The CN Tower-A history of firsts / La Tour CN-Les grandes premieres-PremiÃ¨res: duration 111. seconds
CDA Technical Institute (CDA), formerly Commercial Diving Academy, is a federally accredited school. The second factor for a prospective student to consider is the additional accreditations the school offers. The Association of Commercial Diving Educators (ACDE) offers both an accreditation and a certification.
Continuous Digital Coded Squelch System (CDCSS), Digital Private Lineâ¢ (DPLâ¢), Digital Channel Guardâ¢ (DCGâ¢), etc. The Continuous Digital Coded Squelch System (CDCSS), was the follow-on to CTCSS (but some books use Code instead of Coded in the name). Instead of a constant low frequency tone, CDCSS superimposes a continuous repeating data or code stream of 23-bit square wave digital data words on the transmitted signal at a bit rate of 134.4 bits per second (with a tolerance of + or - 0.4 bps).