The diagram represents the communication system for Signals Regiment South. The regiment was controlled by Meldekopf Vienna, the central communication control station for the whole regiment. Each radar or intercept out-station would communicate with the Meldekopf either via direct telephone line by teleprinter when it was available, or by radio link when direct telephone lines were not available, usually later in the war.
Own work
This file was derived from: Luftwaffe HF Baselines in Central Mediterranean.svg
Derived from;

https://docs.google.com/file/d/0B7sNVKDp-yiJdGRmNmctUzdZS1UInformation from:

Scope creep
Goran tek-en, following request by Scope creep