ZyXEL Communications ES-2048 - Manual (Page 15)

ES-2000 Series Switch Support Notes
All contents copyright (c) 2006 ZyXEL Communications Corporation.
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5. Remove both side of the protection cap from the LC/LC Fiber Cable.
6. Plug the LC/LC Fiber Cable into the transceivers on both ES-2108-LC and
GS-4024 Switch.
If you connected the cable correctly, the LED of the “LINK” will light up.