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Connect T3/E3 BNC COax to 3900 Router

I need to connect a coaxial cable from our ISP hardware to our 3900 Cisco Router. It's a T3/E3 connection. On the ISP hardware there is an IN/OUT and on the module in the back of the router there is an RX and TX. There are 2 connectors at each end.  Which connection configuration is the correct one?
Networking Hardware-OtherRouters

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8/22/2022 - Mon

CCIDover, Should be BNC connections, unless the line card or your ISP uses SMB, which isn't used much.

I would grab one from cables and kits: http://www.cablesandkits.com/cisco-coaxial-ds3-cable-bnc-male-bnc-male-cabatmds3e3-p-628.html

I guess I forgot to mention the ends are BNC. There are just 2 connectors on each end.

On the network ISP hardware there 2 plugs in/out and on the module for the router there are two plugs RX/TX.

Im just not sure if In goes on RX or TX.

My post above still is correct then. That cable is what you need.

From the ISP, they should have TX/RX ports. If not just try it, if you have no connection, then flip them. They only work one way.
Your help has saved me hundreds of hours of internet surfing.

Well yes you stated correctly what I needed which  was that cable I already had.

I'm trying to get it right the first time without having to flip. I might not be here when the Network engineer attempts to connect to it and configure the hardware.

If I wanted to "guess" I wouldn't have submitted this question?

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