Used telecom equipment?!

Hello from the Eighth Doctor I need to find the modules that were supplied by Bell Telephone with their slow speed Modems, just before 2400 Baud ones were announced. They were found with

300 Baud and 1200 Baud half duplex, also with 1800 Baud, and sometimes the 600 Baud ones, sorry can't recall what they were. Problem is, I can't remember their names, only what they were typically partnered with.

I need to buy four of them to replace ones that are still being used by a customer who refuses to upgrade to faster links, either DSL or dialup, or something else.

Not surprisingly I also need to track down a crowd of MTU devices, (Maintenance and Termination Units), if pressed I can track down the specific number for them, since it came up in an older version of then Lucent Semiconductor's Analog Line Cards data book. (At least I think I saw one there, it certainly gave the name.) The sales facility should have offices in either NYC, or NJ or CT. Or have sales people in this area, if the sales facility isn't in the aforementioned locations.

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The Eighth Doctor
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