AT-QSFPSR4LC Allied Telesis Compatible 40G QSFP 2KM Transceiver

# Key Highlights
  • Type: QSFP (Quad Small Form-factor Pluggable)
  • Compatibility: Allied telesis compatible
  • Tx Wavelength: 1310 nm.
  • Rx Wavelength: 1310 nm.
  • Media Type: Multi-Mode Fiber (MMF), Single-Mode Fiber (SMF)
  • Optical Budget: 4.5 dB (SMF) / 2.5 dB (MMF)
  • Max. Distance: 150m, 2km
  • Data Rate: 39.81 – 44.8 Gbps
  • Temperature:Standard 0°-70°C
# Pricing & Ordering
SKU: 40G-QSFP-2.1-AT


Standard recommended retail price without VAT.

Lead Time: Below 1 Week in EU Countries
# Quality Assurance

Because of our comprehensive Testing Program, we are confident on quality of our products. Such approach empower us to cover all our products with:

# Key Technical Data
Media Type:

Multi-Mode Fiber (MMF), Single-Mode Fiber (SMF)

Maximum Distance:


Transceiver Type:


TX Wavelength:

1310 nm.

RX Wavelength:

1310 nm.

Minimum Optical Budget:

4.5 dB (SMF) / 2.5 dB (MMF)

Supported Data Rate:

39.81 – 44.8 Gbps

Supported Applications:

40G Ethernet (41.25Gbps), STM-256 (39.81 Gbps), OTU3 (43.01Gbps), OTU3e2 (44.58Gbps)



Temperature Range:

Standard 0°-70°C


Double LC

Tx Wavelength Bandwidth:

4 WDM Seperated 1310nm Lanes (13nm (1271, 1291, 1311, 1331))

Rx Wavelength Bandwidth:

4 WDM Seperated 1310nm Lanes (13nm (1271, 1291, 1311, 1331))

Minimum Transmitting Power:

Each Lane SMF: -7 dBm / MMF: -7 dBm

Maximum Transmitting Power:

Each Lane SMF: 2.3 dBm / MMF: 2.3 dBm

Receiver Sensitivity:

Each Lane SMF: -11.5 dBm / MMF: -9.5 dBm

Receiver Overload:

Each Lane SMF: 2.3 dBm / MMF: 2.3 dBm

Transmitter Type:

DFB Laser

Receiver Type:

PIN photodiode


+3.3V single power supply




CE, Class 1 FDA and IEC60825-1 Laser Safety Compliant, INF-8438i, RoHS, SFF-8436

# Product Documentation
Multi-Vendor MSA Compatible 40G-QSFP-2.1 QSFP Universal Datasheet

Allied telesis Compatible AT-QSFPSR4LC QSFP Universal Module is based on our product 40G-QSFP-2.1. When You will order it will be encoded with Allied telesis code and it will be labeled with part number: 40G-QSFP-2.1-AT, where AT means Allied telesis Compatible. Above You can download datasheet of our 40G-QSFP-2.1 product.

# Product Description

Our Compatible Allied Telesis AT-QSFPSR4LC QSFP+ transceiver is based on our 40G-QSFP-2.1 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) or Multi-Mode Fiber (MMF) optical cable. It has a minimum guaranteed optical budget of 2.5dB(MMF)/4.5dB(SMF), which typically is enough to reach about Max. 150m over MMF (OM4) or 2km over SMF. However, 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 Allied Telesis AT-QSFPSR4LC compatible transceiver uses a high-quality DFB Laser transmitter operating at 1310 nm nominal wavelength and a 1310 nm PIN 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 Allied Telesis AT-QSFPSR4LC 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 Allied Telesis networking equipment, allowing us to encode transceiver EEPROM memory to be compatible with and work seamlessly in Allied Telesis 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.