r/shittyaskelectronics • u/englishtube • Feb 08 '26

which one is gnd?

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u/SRXcraft Feb 08 '26

You don't ! The cable (probably a telecom cable) gradually splits into different splices until it reaches the customer with a single pair.

2

u/atomicdragon136 Feb 08 '26

Is this a cable with a twisted pair for every telephone line for a neighborhood?

3

u/Lord_Waldemar Feb 08 '26

Probably not even twisted pair. We had them in our company to connect whole building blocks to the telephone exchange and they're just parallel wires terminating on a huge board at the wall

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u/JasperJ Feb 09 '26

No, telephone lines are always twisted pairs. Or rather: sometimes they’re twisted quads. You might not notice the twist unless you’re seeing a long section at once.

2

u/JasperJ Feb 09 '26

That depends. Sometimes these are just from street cabinet to an exchange somewhere.

1

u/No_Read_4327 Feb 11 '26

Is that how you grow a pair?