Anschlüsse für DSL, Amt und S<sub>0</sub>—ISDN—S<sub>0</sub> an einem Sphairon-DSL-Splitter (NT 1 Plus-Arcor), Bj. ca. 2006
<a href="//commons.wikimedia.org/wiki/User:Mattes" title="User:Mattes">User:Mattes</a>
<span class="int-own-work" lang="en">Own work</span>