| 摘要 |
Systems (1) comprising aggregation sub-systems (14,15) and tributary sub-systems (11-13) comprising direct aggregation interfaces (31-33,41-43) for exchanging traffic with the aggregation sub-systems (14,15) get increased flexibilities by providing at least one tributary sub-system (12) with an indirect aggregation interface(35) for exchanging traffic with an other indirect aggregation interface (44) of an other tributary sub-system (11) in the system (1). Traffic can be exchanged not just between a direct aggregation interface (31-33,41-43) of tributary sub-systems (11-13) and aggregation sub-systems (14,15) but also between indirect aggregation interfaces (34-36,44-46) of tributary sub-systems (11-13). By providing at least one tributary sub-system (12) with a further indirect aggregation interface (45) for exchanging traffic with a yet other indirect aggregation interface (36) of a yet other tributary sub-system (13) in the system (1), the tributary sub-system (12) can exchange traffic with two other tributary sub-systems (11,13). The tributary sub-systems (11-13) are tributary line terminations and the aggregation sub-systems (14,15) are aggregation network terminations.
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