---
title: RX-Only BiDi Transceivers for Passive Network Visibility
description: Discover the benefits of RX-only BiDi transceivers for passive network monitoring, enhancing security, reducing risks, and ensuring precise data acquisition in high-speed environments.
image: https://insights.profitap.com/hubfs/RX-only-v1.jpg
---

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# RX-Only BiDi Transceivers for Passive Network Visibility

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Profitap RX-only BiDi transceivers are engineered for passive network monitoring, where transmit capability back into the network poses a liability. By completely removing the transmit path, these modules minimize risk, reduce power consumption, and guarantee unidirectional data flow.

 

**What makes RX-only transceivers different**

### *One-Way optical communication*

RX-Only BiDi transceivers are different from standard transceivers because the transmit (TX) function is disabled at the hardware level. The components required to power and drive the TX laser are physically removed. As a result, the module cannot transmit under any circumstances. This creates accurate one-way optical communication, preventing signal injection, accidental link negotiation, and any impact on the production network.

These transceivers are indispensable for sensitive applications, such as monitoring in regulated industries and oversight of critical infrastructure.

![](https://insights.profitap.com/hs-fs/hubfs/undefined-Jan-07-2026-01-35-03-5281-PM.png?width=700&height=394&name=undefined-Jan-07-2026-01-35-03-5281-PM.png)

### *Designed for passive monitoring*

RX-only transceivers were specifically designed to receive network traffic, making them ideal for exclusively:

- **Deterministic operation:** Ensures predictable port behavior.
- **Safety:** Ideal for non-intrusive monitoring.
- **Precision:** Guarantees clean packet acquisition for subsequent filtering, aggregation, and distribution.

### *Bi-directional transmission over standard duplex LC fiber*

Both RX-only modules utilize bi-directional (BiDi) optics over conventional duplex LC multimode fiber. This is achieved by transmitting traffic on each fiber at distinct wavelengths (approximately 850 nm and 900–910 nm).

This BiDi approach provides significant advantages:

- **Infrastructure reuse:** Compatible with existing OM3 and OM4 fiber deployments.
- **Simplified cabling:** Removes the requirement for MPO or ribbon cabling.
- **Ease of installation:** Streamlines cabling within monitoring racks and data centers.

 

## **RX-Only monitoring at 40G**

The [PT-40G-SR-BD-RX](https://www.profitap.com/transceivers/?rx-only=true) is a QSFP+ receive-only transceiver designed for environments where 40G monitoring is still widely deployed. 

| [![](https://insights.profitap.com/hs-fs/hubfs/undefined-Jan-07-2026-01-35-03-0335-PM.png?width=250&height=121&name=undefined-Jan-07-2026-01-35-03-0335-PM.png)](https://www.profitap.com/transceivers/?rx-only=true) | - Aggregate receive bandwidth of 40 Gbps - Duplex LC BiDi receive-only optics - Reach up to 100 m on OM3 and 150 m on OM4 - Power consumption up to 3.5 W - Operating temperature range from 0 to 70 °C |
| --- | --- |

[Click here to open the datasheet.](https://www.profitap.com/wp-content/uploads/PT-40G-SR-BD-RX-Datasheet.pdf)

### **Typical use cases**

- Passive monitoring of 40G backbone links
- Optical TAP outputs connected to packet brokers
- Aggregation of multiple 40G feeds into a Packet Broker
- Cost-effective monitoring in transitional data center environments

## **RX-Only Monitoring at 100G**

The [PT-100G-SR-BD-RX](https://www.profitap.com/transceivers/?rx-only=true)extends the RX-only concept to modern 100G monitoring deployments using QSFP28 interfaces. 

| ![](https://insights.profitap.com/hs-fs/hubfs/undefined-Jan-07-2026-01-35-04-0495-PM.png?width=250&height=121&name=undefined-Jan-07-2026-01-35-04-0495-PM.png) | - Aggregate receive bandwidth of 100 Gbps - Two independent RX-only optical channels - Duplex LC multimode fiber - Reach up to 70 m on OM3, 100 m on OM4, and 150 m on OM5 - Support for KP4 FEC at the host level - Power consumption up to 4 W - Digital diagnostics for operational visibility |
| --- | --- |

[Click here to open the datasheet.](https://www.profitap.com/wp-content/uploads/PT-100G-SR-BD-RX-Datasheet.pdf)

### **Typical use cases**

- High-speed data center spine monitoring
- Security analytics platforms operating at 100G
- Optical TAP outputs feeding a Network Packet Broker 
- Lawful interception and compliance-driven monitoring environments
- IDS, NDR, and traffic forensics solutions

 

## **Why RX-Only transceivers matter**

RX-only optics offer advantages that standard transceivers cannot provide in monitoring environments, including physical enforcement of one-way traffic flow, reduced operational and security risks, simplified compliance with regulatory requirements, fewer active optical components, lower failure rates, and an optimized cost structure for passive monitoring deployments.

## **Conclusion**

Profitap RX-only BiDi transceivers are not modified production optics. They are purpose-built components explicitly designed for passive monitoring.

- PT-40G-SR-BD-RX enables reliable RX-only monitoring at 40G
- PT-100G-SR-BD-RX enables scalable RX-only monitoring at 100G

In network visibility architectures, the objective is to receive traffic. Transmitting traffic is a risk. RX-only transceivers eliminate that risk by design.

[![SFP Rx-only](https://no-cache.hubspot.com/cta/default/2954816/interactive-204546299537.png)](https://insights.profitap.com/hs/cta/wi/redirect?encryptedPayload=AVxigLKhLoiWPyPOHijEHigrcYL40Mnfp2HEfGbF%2FqQI%2FbYZFoSLlW32hY1m%2BTbZZSrTev3I%2FDIZGmBLVwhTQQu2Y7rC7PBsgFkx1z0XLOMNGZy69iEXPvr8sz23GlNLUF8it3USn%2FYmMJ1bLISNfx4gYW263r8T%2FvG6%2B06F8tCcn1wIW3q1BJru0tgd&webInteractiveContentId=204546299537&portalId=2954816)

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by [Profitap](https://insights.profitap.com/author/profitap) |  Jan 16, 2026  | [Network Monitoring](https://insights.profitap.com/topic/network-monitoring)

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