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Cisco GLC-LH-SMD Compatible 1000BASE-LX/LH SFP 1310nm 10km Duplex LC SMF Industrial DOM Transceiver Module

Name: Cisco GLC-LH-SMD Compatible 1000BASE-LX/LH SFP 1310nm 10km Duplex LC SMF Industrial DOM Transceiver Module
Brand: LINK-PP: Optical Transceivers & RJ45 Connectors Manufacturer

P/N:

LS-SM311G-10I

Manufacturer:

LINK-PP

Compatible Brand:

Cisco

Compatible P/N:

GLC-LH-SMD

Compatible Brands: Cisco
Form Factor: SFP
Data Rate: 1G
Distance: ≤10km
Type: Single Mode
Connector: Duplex LC
Wavelength: 1310nm
P/N: LS-SM311G-10I
Manufacture: LINK-PP
Compatible Brand: Cisco
Compatible P/N: GLC-LH-SMD

Product Specifications

LINK-PP Part Number	LS-SM311G-10I	Cisco Compatible	GLC-LH-SMD
Form Factor	SFP	Max Data Rate	1.25Gbps
Wavelength	1310nm	Max Cable Distance	10km
Connector	Duplex LC	Media	SMF
Transmitter Type	FP	Receiver Type	PIN
TX Power	-9 to 0dBm	RX Power	-23 to -1dBm
Receiver Sensitivity	-23dBm	DOM Support	Yes
Operating Temperature Range	-40 to 85°C	Protocols	SFF-8472 MSA Compliant, IEEE 802.3ah-2004

LINK-PP LS-SM311G-10I Technical & Compatibility Overview

The LINK-PP LS-SM311G-10I is a hot-pluggable 1.25Gbps Small Form-factor Pluggable (SFP) duplex LC optical transceiver module engineered for industrial 1000BASE-LX/LH Gigabit Ethernet optical links. Designed as a functional and EEPROM-compatible alternative to the Cisco GLC-LH-SMD, it operates at a 1310nm wavelength, supporting transmission distances up to 10km over single-mode fiber (SMF/G.652). Built with a 1310nm FP laser transmitter, PIN photodiode receiver, Digital Optical Monitoring (DOM/DDM) support per SFF-8472, and an extended industrial operating temperature rating of -40°C to +85°C, it provides reliable optical fiber connectivity in harsh networking environments.

Cisco Switch & Protocol Compatibility: Designed for MSA and optical link compatibility with Cisco GLC-LH-SMD, pre-coded for Cisco Catalyst, Nexus, and Industrial Ethernet switches.
1.25 Gbps Throughput & 10km SMF Range: Delivers 1000BASE-LX/LH Gigabit Ethernet performance over duplex LC single-mode fiber up to 10km link distance.
Industrial Operating Temperature (-40°C to +85°C): Fully rated for harsh industrial environments, unconditioned roadside cabinets, and outdoor substation switches.
Digital Optical Monitoring (DOM/DDM): Real-time monitoring of TX/RX optical power, laser bias current, module temperature, and supply voltage per SFF-8472.

Key Design Benefits

Industrial-Grade Thermal Reliability: Operates reliably across -40°C to +85°C, making it suitable for outdoor Cisco Industrial Ethernet (IE) switches and unconditioned field enclosures.
Cisco Switch Interoperability: Pre-programmed with Cisco compatible EEPROM coding to ensure recognition and port initialization in Cisco IOS / NX-OS platforms.
Real-Time DOM Diagnostics: Internal digital diagnostics interface (DOM) allows network administrators to monitor live transmit/receive optical power levels and thermal parameters.
Hot-Pluggable SFP Form Factor: Enables module insertion and replacement in active switch or router line cards without interrupting system power.
Second-Source Supply Continuity: Offers network engineering and procurement teams a qualified industrial-grade alternative to mitigate component lead times and single-source risks.

Optical Architecture & Diagnostic Performance

The LS-SM311G-10I incorporates electro-optical subsystems directly within a compact metallic SFP enclosure to ensure signal integrity across 1000BASE-LX/LH optical channels.

Transmitter & Receiver Subsystems

The transmitter incorporates a 1310nm FP laser driver supplying -9 to 0 dBm optical output power. The receiver incorporates a PIN photodiode with an integrated trans-impedance preamplifier (TIA) providing -23 dBm receiver sensitivity and a -1 dBm overload threshold across 1.25Gbps data streams.

Digital Diagnostic Monitoring (DOM)

An SFF-8472 compliant MCU control unit monitors real-time operational parameters over a 2-wire serial interface. Monitored metrics include transmitted optical power, received optical power, laser bias current, module operating temperature, and internal supply voltage.

