• Question about connection function

    From e.bagherzadeh72@gmail.com@21:1/5 to All on Mon Oct 15 03:34:49 2018
    Dear Huub van Helvoort,

    I have some doubts about connection function. I would appreciate if you could give me some hint and assistance.
    - I wonder if the connection function in ITU-T standard definition is a function for every inputs and output and all over MI configurations have been set for this or there is more than one connection function which is defined for every input and output
    which we want to connect.
    - There are such MI parameters as connection type, directionality, and connection port id.
    connection port id seems not to be a user-settable parameter because in 7.1 table (G.806) is not mentioned. so, in my idea, this parameters is internal and is used for specification of the ports.
    - I think connection type and directionality parameters are specified as long as the user defines a connection and they can not be changed but the so-called connection is removed entirely. for example, if directionality is unidirectional and we want to
    change it to bidirectional we must remove this connection and define it again with new parameters.
    - The AI-TSF and AI-TSD are conditional defects of the SNCP/N(SF and SD respectively.)
    SNCP runs in Sn-C or Sm-C function,
    on the other way, it is always noted that connection input and output is CI. so how can we explain about the AI which is the input of the connection?

    Best Regards,
    Elnaz

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  • From Huub van Helvoort@21:1/5 to You on Tue Oct 16 15:39:56 2018
    Dear Elnaz,

    You write:

    I have some doubts about connection function.
    I would appreciate if you could give me some hint and assistance.

    Ok, I will try.

    - I wonder if the connection function in ITU-T standard definition
    is a function for every inputs and output and all over MI
    configurations have been set for this or there is more than one
    connection function which is defined for every input and output
    which we want to connect.

    Generically there are separate connection functions per CI type,
    i.e. a connection function for VC-4, another for VC-3, and another
    for VC-12... at least from a management point of view.
    Hardware can combine them in a single block.

    In principle all VC-n input ports and output ports are connected
    by the VC-n connection function.
    However there can be hardware/implementation restrictions.
    The management system should be aware of these restrictions.


    - There are such MI parameters as connection type, directionality,
    and connection port id.
    connection port id seems not to be a user-settable parameter
    because in 7.1 table (G.806) is not mentioned. so, in my idea,
    this parameters is internal and is used for specification of the ports.

    Indeed port id is normally fixed in the hardware.
    In a network a port may have a name, this network name is translated
    bij the equipment manager into a port id.

    - I think connection type and directionality parameters are specified
    as long as the user defines a connection and they can not be changed
    but the so-called connection is removed entirely. for example, if
    directionality is unidirectional and we want to change it to
    bidirectional we must remove this connection and define it again with
    new parameters.

    Indeed. Although there may be clever management software that adds a unidirectional connection in the oposite direction to an existing unidirectional connection to make it a bi-directional connection.

    - The AI-TSF and AI-TSD are conditional defects of the SNCP/N(SF > and SD respectively.)
    SNCP runs in Sn-C or Sm-C function,
    on the other way, it is always noted that connection input and
    output is CI. so how can we explain about the AI which is the
    input of the connection?

    The adaptation function translates the AI-TSF into CI-SSF and AI-TSD
    into CI-SSD.

    Kind regards, Huub.


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