Cisco GLC-SX-MMD Full Official Product Description
1. Part Number & Naming Definition
Official Full Name
Cisco 1000BASE-SX SFP Multimode Fiber Transceiver with Digital Diagnostic Monitoring
SKU:GLC-SX-MMD
Naming Breakdown
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GLC: Gigabit Ethernet Small Form-Factor Pluggable Transceiver
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SX: Short wavelength multimode Gigabit optical specification
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MMD: Multimode, Digital Diagnostic Monitoring (DOM/DDM) Support
Core Product Positioning
The Cisco GLC-SX-MMD is a hot‑swappable SFP optical transceiver compliant with IEEE 802.3z 1000BASE‑SX standard. It utilizes an 850 nm VCSEL laser to deliver Gigabit Ethernet transmission over low-cost multimode fiber. Compared to legacy GLC-SX-MM, this model supports Digital Diagnostic Monitoring (DOM/DDM) for real-time optical parameter monitoring. It is widely deployed for building backbone uplinks, inter-switch links and access aggregation fiber connections in enterprise campuses and data centers.
2. Hardware & Software Compatibility
Supported Host Platforms
Cisco Catalyst 2960, 3560, 3650, 3750, 3850, 4500, 6500, 6800, 9200, 9300; IE Industrial Switches; ISR 1100/4000 Series; ASR 1000; Wireless Controllers; Firepower appliances equipped with SFP slots.
Supported IOS / IOS XE Versions
All mainstream Cisco IOS and IOS XE releases supporting SFP and DOM functionality.
Fiber Requirement
Multimode Fiber (MMF, OM1 / OM2 / OM3)
Unsupported Platforms
GBIC-only slots, SFP+/SFP28/QSFP ports without adapters, MDS storage switches.
3. Physical & Optical Performance Specifications
Form Factor
Hot‑swappable SFP (mini‑GBIC) compliant with SFP MSA
Optical Interface
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Operating Wavelength: 850 nm (VCSEL)
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Connector: Duplex LC
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Data Rate: 1.25 Gbps wire‑speed Gigabit Ethernet
Maximum Transmission Reach
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OM1 (62.5μm MMF): 220 meters
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OM2 (50μm MMF): 550 meters
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OM3 (Laser-Optimized 50μm MMF): Up to 1000 meters
Optical Power Budget
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Transmit Power: -9.5 dBm ~ -3 dBm
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Receiver Sensitivity: Minimum -17 dBm
Digital Diagnostics
DOM / DDM (Digital Diagnostic Monitoring) Supported
Monitors temperature, supply voltage, laser bias current, transmit optical power, receive optical power.
Environmental Operating Parameters
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Operating Temperature: 0°C ~ +70°C (32°F ~ 158°F, Commercial Grade)
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Storage Temperature: -40°C ~ +85°C (-40°F ~ 185°F)
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Relative Humidity: 10% – 90%, non‑condensing
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Maximum operating altitude: 3,000 meters
Typical Power Consumption
4. Supported Functional Capabilities
Ethernet Transport
Wire‑speed Gigabit Ethernet transmission, full‑duplex operation
Layer 2 Protocol Support
802.1Q VLAN trunking, 802.3x flow control, LACP, STP/RSTP/MSTP, EtherChannel aggregation
Interface Diagnostics
Link status detection, port error counters, DOM real-time optical telemetry, local loopback testing
High Availability
OIR hot‑swap capability on supported Catalyst chassis; link redundancy via spanning tree or port channels
Operations & Management
IOS / IOS XE CLI, SSH, SNMP v2c/v3, Syslog, DOM optical parameter polling
5. Typical Deployment Scenarios
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Campus inter-switch fiber uplinks over existing multimode building cabling
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Aggregation layer fiber connections between access and core switches
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Data center top-of-rack server and storage Gigabit fiber interconnections
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Enterprise network migration projects utilizing low-cost multimode fiber infrastructure
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Spare replacement transceiver for SFP‑based Cisco enterprise switching environments
6. Regulatory & Compliance Certifications
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Safety Standards: UL 60950‑1, IEC/EN 60950‑1, CSA C22.2 No.60950‑1
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EMC Compliance: CE Mark, FCC Part 15 Class A, ICES‑003 Class A, VCCI Class A
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Laser Safety: Class 1 Laser Product per IEC 60825‑1
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Standards: IEEE 802.3z, SFP MSA, SFF‑8472 (DOM)
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Environmental: RoHS compliant, WEEE directive compliant
7. Standard Factory Package Contents
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Cisco GLC-SX-MMD 1000BASE‑SX SFP Optical Transceiver
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Hardware installation guide
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Safety and regulatory documentation
Note: Duplex LC fiber patch cables are sold separately.
End-of-Sale Status
Cisco GLC-SX-MMD remains active and available for new orders.
Difference reminder: GLC-SX-MM = No DOM;GLC-SX-MMD = DOM/DDM Supported.
UNSPSC Classification Code
43222618 – Cisco GLC-SX-MMD 1000BASE-SX SFP multimode fiber transceiver with DOM, hot‑swappable Gigabit optical module for Cisco enterprise switches and routers.
Hardware Warranty
Original Cisco units carry Cisco limited hardware warranty; refurbished equipment follows reseller warranty terms.
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