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by sanjeevan on December 16th, 2006

sanjeevan

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Define the following parameters for a switching network. N = number of hops between two given end systems L = message length in bits B = data rate in bits per second, on all links P = fixed packet size, in bits H = overhead (header) bits per second S = ca

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  • by sanjeevan on December 16th, 2006

    sanjeevan

    Number of hops between 2 given end systems (N)
    In a switching network a hop means the link between 2 consecutive nodes. Therefore, number of hops means number of links between 2 given end systems.

    Message length in bits (L)
    This is the total number of bits of the message to be sent.

    Data rate in bits/sec (B)
    Data rate is the speed with which data can be transmitted from one device to another.

    Fixed packet size (P)
    In packet switching, the message to be transmitted is broken into series of packets (parts of a certain size in bytes). This packet contains both data and control information and the total no. of bits in a packet is given by the fixed packet size.

    Overhead bits per packet (H)
    In packet switching each packet contains a portion of (or all for a short message) of the users data plus some control information. The control information includes the information that the network requires to be able to route the packet through the network and deliver it to the intended destination. These control information are called overhead bits.
    Call set-up time (S)
    -is the overall length of time required to establish a call between terminals using circuit switching or virtual circuit packet switching; i.e. the time from the initiation of a call request to the beginning of the call message.

    Propagation delay per hop in seconds (D)
    Once a bit is pushed to onto a link, it needs to propagate to the next node. The time required to propagate from the beginning of a link to the next node is called as propagation delay. The bit propagates at the propagation speed of the link and the propagation speed depends on the physical medium of the link.
    Propagation delay per hop= (distance between 2 nodes ) / (the propagation speed)

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