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A Quick Overview of Cisco SFP-1G-LH Module

GeorgeUpdated at Dec 31st 20241 min read

SFP-1G-LH (formerly named GLC-LH-SM) is the Cisco 1000Base LX/LH SFP transceiver module, which is one of the most commonly used SFP modules. It is hot-swappable and designed to plug directly into SFP/GBIC interface port or slot in your router and switch for Ethernet & Fibre Channel network applications. This article will give a detailed introduction to the specifications, advantages and common queries of SFP-1G-LH.
Specifications of Cisco SFP-1G-LH Optical Module
The Cisco SFP-1G-LH optical module features a high-density duplex LC interface suitable for multimode and single mode fiber optics. It adheres to SFP MSA, operates on Gigabit networks up to 10km at 1Gbps, and complies with IEEE 802.3z standards. The following chart shows detailed parameters of the Cisco SFP-1G-LH SFP optical module:
Cisco Genuine
SFP-1G-LH
Package
SFP
Max. Data Rate
1.25 Gbps
Wavelength
1310nm
Max Cable Distance
10km
Cable Type
SMF
Interface
Duplex LC
DOM Support
Yes
TX Power
-9.5 ~ -3dBm
Receiver Sensitivity
< -20dBm
Commercial Temperature Range
0 to 70°C (32 to 158°F)
Protocols
IEEE 802.3ah-2004, IEEE 802.3z, SFF-8472, SFP MSA (INF-8074i) Compliant
Advantages of Cisco SFP-1G-LH Optical Modules
First. Cisco SFP-1G-LH optical module can function immediately without configuration, which saves installation time by leaving out this complicated procedure. It also offers internal calibration to optimize system’s data throughput.
Second. Cisco SFP-1G-LH optical module is a hot swappable transceiver module, which features plug and play. Long ago, a transceiver failure would cause downtime and a lot of time to reconfigure a new transceiver module. But now, with Cisco SFP-1G-LH, you can just pop in the replacement without shutting down the whole system, and your network is back online.
Third. Cisco SFP-1G-LH optical module could work with both multimode fiber and single mode fiber. When working with single mode fiber, the transmission distance can reach 10 km, suitable for long-distance transmission applications such as hospitals or campus networks. While working with multimode fiber gives you a maximum throughput upwards of 1.25 Gbps with the transmission distance as far as 550m.
Cisco SFP-1G-LH Compatible Switch Models
Cisco SFP-1G-LH is supported on a wide range of Cisco equipment. Here are some of the Cisco network switches compatible for your reference.
Cisco Switch Models Supporting SFP-1G-LH Module
2960S-F48TS-S
WS-C2975GS-48PS-L
IE-2000-4TS-G-B
ME-3400EG-12CS-M
WS-C2950ST-24 LRE
WS-C2960S-48TS-S
2960S-F48FPS-L
WS-C3750-24FS-S
4500 WS-X45-SUP8-E
6500 ME-C6524GT-8S
6500 WS-X6724-SFP
ME-3400G-2CS-A
Nexus 5000 N55-M8P8FP
5700 WLC AIR-CT5760-50-K9
3000 WS-CBS3020-HPQ
ME-3400G-12CS-D
C6880-X
ASR-9000V-DC-E
Common Queries About Cisco SFP-1G-LH SFP Optical Module
GLC-LH-SM vs. GLC-LH-SMD
As mentioned earlier, the SFP-1G-LH module was known as GLC-LH-SM before the name was changed. Cisco replaced GLC-LH-SM with GLC-LH-SMD years ago, sparking interest and disscussion among network engineers. Although the two modules are similar in appearance and differ only by one letter "D", there are still some key differences. Understanding them is crucial for selecting the right one for your Cisco switch.
GLC-LH-SM vs. GLC-LH-SMD Similarities
Cisco's GLC-LH-SM and GLC-LH-SMD transceiver modules are both used in 1Gbps Ethernet networks and comply with IEEE 802.3z 1000BASE-LX/LH, functioning up to 10km on single-mode fibers and 550m on multimode fibers. They are interchangeable and require a mode conditioning patch cable for legacy multimode use. Both have dual LC/PC connectors and operate at 1300nm wavelength.
GLC-LH-SM vs. GLC-LH-SMD Differences
The Cisco SFP GLC-LH-SMD module introduces a unique "D" identifier for Digital Diagnostic Monitoring (DDM), which differs from the GLC-LH-SM SFP module. The "D" here does not stand for "duplex" or "robust," but rather emphasizes its advanced monitoring capabilities.
GLC-LH-SMD's DDM capabilities provide detailed component monitoring with real-time parameters. The DDM interface extends serial ID interfaces from GBIC and SFP MSA specifications, providing advanced alarm and warning systems for operational inconsistencies. This feature enables the GLC-LH-SMD to achieve fault isolation and predictive maintenance, thus surpassing the GLC-LH-SM in functionality.
