The Standard Teleporter - from The QuakeLab is a Single Player level. There is no in-game name for this level, the name comes from documentation included with the level.
Walkthrough
Go through the Teleporter to your right. You will land on a block behind and to the right of the starting location.
Gallery
The Standard Teleporter - from The QuakeLab
Alternate Versions
Aftershock for Quake version using the Aftershock Level Theme. Note it does not exist in the DOS level selection menu, it must be accessed manually.
The Standard Teleporter - from The QuakeLab (Aftershock)