1.25G Dual-Port BiDi cSFP 20km Industrial TX1310/RX1550: 1.25G-cSFP-20-ADI

Our EDGEOPTIC 1.25G-cSFP-20-ADI is a multi-vendor compatible industrial-grade dual-port compact SFP optical module engineered for demanding environments where standard commercial transceivers cannot operate reliably. This cSFP transceiver integrates two independent BiDi (Bidirectional) channels within a single standard SFP footprint, delivering doubled port density for Gigabit Ethernet deployments in harsh conditions.

The 1.25G-cSFP-20-ADI operates with both channels transmitting at 1310nm wavelength and receiving at 1550nm, supporting data rates from 1.063 to 1.25 Gbps per channel. Each channel employs BiDi technology with WDM (Wavelength Division Multiplexing) to achieve full-duplex communication over individual fiber strands. This module must be paired with its complementary counterpart, the 1.25G-cSFP-20-BDI (TX1550/RX1310), to establish proper bidirectional links.

The defining characteristic of this industrial variant is its extended operating temperature range spanning -45 to +85°C. This wide thermal envelope makes the transceiver suitable for outdoor cabinet installations, roadside equipment enclosures, industrial automation environments, and transportation infrastructure where ambient temperatures can fluctuate dramatically across seasons or due to equipment heat generation in confined spaces.

The transceiver employs FP (Fabry-Perot) laser transmitters paired with PIN photodiode receivers for each channel. Industrial-grade components are selected and qualified for consistent performance across the entire temperature range. With transmit power ranging from -9 to +3 dBm and receiver sensitivity of -23 dBm, the module delivers a guaranteed 14 dB optical link budget supporting transmission distances up to 20 kilometers over standard single-mode fiber. Actual achievable distance depends on fiber plant conditions, connector quality, and accumulated splice losses in the specific deployment.

The 1.25G-cSFP-20-ADI features a Double LC/UPC connector interface providing two separate optical ports within the compact enclosure. The electrical interface conforms to CSFP MSA Option 2 specifications, ensuring compatibility with industrial networking equipment from multiple vendors supporting this form factor.

Digital Diagnostic Monitoring (DDM/DOM) functionality provides real-time visibility into operational parameters including transmitted and received optical power for both channels, module temperature, laser bias current, and supply voltage. Temperature monitoring becomes particularly valuable in industrial deployments, enabling operators to correlate optical performance with environmental conditions and verify operation within specified limits.

Standards compliance includes IEEE 802.3z for Gigabit Ethernet and IEEE 802.3ah for 1000Base-BX20 applications. The transceiver also supports 1G Fiber Channel at 1.0625 Gbps. Certifications include CE marking, RoHS compliance, and Class 1 laser safety per FDA and IEC 60825-1 standards.

Typical deployment scenarios include outdoor wireless backhaul aggregation, railway and highway communication systems, utility substation networking, mining and oil/gas facility connectivity, and any application where equipment operates in uncontrolled thermal environments. The dual-channel BiDi architecture maximizes both port density and fiber efficiency in space-constrained outdoor enclosures.

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