Mechanical & Interface Specifications

Enclosed in a standard metal SFP housing featuring a latching bail mechanism for secure insertion and removal. The optical interface uses an industry-standard Duplex LC/UPC receptacle compatible with single-mode fiber (SMF G.652) patch cables. The module operates within an industrial temperature range of -40°C to +85°C and satisfies Class 1 laser safety requirements.

Target Applications

Industrial Ethernet & Substation Automation: Extended-temperature (-40°C to +85°C) 1000BASE-LX/LH Gigabit links for outdoor Cisco Industrial Ethernet switches.
Enterprise Campus & Metro Fiber Networks: Point-to-point 10km optical fiber uplinks between enterprise distribution switches and router ports.
Traffic Control & Utility Backhaul: Ruggedized optical fiber communications for intelligent transportation systems (ITS) and power utility grids.

Cisco GLC-LH-SMD Replacement Compatibility Checklist

When evaluating the LINK-PP LS-SM311G-10I as an alternative to Cisco GLC-LH-SMD, network engineers should verify the following parameters against their system specification:

Optical Wavelength & Distance Matching: Confirm 1310nm wavelength and single-mode fiber (SMF G.652) cable infrastructure up to 10km.
Thermal Class Verification: Confirm whether your deployment environment requires the industrial (-40°C to +85°C) operating temperature rating.
Optical Link Budget: Verify that TX power (-9 to 0 dBm) and RX sensitivity (-23 dBm) satisfy system link attenuation requirements.
Cisco Switch EEPROM Compatibility: Confirm that target Cisco switch or router line cards support standard SFP modules and SFF-8472 DOM protocols.

Frequently Asked Questions

Is LINK-PP LS-SM311G-10I compatible with Cisco switches as an alternative to GLC-LH-SMD?

Yes. The LS-SM311G-10I is engineered with SFP MSA compliance, 1310nm FP laser specs, 10km reach, -40°C to +85°C industrial temperature rating, SFF-8472 DOM support, and pre-coded EEPROM settings to serve as a functional drop-in alternative for Cisco GLC-LH-SMD in Cisco switch and router SFP ports.

What is the advantage of the industrial -40°C to +85°C temperature rating on the LS-SM311G-10I?

The extended -40°C to +85°C industrial operating temperature rating ensures reliable optical laser stability and receiver sensitivity in unconditioned outdoor cabinets, industrial substation switches, and traffic control enclosures where commercial (0-70°C) transceivers may overheat or fail.

What engineering assets are available for Cisco GLC-LH-SMD cross-reference checking?

LINK-PP provides complete technical documentation, including product datasheets, EEPROM coding compatibility tables, mechanical 2D/3D drawings, RoHS compliance certificates, and Class 1 laser safety documentation.

How can procurement and engineering teams request samples or a quotation for LS-SM311G-10I as an alternative to Cisco GLC-LH-SMD?

Procurement and engineering teams can contact LINK-PP to request LS-SM311G-10I evaluation samples for optical, electrical, and Cisco switch compatibility verification. After qualification, our technical sales team can provide competitive pricing, production lead-time estimates, MOQ terms, and volume-order support for replacing Cisco GLC-LH-SMD.

Packaging, Shipping and Global Delivery for Networking Products

Anti-static packaging, shock-resistant protection, fast order dispatch, and reliable worldwide delivery for all LINK-PP networking products.

Anti-Static Protective Packaging

Protect networking products from electrostatic discharge and handling-related damage.

Shock-Resistant Transport Protection

Protect products against physical impacts during storage and international transportation.

Fast Order Processing and Dispatch

Accelerate order handling to ensure quick warehouse deployment.

Global Logistics and International Delivery

Ship products efficiently to customers across worldwide locations.

1G SFP Technical Support and Deployment Assistance

LINK-PP provides expert technical support, from product selection and compatibility verification to deployment and long-term operation.

Pre-Sales Technical Consultation

Technical consultation to help you verify GLC-LH-SMD compatibility and select the appropriate product for your application.

Compatibility Verification Support

Verification support to help ensure compatibility with your equipment, applications, and deployment requirements.

Deployment & Installation Assistance

Comprehensive step-by-step guidance for installation, configuration, and initial setup, ensuring accurate deployment and reliable, stable operation from the start.

Long-Term Technical Assurance

Ongoing technical support throughout the product lifecycle, delivering long-term stability for enterprise and carrier-grade networks.

Industry Standards, Compliance and Quality Assurance

LINK-PP products are manufactured under recognized quality management systems and designed to support applicable industry standards, regulatory compliance, and long-term deployment requirements, including IEEE 802.3, RoHS, REACH, ISO 9001, and ISO 14001 where applicable. 「View Quality & Compliance Center」