Busy Signal

• For busy signals in the context of telecommunication and telephony, see Busy signal (telephony).
• For analogues to busy signals applicable in the context of the protocol HTTP, see Busy-signal equivalent (HTTP).

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bit robbing bit sequence independence bit slip bit stream transmission bit stuffing bit synchronous operation black facsimile transmission black noise black recording blind transmission block	block check character blocking block transfer attempt bonding branch brewster's angle bridge to bridge station bridging loss brightness b6zs b3zs	buffer burst switching burst transmission busy hour busy verification bypass cable television relay service station call call collision call delay call duration	called party camp on calling party camp on call management call processing call second call set up time call sign allocation plan call tracing camp on busy signal cancel character capacitive coupling