Cisco GLC-ZX-SMD Full Official Product Description
1. Part Number & Naming Definition
Official Full Name
Cisco 1000BASE-ZX SFP Single-Mode Optical Transceiver Module, 1550nm, DOM Support, Extended Temperature
SKU:GLC-ZX-SMD
Naming Breakdown
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GLC: Gigabit Ethernet Small Form-Factor Pluggable Transceiver
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ZX: Ultra Long-Reach 1000BASE-ZX single-mode optical specification
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S: SFP Form Factor
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M: Extended Temperature Operation
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D: Digital Diagnostic Monitoring (DOM/DDM) Supported
Core Product Positioning
The Cisco GLC-ZX-SMD is a hot‑swappable SFP optical transceiver for ultra-long-distance Gigabit Ethernet transmission over standard single-mode fiber (SMF). Operating at 1550 nm with a DFB laser, it delivers extended reach for metropolitan backbone, inter-campus and remote site inter-switch links. This model supports DOM/DDM for real-time monitoring of optical operating parameters.An inline optical attenuator is mandatory for fiber spans shorter than approximately 25 km to prevent receiver overload.It works with Cisco switches, routers and firewalls equipped with SFP slots.
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 with SFP slots.
Supported IOS / IOS XE Versions
All mainstream Cisco IOS and IOS XE releases supporting SFP and DOM functionality.
Supported Fiber Type
Single‑Mode Fiber (OS1/OS2, 9/125μm) only; incompatible with multi-mode fiber
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 & SFF‑8472(DOM)
Optical Interface
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Nominal Wavelength: 1550 nm (DFB Laser)
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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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Standard OS1/OS2 single‑mode fiber: Up to70 km(subject to fiber attenuation, splices and connectors)
Optical Power Budget
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Transmit Power: 0 dBm ~ +5 dBm
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Receiver Sensitivity: Minimum -23 dBm
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Maximum Allowable Received Power: -3 dBm
Digital Diagnostics
DOM / DDM (Digital Diagnostic Monitoring) Supported
Monitors module temperature, supply voltage, laser bias current, transmit optical power, receive optical power.
Environmental Operating Parameters (Extended Temperature)
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Operating Temperature:-5°C ~ +85°C (23°F ~ 185°F)
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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, 8b/10b line coding
Layer 2 Protocol Support
802.1Q VLAN trunking, 802.3x pause frame flow control, LACP, STP/RSTP/MSTP, EtherChannel link aggregation
Interface Diagnostics
Link status detection, packet 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 logging, DOM optical parameter polling
5. Typical Deployment Scenarios
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Long-distance inter-building campus backbone fiber connections over single-mode fiber
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Metropolitan Area Network (MAN) Gigabit inter-switch links for geographically distributed sites
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Remote enterprise and industrial site interconnections within the 70 km reach range
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Leased dark single-mode fiber wide-area network deployments
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Spare replacement transceiver for SFP‑based Cisco enterprise switching and routing 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
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Environmental: RoHS compliant, WEEE directive compliant
7. Standard Factory Package Contents
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Cisco GLC-ZX-SMD 1000BASE‑ZX SFP Optical Transceiver
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Hardware installation guide
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Safety and regulatory documentation
Note: Duplex LC fiber patch cables and optical attenuators are sold separately.
End-of-Sale Status
Cisco GLC-ZX-SMD remains active and available for new orders.
Difference reminder: GLC-ZX-SM = Commercial Temperature, No DOM;GLC-ZX-SMD = DOM/DDM + Extended Temperature Range.
UNSPSC Classification Code
43222618 – Cisco GLC-ZX-SMD 1000BASE-ZX SFP optical transceiver with DOM, hot‑swappable ultra-long-reach single-mode Gigabit fiber module for Cisco enterprise switches and routers.
Hardware Warranty
Original Cisco units carry Cisco limited hardware warranty; refurbished units follow reseller warranty terms.
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