Looks like a very old landline since it still has the post icon on it. So it’s got to be from before 1995 when the Telekom was foundet.
The right one is a “TAE” phone socket, the standard type of analog landline telephone socket used in Germany. Analog telephone service is no longer offered, but DSL uses the same cabling and the same sockets. The socket itself is type “F” (the extended notches are in the bottom), which is the variant used plugging in a phone. They also come in type “N” (extended notches in the 3rd position from the bottom, for an answering machine, fax, modem, or similar non-phone accessories), type “U” (both sets of extended notches, so it can fit plugs of either type), and in multi-socket configurations, most commonly “NFN” and “NFF”. TAE plugs of modern DSL modems often come in a variant without any spikes, so they fit all three types of socket.
The left one switches something. It is currently set to setting “S” (diagonal). Turning it horizontal (try gently with a screwdriver, I don’t believe it needs a special key) switches it to setting “N”. No idea what exactly it switches or what the two settings N and S are supposed to represent.
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ISDN
Looks like a very old landline since it still has the post icon on it. So it’s got to be from before 1995 when the Telekom was foundet.
The right one is a “TAE” phone socket, the standard type of analog landline telephone socket used in Germany. Analog telephone service is no longer offered, but DSL uses the same cabling and the same sockets. The socket itself is type “F” (the extended notches are in the bottom), which is the variant used plugging in a phone. They also come in type “N” (extended notches in the 3rd position from the bottom, for an answering machine, fax, modem, or similar non-phone accessories), type “U” (both sets of extended notches, so it can fit plugs of either type), and in multi-socket configurations, most commonly “NFN” and “NFF”. TAE plugs of modern DSL modems often come in a variant without any spikes, so they fit all three types of socket.
The left one switches something. It is currently set to setting “S” (diagonal). Turning it horizontal (try gently with a screwdriver, I don’t believe it needs a special key) switches it to setting “N”. No idea what exactly it switches or what the two settings N and S are supposed to represent.
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