Cudy Single Mode 1.25G LC Bi-Directional SFP 20km

SKU: SM100GSB-20AB Categories: , Brand:

Original price was: R429.00.Current price is: R389.00.

Discounted price when paying by EFT

Cudy Single Mode 1.25G LC Bi-Directional SFP 20km

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Joburg & Pretoria: 1 - 3 business days
Cape Town & Durban: 2 - 4 business days
Rest of SA: 3 - 7 business days
*Click here for our delivery policy

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Cudy’s CD-SFP-SMB is your answer for efficient and cost-effective single-mode fibre deployments! These bi-directional modules redefine connectivity standards with a powerful design optimised for 1.25 Gbps transmission over distances of up to 20km.

The CD-SFP-SMB modules are sold as a pair and feature a smart SFP package with LC connectors, ensuring cross-vendor compatibility. What distinguishes them is their novel application of bi-directional technology, which enables duplex transmission on a single fibre by utilising two distinct wavelengths for TX and RX on the same optical strand. This not only improves performance but also significantly lowers installation costs.

Choose between the SM100GSB-20A with a 1310nm FP laser and a 1550nm PIN photodetector or the SM100GSB-20B with a 1550nm DFB laser and a 1310nm PIN photodetector to meet your specific requirements.

These modules provide dependable performance because they are powered by a single +3.3V power supply and have an LVPECL-compatible data input/output interface. The CD-SFP-SMB provides a strong and secure connection thanks to its low EMI and excellent ESD protection. These modules prioritise environmental sustainability while adhering to RoHS and SFF8472 standards.


  • SFP package with LC connector
  • SM100GSB-20A: 1310nm FP Laser and 1550nm PIN photodetector
  • SM100GSB-20B: 1550nm DFB Laser and 1310nm PIN photodetector
  • Up to 20 km transmission on SMF
  • +3.3V single power supply
  • LVPECL-compatible data input/output interface
  • Low EMI and excellent ESD protection
  • Compatible with RoHS
  • Compatible with SFF8472


  • Ethernet Channel Speed: 1.25 GB/s
  • Fibre Channel Speed: 1.06 Gb/s
  • Form Factor: SFP (BiDi)
  • Mode: Single Mode
  • Supported Distance: 20km
  • Wavelength: 1310nm / 1550nm
  • Optical Eye Diagram: IEEE 802.3z and ANSI Fibre Channel Compatible
  • Input Differential Impendence (Min) (Max): 90, 110 Ohm
  • Data Input Swing Differential (Min) (Max): 500, 2400 mV
  • Output differential impendence (Typ): 100 Ohm
  • Data Input Swing Differential (Min) (Max): 370, 2000 mV
  • Supply Voltage (Min) (Max): 3.15, 3.45 V
  • Operating Case Temperature (Min) (Max): 0, 70 ℃
  • Voltage: 3-15 ~ 3.45 V
  • Bias Current: 10 ~ 80 mA
  • Tx Power: -9 ~ -3 dBm
  • Rx Power: -26~-3 dBm


  • Cudy 1.25Gbps BIDI SFP Optical Transceiver 20Km DDM x1
  • Installation Guide x1


Our shipments are handled by reputable courier companies, striving for prompt delivery. However, should unexpected delays occur we will attempt to inform you as soon as we receive notification from the courier companies.  The below shipping estimates apply:

  • Johannesburg & Pretoria: 1–3 business days
  • Cape Town & Durban: 2–4 business days
  • Rest of South Africa: 3–7 business days

Collection / Pay on collection:

You may also collect and pay your order, from our offices in Centurion. Please wait for confirmation that your order is ready before coming for collection.

Our full delivery policy can be found here: Delivery Policy