The Air interface for the CDMA was totally different from previous systems. The IS 95 forward link and the IS-95 reverse link are different in their construction in view of the fact that there are different requirements for each. The IS-95 air interface is based around the use of CDMA within a 1.25 MHz channel. Using this, the system can use the same channel for a large number of signals; each one allocated a different code to access the system.