1.25G Dual-Port BiDi cSFP 20km Industrial TX1310/RX1490: 1.25G-cSFP-21-ADI

Our EDGEOPTIC 1.25G-cSFP-21-ADI is a multi-vendor compatible industrial-grade dual-port compact SFP optical module engineered for demanding deployments utilizing the 1310/1490nm wavelength scheme. This cSFP transceiver integrates two independent BiDi (Bidirectional) channels within a single standard SFP footprint, providing doubled port density for Gigabit Ethernet networks operating in harsh environmental conditions.

The 1.25G-cSFP-21-ADI operates with both channels transmitting at 1310nm wavelength and receiving at 1490nm, supporting data rates from 1.063 to 1.25 Gbps per channel. Each channel employs BiDi technology with WDM (Wavelength Division Multiplexing) to deliver full-duplex communication over individual fiber strands. This module requires its complementary counterpart, the 1.25G-cSFP-21-BDI (TX1490/RX1310), to complete bidirectional optical links. The 1310/1490nm wavelength pairing offers an alternative to the 1310/1550nm scheme, providing flexibility for network architectures where specific wavelength allocation or coexistence with PON systems is required.

The extended operating temperature range of -45 to +85°C qualifies this transceiver for industrial and outdoor applications where commercial-grade modules would fail. From sub-zero winter conditions in roadside cabinets to elevated temperatures in industrial control rooms, the 1.25G-cSFP-21-ADI maintains consistent optical performance throughout its entire thermal specification.

The transceiver employs FP (Fabry-Perot) laser transmitters paired with PIN photodiode receivers for each channel, with components selected and validated for industrial temperature operation. With transmit power ranging from -9 to +3 dBm and receiver sensitivity of -23 dBm, the module provides a guaranteed 14 dB optical link budget supporting transmission distances up to 20 kilometers over standard single-mode fiber. The receiver operates within a focused 20nm bandwidth window (1480-1500nm), optimized for 1490nm wavelength reception. As always, actual achievable distance depends on fiber plant characteristics, connector quality, and cumulative splice losses.

The 1.25G-cSFP-21-ADI features a Double LC/UPC connector interface with two separate optical ports integrated into the compact housing. The electrical interface conforms to CSFP MSA Option 2 specifications, ensuring compatibility with industrial networking equipment from multiple vendors supporting compact SFP modules.

Digital Diagnostic Monitoring (DDM/DOM) is fully supported, providing real-time access to critical operational data including transmitted and received optical power for both channels, module temperature, laser bias current, and supply voltage. Temperature telemetry is particularly valuable in industrial installations for verifying environmental conditions remain within acceptable bounds.

Standards compliance includes IEEE 802.3z for Gigabit Ethernet, IEEE 802.3ah for 1000Base-BX20 applications, and 1G Fiber Channel at 1.0625 Gbps for storage networking. Regulatory certifications encompass CE marking, RoHS compliance, and Class 1 laser safety per FDA and IEC 60825-1 standards.

Typical deployment scenarios include utility network infrastructure, intelligent transportation systems, outdoor small cell backhaul, industrial Ethernet applications, and any installation requiring the 1310/1490nm wavelength plan combined with industrial-grade environmental resilience. The dual-channel BiDi architecture maximizes efficiency in both port utilization and fiber infrastructure.

Because our focus is providing top quality service, we perform comprehensive quality verification including extended temperature validation, optical parameter measurements for both channels, connector cleanliness testing, and EEPROM memory data validation.