Recommendation U.11

       1)   Point 2, first paragraph, replace by the following:

       "For bothway working circuits used in the  Intercontinental  transit
network, the following action to minimize the incidence of head-on-collision 
is recommended.

       At opposite ends of a group of bothway trunk circuits,  either  inverse
order testing should be adopted or a close approximation to it by testing  the
route in smaller groups of circuits in a fixed order starting the search from the 
same initial position.

       That calls should be offered in such a way that each circuit is  tested
once only for the minimum period of time necessary to ascertain whether it is free 
or busy, and the switching equipment should not have  facilities  for  delayed
searching."

       2)   Point 11, add the following text:

       "Where modern electronic switching equipment is used at both ends of  a
circuit, the above figures for incoming and outgoing guard delay periods may be 
reduced to 0.5 and 1 second respectively."