ELF (Extremely Low Frequency)

ELF radio has a frequency of 30–300 Hz and a wavelength of

10,000–1,000 km. ELF radio has application in submarine radio communications. See also electromagnetic spectrum, frequency, Hz, and wavelength.

• 8-VSB (8-level vestigial sideband)
• 9
• 900
• 900 Service
• 911
• AAL1 (ATM Adaptation Layer Type 1)
• AAL2 (ATM Adaptation Layer Type 2)
• AAL3/4 (ATM Adaptation Layer Type 3/4)
• AAL5 (ATM Adaptation Layer Type 5)
• AAL (ATM Adaptation Layer)
• A (Ampere)
• AAV (Alternative Access Vendor)
• abbreviation
• Abilene Project
• Abilene Project
• ABM (Asynchronous Balanced Mode)
• Above 890 Decision
• ABR (Available Bit Rate)
• absorption
• abstruse
• AC-3 (Adaptive Transform Coder 3)
• AC-3 (Adaptive Transform Coder 3)
• AC (Alternating Current)
• A Carrier
• acceptance angle