SPDIF cable same as coaxial cable?

Most people when they say coax mean the digital connection with RCA plugs, optical they say toslink. There is a XLR digital connection as well AES3 which SPDIF is based on. 

xlr cables seem to have limited bandwidth to 192. I am exploring more bandwidth and coaxial seems to be a lot better short of usb which seems to be best.

not sure what lies beyond 192.  

There are many types of coaxial cable. SPDIF cables are typically made of coaxial cable ("coax") with a 75-ohm characteristic impedance.

Regarding bandwidth, the SPDIF specs and those of the receiving and sending units are more likely to limit bandwidth than the actual cable used.

What lies beyond 192?  Opinions vary widely. Mine is that beyond 24/96, there is little or nothing added other than marketing fluff.

 I believe  all digital connections are limited to 24/192 except USB, any I2S implementation or ethernet. Someone else will need to chime in on what's best, redbook CD, 24/96 or 24/192 is very hard for me to tell much difference. 

I used a spare RCA interconnect (nominally 50Ω) for Spdif when I first got a DAC, it worked but a cable designed for the job but with RCAs on both ends was quite an improvement and a 75Ω cable with BNC connectors (Belden 4794R) better still even though it was designed for 12G SDI video and I had to use an adaptor at the DAC end because Rega didn’t see fit to put a BNC socket to their DAC. I think they were all coax cables.