching and routing platforms. Each transceiver goes through real machine verification to prevent link instability and unsupported transceiver warnings.
Validated Juniper Platforms:
• QFX5100, QFX5120, QFX10000 series data center switches
• EX4600, EX9200 series enterprise core switches
• MX10003, MX10008, MX204 universal routing platforms
• All Juniper hardware fitted with native QSFP+ 40GBASE-SR4 ports
2. Multi-Brand Cross Compatibility
Built to MSA standards, this QSFP+ 40G SR4 CSR4 module works with Arista, HPE, Dell and other major brand switches for mixed-vendor leaf-spine fabric.
3. Free Value-Added Services
- Custom EEPROM programming for multi-platform compatibility
- Sample testing available before bulk orders for project validation
- Private label customization and professional deployment guides
- Rigorous batch quality consistency control
- Custom EEPROM configuration for special and legacy network setups
- Free EEPROM recoding with 24/7 technical support
Primary Application Scenarios
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Long-distance leaf-spine fabric interconnection (300-400m) for Cisco data center architectures, solving ordinary QSFP+ 40G SR4 short-distance limitations
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10G/40G hybrid network upgrade via 4x10G breakout connectivity, reusing existing 10G cabling to save upgrade costs
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High-bandwidth trunk aggregation for enterprise core network and IDC computer room cross-rack interconnection
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Legacy Cisco network renovation, replacing aging modules to fix QSFP+ 40G SR4 link instability issues
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Large-scale bulk deployment for cloud computing, virtualization and high-concurrency business scenarios
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Multi-vendor mixed fabric networking and staged data center bandwidth expansion projects
Connectivity Solutions(Applications)
1.40GbE Switch-to-Switch Connectivity
2.40GbE Structured Cabling Interconnect
3.40GbE Switch-to-NIC Interconnection
4. 40G to 4x10G Breakout Connectivity
5.Leaf-Spine Architecture
The Core Feature
1. 40G Connectivity for Data Center
High speed, low overhead. The QSFP+ 40G transceiver brings gigabit-class throughput to dense data center racks while drawing less power and taking up less space.
2.100% Compatibility-Tested for Reliable Deployment
Deploy with confidence: every 40G QSFP+ module is rigorously tested for compatibility in the target switch environment — no surprises, no downtime. Not sure it fits? Get our
Compatibility Video on request.
3. 100% Individually Tested for Peak Performance
Every unit is tested individually — no sampling, no shortcuts — to ensure optical compliance and continuous operational stability. Curious how we do it? Take a virtual tour of our
Test Center.
FAQ
Q1: Why do standard QSFP+ 40G SR4 modules fail to meet my 300m+ transmission needs?
Ordinary 40GBASE-SR4 modules only support max 150m transmission on OM4 fiber, which cannot cover large computer room cross-rack deployment. This Cisco QSFP-40G-CSR4 compatible module adopts enhanced CSR4 specification, extending the distance to 300m (OM3) and 400m (OM4), specially optimized for long-range multimode 40G networking scenarios that standard QSFP+ 40G SR4 modules cannot support.
Q2: How to enable the 4x10G breakout function of this QSFP+ 40G SR4 module on Cisco switches?
The breakout function needs simple CLI configuration on Cisco IOS/IOS-XE devices. After inserting the module stably, enable port breakout mode through official commands, and the single 40G QSFP+ port will be automatically split into four independent 10G SFP+ active ports. Our team provides professional configuration tutorials to ensure one-step successful activation without link errors.
Q3: Will this third-party QSFP+ 40G SR4 CSR4 module trigger Cisco device compatibility alarms?
No alarm will be generated. We pre-flash exclusive Cisco-matched EEPROM firmware for each module and complete real-machine verification. It perfectly bypasses the Cisco device vendor lock mechanism, realizing zero-alarm identification, stable DOM monitoring and hot-swap operation, completely solving the common QSFP+ 40G SR4 unsupported transceiver error problem.
Q4: Is the 400m long-distance transmission of this CSR4 module stable enough for business data transmission?
Extremely stable. The module strictly complies with IEEE 40GBASE-CSR4 industrial standards, with total link loss controlled within the standard threshold. After 72-hour full-rate burn-in testing, it achieves ultra-low bit error rate and zero packet loss, fully meeting long-term stable transmission requirements for data center trunk links and enterprise core business traffic.
