1. Forum
  2. Usenet
  3. COMP.DCOM.SDH-SONET

  • SDH MULTIPLEX STUCTURES

    From Ramzi BENHAMMOUD@21:1/5 to All on Sat Feb 18 04:53:10 2017
    Hi Huub,

    There is one thing i don't understand about sdh multiplexing:
    why 3xTUG-3 are multiplexed in one VC-4 and not directly in AU-4?
    TU-12s are directly multiplexed in TUG-2, same thing for TUG-2s which are directly multiplexed in TUG-3 and not in VC-3, so why we can't do the same thing for TUG-3??

    Thanks,
    Ramzi

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Huub van Helvoort@21:1/5 to You on Sun Feb 19 16:10:47 2017
    Hello Ramzi,

    You wrote:

    There is one thing i don't understand about sdh multiplexing:
    why 3xTUG-3 are multiplexed in one VC-4 and not directly in AU-4?
    TU-12s are directly multiplexed in TUG-2, same thing for TUG-2s
    which are directly multiplexed in TUG-3 and not in VC-3, so why
    we can't do the same thing for TUG-3??


    The switching matrices in SDH equipment are at VC-n level,
    the higher order at VC-4 level and the lower order at VC-11, VC-12,
    VC-2 level.

    Mapping TUG3 directly into AU4 would bypass the VC-4 switch matrix.

    Best regards, Huub.



    --
    reply to hhelvooort with 2 'o's ================================================================
    http://www.van-helvoort.eu/ ================================================================
    Always remember that you are unique...just like everyone else...

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Ramzi BENHAMMOUD@21:1/5 to All on Tue Feb 21 12:06:29 2017
    Hello Huub,

    You wrote:

    The switching matrices in SDH equipment are at VC-n level,
    the higher order at VC-4 level and the lower order at VC-11, VC-12,
    VC-2 level.

    I think you forgot VC-3


    Mapping TUG3 directly into AU4 would bypass the VC-4 switch matrix.

    So theoretically we can do it! but for practical reasons we don't?

    Please correct me if I'm wrong, suppose we have 63xE1 tributary card cross-connected to STM-1 line card, in this case the VC-4 is structred onto 63 VC-12, so we only need to use the LO switch matrix.

    In the second case, suppose we have 2 STM-1 line cards cross-connected directly, despite the fact that each VC-4 is structred onto 63 VC-12, we only need to use the HO switch matrix.

    Thanks,
    Ramzy

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Huub van Helvoort@21:1/5 to You on Tue Feb 21 21:55:13 2017
    Hello Ramzi,

    You replied:

    The switching matrices in SDH equipment are at VC-n level,
    the higher order at VC-4 level and the lower order at VC-11, VC-12,
    VC-2 level.

    I think you forgot VC-3

    In SDH equipment the VC-3 is lower order, in SONET equipment
    VC-3 (or STS-1) is higher order.


    Mapping TUG3 directly into AU4 would bypass the VC-4 switch matrix.

    So theoretically we can do it! but for practical reasons we don't?

    If your network consists of onlt STM-1 ADMs and links it will work.
    But as sson as there are STM-N (N>1) in the network you need the VC-4.

    Please correct me if I'm wrong, suppose we have 63xE1 tributary card
    cross-connected to STM-1 line card, in this case the VC-4 is structred
    onto 63 VC-12, so we only need to use the LO switch matrix.

    Indeed, the VC-4 cross-connect consists of s single connection.

    In the second case, suppose we have 2 STM-1 line cards cross-connected
    directly, despite the fact that each VC-4 is structred onto 63 VC-12,
    we only need to use the HO switch matrix.

    Yes, some vendors call this a digital cross connect DXC.

    Cheers, Huub.


    --
    reply to hhelvooort with 2 'o's ================================================================
    http://www.van-helvoort.eu/ ================================================================
    Always remember that you are unique...just like everyone else...

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Ramzi BENHAMMOUD@21:1/5 to All on Thu Feb 23 10:00:08 2017
    Thank you Huub for your answers.

    Ramzy

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)