As a simple example, we show how four stations share the link during a 1-bit interval. The procedure can easily be repeated for additional intervals. We assume that stations 1 and 2 ate sending a 0 bit and channel 4 is sending a I bit. Station 3 is silent. The data at the sender site are translated to -1, -1,0, and +1. Each station multiplies the corresponding number by its chip (its orthogonal sequence), which is unique for each station. The result is a new sequence which is sent to the channel. For simplicity, we assume that all stations send the resulting sequences at the same time. The sequences on the channel is the s-um of all four sequences as defined before. Figure 12.26 shows the situation.