node called A that sends packets to an adjacent node called B. To control the packet flow to node B, node A employs a credit manager scheme in which parameters C=3(credits), C_max=4(credits) and \tao=6(msec), respectively. node A has an infinite buffer to temporarily store packets. When a packet arrives at node A, node A stores the packet at the bottom of the buffer. Node A also has a single server (transmitter). As soon as the server becomes idle, the server picks up a packet at the head of the buffer, if any, and serves the packet for packet transmission time T_p as far as there remains a credit. (The packet transmission time T_p = 4 (msec).) We observed the arrival times of the first 12 packets, denoted by aA(1)⋯A(12), which were as follows: n A(n) 1 0.5 msec 2 1.0 3 1.5 4 2.0 5 4.5 6 5.5 7 6.5 8 12.5 9 13.0 10 13.5 11 14.0 12 14.6

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
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Consider a node called A that sends packets to an adjacent node called B.

To control the packet flow to node B, node A employs a credit manager scheme in which parameters C=3(credits), C_max=4(credits) and \tao=6(msec), respectively.

node A has an infinite buffer to temporarily store packets.

When a packet arrives at node A, node A stores the packet at the bottom of the buffer.

Node A also has a single server (transmitter). As soon as the server becomes idle, the server picks up a packet at the head of the buffer, if any, and serves the packet for packet transmission time T_p as far as there remains a credit. (The packet transmission time T_p = 4 (msec).)

We observed the arrival times of the first 12 packets, denoted by aA(1)⋯A(12), which were as follows:

n A(n)
1 0.5 msec
2 1.0
3 1.5
4 2.0
5 4.5
6 5.5
7 6.5
8 12.5
9 13.0
10 13.5
11 14.0
12 14.6

1.

Let R(n) denote the departure time of the n th packet from the buffer for n∈{1,2,...}. Find R(n) for n∈{1,…,12}

2.

Define the delay of the n th packet by D(n) = R(n) - A(n) for n∈{1,2,...}. Find D(n) for n∈{1,…,12}

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