The iteratively upgraded GLC-LH-SM, i.e. SFP-1G-LH, is now equipped with DDM function, which greatly improves the comprehensiveness and efficiency of the data transmission process.
SFP-1G-LH vs. SFP-1G-SX
To construct a 600ft 10G network using Cisco 3650 modular switches and multimode 62mm fiber with LC connectors, which transceiver module would you choose, SFP-1G-LH or SFP-1G-SX?
When deciding between SFP-1G-LH and SFP-1G-SX optical modules, both designed for multimode fiber compatibility, the crucial consideration is the max cable distance. Generally, single mode fibers support longer spans than multimode ones. For shorter distances with 62.5µm multimode fiber, the SFP-1G-SX module is an ideal pick. Conversely, for extended lengths over either multimode or single mode fiber, the SFP-1G-LH module is the superior option.
One might argue that SFP-1G-LH offers more flexibility but costs double compared to SFP-1G-SX. However, the right supplier can minimize the price gap, and also offer high quality. The following table shows the detailed information.
Module Model
SFP-1G-LH
SFP-1G-SX
Form Type
SFP
SFP
Max Data Rate
1.25Gbps
1.25Gbps
Wavelength
1310nm
850nm
Max Cable Distance
10km@SMF
550m@50/125µm OM2 MMF
275m@62.5/125µm OM1 MMF
220m@62.5/125µm FDDI MMF
Interface
Duplex LC
Duplex LC
Optical Components
FP 1310nm
VCSEL 850nm
Cable Type
SMF
MMF
DOM Support
Supported
Supported
TX Power
-9.5 ~ - 3dBm
-9.5 ~ -3dBm
Receiver Sensitivity
< -20dBm
< -17dBm
Commercial Temperature Range
0 to 70°C (32 to 158°F)
0 to 70°C (32 to 158°F)
Protocols
IEEE 802.3ah-2004, IEEE 802.3z, SFF-8472, SFP MSA (INF-8074i) Compliant
IEEE 802.3z, SFF-8472, SFP MSA (INF-8074i) Compliant
Price (FS.com)
$8.00
$7.00
Purchase the SFP-1G-LH module at FS.com
A quick internet search for optical transceivers can yield vastly different prices between OEM optics and many other third-party optics suppliers. For example, a 1000base SFP transceiver module can cost as low as $10 to as high as $250. You might be shocked and confused by such a huge price disparity. Why are OEM optics many times more expensive than third-party optics? What's the difference between them and what should I choose? The next part will compare Cisco SFP-1G-LH with compatible Cisco SFP-1G-LH supplied by FS.com.
Quality
The Cisco SFP-1G-LH module is on par with the FS brand SFP-1G-LH in terms of quality, and both demonstrate consistent high standards in terms of manufacturing process, material selection and performance indicators, ensuring stability and durability. FS modules also undergo a rigorous quality control and testing process to ensure seamless compatibility and high reliability with a wide range of devices. Therefore, there is no need to worry about quality differences between the them.
Long Time Warranty
Concerned about the warranty? At FS, a reputable third-party optical supplier, you can enjoy the assurance of a comprehensive 5-year product warranty complemented by exceptional post-purchase support. Should you encounter any issues such as compatibility problems with your existing optics, rest assured that FS.com swiftly diagnoses and replaces optical modules at minimal or no cost to you. By contrast, Cisco only offers a 1-year warranty. Most OEMs only provide a few-year warranty. Our long time warranty policy significantly exceeds the industry standard and adds a lasting guarantee to your investment. Below is an overview of the warranty duration of some major OEM brands.
OEM
Cisco
Juniper
Brocade
Huawei
HPE
Extreme
Warranty Duration
1 Year
1 Year
1 Year
1 Year
1 Year
1 Year
Price
The OEMs make huge profits from selling optics, so they always charge exorbitant prices for their optics. But third party optics are much cheaper than original ones. However, third party optics suppliers are numerous, and why choose FS.com? That's because the price of FS SFP-1G-LH is much lower than the original price.
Brand
FS.com
Cisco
Price
$8.00
$259.00
Conclusion
According to the aforementioned, it becomes apparent that acquiring more affordable Cisco SFP-1G-LH optical modules is a wise decision as long as both original equipment manufacturer (OEM) and third-party alternatives ensure equivalent quality and performance. This is where FS stands out as an excellent choice. Not only do we offer a wide range of transceiver modules compatible with Cisco, but our inventory also includes options for other leading brands such as HPE, Juniper, Arista, and more.
What distinguishes us from many third party suppliers is our commitment to quality assurance. We have always promised to produce original, high-quality products, and our well-designed, state-of-the-art test center guarantees perfect compatibility with all major suppliers and systems. This rigorous testing process ensures that every product we offer meets stringent industry standards, giving you peace of mind and trust in your purchasing decisions. To learn more, please contact us for help.