3Com 3C17700 - SuperStack 3 Switch 4900 Getting Started Manual - page 62
Manual is about: Getting Started Guide
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62
A
PPENDIX
A: S
AFETY
I
NFORMATION
WARNING: Fiber Optic ports - Optical Safety
Never look at the transmit laser while it is powered-up. Never look
directly at the fiber ports and fiber cable ends when they are
powered-up.
WARNING: Use of controls or adjustments of performance or procedures
other than those specified herein may result in hazardous laser emissions.