# Transceiver Module Cisco QSFP-40G-CSR-S Fiber optic

**URL:** https://aio.lv/en/product--cisco-qsfp-40g-csr-s--3084725
**Data updated:** 2025-12-29 10:45 (EET)
**Category:** Fiber Optic Cables
**Manufacturer:** Cisco
**Manufacturer code:** QSFP-40G-CSR-S=
**EAN:** 0889728098663
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 2 078.99 €
**Prices and availability valid until:** 2026-08-03 23:59
**Price without VAT (21%):** 1 718.17 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--cisco-qsfp-40g-csr-s--3084725

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 20.07.2026 | free |
| Pickup points | 23.07.2026 | 1.89 EUR |
| Courier delivery to door | 23.07.2026 | 4.99 EUR |

## Summary description

The Cisco QSFP-40G-CSR-S is a high-performance fiber optic transceiver module designed for data rates up to 40000 Mbit/s. It features a QSFP interface, ensuring compatibility with various networking equipment. This module is ideal for high-speed data center applications, providing reliable and efficient connectivity for demanding environments.

## Long description

The QSFP-40G-CSR-S is a pluggable 40G fiber optic transceiver module with a QSFP form factor and duplex LC connector interface for use over multimode fiber (MMF). It supports 40GBASE-CSR operation by running four 10 Gbit/s lanes on four wavelengths over existing duplex OM3 or OM4 MMF, enabling reuse of 10 Gigabit duplex MMF infrastructure while keeping the same supported link distances.
Advantages
This Cisco QSFP-40G-CSR-S transceiver supports 40 Gbit/s aggregation using four 10G lanes, works with laser-optimized OM3 and OM4 multimode fibers, and provides link reach of up to 300 m on OM3 and 400 m on OM4. It uses standard LC duplex connectors for straightforward integration into existing duplex MMF cabling and offers a QSFP interface for compatibility with QSFP ports on switches and routers. The module does not support FCoE.
Suitable for
 Data center uplinks and aggregation where 40 Gigabit Ethernet is required over MMF
 Migration from 10G to 40G while reusing existing duplex OM3/OM4 cabling
 High-density switch-to-switch links using QSFP ports and LC duplex connectors
Key specifications
 Standard: 40GBASE-CSR
 Data rate: 40 Gbit/s (4 × 10 Gbit/s lanes)
 Connector: Duplex LC
 Fiber type: Multimode (OM3 / OM4)
 Typical reach: 300 m on OM3, 400 m on OM4
 Form factor: QSFP
 FCoE support: Not supported
How to use
Insert the QSFP-40G-CSR-S module into a compatible QSFP port on your switch or router, and connect the duplex LC patch cables to the multimode fiber links. Ensure the switch or host transceiver port is configured for 40G operation and that the connected fiber is OM3 or OM4 rated for the required distance. Verify link status and speed through the device management interface.
Usage recommendations
Use laser-optimized OM3 or OM4 duplex multimode fiber and high-quality LC patch cords. Confirm QSFP port compatibility with Cisco devices and check firmware or driver requirements. Do not use this module for FCoE traffic as it is not supported.

## Specifications

| Feature | Value |
|---|---|
| Interface type | QSFP |
| Maximum data transfer rate | 40000 Mbit/s |
| Fiber optic connector | LC |
| Maximum transfer distance | 400 m |
| SFP transceiver type | Fiber optic |
| Multi-mode fiber (MMF) supported | Yes |

## FAQ

### How much does the Transceiver Module Cisco QSFP-40G-CSR-S cost, and is it available for purchase?

The price is 2,078.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 32 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 20.07.2026 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: Cash payment, Bank transfer, Bank cards on-line, Apple Pay, Google Pay, Leasing for legal entities. 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 Cisco 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 Cisco 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. More information about warranty service: https://aio.lv/en/warranty

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