Q5: Can I mix this breakout QSFP+ 40G SR4 module with ordinary SR4 modules for link interconnection?
It is not recommended for mixed deployment. To ensure link stability, it is required that both ends of the fiber link adopt consistent CSR4/SR4 specification modules. This QSFP+ 40G SR4 CSR4 module is compatible with standard SR4 links, but mixed use will limit the maximum transmission distance and disable the breakout function.
Q6: What fiber type is most suitable for maximizing the 400m long-range performance of this module?
OM4 or OM5 multimode fiber is the best match, which can realize the full 400m ultra-long transmission distance. OM3 fiber supports up to 300m, while OM2 and lower-grade multimode fibers are not recommended, as they will cause insufficient bandwidth and excessive optical loss, resulting in QSFP+ 40G SR4 link instability.
Q7: Does this QSFP+ 40G SR4 module support real-time DDM optical parameter monitoring on Cisco devices?
Fully supported. Compliant with SFF-8436 DDM/DOM protocol, the module can accurately display real-time data such as optical power, operating temperature and working voltage on Cisco device management pages, facilitating real-time QSFP+ 40G SR4 link health inspection and daily operation and maintenance troubleshooting.
Q8: Can this module be hot-swapped during the running of Cisco business ports?
Safe hot-swap is supported. The module complies with QSFP+ MSA hot-plug electrical and mechanical design standards, with built-in ESD protection components. It supports online plugging and replacement without shutting down the device or interrupting business, which is convenient for daily network maintenance and module replacement.
Q9: What solutions do you provide for QSFP+ 40G SR4 link flapping and packet loss problems?
We provide one-stop troubleshooting solutions: pre-shipment full optical parameter calibration, free EEPROM rewriting for incompatible firmware, professional fiber end face cleaning guidance and port configuration optimization suggestions. All bulk modules support batch consistency testing to eliminate batch QSFP+ 40G SR4 link failure risks.
Q10: What after-sales warranty and technical support are available for bulk wholesale orders?
We provide 5-year official warranty and standardized RMA after-sales service for all bulk QSFP+ 40G SR4 module orders. Professional technical team provides 24/7 remote guidance for breakout configuration, compatibility debugging and link troubleshooting, supporting full-cycle protection for large-scale project deployment.
Packaging & Custom OEM Solutions
Every 40G QSFP+ SR4 module ships in sealed ESD-safe packaging, ready for same-day dispatch. Bulk orders offer OEM customization—logo printing and private labeling—tailored for network distributors, integrators, and enterprise deployments.
Why Network Engineers Choose HYTOPTODEVICE
HYTOPTODEVICE has supplied over 5000,000 optical transceiver modules to data centers, ISPs, and enterprise networks across 100+ countries since 2011. Every module undergoes a 72-hour burn-in test and full DDM/DOM validation before shipment.
- 100% MSA-compliant modules with Cisco, Huawei,Dell,Juniper, and Arista compatibility
- ISO 9001:2015 certified manufacturing facility in Shenzhen
- Average lead time of 3–5 business days with DHL/FedEx express options
- Dedicated pre-sales engineering support for custom configurations
- Actual hardware,actual switches,actual results.we publish compatibility test video,eliminate compatibility anxiety. you can watch before you buy.
- We can provide inspection and shipping videos to make you feel as if you are right here with the product.
“Phenomenal performance. We deployed 200 HYTOPTODEVICE SFP+ modules to replace Cisco OEMs in our backbone network. Result? Zero compatibility issues and a 60% reduction in costs. Highly recommended for mission-critical networks."— Senior Network Engineer, Regional Telecom, Australia
Quality Certification & Compliance
At HYTOPTODEVICE, our quality commitment is backed by industry-standard validations. From fiber optical transceiver manufacturing to final visual inspection, from IQC、IPQC、FQC to OQC, our processes ensure global compliance and reliability.
We adhere to rigorous standards for our SFP modules and network solutions:
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ISO 9001: Certified quality management and production consistency.
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CE & FCC: Fully compliant for seamless Global Market Access.
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RoHS: Committed to environmental responsibility and hazardous material control.
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Proven Reliability: Rigorous testing to reduce compliance risk and ensure safety.
Certified Quality. Global Standards. Guaranteed Performance.
Rigorous Industrial Product Testing
100% 3rd Party Compatible
Partial Test Demonstration
