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Parity setting for W98SE Modem?

Discussion in 'Earlier Versions of Windows' started by Gary R, Dec 8, 2001.

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  1. Gary R

    Gary R Thread Starter

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    Do the parity settings for a Modem have any effect on how fast it sends / receives data with a Dial-up connection :confused:
    The W98SE default setting's for the Intel HaM Modem (56K) in my comp are:
    :
    8 - Data
    0 - Parity
    1 - Stop
     
  2. DoyceJ

    DoyceJ

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    That is the standard setting. I dont recall anything ever being mentioned about changing it to help with speed. I found this for you.

    In communications, parity checking refers to the use of parity bits to check that data has been transmitted accurately. The parity bit is added to every data unit (typically seven or eight bits ) that are transmitted. The parity bit for each unit is set so that all bytes have either an odd number or an even number of set bits.

    Assume, for example, that two devices are communicating with even parity (the most common form of parity checking). As the transmitting device sends data, it counts the number of set bits in each group of seven bits. If the number of set bits is even, it sets the parity bit to 0; if the number of set bits is odd, it sets the parity bit to 1. In this way, every byte has an even number of set bits. On the receiving side, the device checks each byte to make sure that it has an even number of set bits. If it finds an odd number of set bits, the receiver knows there was an error during transmission.

    The sender and receiver must both agree to use parity checking and to agree on whether parity is to be odd or even. If the two sides are not configured with the same parity sense, communication will be impossible.

    Parity checking is the most basic form of error detection in communications. Although it detects many errors, it is not foolproof, because it cannot detect situations in which an even number of bits in the same data unit are changed due to electrical noise. There are many other more sophisticated protocols for ensuring transmission accuracy, such as MNP and CCITT V.42.

    Parity checking is used not only in communications but also to test memory storage devices. Many PCs, for example, perform a parity check on memory every time a byte of data is read.
     
  3. Dan O

    Dan O

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    No, and for most PC communications it is not a option. This is because it is not supported by most hosting computers or the communication protocol being used by the PC, such as PPP.
     
  4. DoyceJ

    DoyceJ

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    Thanks Dan O. I figured that but wasnt sure enough to make the leap to a definitive answer. :)
     
  5. Dan O

    Dan O

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    No problem. I have been in telecom and computers for years.
     
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