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header-product StarTech QSFP+ 40GBASE-SR4 QSFP-40G-CSR4-ST 40GbE Multimode MPO 850nm 300–400m DDM
61.49 €

StarTech QSFP+ 40GBASE-SR4 QSFP-40G-CSR4-ST 40GbE Multimode MPO 850nm 300–400m DDM

StarTech QSFP+ 40GBASE-SR4 QSFP-40G-CSR4-ST Photo 1
StarTech QSFP+ 40GBASE-SR4 QSFP-40G-CSR4-ST Photo 2
StarTech QSFP+ 40GBASE-SR4 QSFP-40G-CSR4-ST Photo 3
StarTech QSFP+ 40GBASE-SR4 QSFP-40G-CSR4-ST Photo 4
StarTech QSFP+ 40GBASE-SR4 QSFP-40G-CSR4-ST Photo 1
StarTech QSFP+ 40GBASE-SR4 QSFP-40G-CSR4-ST Photo 2
StarTech QSFP+ 40GBASE-SR4 QSFP-40G-CSR4-ST Photo 3
StarTech QSFP+ 40GBASE-SR4 QSFP-40G-CSR4-ST Photo 4
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StarTech QSFP+ 40GBASE-SR4 QSFP-40G-CSR4-ST 40GbE Multimode MPO 850nm 300–400m DDM

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Short description

Compatible StarTech QSFP+ transceiver (model QSFP-40G-CSR4-ST) for 40GbE networks using multimode fiber. Supports 40GBASE-SR4 at 40,000 Mbit/s over MPO connector at 850 nm with digital diagnostic monitoring (DDM). Intended for short-range links up to 300–400 m depending on fiber type. Compact silver module, SFP+ interface, MTBF ~95,832,027 h, ideal for data center aggregation and high-speed switching.
Available for order: 13 pcs.
Warranty: 2 Years
SKU: 4260537
Manufacturer: StarTech
free shipment

Cheapest delivery:

Venipak Locker LV

Pick-up points

Venipak Locker LV

Cost

1.89 €

Deliver

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Customer service center
2b. Kengaraga str., Riga, Latvia, LV-1063
23.07.2026 {{selectedOffer.officeDeliveryString}}
free
Courier Delivery Please note that in case of a large parcel additional delivery costs may apply!
28.07.2026 {{selectedOffer.courierDeliveryString}}
From 4.99 € (Weight: 0.04 kg)
Parcel couriers
Venipak Locker LV / Latvijas Pasts pakomāts / Unisend LV / DPD Paku skapis / Omniva LV / Venipak Pickup LV / Latvijas Pasts nodaļa
28.07.2026 {{selectedOffer.parcelStationDeliveryString}}
From 1.89 €
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Product information

Description

The StarTech QSFP+ 40GBASE-SR4 QSFP-40G-CSR4-ST is a compatible QSFP+ transceiver module designed for 40GbE multimode fiber links. It operates at 850 nm over an MPO connector and supports the 40GBASE-SR4 standard with a maximum data rate of 40,000 Mbit/s. The module offers digital diagnostic monitoring (DDM) for real-time monitoring of optical and electrical parameters and is intended for short-range connections with a maximum transfer distance of up to 300–400 m depending on the multimode fiber type. The compact silver enclosure is lightweight and suited for use in high-density data center aggregation and high-speed switching environments.

Advantages

This QSFP+ transceiver provides a high-speed 40GbE interface in a compact form factor while maintaining compatibility with standard multimode MPO cabling. Integrated digital diagnostic monitoring enables continuous insight into module status and link conditions. The module’s optical design supports short-range multimode links up to the stated distance range, enabling consolidation of high-bandwidth connections in aggregation and switching layers. Its silver, lightweight construction aids hot-swap handling and rack-level deployment in dense installations.

Suitable for

  • Data center aggregation switches and spine-leaf fabrics
  • High-density optic uplinks between switches and servers
  • Short-range multimode fiber connections within campus or enterprise buildings
  • 40GbE link deployments requiring MPO connectivity and DDM

Key specifications

  • Maximum data transfer rate: 40,000 Mbit/s
  • Optical standard: 40GBASE-SR4 (multimode)
  • Wavelength: 850 nm
  • Connector type: MPO
  • Maximum transfer distance: up to 300–400 m (dependent on multimode fiber type)
  • Digital Diagnostic Monitoring (DDM): supported
  • Form factor: QSFP+ transceiver
  • Colour: Silver
  • Weight: 0.0375 kg

How to use

Install the QSFP-40G-CSR4-ST module into a compatible QSFP+ port on a network switch or optical appliance, ensuring the device is powered down or supports hot-swap insertion according to the host equipment instructions. Connect a compatible MPO multimode fiber cable to the module’s MPO connector, observing correct polarity and fiber type to achieve the stated distances. Monitor the module’s DDM output via the host device management interface to verify optical power, temperature, and other diagnostic parameters. Follow your switch or server documentation for link activation and port configuration to enable 40GBASE-SR4 operation.

Usage recommendations

Use certified multimode fiber (OM3/OM4 as applicable) and MPO cables to reach the expected link distances; verify fiber type and link loss before installation. Ensure the host equipment firmware and driver support third-party QSFP+ modules and confirm DDM visibility through management tools. Handle the module using ESD-safe practices and protect the MPO connector with dust caps when not connected.

Specifications

Maximum data transfer rate:
40000 Mbit/s
Maximum transfer distance:
400 m
Weight:
0.0375 kg
Fiber optic connector:
MPO
Product colour:
Silver
All features
Interface type:
SFP+
Compatible products:
QSFP-40G-CSR4
Number of products included:
1 pc(s)
Brand compatibility:
Cisco
SFP transceiver type:
Fiber optic
Multi-mode fiber (MMF) supported:
Yes
SFP transceiver standard:
SR4

Network

Maximum data transfer rate:
40000 Mbit/s
Fiber ethernet cabling technology:
40GBASE

Ports & interfaces

Fiber optic connector:
MPO

Performance

Maximum transfer distance:
400 m
Mean time between failures (MTBF):
95832027 h
Wavelength:
850 nm

Weight & dimensions

Weight:
0.0375 kg
Height:
8.5 mm
Width:
122 mm
Depth:
18.6 mm

Logistics data

Master (outer) case height:
35 mm
Master (outer) case width:
120 mm
Master (outer) case length:
205 mm
Products per master (outer) case:
1 pc(s)
Harmonized System (HS) code:
85369010

Features

Product colour:
Silver
Hot-swap:
Yes
Digital Diagnostics Monitoring (DDM):
Yes

Packaging data

Package weight:
60 g
Package depth:
205 mm
Package height:
35 mm
Package width:
120 mm

Sustainability

Sustainability certificates:
RoHS, CE

Description

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Customer reviews

Customer questions

FAQ

How much does the StarTech QSFP+ 40GBASE-SR4 QSFP-40G-CSR4-ST cost, and is it available for purchase?

The price is 61.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 13 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 23.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

What payment options are available?

AiO.lv offers several payment methods: Bank transfer. All transactions are 100% secure and encrypted.

Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

What is the warranty period?

All StarTech products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized StarTech service centers and through AiO.lv

Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. We will assist with consultation, warranty claim processing, and coordination with certified service centers.

How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: maximum data transfer rate, maximum transfer distance, weight, fiber optic connector, product colour, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

Where can I download the instructions for StarTech QSFP+ 40GBASE-SR4 QSFP-40G-CSR4-ST?

You can download the instructions in PDF format from the “Instructions” section on the product description page. The file contains complete information about installation, setup, and usage.
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