Here is the extract from the BBB of C rules manual avaliable to all at:
http://www.bbbofc.com/documentation.php
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3.32 Should a Boxer go down to the floor as the result of a legitimate blow, the Timekeeper
shall count off the seconds strictly in accordance with his watch. The opponent shall
retire immediately to the furthest neutral corner and neither Boxer shall resume boxing
until ordered to do so by the Referee.
3.32.1 In this Regulation 3.32, “down” shall mean one or more of the following:-
(a) when a Boxer falls from the boxing ring beyond the ring apron as a result of a
legitimate blow; or
(b) when a Boxer is on one foot or both feet and at the same time any other part of
his body is touching the floor of the boxing ring; or
(c) when a Boxer is supported on the ropes of the boxing ring and, in the opinion of
the Referee, is unable to defend himself; or
(d) when a Boxer is in the act of rising
and in all of the above cases, a Boxer shall be considered to be down until he has
regained his feet within the boxing ring and is in a position and a condition to defend
himself.
3.33 If a Boxer is “down” under the provisions of Regulation 3.32.1(a) he must return to
the boxing ring unassisted within twenty seconds. In all other cases mentioned above,
he must regain his feet unassisted within ten seconds. The Referee shall not permit a
Boxer to continue boxing, if in his opinion he is able to do so, until the expiration of 8
seconds following the knock down.
3.33.1 A Boxer failing to continue with a Contest after the intervals specified above shall not
be awarded any points for that round but will have 10 points deducted from his score.
His opponent shall receive ten points and be declared the winner.
3.33.2 If a Boxer regains his feet in the boxing ring within the specified intervals but fails to
satisfy the Referee that he is in a position and condition to defend himself, the Referee
shall stop the Contest and deduct ten points from this score. He shall award the
opponent ten points and declare him the winner.
3.33.3 A Referee shall have the power to interrupt the count where he considers that a fallen
Boxer is in need of urgent medical attention and in such cases the opponent shall be
declared the winner by a technical count out (T.C.O.).
3.33.4 A Referee may consult the ringside doctor at any stage concerning the fitness of a
boxer to continue a Contest.
3.34 If at any time during a Contest the Referee decides in his complete discretion that one
contestant is outclassed or is unable to continue as a result of injury, or is not in a
position to continue boxing or, at the conclusion of any round, is ten points or more
behind his opponent, he shall stop the Contest and declare the opponent the winner.