QSFP-40G-ER4 Cisco Compatible 40G 40KM SMF QSFP Transceiver

Cisco
QSFP+
40G
Duplex
40 km
QSFP-40G-ER4 Cisco Compatible 40G 40KM SMF QSFP Transceiver

Cisco compatible QSFP-40G-ER4 - Key Features

  • Compatibility: Cisco
  • Media Type: Single-Mode Fiber (SMF)
  • Connector: Double LC/UPC
  • Fiber Count: Duplex
  • Maximum Distance: 40 km
  • Guaranteed Link Budget: 19 dB
  • Tx Wavelenght: CWDM 4 Ch
  • Supported Data Rate: 44.8 Gbps
  • DDM/DOM: Supported
  • Temperature Range: Standard 0°-70°C

Cisco QSFP-40G-ER4 Price

SKUSKU:40G-QSFP-40-CI
Lead timeMade to Order - 2 Weeks
Standard recommended retail price ex VAT:
305.24
Choice of 0+
Telecoms & Integrators Globally

Cisco compatible QSFP-40G-ER4 Specifications

Form Factor
QSFP+
Modulation
NRZ (Non-Return to Zero)
Media Type
Single-Mode Fiber (SMF)
Connector
Double LC/UPC
Fiber Count
Duplex
Maximum Distance
40 km
Guaranteed Link Budget
19 dB
TX Wavelenght
4-channel CWDM (1271/1291/1311/1331 nm)
RX Wavelenght
4-channel CWDM (1271/1291/1311/1331 nm)
Supported Data Rate
44.8 Gbps
Supportet Ethernet Applications
40G Ethernet (41.25Gbps)
Optical Transport Network (OTN) Applications
OTU3 (43.01Gbps), OTU3e2 (44.58Gbps)
SDH/SONET Standards
STM-256 (39.81 Gbps)
DDM/DOM
Supported
Transmitter Type
DFB Laser
Tx Wave Bandwidth
4 WDM Seperated 1310nm Lanes (13 nm (1271, 1291, 1311, 1331))
Average Launch Power (Min) Each Lane
-2.7 dBm
Average Launch Power (Max) Each Lane
4.5 dBm
Receiver Type
APD Photodiode
Average Receiver Sensitivity (Min) Each Lane
-19 dBm
Average Receiver Sensitivity (Max) Each Lane
-7 dBm
Receiver Overload
-7 dBm
Temperature Range
Standard 0°-70°C
Storage Temperature
-40° to 85°C
Relative Humidity
5 to 85%
Power
+3.3V single power supply
Compliance
IEEE 802.3ba, CE, Class 1 FDA and IEC60825-1 Laser Safety Compliant, INF-8438i, QSFP+ MSA, RoHS, SFF-8436

Cisco compatible QSFP-40G-ER4 Datasheet

v2

Complete technical specifications and product details

Updated:Jan 16, 2026Format:PDF

Cisco compatible QSFP-40G-ER4 Description

Our Compatible Cisco QSFP-40G-ER4 QSFP+ transceiver is based on our 40G-QSFP-40 product, which has the same parameters and is manufactured in accordance with the same industry standards as its OEM counterpart. Our compatible module version is designed for operation over a Double Fiber Single-Mode Fiber (SMF) optical cable. It has a minimum guaranteed optical budget of 19 dB, which typically is enough to reach about 40 km. Howev359er, distance is only an indicative parameter calculated for identification comfort. Finally, we calculate distance while keeping in mind the minimum (guaranteed) optical budget and the average attenuation of optical cabling in the industry. Our Cisco QSFP-40G-ER4 compatible transceiver uses a high-quality DFB Laser transmitter operating at 1271, 1291, 1311, 1331 nm nominal wavelength and a 1271, 1291, 1311, 1331 nm APD Photodiode receiver. This module supports DDM/DOM optical diagnostics and provides diagnostic data about the current operating conditions. This compatible module has a Double LC connector and module is designed for operation in standard temperature networking environments ranging from 0°-70°C. The transceiver chipset supports data rates ranging from up to 44.8 Gbps and such applications as 40G Ethernet (41.25Gbps), STM-256 (39.81 Gbps), OTU3 (43.01Gbps), OTU3e2 (44.58Gbps). It is important to note that the mentioned application support will vary depending on the port where the module will be used, and it supported applications as well as module speed configuration during ordering process, but we can ensure that our module will support at least the same functionality as its OEM counterpart. This is a multi-purpose transceiver that can be used in a variety of different places in today's networking. As a result, Internet Service Provider (ISP) Fiber to the Home Aggregation and Backbone, Mobile Operator Core Networks and Mobile Backhaul and Data Center networking site interconnections are the most popular applications for this product.

Our compatible Cisco QSFP-40G-ER4 module is CE/RoHS certified, it meets product safety standards, and is compliant with QSFP Multi Source Agreement (MSA) SFF-8436 industry standard. To ensure smooth operation, we have completed compatibility tests for this module with the most recent platforms of Cisco networking equipment, allowing us to encode transceiver EEPROM memory to be compatible with and work seamlessly in Cisco platforms. We are committed to quality, therefore before delivering our products, we conduct stringent quality inspections that include optical parameter measurements, connector cleanliness tests, and EEPROM memory data validation tests. If you have any questions, please Contact us. We will gladly learn about your needs and recommend the best compatible products from our portfolio.