There are many different data cables types for Nokia phones with different specification.
See the basic components of a cellular phone
The range of mobile phones processors is much as large as the amount of CPUs for personal computers. Nokia used standard RISC processors in older and standard phones, today there are Texas instruments OMAP CPU inside newer smartphones like Nseries, Eseries or Communicator
The ASIC type is a very important factor for calculating unlock codes for nokia mobile phones.