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QSFP-40G-ER4=
QSFP 40GBASE-ER4 TRANSCEIVER MODULE LC 40KM
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QSFP-40G-ER4= is a QSFP optical transceiver module engineered to deliver 40G data rate performance over single-mode fiber using LC duplex connectors. Designed for extended-range applications, this module supports Ethernet protocols and is ideally suited for high-performance data centers, enterprise networks, and telecom environments.
QSFP-40G-ER4= features a compact QSFP form factor with dimensions that meet industry standards, ensuring easy integration into diverse networking platforms. Its robust design, compliance with operating and storage temperature requirements, and compatibility with leading network vendors make it a reliable choice for extended-reach connectivity solutions.
QSFP-40G-ER4= price is $3,421.00, a 92.3% saving from the Cisco list price of $44,238.00. QSFP-40G-ER4= is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for QSFP-40G-ER4= for additional pricing. Browse the full 40G Base Modules series or explore all Cisco products.
A global cloud provider deploys the QSFP-40G-ER4 QSFP 40GBASE-ER4 TRANSCEIVER MODULE LC 40 KM to link primary and DR data centers across 35 km of single-mode fiber. The 40 Gbps throughput with ultra-low latency and advanced FEC ensures high-availability DCI. Outcome: consolidated aggregation links, 20 % lower OPEX, and 99.999 % uptime.
A financial firm integrates the QSFP-40G-ER4 40GBASE-ER4 TRANSCEIVER MODULE LC 40 KM to connect its trading floor to exchange servers 25 km apart. This module delivers 40 Gbps bandwidth, sub-50 µs latency and superior signal integrity under SLA constraints. Outcome: faster order execution, real-time market feeds, and minimized trading risk.
A Tier-1 telecom carrier upgrades regional POPs with QSFP-40G-ER4 QSFP 40GBASE-ER4 TRANSCEIVER MODULE LC 40 KM over legacy fiber spans up to 40 km. The solution offers 40 Gbps per channel, DWDM compatibility and reach without regeneration. Outcome: scalable subscriber bandwidth, deferred fiber CAPEX, and simplified network operations.
To get the detailed certification, please go to the Compliance Center.
| QSFP-40G-ER4= |  QSFP-H40G-AOC20M= |  QSFP-4SFP10G-CU2M= |  QSFP-4X10G-AOC1M= |  QSFP-H40G-CU5M= | |
|---|---|---|---|---|---|
| Product Type | Transceiver | Transceiver | Direct Attach Cable | Transceiver | Transceiver |
| Form Factor | QSFP | QSFP | QSFP to SFP+ | QSFP | QSFP |
| Data Rate | 40G | 40G | 10G | 40G (4x10G) | 40G |
| Connector Type | LC Duplex | MPO | N/A | Integrated Fiber-Optic | QSFP |
| Wavelength | 1310 nm | 850nm | N/A | 850nm | N/A |
| Transmission Distance | Extended-Range | Short-Range | Short-Range | Short-Range | Short-Range |
| Fiber Type | Single-mode | Multi-mode | N/A | Multi-mode | N/A |
| Max Distance | 40 km | 20m | 2m | 1 m | 5m |
| Supported Protocols | Ethernet | Ethernet | Ethernet | Ethernet | Ethernet |
| Network Interface | Fiber | Fiber | Ethernet | Fiber | Ethernet |
| Power Consumption | 3.5W | N/A | N/A | 2.5W | N/A |
| Operating Temperature | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C |
| Storage Temperature | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C |
| Input Voltage | 3.3V | 3.3V | N/A | 3.3V | N/A |
| Compatibility | Cisco, Juniper, Huawei, Arista | Cisco / Juniper / Huawei / Arista | Cisco / Juniper / Huawei / Arista | Cisco / Juniper / Huawei / Arista | N/A |
| Product Name | QSFP-40G-ER4= | QSFP-H40G-AOC20M= | QSFP-4SFP10G-CU2M= | QSFP-4X10G-AOC1M= | QSFP-H40G-CU5M= |
| Height | 0.55 inches | N/A | N/A | N/A | N/A |
| Width | 0.55 inches | N/A | N/A | N/A | N/A |
| Depth | 1.65 inches | N/A | N/A | N/A | N/A |
| Weight | 0.2 lbs | N/A | N/A | N/A | N/A |
ER4 transceiver provides long-range 40km single-mode connectivity with stable throughput. Perfect for campus backbone links.
High-quality optics with minimal latency and reliable performance.
Durable and consistent under heavy traffic conditions.
Professional-grade 40G ER4 module, excellent for enterprise and metro networks.
Maintains signal integrity over extended distances with low error rates.
The QSFP-40G-ER4= is a 40GBASE-ER4 QSFP+ transceiver that delivers 40 Gbps over single-mode fiber up to 40 km using LC duplex connectors.
It supports optical links up to 40 kilometers on G.652 single-mode fiber.
The module uses standard LC duplex connectors for single-mode fiber termination.
It operates at a nominal wavelength of 1310 nm across four 10 Gbps lanes.
Yes, the QSFP-40G-ER4= is fully hot-pluggable, allowing installation and removal without powering down the system.
The module aggregates four 10 Gbps lanes to deliver a total data rate of 40 Gbps.
It requires G.652 single-mode fiber optimized for long-reach transmission.
Yes, the QSFP-40G-ER4= is fully compatible with Cisco and most major vendor QSFP+ 40G Ethernet ports.
The standard operating range is 0 °C to 70 °C (32 °F to 158 °F) for commercial environments.
Typical power consumption is under 3.5 W during normal operation.
Yes, it supports SFF-8436 DDM for live monitoring of temperature, voltage, and optical power.
Insert it into a compatible QSFP+ port until it clicks, then connect LC duplex fiber cables, ensuring proper polarity.
The module includes a one-year limited warranty covering defects in materials and workmanship.
It’s ideal for long-haul data center interconnects, metro transport, and high-speed campus backbones.
Verify fiber cleanliness, confirm secure connector seating, check link configurations, and review DDM logs for power and temperature.
Order directly via our website or through authorized channel partners using SKU QSFP-40G-ER4=.