• HYTOPTODEVICE Cisco GLC-BX-20U compatible BiDi SFP front view white background
  •  HYTOPTODEVICE 1000BASE-BX-U 20km BiDi SFP side view for Cisco network devices
  • Simplex LC connector detail of GLC-BX-20U equivalent single fiber SFP module
  • Full view Tx1310nm/Rx1550nm BiDi SFP transceiver for Cisco switches and routers
  • HYTOPTODEVICE Cisco GLC-BX-20U compatible BiDi SFP front view white background
  •  HYTOPTODEVICE 1000BASE-BX-U 20km BiDi SFP side view for Cisco network devices
  • Simplex LC connector detail of GLC-BX-20U equivalent single fiber SFP module
  • Full view Tx1310nm/Rx1550nm BiDi SFP transceiver for Cisco switches and routers

Cisco GLC-BX-20U Compatible BiDi SFP Transceiver | 1000BASE-BX20-U 20km Tx1310Rx1490 Bulk Factory Supply | HYTOPTODEVICE

HYTOPTODEVICE Cisco GLC-BX-20U compatible BiDi SFP features 1000BASE-BX-U, Tx1310nm/Rx1550nm, 20km SMF simplex LC. 100% real-device tested for Cisco switches/routers, plug-and-play with full DDM/DOM. Ideal for Gigabit Ethernet, campus LAN and single-fiber enterprise networks. 5-year warranty & factory price.
NO. Brand  Compatible P/N Remarks
1 Cisco MGBBX1 
2 Alcatel-Lucent SFP-GIG-BX-U20 
3 H3C  SFP-GE-PX20-U-SM1310-A
4 Juniper  SFP-GE20KT13R14
5 HPE Procurve  J9143B-20 
6 Brocade E1MG-BXU-20
7 Cisco GLC-BX-20U
Description
Cisco GLC-BX-20U Compatible 1000BASE-BX20-U BiDi SFP Transceiver 20km(SMF, 1310nm-TX/1550nm-RX, Simplex LC, DOM)

Product Overview

The HYTOPTODEVICE Cisco GLC-BX-20U compatible BiDi SFP transceiver is a hot-pluggable gigabit single-fiber bidirectional optical module built for cost-effective enterprise, campus and service provider networks. Using advanced WDM technology, it delivers stable 1.25Gbps bandwidth with Tx1310nm/Rx1550nm wavelength pairing and a simplex LC interface, supporting up to 20km transmission over standard single-mode fiber (SMF)。
This bidirectional module must be paired with a complementary wavelength transceiver (Tx1550nm/Rx1310nm, GLC-BX-20D) to form a complete bidirectional link. It is optimized for Gigabit Ethernet, campus LAN and single-fiber enterprise cabling. Fully compliant with IEEE 802.3z and SFF-8472 MSA standards, it supports full DDM/DOM real-time optical monitoringCisco. Every unit undergoes strict real-device testing on genuine Cisco hardware to ensure seamless plug-and-play operation without manual configuration or system alarms.

Key Technical Specifications 

Below are standardized technical parameters of the HYTOPTODEVICE Cisco GLC-BX-20U BiDi SFP. All specifications comply with MSA and IEEE standards, ensuring stable 20km SMF transmission, consistent wavelength performance, and reliable DDM monitoring for official Brocade deployments.
Cisco Procurve Compatible

GLC-BX-20U

Vendor Name HYTOPTODEVICE
Form Factor SFP Max Data Rate 1.25Gbps
Wavelength TX1310nm/RX1550nm Max Distance 20km 
Connector Simplex LC Transmitter Type 1310nm FP
Cable Type SMF Receiver Type PIN
TX Power -9.0~-3dBm Receiver Sensitivity < -23.0dBm
Protocols SFF-8472 MSA Compliant, IEEE 802.3ah-2004 Operation Temperature 0 to 70°C (32 to 158°F)

Usage Guidelines & Operational Best Practices

Follow standardized operation rules to extend service life and maintain steady link performance of your BiDi SFP Transceiver:

  1. Complementary Pairing Requirement Bidirectional transceivers must be deployed in matched wavelength pairs. This TX1310/RX1490 BiDi SFP Module requires a counterparty TX1490/RX1310 transceiver at the opposite fiber end; mismatched wavelength pairs cannot establish valid fiber links.
  2. Fiber Type Restriction Only use standard 9/125μm single mode fiber (SMF) with LC/UPC patch cords. This transceiver cannot operate normally on multi-mode fiber (MMF), which triggers severe attenuation and persistent random bit errors.
  3. Distance & Attenuation Control Optimized for stable 20km single-fiber links. For lab testing or field deployment under 5km, an external optical attenuator is mandatory to prevent receiver overpowering, signal saturation and permanent internal optical chip damage.
  4. Optical Port Dust Protection LC optical ports and fiber end faces are highly sensitive to dust and fingerprint contamination. Always reinstall protective dust caps on idle module ports and unused fiber connectors after disconnection.
  5. Hot-Plugging Operation Guidance This MSA-compliant BiDi SFP Transceiver supports safe hot swap. Leave several seconds between removal and reinsertion to let Cisco IOS complete full hardware recognition and avoid unexpected link flapping.

