· Sistem Penghantaran Il. Circuit switching Pensuisan Litar Ill. Signaling System Sistem...
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· Sistem Penghantaran Il. Circuit switching Pensuisan Litar Ill. Signaling System Sistem Pengisyaratan B. c. D. Subscriber Loop Gelung Pengguna 1 and 11 1, 11 and IV 1, 111 and