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1992
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1991-12-31
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46 lines
Recommendation S.20
1) Replace 4 d) by the following:
"d) At any time, automatic transmission may be stopped by either the
detection of incoming teleprinter signals or the forced clearing of
the call. In the latter case an alarm should be given and then the
call should be re-established by the operator. However, if the
connection is still established but the automatic transmission has
stopped, an alarm should be given to the operator. If the alarm is
cleared by the operator within 30 seconds, proceed to step n) else
step m). Automatic transmission may be resumed after a delay of
1 second. If the transmission includes a TDM system with loop back
facilities, (refer Recommendation R.101 3.6.2b), this condition may
continue for a period of 5 to 7 seconds."
2) Add new point 4 n):
"n) Having waited for a period of at least 7 seconds from the
commencement of the alarm, the operator should send carriage return,
line feed then a WRU signal. (This delay is necessary to allow TDM
systems with loop back to restore to normal or choose an alternative
bearer, refer R.101 3.6.2b). If the called party's answer back is
correctly received, the tape should be reset after giving a further
carriage return and line feed.
Automatic transmission can again be started."
3) Add new point 5):
"5. Clearing of a broadcast call shall be in accordance with
Recommendation U.44."