Full Compatibility List & Supported Devices

 1. Verified Cisco Device Compatible Models

  This Cisco compatible BiDi SFP passes rigorous real-device verification to ensure true plug-and-play functionality. It works flawlessly on original Cisco IOS firmware without errors, manual config, or firmware updates. Fully verified compatible Cisco devices include: 
  Cisco Switch Series: Catalyst 2960, 3560, 3750, 3850, 9200, 9300 Series
  Cisco Router Series: ISR 1900, 2900, 3900, 4000 Series 
  Other Cisco Devices: Cisco ASA firewalls, media converters, access nodes and enterprise gateways

2. Multi-Brand Compatibility
 Built on universal MSA protocols, this 1000BASE-BX-U simplex LC SFP offers broad compatibility with third-party hardware, including switches, routers and media converters from Juniper, HPE, Brocade, H3C, Alcatel-Lucent, D-Link and TP-Link.
  Real-device test videos are available for bulk orders to verify stable compatibility and consistent link performance.

Common Application Scenarios


This single-fiber BiDi SFP provides reliable, cost-saving solutions for enterprise Ethernet, campus LAN and data center infrastructure, addressing fiber shortages during upgrades and expansions.
  • Campus building-to-building 20km fiber links
  • Gigabit Ethernet enterprise backbone interconnection
  • Data center single-fiber cabling and cable manager integration
  • Telecom access network long-distance transmission
  • Remote industrial and surveillance system connectivity
  • Single-fiber cost-saving network reconstruction


Connectivity Solutions (Applications)

 1. Switch to Switch BiDi Fiber Connection

Pairing GLC-BX-20U with complementary GLC-BX-20D downlink BiDi transceivers creates stable single-fiber connections between Cisco switches, maximizing fiber utilization in campus and enterprise core networks.
Cisco switch to switch single fiber BiDi SFP link with GLC-BX-20U 20km SMF2. Switch to Media Converter Link Connection
It delivers stable gigabit uplink connectivity between Cisco switches and media converters, extending distances for remote campus access and enterprise branch expansion.
Gigabit switch to media converter uplink using Cisco GLC-BX-20U compatible BiDi SFP
3.Switch Link with Cable Manager Integrated Wiring
Used with standard cable managers, it enables clean, standardized cabinet wiring, reducing clutter and simplifying maintenance and future upgrades.

 Data center cable manager wiring solution with Cisco GLC-BX-20U BiDi SFP
Core Product Features

1.Boost Existing Fiber Utilization Using BiDi SFP
Standard dual-fiber optics rely on two cores for two-way communication. Our BiDi SFP leverages WDM tech to achieve bidirectional transmission over a single fiber. It optimizes idle fiber resource utilization, raises fiber operational efficiency, and avoids extra cable deployment during network expansion.
hytoptodevice bidi sfp transceiver module 1.25g smf

2. Double Your Network Capacity

Powered by single-strand bidirectional transmission technology, our premium BiDi SFP Module instantly doubles your network link capacity with no extra fiber cabling required.
Delivering a budget-friendly, high-performance bandwidth expansion solution, it perfectly caters to enterprise network upgrades and FTTx access network optimization projects.

3. Stable 1G Connectivity for High-Availability Data Centers

Even as data centers roll out 100G/400G networks, reliable 1G base infrastructure keeps daily operations running smoothly. Our enterprise 1G BiDi SFP modules deliver consistent low-latency performance. Ideal for OOB management and real-time monitoring, they maintain stable control channels fully separated from fluctuating production traffic.
hytoptodevice 1g bidi sfp module data center

4. Rigorous Host Device Testing for Full Cross-Brand Interoperability

Each BiDi SFP transceiver undergoes full interoperability testing on Cisco, Huawei, H3C and mainstream network equipment. Real-environment checks cover link handshake, DDM data accuracy and hot-swap performance to deliver flawless compatibility and avoid on-site deployment failures.
hytoptodevice cisco compatible bidi sc module

5.Comprehensive Factory Testing Delivers Consistent Stable Performance

Each BiDi SFP Module pass complete factory performance tests covering optical indicators, DDM monitoring and temperature adaptability. Layered quality checks guarantee reliable, stable long-run operation and reduce on-site troubleshooting costs.

high-performance bidi sfp module testing for global importers and distributors


FAQ 

Q1: Are Cisco GLC-BX-20U BiDi SFPs plug-and-play on Catalyst 9300 switches?
A: Yes. HYTOPTODEVICE GLC-BX-20U compatible BiDi SFPs have passed real-machine testing on Cisco Catalyst 9300 switches. They support automatic detection, normal DDM monitoring and stable transmission without alarms, meeting commercial network requirements.

Q2: Can GLC-BX-20U Tx1310nm/Rx1550nm pair with other brand BiDi modules?
A: Absolutely yes. This Cisco compatible BiDi SFP uses standard MSA wavelengths. It pairs perfectly with complementary Tx1550nm/Rx1310nm BiDi modules from other brands for stable single-fiber links with zero interference.

