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following issues can think in case of Traffic on Iu interface:
# Total traffic bandwidth on Iu interface = voice service bandwidth + data
service bandwidth + video service bandwidth = total number of MSC
subscribers (k) * [average traffic per voice subscriber in busy hours (ERL) *
ATM bandwidth of only voice service (kbit/s) + average traffic per data
subscriber in busy hours (ERL) * ATM bandwidth of only data service (kbit/s)
+ ratio of video telephony subscribers * average traffic per video telephony
subscriber in busy hours (ERL) * ATM bandwidth of only video telephony
service (kbit/s)]
# Bandwidth of traffic to RNC (Mbit/s) = ratio of RNC traffic * total bandwidth of
traffic on Iu interface (Mbit/s)
# Number of PVCs to RNC = ROUNDUP (bandwidth of traffic to RNC (Mbit/s) /
redundant factor of ATM traffic / PV bandwidth of ATM traffic) | 
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