Small Form Pluggable SFP Optical Transceiver 1.25G 120km 1490nm-TX/1550nm-RX

Basic Information
Place of Origin: China
Brand Name: GIGAOPTO
Certification: CE, FCC, ROHS, ISO9001, ISO14000, MSDS, REACH, CP65, TUV, UL
Model Number: GTS-B4512-C0DC
Minimum Order Quantity: 1 pcs
Price: Negotiable
Packaging Details: Single Package, 10 or 20pcs per Tray, 30 or 50 or 100pcs per box, 400 or 600pcs per carton
Delivery Time: 1-5 working days
Payment Terms: T/T, Western Union
Supply Ability: 100,000pcs / month
Detail Information
Form Factor: SFP Speed: 1.25Gb/s
RX Sensitivity: < -31dBm Max Cable Distance: 120km (74.6 Miles)
Center Wavelength: 1490nm-TX/1550nm-RX Transmitter Output Power: -1~4dBm
Power Budget: 31dB
High Light:

Small Form Pluggable SFP Optical Transceiver


SFP Optical Transceiver 1.25G


Small Form Pluggable SFP 120km

Product Description

Cisco Compatible 1000BASE-BX BiDi SFP Transceiver Module 1.25G 1490nm-TX/1550nm-RX 120km SMF DOM Simplex LC




The GIGAOPTO's GTS-B4512-C0DC SFP transceiver is a high performance, cost effective module supporting data rate of 1.25Gbps and 120km transmission distance with SMF. The transceiver consists of five sections: the LD driver, the limiting amplifier, the digital diagnostic monitor, the 1490nm FP laser (the 1550nm DFB laser)and the PIN/TIA.


This transceiver meets the Small Form Pluggable (SFP) industry standard package utilizing an integral LC-Bi-dirictional optical interface connector. This bi-directional unit must be used with another transceiver or network appliance of complementing wavelengths.An enhanced Digital Diagnostic Monitoring Interface has been incorporated into the transceiver that allows real-time performance monitoring via 2-wire Interface (TWI/I2C).


The SFP BX120 transceivers satisfy class I laser safety requirements, and are compatible with SFP Multi-Source Agreement and SFF-8472 digital diagnostics functions.



  • Up to 1.25Gbps data rate
  • Hot pluggable SFP form factor
  • Two types:

A:1490nm FP transmitter /1550nm receiver

B:1550nm DFB transmitter/1490nm receiver

  • Metal enclosure, for lower EM
  • International ClassⅠlaser safety certified
  • Real Time Digital Diagnostic Monitoring
  • Single +3.3V power supply
  • Link distances up to SMF 120km
  • BIDI LC/UPC type pluggable optical interface
  • Low power dissipation
  • Case operating temperature range:

Commercial: 0°C ~ 70°C (32 ~ 158°F)

Extended: -20°C~ 85°C (-4 ~ 185°F)

Industrial: -40°C~85°C (-40 ~ 185°F)

  • Compliant with SFP MSA and SFF-8472
  • RoHS Compliant and lead-free
  • Compliant with IEEE 802.3z


  • Switch to Switch Interface
  • Router/Server Interface
  • Fast Ethernet
  • Backplane Applications



Compatible Brand CISCO Compatible P/N GLC-BX120-U
Form Type SFP Data Link 1.25Gbps
Interface LC Single Cable Length 120km
Digital Diagnostic Monitoring Supported Fibre Type Single Mode Fiber
Power Budget 31dB Temperature



0 to 70°C (32 to 158°F)

-40 to 85°C (-40 to 185°F)

Center Wavelength 1490nm-TX/1550nm-RX Power Supply Voltage 3.3V
Power Consumption 1W Icc 280mA
Optical Components DFB BiDi Receiver Type PIN
Transmitter Power -1~4dBm Sensitivity < -31dBm
Extinction Ratio >9dB

Input Saturation


Protocols Fast Ethernet, IEEE 802.3z, Gigabit Fibre Channel, MSA Compliant


Notice: When the long reach transceiver is used in short distance transmission, please matched with appropriate attenuator

according to the table.

Distance ≤20km ≤40km ≤60km
Attenuator 15dB 10dB 5dB




Each Gigaopto’s optical transceiver is tested in the host device to verify interoperability, and we promise 100% full compatibility on the specified device with a 3-year warranty.
For this (1000BASE-BX BiDi SFP TX1490nm/RX1550nm 120km), please refer to the P/N correspondence table. If you are interested in knowing more compatibility, you are always welcome to contact us.


Compatible Brand Compatible Part Number Compatible Brand Compatible Part Number
Juniper SFP-GE120KT14R15 Dell SFP-GE-BX120U-1490
Brocade E1MG-1G-BXU-120 Extreme MGBIC-BX120-U
HuaWei LE2MGSC120DE0    



Ordering Information


P/N Description Data Rate Wavelength Distance
GTS-B4512-80DC 1000BASE-BX BiDi SFP 1.25Gbps 1490nm-TX/1550nm-RX 80km
GTS-B5412-80DC 1000BASE-BX BiDi SFP 1.25Gbps 1550nm-TX/1490nm-RX 80km
GTS-B495712-80DC 1000BASE-BX BiDi SFP 1.25Gbps 1490nm-TX/1570nm-RX 80km
GTS-B574912-80DC 1000BASE-BX BiDi SFP 1.25Gbps 1570nm-TX/1490nm-RX 80km
GTS-B4512-C0DC 1000BASE-BX BiDi SFP 1.25Gbps 1490nm-TX/1550nm-RX 120km
GTS-B5412-C0DC 1000BASE-BX BiDi SFP 1.25Gbps 1550nm-TX/1490nm-RX 120km


Contact Details

WhatsApp : +8615989585901