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ER4 transceiver provides long-range 40km single-mode connectivity with stable throughput. Perfect for campus backbone links.
QSFP-40G-ER4=
QSFP 40GBASE-ER4 TRANSCEIVER MODULE LC 40KM
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Name:
QSFP-40G-ER4=
- Description:
- QSFP 40GBASE-ER4 TRANSCEIVER MODULE LC 40KM
- Rating:
Added to cart 28 times recently
- Availability:
In stock - Ready to Ship
- Brand:
- Cisco
- GTIN:
- 821455286517
- Condition:
- Warranty:
- 3
- List Price:
$44,238.00
- Price:
$3,421.0092.3% off
Quantity:
1
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QSFP-40G-ER4= Overview
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.
QSFP-40G-ER4= Specifications
- Product Type
- Transceiver
- Form Factor
- QSFP
- Data Rate
- 40G
- Connector Type
- LC Duplex
- Wavelength
- 1310 nm
- Transmission Distance
- Extended-Range
- Fiber Type
- Single-mode
- Max Distance
- 40 km
- Supported Protocols
- Ethernet
- Network Interface
- Fiber
- Power Consumption
- 3.5W
- Operating Temperature
- 0 to 70°C
- Storage Temperature
- -40 to 85°C
- Input Voltage
- 3.3V
- Compatibility
- Cisco, Juniper, Huawei, Arista
- Product Name
- QSFP-40G-ER4=
- Height
- 0.55 inches
- Width
- 0.55 inches
- Depth
- 1.65 inches
- Weight
- 0.2 lbs
QSFP-40G-ER4= Use Case
Cloud Data Center Interconnect Over 40 km Fiber
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.
Ultra-Low-Latency Financial Trading Network
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.
Carrier Ethernet Backbone Capacity Expansion
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.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
 QSFP-40G-ER4= |  QSFP-H40G-AOC20M= |  QSFP-4SFP10G-CU2M= |  QSFP-4X10G-AOC1M= |  QSFP-H40G-CU5M= | |
|---|---|---|---|---|---|
| Compatibility | Cisco, Juniper, Huawei, Arista | Cisco / Juniper / Huawei / Arista | Cisco / Juniper / Huawei / Arista | Cisco / Juniper / Huawei / Arista | N/A |
| Connector Type | LC Duplex | MPO | N/A | Integrated Fiber-Optic | QSFP |
| Data Rate | 40G | 40G | 10G | 40G (4x10G) | 40G |
| Depth | 1.65 inches | N/A | N/A | N/A | N/A |
| Fiber Type | Single-mode | Multi-mode | N/A | Multi-mode | N/A |
| Form Factor | QSFP | QSFP | QSFP to SFP+ | QSFP | QSFP |
| Height | 0.55 inches | N/A | N/A | N/A | N/A |
| Input Voltage | 3.3V | 3.3V | N/A | 3.3V | N/A |
| Max Distance | 40 km | 20m | 2m | 1 m | 5m |
| Network Interface | Fiber | Fiber | Ethernet | Fiber | Ethernet |
| Operating Temperature | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C |
| Power Consumption | 3.5W | N/A | N/A | 2.5W | N/A |
| Product Name | QSFP-40G-ER4= | QSFP-H40G-AOC20M= | QSFP-4SFP10G-CU2M= | QSFP-4X10G-AOC1M= | QSFP-H40G-CU5M= |
| Product Type | Transceiver | Transceiver | Direct Attach Cable | Transceiver | Transceiver |
| Storage Temperature | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C |
| Supported Protocols | Ethernet | Ethernet | Ethernet | Ethernet | Ethernet |
| Transmission Distance | Extended-Range | Short-Range | Short-Range | Short-Range | Short-Range |
| Wavelength | 1310 nm | 850nm | N/A | 850nm | N/A |
| Weight | 0.2 lbs | N/A | N/A | N/A | N/A |
| Width | 0.55 inches | N/A | N/A | N/A | N/A |
Reviews & Ratings
V
Victor Nash
4
High-quality optics with minimal latency and reliable performance.
I
Isla Lane
5
Durable and consistent under heavy traffic conditions.
H
Harlan Pierce
3
Professional-grade 40G ER4 module, excellent for enterprise and metro networks.
S
Selena Hayes
4
Maintains signal integrity over extended distances with low error rates.
Questions & Answers
What is the QSFP-40G-ER4= transceiver module?
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.
What transmission distance does the QSFP-40G-ER4= support?
It supports optical links up to 40 kilometers on G.652 single-mode fiber.
Which connector type does the QSFP 40GBASE-ER4 use?
The module uses standard LC duplex connectors for single-mode fiber termination.
What wavelength does the QSFP-40G-ER4= operate on?
It operates at a nominal wavelength of 1310 nm across four 10 Gbps lanes.