The SS7 Link can be provision as :
Physical interface ( V35/DS0)
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1. 64Kb
Using a SSP/DS-0 (64K) and provision as 56Kb in( SSP/STP).
2. 56Kb
Using a PSTN /56K via CSU/DSU.
provision as 56Kb in ( SSP/STP)
In regards to MSU
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these mesaage vary in lenght, and the follwoing avarage are assumed :
1. IAM : 45 Octets/message
2. ACM,ANM,REL,RLC : 20 Oct/m