會英文的...可不可以再幫偶翻一下
1. What is the purpose of the timer at the sender site in system using ARQ?
The sender sets a timer when a frame is sent. If an acknowledgment is not received by the time the timer expires, the frame is re-transmitted.
2. Stop and wait ARQ has two control variables S and R.What are their functions?
S is a variable at the sender end that holds the number of the recently sent frame. R is a variable at the receiver end that holds the number of the next frame expected.
3.Name the three types of Channelized Multiple-access Protocols?
FDMA, the bandwidth is divided into channels.
TDMA, the bandwidth is just one channel that is timeshared.
CDMA, one channel carries all transmissions simultaneously.
謝謝!!!!我翻了三面....就剩下這些我不會>w<....請幫幫偶>0<
The sender sets a timer when a frame is sent. If an acknowledgment is not received by the time the timer expires, the frame is re-transmitted.
2. Stop and wait ARQ has two control variables S and R.What are their functions?
S is a variable at the sender end that holds the number of the recently sent frame. R is a variable at the receiver end that holds the number of the next frame expected.
3.Name the three types of Channelized Multiple-access Protocols?
FDMA, the bandwidth is divided into channels.
TDMA, the bandwidth is just one channel that is timeshared.
CDMA, one channel carries all transmissions simultaneously.
謝謝!!!!我翻了三面....就剩下這些我不會>w<....請幫幫偶>0<