User Manual
Product information and planning
9500 MPR Rel. 3.1
3DB18809AAAA Issue 1 173/980
Figure 82. Example of traffic in case of 28MHz bandwidth and modulation downgraded to 16QAM
When the modulation is further degraded to 4QAM (Figure 83.), the E1 flows are still kept whilst the Ether-
net traffic with the lowest priority is dropped (Fast Ethernet traffic #2) and the Ethernet traffic with the high-
est priority is reduced (Ethernet traffic #1) to fit the remaining available bandwidth.
Figure 83. Example of traffic in case of 28MHz bandwidth and modulation downgraded to 4QAM
2.8.14.4 Adaptive modulation and admission control disabled
The E1 flows are no more guaranteed traffic when the operators disable the admission control. The max-
imum number of E1 links that can be cross-connected into a given radio direction is the one that is fitting
with 16QAM capacity but without any survival when the modulation scheme is degraded.
N.B. As all the E1 links have the same priority, it is not possible, from a system point of view, to decide
"which" E1’s should be dropped when the modulation scheme is degraded from 16QAM to
4QAM. To secure provisioning and commissioning operations, the admission control check
at WebEML level has been inserted, avoiding a possible mistake from the user to provision a
number of E1’s that are not fitting inside16QAM bandwidth.
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