11.Proposed revisions to Recommendation M.1370

SETTING-UP AND LINING-UP OF INTERNATIONAL DATA TRANSMISSION SYSTEMS 
           OPERATING IN THE RANGE 48 kbit/s TO 64 kbit/s

       Insert a new  2.5 as follows:

"2.5   Designations of data transmission  systems  can  be  found  in
Recommendation M.140:

       -    for use between administrations: in section 11;

       -    for use as digital leased circuits: in section 3.2.15.

       When a data transmission system is given its designation, and  also  the
related   information   also   has   to    be    established    according    to
Recommendation M.140, section 12. The various items are show in an annex to this Recommendation."

       Replace the text after the first three sentences of section  4.3.2  with
the following (i.e. after "convenient" ...):

       "... Where the international section includes a satellite link,  then  it
       may   be   possible   to   perform    long    RF    loop    measurements,
       including  the  satellite,  if   such   measurements   are   allowed   by
       the   satellite   transponder   configuration,   i.e.,   if   the   earth
       station  can   monitor   its   own   transmission.   Such   measurements,
       made  in  loop  from   the   customer   premises,   the   TIC   or   from
       the   earth   station,   should   be   kept   for   reference   purposes.
       Loop   measurements   must   be   additional   to   the    unidirectional
       measurements  and  should   not   be   substituted   for,   or   compared
       directly with, the end-to-end measurements."
       
       Replace the whole of section 4.3.7 with the following:

       "It may be necessary to switch in the FEC to meet  the  international
section and the end-to-end limits specified in Tables 1/M.1370 to  4/M.1370,
but during initial line-up it is desirable  to  obtain  a  measure  of  data
transmission performance with the FEC facility switched both in and out. However, 
due to modem design, it may not always be possible to obtain measurements with 
the FEC disabled. In other cases it may be necessary to artificially degrade 
the link to obtain a measure of the difference in link performance with  FEC
switched in and out. Measurements and measurement methods, should be retained 
as benchmarks  for  subsequent  comparisons  with  results  obtained  during
maintenance."

       Add the following new annex to the Recommendation:

                                   "ANNEX
                                      
                         (to Recommendation M.1370)
                                      
     DESIGNATION INFORMATION ON INTERNATIONAL DATA TRANSMISSION SYSTEMS


Designation:

       The designation is according to Recommendation M.140, section 11, for  use between administrations) or section 3.2.15 (for private use).

Related information: 

       RI/1        Urgency for restoration;












       RI/2      Terminal countries;

       RI/3      Carriers' name

       RI/4      Control and sub-control station(s);

       RI/5      Fault report points;

       RI/6      Routing;

       RI/7      Association;

       RI/8      Equipment information;

       RI/9      Use;

       RI/10     Transmission medium information;

       RI/11     Composition of transmission;

       RI/12     (Empty item, use: "  ;");

       RI/13     Occupancy.

       The various items will be dealt  with  in  section  12  of
Recommendation M.140: 

       "RELATED INFORMATION FOR INTERNATIONAL DIGITAL BLOCKS, PATHS AND DATA 
       TRANSMISSION SYSTEMS"