Page 1451 - 5G Basics - Core Network Aspects

Signalling aspects 3

– Inter-connection via virtualized switches. Multiple aggregated switches can be inter-connected and
stacked into one virtualized switch. The OLT connects every physical switch directly, which forms a
virtual trunk. Compared to the last scenario, multiple physical aggregated switches are virtualized
into a logical switch and form a logical network topology.

– Inter-connection via switches with full-mesh connections. Each aggregated switch needs one link to
connect each member of the BNG pool. This networking method will increase CAPEX, and require
more transmission resources. However, such a full-mesh network topology does exist in the current
carrier network.
– Inter-connection via the OTN network. When the OTN network is deployed between the BNG layer
and the OLT layer, it will be an ideal networking method for the BNG pool. This mode can greatly
reduce the consumption of transmission resources and device ports, and is the trend for the future
network.
Of the above networking methods, the networking method based on the virtualized switch is recommended
currently, since it has the advantages of the simplified logical network topology and OAM for aggregated
switches. When the OTN network is deployed in the metro area in the near future, the networking method
based on metro-OTN is recommended, since it can greatly reduce the consumption of transmission resources
and device ports. However, other networking methods can also be considered based on the practical network
resources.

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