求教一个关于通信网的问题

qinguanqin

In token ring network, each station interface in listen mode
imposes a constant delay (minimum of 1-bit delay) between its input line and output
line.
1. Is there any effect on the delay if data frames are removed by receiver instead of
transmitter? Discuss.
2. Suppose some stations in a token ring network may be power down at night, and
the corresponding delay in the station interface is removed. Is there any
consequence on the operation of the token ring network. Discuss.