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1000BASE-BX40-U SFP provides dependable single-fiber connectivity over 40 km.
GLC-BX40-U-I
1000BASE-BX40-U for 40km Single-Fiber Bidirectional Applicat...
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GLC-BX40-U-I
- Description:
- 1000BASE-BX40-U for 40km Single-Fiber Bidirectional Applications; with DOM
- Rating:
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- Brand:
- Cisco
- GTIN:
- 818278553605
- Condition:
- Warranty:
- 3
- List Price:
$3,068.00
- Price:
$1,357.0055.8% off
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GLC-BX40-U-I Overview
GLC-BX40-U-I is a compact SFP optical transceiver engineered for 1G Ethernet connectivity, offering long-range data transmission over single-mode fiber using LC connectors. It is designed to support extended-distance applications—up to 40 km—making it ideal for telecom, enterprise, and data center environments that demand reliable and efficient network performance.
This transceiver module adheres to standardized SFP form factors with precise physical dimensions optimized for high-density installations. It supports Ethernet protocols and is a dependable solution for network infrastructures requiring robust data communication over long distances while maintaining compatibility with Cisco systems.
GLC-BX40-U-I price is $1,357.00, a 55.8% saving from the Cisco list price of $3,068.00. GLC-BX40-U-I is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for GLC-BX40-U-I for additional pricing. Browse the full Sfp series or explore all Cisco products.
GLC-BX40-U-I Specifications
- Product Type
- Transceiver
- Form Factor
- SFP
- Data Rate
- 1G
- Connector Type
- LC
- Wavelength
- 1270 nm (TX) / 1330 nm (RX)
- Transmission Distance
- Long-Range
- Fiber Type
- Single-mode
- Max Distance
- 40 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-BX40-U-I
- Height
- N/A
- Width
- N/A
- Depth
- N/A
- Weight
- N/A
GLC-BX40-U-I Use Case
Enterprise Campus Backbone Extension with GLC-BX40-U-I-1000BASE-BX40-U
In a multi-building corporate campus, IT teams deploy GLC-BX40-U-I-1000BASE-BX40-U for 40km Single-Fiber Bidirectional Applications with DOM to interconnect data centers 30 km apart using just one fiber strand. Integrated Digital Optical Monitoring (DOM) delivers real-time diagnostics on power levels and link health, reducing mean time to repair (MTTR) by 40% and cutting fiber lease expenses by half.
Metro ISP Access Network Extension over 40 km Single-Fiber
A regional ISP leverages GLC-BX40-U-I-1000BASE-BX40-U for 40km Single-Fiber Bidirectional Applications with DOM to extend Gigabit Ethernet to a remote neighborhood node without laying additional fiber. Single-fiber bidirectional transmission maximizes existing infrastructure, while DOM enables proactive fault detection, achieving 99.99% service availability and accelerating new subscriber onboarding by 60%.
Remote Industrial Control Network via Single-Fiber Bidirectional Link
An energy utility uses GLC-BX40-U-I-1000BASE-BX40-U for 40km Single-Fiber Bidirectional Applications with DOM to connect a substation 38 km from the central control room. Single-fiber bidirectional operation reduces cable complexity, and built-in DOM provides continuous optical performance metrics. This setup ensures sub-millisecond latency for SCADA traffic, boosts network uptime to 99.998%, and supports predictive maintenance strategies.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| GLC-BX40-U-I |  GLC-FE-100BX-D= |  GLC-ZX-SM-RGD |  GLC-BX40-DA-I |  GLC-ZX-SMD | |
|---|---|---|---|---|---|
| Compatibility | Cisco | Cisco | Cisco | Cisco | Cisco, Juniper, Huawei, Arista |
| Connector Type | LC | LC | LC | LC | LC |
| Data Rate | 1G | 100 Mbps | 1G | 1G | 1G |
| Depth | N/A | N/A | 1.75 inches | 2.22 inches | 0.8 inches |
| Fiber Type | Single-mode | Single-mode | Single-mode | Single-mode | Single-mode |
| Form Factor | SFP | SFP | SFP | SFP | SFP |
| Height | N/A | N/A | 0.3 inches | 0.33 inches | 0.2 inches |
| Input Voltage | 3.3V | 3.3V | 3.3V | 3.3V | 3.3V |
| Max Distance | 40 km | 10 km | 80 km | 40 km | 80 km |
| Network Interface | Fiber | Fiber | Fiber | Ethernet | Fiber |
| Operating Temperature | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C |
| Power Consumption | N/A | 1.5 W | 1.2W | 1.25 W | 1.5W |
| Product Name | GLC-BX40-U-I | GLC-FE-100BX-D= | GLC-ZX-SM-RGD | GLC-BX40-DA-I Bidirectional SFP Transceiver | GLC-ZX-SMD |
| Product Type | Transceiver | Transceiver | Transceiver | Transceiver | Transceiver |
| Storage Temperature | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C |
| Supported Protocols | Ethernet | Ethernet | Ethernet, Fibre Channel | Ethernet | Ethernet, Fibre Channel |
| Transmission Distance | Long-Range | Long-Range | Long-Range | Extended-Range | Long-Range |
| Wavelength | 1270 nm (TX) / 1330 nm (RX) | 1270 nm (TX) / 1330 nm (RX) | 1550 nm | 1490/1550 nm | 1310 nm |
| Weight | N/A | N/A | 0.1 lbs | 0.05 lbs | 0.05 lbs |
| Width | N/A | N/A | 0.87 inches | 0.53 inches | 0.7 inches |
Reviews & Ratings
O
Owen Ross
5
Professional-grade, durable transceiver with DOM support.
