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Home / Products / Transceivers / 25G/40G Transceivers / 40G QSFP+ / 74708

Cisco QSFP-40G-ER4 Compatible 40GBASE-ER4 QSFP+ 1310nm 40km Optical Transceiver Module

Product No :74708
US$ 419.00
Compatible
Transceivers type
187 in real-time stock, 07Jul, 2025

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1. Rate: 40G; Connector: Duplex lC; with DDM
2. DFB+PIN; Low Power Consumption <3.5W
3. Applied in Campus Network and Data Center
4. Fully Compatible with 100+ Vendors
5. QSFP+ MSA Compliant
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Specifications

Cisco QSFP-40G-ER4 Compatible 40GBASE-ER4 QSFP+ Optical Transceiver Module (SMF, 1310nm, 40km, LC, DDM)

 

The Cisco QSFP-40G-ER4 compatible 40G QSFP+ transceiver module is equipped with LC duplex connectors, reaching a link up to 10km over OS2 single-mode fiber (SMF). This 40G optical transceiver comes with a bidirectional 4-channel QSFP+ connector, enabling a total of 40 Gbps bandwidth by each channel carrying a 10 Gbps data rate. DOM/DDM (digital diagnostics monitoring) function is supported on the 40G fiber optic transceiver to achieve real-time operating parameters monitoring.

 

QSFPTEK manufactured 40GBASE-ER4 QSFP+ module is compliant with QSFP+ MSA and IEEE 802.3ba 40GBASE-ER4 specifications. Besides, the quad small form-factor pluggable (QSFP) ER4 optic has been tested on host devices to ensure full compatibility with Cisco equipment, such as data center switches, enterprise routers, and server network interface cards (NICs). The third-party 40G SFP module is an ideal substitute to the Cisco QSFP-40G-ER4 QSFP+ 40G transceiver at an affordable price, providing a cost-effective compatible solution for high-performance 40G connectivity.

 

ER4 40G QSFP optics cater to 40 Gigabit Ethernet (40GbE) optical fiber connections, ideal for high-performance and long-distance applications in long-haul networks, campus networks, metro networks, etc.

 

Model Name QSFP-40G-ER4 Vendor Name QSFPTEK
Form Factor QSFP+ Data Rate 40 Gbps
Wavelength 1310nm Distance 40km@OS2
Connector LC Duplex Cable Type OS2 SMF
Transmitter Type DFB Receiver Type PIN
TX Power -2.7~4.5dBm Receiver Sensitivity <-19dBm
Power Consumption <3.5W Modulation Format NRZ
DDM Support Bit Error Ratio (BER) 1E-12
Protocols IEEE 802.3ba, QSFP+ MSA, SFF-8436, Infiniband 40G QDR Warranty 5 Years
Quality Testing Program
Optical Transceivers Testing

Take a look at our test program to get the reliable and high-performance optical transceivers.

Quality Certifications

Features

  • 1. High Reliablility and Best Price
    Proudly self-producing and rigorous testing, QSFPTEK is dedicated to delivering cost-effective products with high reliability and performance at trade price.
  • 2. Wide Application Scenarios
    Fully compatible with almost all Cisco devices. Ideal for long-haul networks, campus networks, metro networks.
  • 3. Protocols
    Compliant with IEEE 802.3ba, QSFP+ MSA, SFF-8436, SFF-8636.
  • 4. Quality Certifications
    Backed by CE, FCC, ROSH, ISO9001.

Applications

Scenario 1: 40GBASE-ER4 Connectivity with NIC

Related Products:

S7300-48X2Q4C, 48-Port Gigabit Ethernet L3 Campus SFP+ Switch, 48 x10GE SFP+, with 2 x40GE QSFP+ and 4 x100GE QSFP28 Uplinks, Support Stacking

LC UPC to LC UPC Duplex OS2 2.0mm PVC Fiber Optic Patch Cable 10m

Intel XL710-BM2 Based Network Interface Card, 40G Dual-Port QSFP+, PCIe 3.0 X 8, Half & Full Bracket

  

  

Scenario 2: 40GBASE-ER4 Connectivity with ODF

Related Products:

S7300-48X2Q4C, 48-Port Gigabit Ethernet L3 Campus SFP+ Switch, 48 x10GE SFP+, with 2 x40GE QSFP+ and 4 x100GE QSFP28 Uplinks, Support Stacking

LC UPC to LC UPC Duplex OS2 2.0mm PVC Fiber Optic Patch Cable 10m

 

Product details

Various Switch Tests

 

Every module is quality tested for compatibility in the multi-brand switches environment, which guarantees flawless operations.

 

 

 

Tested in The Host Device to Prove Interoperability

 

Every unit sold undergoes rigorous quality testing, to ensure compatibility in the target switch environment, guaranteeing perfect operation.

 

QSFPTEK Test Rack

 

 

Various Switch Tests

 

Every module is qualified through rigorous procedures and advanced equipment to ensure high-quality and reliable optical devices for you.

