| 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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