Q3: Do low-cost GLC-BX-20U replacements support DDM real-time monitoring?
A: All HYTOPTODEVICE GLC-BX-20U equivalent BiDi SFPs support full DDM/DOM monitoring per SFF-8472. You can check laser temperature, voltage and optical power via Cisco IOS device management Cisco.

Q4: Is 20km single fiber BiDi SFP stable for long-term Cisco campus operation?
A: Our 20km BiDi SFP for Cisco uses high-quality FP lasers and sensitive PIN receivers. After 72-hour aging tests, it supports 24/7 stable, loss-free operation, ideal for long-running campus and enterprise networks.

Q5: Can GLC-BX-20U BiDi modules be used for Gigabit Ethernet uplink?
A: Fully applicable. This GLC-BX-20U compatible module is optimized for Gigabit Ethernet, supporting stable gigabit uplinks for enterprise and campus equipment and overcoming traditional cable distance limits.

Q6: Are commercial grade GLC-BX-20U BiDi SFPs suitable for data center wiring?
A: Absolutely suitable. With a standard 0°C to 70°C temperature range, this BiDi SFP adapts to data center environments, offering excellent thermal stability to avoid fluctuations and ensure long-term link reliability.

Q7: How to match wavelength pairs for GLC-BX-20U single fiber links?
A: As an uplink BiDi module, GLC-BX-20U (Tx1310nm/Rx1550nm) must pair with complementary downlink transceivers (Tx1550nm/Rx1310nm, GLC-BX-20D). Proper pairing ensures low-latency bidirectional transmission.

Q8: What warranty and support come with Cisco compatible GLC-BX-20U?
A: We provide a 3-year limited warranty and lifelong free technical support for all HYTOPTODEVICE GLC-BX-20U BiDi SFPs. Our team offers 24/7 remote help for compatibility, wavelength pairing and deployment troubleshooting.

Q9: Can GLC-BX-20U BiDi SFPs reduce enterprise fiber costs?
A: Yes. Unlike dual-fiber modules, this single-fiber BiDi SFP uses one fiber for both directions, saving 50% of fiber resources and cutting procurement, construction and maintenance costs.

Q10: Are MSA compliant GLC-BX-20U modules compatible with latest Cisco IOS?
A: All HYTOPTODEVICE GLC-BX-20U BiDi SFPs comply with IEEE and MSA standards. Real-device tests confirm full compatibility with the latest Cisco IOS, with no detection failures, bugs or alarms.

Why Network Engineers Choose HYTOPTODEVICE

HYTOPTODEVICE has supplied over 5000,000 optical transceiver modules to data centers, ISPs, and enterprise networks across 100+ countries since 2011. Every module undergoes a 72-hour burn-in test and full DDM/DOM validation before shipment.

  • 100% hardware-tested compatibility with Cisco, Huawei,Dell,Juniper, and Arista
  • ISO 9001:2015 certified manufacturing facility in Shenzhen
  • Full product range coverage:1.25G/10G/25G/40G/100G/200G/400G/800G/1.6T
  • In-stock supply & fast global shipping, average lead time of 3–5 business days with DHL/FedEx express options
  • Dedicated pre-sales engineering support for custom configurations
  • Actual hardware,actual switches,actual results.we publish compatibility test video,eliminate compatibility anxiety. you can watch before you buy. 
  • We can provide inspection and shipping videos to make you feel as if you are right here with the product.
  • Private Label support - EEPROM / firmware customization support

“Phenomenal performance. We deployed 200 HYTOPTODEVICE SFP modules to replace Cisco OEMs in our backbone network. Result? Zero compatibility issues and a 60% reduction in costs. Highly recommended for mission-critical networks."— Senior Network Engineer, Regional Telecom, Australia

Quality Certification & Compliance

 At HYTOPTODEVICE, our quality commitment is backed by industry-standard validations. From fiber optical transceiver manufacturing to final visual inspection, from IQC、IPQC、FQC to OQC, our processes ensure global compliance and reliability.

We adhere to rigorous standards for our SFP modules and network solutions:

  • ISO 9001: Certified quality management and production consistency.

  • CE & FCC: Fully compliant for seamless Global Market Access.

  • RoHS: Committed to environmental responsibility and hazardous material control.

  • Proven Reliability: Rigorous testing to reduce compliance risk and ensure safety.

Certified Quality. Global Standards. Guaranteed Performance.




Rigorous Industrial Product Testing

   

100% 3rd Party Compatible

Partial Test Demonstration

Others

 




  • HYTOPTODEVICE Cisco GLC-BX-20U compatible BiDi SFP front view white background
  •  HYTOPTODEVICE 1000BASE-BX-U 20km BiDi SFP side view for Cisco network devices
  • Simplex LC connector detail of GLC-BX-20U equivalent single fiber SFP module
  • Full view Tx1310nm/Rx1550nm BiDi SFP transceiver for Cisco switches and routers

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