The output is quite clear that it does not think that a serial cable is connected. Either there is a problem with the cable, there is a problem with the card, the cable used is not compatible with the card, or the software version being used is not compatible with the card being used. We do not have enough information here to know which is the most likely. Perhaps if you post the outpout of show version and of show inventory we might be able to give somewhat better answers.
The SCC in your show controllers serial output tells you about the hardware chip that works as the controller of your serial interface. That one should not be interesting for now. However, the next line says: No serial cable attached. For me, that is an indication that the interface actually does not detect any cable whatsoever.
I suggest verifying the obvious - whether the cable is indeed connected to the correct interface, whether it is okay (try changing the cable with a different piece of the same type if possible), whether it is attached properly, etc. In my opinion, this is an issue of cabling and physical connectivity.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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