Séquential Couleur Avec Mémoire (SECAM)

user-defined list of acceptable telephone numbers. Calls from those numbers are diverted to a recorded message. Calls from all other numbers ring through, as usual. See also call block, CLASS, and PSTN.

• 218–219 MHz Service
• 22
• 23B+D
• 23B+D
• 24
• 256-QAM
• 2.5 Gbps
• 2.5 Gbps
• 2.5 Gbps
• 2.5G (Two point Five Generation)
• 26
• 28
• 2B1Q (2 Binary 1 Quaternary)
• 2B+D
• 2 Binary 1 Quaternary (2B1Q)
• 2 cps, 2 Hz
• 2G (2nd Generation)
• 3
• 30
• 30B+D
• 30B+D
• 32
• 34
• 36
• 38