P
Paige Grant
5
Easy to deploy and maintain stable performance.
Q
Quentin Blake
5
Reliable and consistent for enterprise fiber networks.
R
Rhea Carter
5
Handles long-distance fiber connections efficiently.
Questions & Answers
What is the GLC-BX40-U-I SFP transceiver?
The GLC-BX40-U-I is a 1000BASE-BX40-U Small Form-Factor Pluggable (SFP) module for 40 km single-fiber bidirectional Gigabit Ethernet links with Digital Optical Monitoring (DOM).
Which fiber type does the GLC-BX40-U-I support?
The module operates over single-mode fiber (SMF) using a single strand for bidirectional transmission and a standard SC connector.
What wavelength does the GLC-BX40-U-I use?
The GLC-BX40-U-I transmits at 1310 nm and receives at 1490 nm for upstream applications, adhering to 1000BASE-BX40 specifications.
How far can the GLC-BX40-U-I transmit data?
It supports link distances up to 40 km on single-mode fiber with a minimum optical budget suitable for most carrier and enterprise networks.
Does the GLC-BX40-U-I support DOM?
Yes, it features Digital Optical Monitoring (DOM) to report real-time parameters such as optical output power, input power, temperature and voltage.
Is the GLC-BX40-U-I hot-pluggable?
Yes, the SFP form factor allows for hot-plug insertion and removal without powering down the host device.
Which data rate does the GLC-BX40-U-I support?
The module supports a data rate of 1.25 Gbps for full-duplex Gigabit Ethernet transmission.
Is the GLC-BX40-U-I compatible with Cisco devices?
Yes, it is fully compatible with Cisco switches and routers that accept 1000BASE-BX40-U SFPs supporting DOM.
Can I use the GLC-BX40-U-I with non-Cisco equipment?
The transceiver adheres to IEEE 802.3ah and MSA standards, ensuring interoperability with any vendor’s hardware that supports 1000BASE-BX40-U.
What are the power requirements of the GLC-BX40-U-I?
It operates at a supply voltage of 3.3 V with a maximum power dissipation of 1 W, meeting SFP MSA specifications.
How does single-fiber bidirectional technology benefit networks?
It reduces fiber cabling by transmitting and receiving on a single strand, lowering infrastructure costs and simplifying deployments.
What temperature range does the GLC-BX40-U-I support?
The module operates reliably from 0 °C to 70 °C (commercial grade) and can be upgraded to an extended temperature range if required.
Are there any safety certifications for the GLC-BX40-U-I?
Yes, it carries UL, CE, FCC and RoHS certifications, ensuring compliance with global safety and environmental standards.
How do I install the GLC-BX40-U-I in a switch?
Insert the SFP into the uplink slot until it clicks, then connect your single-mode fiber cable to the SC port; the link LED will indicate a successful connection.
How can I verify the DOM status on the GLC-BX40-U-I?
Use your switch’s CLI or network management system to query DOM registers for optical power, temperature, voltage and laser bias current.
What troubleshooting steps apply if the GLC-BX40-U-I link is down?
Check fiber continuity, polarity, SFP seating, interface configuration and DOM readings to diagnose optical power or hardware issues.
What is the optical budget of the GLC-BX40-U-I?
The module offers an optical budget of at least 19 dB, supporting reliable 40 km links under standard single-mode fiber conditions.