Modul 508 (Links)
a/b Port 1 = Internnummer 11
a/b Port 2 = Internnummer 12
a/b Port 3 = Internnummer 13
a/b Port 4 = Internnummer 14
a/b Port 5 = Internnummer 15
a/b Port 6 = Internnummer 16
a/b Port 7 = Internnummer 17
a/b Port 8 = Internnummer 19
Module 524 (Mitte)
schaltbarer SO1 = Internnummer 97
schaltbarer SO2 = Internnummer 98 + Systemtelefon 18
a/b Port 1 = Internnummer 20
a/b Port 2 = Internnummer 21
a/b Port 3 = Internnummer 22
a/b Port 4 = Internnummer 23
Modul 540 (Rechts)
SO1 = NTBA 1
SO2 = NTBA 2
SO3 = NTBA 3
SO4 = NTBA 4