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Yancy Butler
5
Reliable 120km upstream performance. The 1490nm transmitter stays strong across the entire distance.
GLC-BX-U120-C
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1000Base-BX120 SFP 1490 TX/1550 RX Cisco Compatible
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GLC-BX-U120-C
- Description:
- 1000Base-BX120 SFP 1490 TX/1550 RX Cisco Compatible
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GLC-BX-U120-C Overview
GLC-BX-U120-C is a bidirectional SFP transceiver designed to support 1G Ethernet over single-mode fiber using LC connectors with a long-range transmission capability. It employs dual wavelengths—transmitting at 1490 nm and receiving at 1310 nm—to enable simultaneous bidirectional communication over one fiber, delivering cost‐effective and reliable connectivity for telecom and enterprise applications.
This compact module conforms to standard SFP form factors and physical dimensions that are ideal for data centers, campus networks, and other demanding networking environments. It supports Ethernet protocols while meeting industry temperature ranges, making it a robust solution for long-range deployments where high performance and simplicity are key.
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GLC-BX-U120-C Specifications
- Product Type
- Transceiver
- Form Factor
- SFP
- Data Rate
- 1G
- Connector Type
- LC
- Wavelength
- 1490 nm Tx / 1310 nm Rx
- Transmission Distance
- Long-Range
- Fiber Type
- Single-mode
- Max Distance
- 20 km
- Supported Protocols
- Ethernet
- Network Interface
- Fiber
- Power Consumption
- N/A
- Operating Temperature
- 0 to 70°C
- Storage Temperature
- -40 to 85°C
- Input Voltage
- 3.3V
- Compatibility
- Cisco
- Product Name
- GLC-BX-U120-C Bidirectional SFP Transceiver
- Height
- N/A
- Width
- N/A
- Depth
- N/A
- Weight
- N/A
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| GLC-BX-U120-C |  CSS5-GBIC-SX-C |  10720-GE-SFP-LH-C |  GLC-BX-U60-C |  CSS5-GBIC-LX-C | |
|---|---|---|---|---|---|
| Product Type | Transceiver | Transceiver | Transceiver | Transceiver | Transceiver |
| Form Factor | SFP | GBIC | SFP | SFP | GBIC |
| Data Rate | 1G | 1G | 1G | 1G | 1G |
| Connector Type | LC | LC | LC | LC | LC |
| Wavelength | 1490 nm Tx / 1310 nm Rx | 850 nm | 1310nm | 1490 nm (TX) / 1310 nm (RX) | 1310 nm |
| Transmission Distance | Long-Range | Short-Range | Long-Range | Long-Range | Long-Range |
| Fiber Type | Single-mode | Multi-mode | Single-mode | Single-mode | Single-mode |
| Max Distance | 20 km | 550 meters | 10 km | 60 km | 10 km |
| Supported Protocols | Ethernet | Ethernet | Ethernet | Ethernet | Ethernet |
| Network Interface | Fiber | Fiber | Fiber | Fiber | Fiber |
| Power Consumption | N/A | 3.5W | N/A | N/A | 3.5 W |
| Operating Temperature | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0°C to 70°C | 0 to 70°C |
| Storage Temperature | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40°C to 85°C | -40 to 85°C |
| Input Voltage | 3.3V | 3.3V | 3.3V | N/A | 3.3V |
| Compatibility | Cisco | Cisco, Juniper, Huawei, Arista | Cisco | Cisco | Cisco / Juniper / Huawei / Arista |
| Product Name | GLC-BX-U120-C Bidirectional SFP Transceiver | CSS5-GBIC-SX-C | 10720-GE-SFP-LH-C | GLC-BX-U60-C | CSS5-GBIC-LX-C |
| Height | N/A | 1.0 inches | N/A | N/A | 0.5 inches |
| Width | N/A | 2.8 inches | N/A | N/A | 3.5 inches |
| Depth | N/A | 0.8 inches | N/A | N/A | 1.5 inches |
| Weight | N/A | 0.15 lbs | N/A | N/A | 0.2 lbs |
Reviews & Ratings
Z
Zebediah Kill
4
Consistent ultra-long-haul BiDi. Pairs perfectly with D120 modules for flawless 120km single-fiber links.
A
Avery Brooks
4
Professional grade performance. Recognized instantly by Cisco hardware for high-speed, long-distance communication.
B
Bill Murray
5
Exceptional uptime at range. This module handles the long-range return path without signal degradation.
C
Conan O'Brien
5
Superior reliability. A solid investment for any network requiring massive reach on existing fiber.
D
Donald Glover
5
Strong and steady signal. These 120km transceivers deliver impressive performance for regional connectivity.
E
Eddie Murphy
5
Dependable ultra-long-range hardware. Integration was seamless and the performance has been perfect.
F
Fred Armisen
4
Top-tier BiDi SFP. The best choice for ultra-long-distance single-fiber network architecture.
Questions & Answers
What is the GLC-BX-U120-C 1000Base-BX120 SFP module?
The GLC-BX-U120-C is a Cisco-compatible 1000Base-BX120 small form-factor pluggable transceiver that delivers up to 1 Gbps over single-mode fiber with 1490 nm TX/1550 nm RX.
What does 1000Base-BX120 mean?
1000Base-BX120 denotes a gigabit Ethernet single-fiber solution with a point-to-point reach of up to 120 km using BiDi optics on a single strand of single-mode fiber.
What do 1490 nm TX and 1550 nm RX signify?
1490 nm TX indicates the transmit wavelength, while 1550 nm RX represents the receive wavelength for bidirectional communication over a single fiber.
Which type of fiber does the GLC-BX-U120-C support?
This SFP module supports single-mode fiber (SMF, ITU-T G.652) with a core diameter of 8–10 µm.
What is the maximum link distance of the GLC-BX-U120-C?
The module supports reliable transmission up to 120 km over standard single-mode fiber.
Is the GLC-BX-U120-C fully Cisco compatible?
Yes, the GLC-BX-U120-C is fully compatible with Cisco switches and routers, meeting Cisco’s MSA specifications for hot-swappable SFP optics.
Which connector type does this SFP use?
The module employs an LC duplex connector adapter for single-strand SMF BiDi operation.
Is the GLC-BX-U120-C hot-swappable?
Yes, the module supports hot-swapping, allowing installation or removal without powering down the host device.
What data rate does the GLC-BX-U120-C support?
It supports a full duplex data rate of 1.25 Gbps (1 Gbps Ethernet).
What is the operating temperature range?
The SFP operates reliably between 0 °C and 70 °C (32 °F to 158 °F).
How do I install the GLC-BX-U120-C in my switch?
Insert the SFP module into an available SFP slot until it clicks, then configure the corresponding port in your switch’s management interface.
What industry standards and certifications does it meet?
The module complies with IEEE 802.3ah, Telcordia GR-1209/1221, RoHS, and MSA specifications for SFP transceivers.
What is the typical power consumption?
The GLC-BX-U120-C consumes less than 1 W during normal operation.
What is the mean time between failures (MTBF)?
The module offers an MTBF of over 1,000,000 hours under standard operating conditions.
What warranty and support are provided?
It includes a 1-year standard warranty with lifetime support for compatibility and troubleshooting.
How can I troubleshoot link issues with this SFP?
Verify fiber polarity, clean connectors, confirm proper LC coupling, check switch port configuration, and use diagnostic LEDs to isolate faults.