SFP-OC3-SR Cisco Small Form Factor Pluggable 155Mbps Transceiver

Overview of the Cisco Transceiver

The SFP-OC3-SR Cisco Small Form Factor Pluggable 155Mbps Transceiver is a high-performance optical networking module designed for SONET/SDH OC-3 (Optical Carrier level 3) communication systems. Operating at a data rate of 155.52 Mbps, this transceiver is widely deployed in enterprise, telecom, and service provider environments where stable, short-reach optical connectivity is required over multimode fiber infrastructure. Built to Cisco’s rigorous interoperability and quality standards, the module supports seamless integration into compatible networking hardware while ensuring reliable optical signal transmission across short-distance links.

Specifications of Transceiver Module

• Brand: Cisco
• Part Number: SFP-OC3-SR
• Product Type: SFP Transceiver Module

Technical Information

• Form Factor: Small Form-Factor Pluggable (SFP).
• Data Rate: 155.52 Mbps.
• Line Rate: OC-3 / STM-1.
• Wavelength: 1310 nm.
• Fiber Type: Single-Mode Fiber (SMF).
• Max Distance: Up to 2 kilometers.
• Connector Type: LC Duplex.
• Polishing Type: Physical Contact (PC).
• Transmitter Power: -15 to -8 dBm.
• Receiver Sensitivity: Less than -23 dBm.
• Supply Voltage: 3.3V single power supply.
• Compliance: SFP MSA and GR-253-CORE compliant.
• Digital Diagnostics: Supports SFF-8472 digital optical monitoring (DOM).

Compatibility

• Network Protocols: Fully supports SONET, SDH, and ATM standards.
• Interface Types: Built for Packet-over-SONET/SDH (POS) interfaces.
• Hardware Slot: Fits into any standard SFP mini-GBIC slot.
• Cisco Platforms: Compatible with Cisco 7600 and 7304 routers.
• Module Support: Integrates with Cisco Shared Port Adapters (SPA).
• Switch Support: Compatible with Cisco Catalyst 6500 series switches.
• Vendor Compatibility: Works with MSA-compliant hardware from other vendors.
• Software Support: Requires compatible Cisco IOS software versions.

SFP-OC3-SR Cisco Small Form Factor Pluggable Transceiver 

The architecture of the SFP-OC3-SR module is based on the Small Form Factor Pluggable (SFP) standard, enabling hot-swappable functionality and compact integration into networking devices such as routers, switches, and multiplexers. This OC-3 SR (Short Reach) variant is specifically optimized for multimode fiber (MMF) applications, typically operating at an 850nm wavelength.

SONET/SDH OC-3 Network Compatibility

The SFP-OC3-SR transceiver is designed to support SONET (Synchronous Optical Network) and SDH (Synchronous Digital Hierarchy) OC-3 standards, making it suitable for legacy and modern optical transport networks. OC-3 operates at a nominal line rate of 155.52 Mbps and is commonly used for voice, data, and video transport across metropolitan and campus networks.

Optical Performance and Transmission Capabilities

The SFP-OC3-SR module delivers reliable optical transmission performance over short-range distances, typically up to 2 kilometers depending on fiber quality and system configuration. It is optimized for multimode fiber environments, making it ideal for intra-building and campus connectivity.

Signal Integrity Features

The module incorporates advanced signal conditioning technology to minimize jitter, attenuation, and optical dispersion. Built-in diagnostic monitoring ensures real-time performance tracking and fault detection for enhanced network reliability.

Enterprise and Service Provider Applications

The SFP-OC3-SR Cisco transceiver is widely deployed in enterprise campus networks, telecom infrastructure, and service provider backbones where OC-3 connectivity remains essential for legacy system integration and low-latency communication.

Industry Deployment Scenarios

Many financial institutions, government agencies, and healthcare organizations rely on OC-3 optical modules for secure and stable data transport. The SFP-OC3-SR ensures backward compatibility with existing SONET infrastructures while maintaining Cisco-grade performance standards.

Physical Design and Hot-Swappable Functionality

One of the most significant advantages of the SFP-OC3-SR module is its hot-swappable design, allowing network administrators to install or replace the transceiver without powering down the system. This reduces downtime and enhances operational efficiency in mission-critical environments.

Fiber Optic Technology and SR (Short Reach) Optimization

The SR designation in SFP-OC3-SR indicates Short Reach optimization, specifically engineered for multimode fiber environments. This makes it suitable for shorter distance transmissions within buildings or campus infrastructures where long-haul single-mode fiber is not required.

850nm VCSEL Technology

The vertical-cavity surface-emitting laser (VCSEL) technology used in this module ensures high-speed optical transmission with minimal signal distortion. The 850nm wavelength is ideal for multimode fiber propagation, balancing performance and cost efficiency.

Cisco Compatibility and Interoperability Standards

The SFP-OC3-SR transceiver is engineered for seamless integration with Cisco networking equipment that supports SFP interfaces. It adheres to Multi-Source Agreement (MSA) standards, ensuring compatibility across a wide range of networking platforms.

Interoperability Features

The module’s EEPROM allows automatic recognition by Cisco systems, enabling plug-and-play deployment without manual configuration in most cases. This reduces installation complexity and ensures faster provisioning in large-scale networks.

Digital Diagnostics Monitoring (DDM) Capabilities

Many versions of the SFP-OC3-SR transceiver include Digital Diagnostics Monitoring (DDM), also known as DOM (Digital Optical Monitoring), which provides real-time insight into operational parameters. These diagnostics help network engineers proactively detect potential failures and maintain optimal system performance.

Reliability, Lifecycle

The SFP-OC3-SR transceiver is designed for long operational lifecycles in enterprise and carrier environments. Its solid-state construction ensures minimal failure rates and consistent optical performance over extended periods.

Advantages of SFP-OC3-SR Cisco Transceivers

The SFP-OC3-SR module provides multiple advantages for organizations relying on OC-3 level connectivity. Its balance of performance, reliability, and compact design makes it an essential component in optical networking ecosystems.

Comparison with Other Optical Transceivers

Compared to higher-speed SFP modules such as Gigabit or 10G transceivers, the SFP-OC3-SR is optimized for lower bandwidth applications where stability and compatibility with legacy systems are more important than raw speed.

Telecommunication and WAN Integration

In wide area network (WAN) deployments, the SFP-OC3-SR module serves as a stable interface between optical transport systems and enterprise routing infrastructure. It is especially valuable in hybrid environments where legacy SONET systems coexist with modern IP-based networks.

Environmental and Operational Conditions

The SFP-OC3-SR module is designed to operate in a wide range of environmental conditions, making it suitable for controlled data centers and telecom facilities alike.