A SS7 (C7) Signalling Link should be dimensioned so that it can handle a maximum signalling load of 40%. The value six is a weighting factor. MSUs supports the different SS7 messages: IAM, IFAM (BTNR 167), ANS, REL, CPG, etc..
Link sets should be dimensioned so that they contain a maximum of 16 signalling links. An odd configuration will lead to an imbalance with the load distribution.