Hello JL, You explained:
two questions: 1. since MLN is a special case of MRN, can we collapse this whole topic to MRN? is there a compelling reason for keeping these 2 notation?Actually a MLN is not a special case of MRN. Rather a MRN is a special case of MLN. A network comprised of VC4 and VC4-64c capable node is a MLN but not a MRN. "Layer" refers to a data plane switching layer (e.g. VC4, VC4-64c...). While "region" refers to a switching capablity (PSC, TDM...). The term MLN is used to discuss mechanisms that apply equally to layers and regions (VNT...) while the term MRN is used to discuss multi-regions specific mechanisms (e.g. Adaptation capability).
I am still confused by the definition of MRN.
Suppose I have a TDM MRN, I can distinguish in this TDM MRN e.g.
VC-12 layer switching, VC-4 layer switching, MS-n layer switching,
so according to the above all MLN.
Why is an MRN then a special case of MLN.
With the next generation nodes: Multi Service Platforms within
the same node there can also be ethernet switching on top of
the above mentioned TDM MRN and optical switching (DWDM) below
this TDM MRN....
IMO the definition of MRN will be very difficult (impossible).
I would propose to use only the MLN definition, with this layering
and partitioning a network can be described completely.
Cheers, Huub.
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