 

QSFPTEK Test Devices

 

 

40G QSFP+ Model Contrast Table

 

Part Number

QT-QSFP+-SR4

QT-QSFP+-IR4

QT-QSFP+-PSM4

QT-QSFP+-LR4

QT-QSFP+-LR4-20

QT-QSFP+-ER4

QT-QSFP+-ZR4

Image

Wavelength

850nm

CWDM

1310nm

CWDM

CWDM

CWDM

LWDM 1294~1310nm

Max Distance

150m

2km

10km

10km

20km

40km

80km

Cable Type

OM3/OM4 MMF

OS2 SMF

OS2 SMF

OS2 SMF

OS2 SMF

OS2 SMF

OS2 SMF

Connector

MPO/MTP-12

LC Duplex

MPO/MTP-12

LC Duplex

LC Duplex

LC Duplex

LC Duplex

Tx Power(dBm)

-7 ~ 1

-7 ~ 2.3

-6 ~ -1

-7 ~ 2.3

-4 ~ 2.3

-2.7 ~ 4.5

-2.7 ~ 4.5

Rx Sensitivity(dBm)

-9.5

-11.5

-14.4

-13.7

-11.5

-19

-28

Power Consumption

<0.7W

<2.5W

<2.5W

< 2.5W

<3.5W

<3.5W

<5W

Source

VCSEL + PIN

DFB + PIN

4xDFB + PIN

DFB + PIN

DFB + PIN

DFB + PIN

4xDFB + APD

Operating Temperature

0 to 70°C

0 to 70°C

0 to 70°C

0 to 70°C

0 to 70°C

0 to 70°C

0 to 70°C

Questions & Answers

Customer Reviews

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  • ALL (7)
  • Premium Service (2)
  • Excellent Quality (1)
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  • Customer Support (1)
  • Good Price (2)
  • Good Packaging (1)
  • Compatibility (3)
  • Fast Delivery (2)
  • Davies United States of America
    2025-06-27

    Used these with my Cisco switch — worked instantly without any issues. Also picked up some LC cables for easier setup. Great compatibility and performance!

    Transceivers typeQSFP-40G-ER4

    CompatibleCisco

    Verified Purchase

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  • Griffith A United States of America
    2025-01-17

    For the price, these 40G optical modules are a great fit. Having tried other brands as well, QSFPTEK is not far behind when comparing these other brands. Works seamlessly with my various network switches and was easy to set up.

    Transceivers typeQSFP-40G-ER4

    CompatibleCisco

    Verified Purchase

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    0

  • Lena United States of America
    2024-10-18

    This module works seamlessly with my Cisco C9500-24Y4C switch, and I was worried about compatibility before I purchased it. Sales Yanny provided me with a test report of the product, along with some other documentation, a great shopping experience.

    Transceivers typeQSFP-40G-ER4

    CompatibleCisco

    Verified Purchase

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    0

  • Travis United States of America
    2024-09-25

    The tech support and customer service team responded to my inquiries promptly and effectively. When I requested an adjustment to better suit our application, they immediately made the change without delaying the shipment. I'm familiar with your extensive product line—it's outstanding—and we will definitely keep you in mind for future needs.

    Transceivers typeQSFP-40G-ER4

    CompatibleCisco

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  • Quintion United States of America
    2023-03-07

    All items were delivered punctually and matched their description. We opted for the 40GBASE-ER4 modules suggested by the sales team and were pleased to find them at a great price on QSFPTEK. The server has been equipped with these modules and is operating flawlessly.

    Transceivers typeQSFP-40G-ER4

    CompatibleCisco

    Verified Purchase

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  • Brown United Kingdom
    2022-09-29

    Routerswitch offers this item at about 1w dollars, which is out of my budget. So I think a compatible one may be better. This module is coded to be compatible with Cisco equipment. Thanks to QSFPTEK.

    Transceivers typeQSFP-40G-ER4

    CompatibleCisco

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    1

  • Alexander L United States of America
    2022-05-19

    Really hassle-free customer support. Firstly I asked a bulk pricing for 40g er4 in live chat. Later we got connected on WhatsApp. The sales rep answered my questions on technical queries, patiently and professionally. Their sales deserve the title of an expert!

    Transceivers typeQSFP-40G-ER4

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Video

Resources

  • PDF Document
    QT-QSFP+-ER4 Datasheet.pdf
  • PDF Document
    Transceiver Module User Guide.pdf
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Cisco QSFP-40G-ER4 Compatible 40GBASE-ER4 QSFP+ 1310nm 40km Optical Transceiver Module

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Mark

2023-12-15
This product works well with my switch, and I plan to buy some DWDM transceivers from QT. Excellent value fo ct works well with my switch, and I plan to buy some DWDM transceivers from QT. Excellent valur money!

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Cisco QSFP-40G-ER4 Compatible 40GBASE-ER4 QSFP+ 1310nm 40km Optical Transceiver Module
US$ 419.00
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