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الواجب الأول 1⃣✅ ---------------------------------------------------------------------- Exercise (1): Given A periodic digital signal. If a pulse width is 40μs and a period of 160 μs. Determine its frequency, bit rate and duty cycle. How could you increase the bit rate by 50%? ---------------------------------------------------------------------- Exercise (2):  Consider Bit rate  100kbps, Packet size 2000bits, what is the time required to send 5 successive packets (i.e., total transmission time) if the time  interval is 10μsec? Hint: Packet size=(Packet length including header +Data+ trailer)= 2000bits ---------------------------------------------------------------------- Exercise (3):           Use  (1) Timing Diagram Method                 (2) Formulas Method Consider three intermediate nodes between A and B users, hop interval for each packet is 5sec. Determine       1- Transmission time for sending 10 packets using Packet-switching.       2- If the message consists of 5 packets, what is transmission time of Message-Switching.       3- Which transmission is the best?   ---------------------------------------------------------------------- Exercise (4): Consider  One file of K>>1 bits must be sent from A to C. The file is decomposed into packets of P bits each. Each packet contains 16 error-control bits, 32 bits of address and sequence number, in addition to the P data bits. 1- How many packets can be transmitted; if K=500Bytes and maximum packet size is 1000bits? Show each packet format.      2- If the hop time for each packet is 1sec, what is the total time required to send this file over a network of three nodes,  from Source         to Destination. Source  Node A  ---- Intermediate Node B ---Destination C

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