Have for example thousand OKer than 1Gbps of signal of aether net client map arrives in 7 STM-1 (7*155.5Mbps=1088Mbps) , bandwidth utilization rate is amounted to 92% . If use traditional method to need a STM-16 (2.488Gbps) , meeting waste makes an appointment with the fixed bandwidth of 60% . Watch 1 give out the efficiency that uses VC empty cascade.

When using empty cascade technology, data clean carry on one's shoulder will be torn apart, comprise VCG, pass two or many method are transmitted in SDH network. Because of this two or the distance of many method and the network that its method includes yuan amount all cannot identical, reason VCG member arrives at terminus impossibly at the same time; After compensation meantime delays difference, equipment receiving end must recombine clean carry on one's shoulder again. Poor time-sharing is delayed cause by different element; It is the method that as a result of VCG each member passes firstly the distance is different, it is relatively fixed that the poor time-sharing that causes from this is delayed, facilitating compensation. But the poor time-sharing that be adjusted by SDH network finger or transmits link to protect changeover automatically to cause is delayed, be change, compensate not easily. Decided by the MFI parameter of the definition in ITU-T standard the biggest permission poor time-sharing is delayed is 256ms, but this just is theoretical value; Even if is unfavorable also below circumstance of the evilest intense use this value. The network that equipment manufacturer needs to decide they are produced yuan can compensate how old poor time-sharing actually to delay. Because need the test that time-sharing delays and analysis, undertake compensating when network installation is debugged, it is very important. (to be continued)

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