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mdoggendorf
PostPosted: Mon Apr 15, 2024 8:48 pm 

Joined: Mon Apr 15, 2024 8:23 pm
Posts: 1
I’m scrapping a bunch of communications equipment from the early 90’s and I have a few of these boards which were used to connect banks of external modems. How should I classify these?

Also all of the ports had these connected to them before the cable from the modem. I think they are some sort of line filter/signal booster. How should I classify them?


Attachments:
File comment: Back of line filter card.
IMG_1954.jpeg
IMG_1954.jpeg [ 2.14 MiB | Viewed 135 times ]
File comment: Front. Some sort of line filter card that was attached to each port.
IMG_1953.jpeg
IMG_1953.jpeg [ 2.22 MiB | Viewed 135 times ]
File comment: The back.
IMG_1952.jpeg
IMG_1952.jpeg [ 2.2 MiB | Viewed 135 times ]
File comment: The front. 25 pin serial port ends are soldered on.
IMG_1951.jpeg
IMG_1951.jpeg [ 2.49 MiB | Viewed 135 times ]
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Meowpher the 10th
PostPosted: Sun Apr 28, 2024 10:01 am 

Joined: Mon Nov 14, 2022 4:38 pm
Posts: 65
I don't see anything that indicates backplane. A back plane must have at least two slots for cards. I think these will go as connector ends, unless there is something special in the filter chips.
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