# Optical Fiber Attenuator CBO SFA21BK7 Singlemode 7 dB LC Simplex

**URL:** https://aio.lv/en/product--blueoptics-sfa21bk7--4467309
**Data updated:** 2026-02-12 14:09 (EET)
**Category:** Fiber Optic Cables
**Manufacturer:** BlueOptics
**Manufacturer code:** SFA21BK7
**EAN:** 4063232044620
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 29.99 €
**Prices and availability valid until:** 2026-07-21 23:59
**Price without VAT (21%):** 24.79 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--blueoptics-sfa21bk7--4467309

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 23.07.2026 | free |
| Pickup points | 28.07.2026 | 1.89 EUR |
| Courier delivery to door | 28.07.2026 | 4.99 EUR |

## Summary description

Inline optical fiber attenuator CBO SFA21BK7 for singlemode networks providing 7 dB attenuation. Features an LC simplex connector, compact housing for rack or field installations, and is used to reduce signal power to prevent receiver overload or to balance link budgets. Suitable for testing, telecom and data center applications requiring precise, fixed attenuation.

## Long description

Inline optical fiber attenuator CBO SFA21BK7 Singlemode 7 dB LC Simplex is a fixed, precision optical attenuator designed for singlemode networks. The device provides 7 dB attenuation through an LC simplex connector in a compact housing suitable for rack-mounted patch panels or field installations. It is intended to reduce optical power to prevent receiver overload, balance link budgets, and support testing procedures in telecom and data center environments.
Advantages
The attenuator offers a stable, repeatable attenuation value of 7 dB in a small form factor compatible with LC simplex ports. Its passive design requires no power and ensures low insertion loss aside from the specified attenuation, while maintaining back reflection characteristics appropriate for singlemode links. The compact housing simplifies deployment in patch panels and field boxes, and the standardized LC interface provides broad compatibility with common singlemode transceivers and patch cords.
Suitable for
 Balancing optical link budgets in telecom and enterprise networks
 Preventing receiver saturation in high-power singlemode links
 Testing and measurement during installation and maintenance
 Use in data center patch panels and fiber distribution frames
Key specifications
 Attenuation: 7 dB fixed
 Fiber type: singlemode
 Connector: LC simplex
 Insertion loss: specified attenuation plus minimal additional loss
 Return loss: suitable for singlemode applications
 Form factor: compact inline housing for panel or field use
 Operating environment: designed for telecom and data center installations
How to use
Insert the LC simplex connector of the attenuator between the transmitting fiber and the receiving device or patch cord, ensuring clean connectors and proper alignment. The unit is passive and provides a fixed 7 dB reduction of optical power immediately upon insertion. Verify link performance after installation with appropriate test equipment and replace protective caps when the attenuator is not in use to prevent contamination.
Usage recommendations
Prior to installation, clean connector endfaces with appropriate fiber cleaning tools and inspect with a microscope if available. Use the attenuator when measured optical power approaches or exceeds receiver specifications, or when you need to equalize power levels between channels. Avoid excessive bending or mechanical stress on the inline housing and connectors to maintain optical performance.

## FAQ

### How much does the Optical Attenuator CBO SFA21BK7 7 dB LC Simplex cost, and is it available for purchase?

The price is 29.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 73 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 BlueOptics 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 BlueOptics 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

## Image

https://aio.lv/img/cache/product/4467309/59856745_large.webp