1)Replace Figure 1/R.115 by the following:

FIGURE 1/R.115 A RECUPERER




















2)     Replace existing paragraphs 3.5 and 3.6 by the following:

"3.5   Loop f - tributary analogue loop

       This loop is a one-way loop (see Figure 2/R.115). With this  loop,  the
tributary signal to be sent to the subscriber is looped back towards the multiplex 
system.  This loop shall be accomplished at the subscriber line interface  and
shall include as many parts of the tributary interface unit as possible.  As long 
as the loop is set the subscriber connection is interrupted.

3.6    Loop g - tributary digital loop towards the MULDEX

       This loop is a one-way loop (see Figure 2/R.115) with the output polarity 
towards the tributary interface unit strappable to A or Z polarity.  Through this 
loop the channel data as received from the aggregate is looped back to the aggre- 
gate towards the distant TDM equipment.  This loop shall be accomplished as close 
as possible to the internal tributary interface which can be  located  on  the
tributary interface unit or in the TDM central logic.

3.7    Loop h - tributary digital loop towards the tributary interface unit

       This loop is a one-way loop with the output polarity towards the MULDEX- 
part of the given channel strappable to A or Z polarity.  Through this loop the 
channel data at the tributary input is looped back to the channel output through 
the tributary interface unit. This loop shall be accomplished as close as possible 
to the TDM central logic."

3.     Modify  5.3 as follows:

5.3    The control of loops a, b, c and d should be supervised by  a  time-out
function. The time-out function shall automatically  open  the  loop  after  a
specified time period, measured from the closing of the loop. The length of the 
time period should be chosen from time intervals 5, 20 or 40 seconds by bilateral 
agreement between administrations.

       The operation and test procedure for loop f to h is a national matter.












4.     Modify  6.2 as follows:

6.2    Alternative B

       When maintenance facilities do not  use  control  signal  according  to
Recommendation U.12, the signalling characters on the maintenance channel selected 
must conform to International Alphabet No.5 (IA5), with an even  parity  check
(Figure 6/R.115).













                                FIGURE 6/R.115

                          Control signalling format