Alcatel-Lucent 9500 MXC, Руководство пользователя

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Chapter 3. 9500 MXC Nodes
Vol. II-3-8 Alcatel-Lucent
Capacity Assignment
The backplane bus setting of Nx2 Mbps (2.048 Mbps), Nx1.5 Mbps (1.544
Mbps) or Nx150 Mbps (155.52 Mbps) determines the capacity multiples used to
configure the required Ethernet capacity.
The Ethernet capacities selected, along with any TDM capacity, must in turn be
supported within the radio or fiber link capacities that the traffic is
cross-connected to.
The total capacity must also be supported by the backplane bus, which is
particularly relevant where two or more links are operated from one INU. One
INU supports maximums of 204 Mbps for an Nx2 Mbps selection, 154 Mbps for
Nx1.5 Mbps, or 311 Mbps for Nx150 Mbps.
2 Mbps or 1.5 Mbps Backplane Selection
On a radio link multiples of 2 Mbps or 1.5 Mbps assignments are configured to
transport Ethernet, with or without E1 or DS1 side traffic, to a 200 Mbps nominal
maximum for an NxE1 backplane, or 150 Mbps for an NxDS1 backplane.
On a fiber link it is to a maximum of 130 Mbps.
This link capacity assignment between Ethernet and E1/DS1 traffic is fully
scalable in 2 Mbps or 1.5 Mbps steps to optimize throughput granularity for
network planning.
Figure 3-6 illustrates bandwidth assignment on a radio link for an Nx2 Mbps
backplane, demonstrating how for a selected aggregate link capacity the scaling
is used to assign Ethernet and companion E1 capacity.
Figure 3-7 illustrates the equivalent bandwidth assignment options for an Nx1.5
Mbps backplane selection.