In the diagram below, the two users are connected using two B channels in parallel. The ISDN is able to route these B channels independently, because it takes no account of the fact the both channels connect the same pair of users.

The speed of the two B channels is identical.

The time it takes for data to travel from one end of the channel to the other is, however, different.

One user transmits two items of data simultaneously. One is sent in the B channel which is routed via satellite; the other is sent in the B channel which takes the direct route. Will both items of data arrive at the same time?