2.as bits come back around the ring, they are removed by the sender. there is no limit on the size of the packets., because the entire packet never appears on the ring at one instant.3.after transmitting the last bit of its message, the station must regenerate the token. after the last data bit has cirled the ring and has been removed, the interface is switched back to the listen mode.4.contention is not possible with a token ring system. during heavy traffic, as soon as a token is regenerated, the next downstream station requiring service will see and remove the token. thereby, permission to transmit rotates smoothly around the ring. since there is only one token , there is no contention.the ring itself must have sufficient delay to enable a complete token to circulate when all stations are idle. a major issue in ring network design is the propagation dis tance or lenth of a bit . if the data rate is r mbits/s , a bit is emitted every microseconds. since the propagation rate along a typical coaxial cable is 200m/us, each bit occupies 200/r meters on the ring
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