en.wikipedia.org/wiki/E-carrier
E1 is a standard that uses 32 TS onto a 2Mb/s link.
If you want to use a 2Mb/s link without this “32 timeslots” structure it is possible, but then it is not an E1 anymore. It’s just a copper cable. And you’ll have to define a new LAYER-1 protocol in order to carry data.