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Table of Contents 
1 Product Overview ······································································································································1-1 
Introduction ·············································································································································1-1 
3Com Baseline Switch 2920-SFP Plus···································································································1-3 
Front Panel ······································································································································1-3 
Rear Panel·······································································································································1-3 
Power Supply System ·····················································································································1-3 
Cooling System ·······························································································································1-3 
3Com Baseline Switch 2928-SFP Plus···································································································1-4 
Front Panel ······································································································································1-4 
Rear Panel·······································································································································1-4 
Power Supply System ·····················································································································1-4 
Cooling System ·······························································································································1-4 
3Com Baseline Switch 2952-SFP Plus···································································································1-5 
Front Panel ······································································································································1-5 
Rear Panel·······································································································································1-5 
Power Supply System ·····················································································································1-5 
Cooling System ·······························································································································1-5 
3Com Baseline Switch 2928-PWR Plus ·································································································1-6 
Front Panel ······································································································································1-6 
Rear Panel·······································································································································1-6 
Power Supply System ·····················································································································1-6 
Cooling System ·······························································································································1-6 
3Com Baseline Switch 2928-HPWR Plus·······························································································1-7 
Front Panel ······································································································································1-7 
Rear Panel·······································································································································1-7 
Power Supply System ·····················································································································1-7 
Cooling System ·······························································································································1-8 
Ports························································································································································1-8 
Console Port····································································································································1-8 
10/100/1000Base-T Ethernet Port···································································································1-8 
1000Base-X SFP Interface··············································································································1-9 
LEDs······················································································································································1-10 
Power LED ····································································································································1-10 
RPS Status LED ····························································································································1-10 
Port Mode LED ······························································································································1-11 
10/100/1000Base-T Auto-Sensing Ethernet Port Status LED·······················································1-11 
1000Base-X SFP Interface Status LED ························································································1-13 
2 Installation Preparations···························································································································2-1 
Safety Precautions ··································································································································2-1 
Installation Site········································································································································2-1 
Temperature/Humidity·····················································································································2-1 
Cleanness········································································································································2-1 
Electromagnetic Susceptibility·········································································································2-2