Recommendation R.101 1. Add the following note to Table 4/R.101 (The existing note becomes "Note 1"): "Note 2 - The allocation of 50-baud channel 16 for maintenance purpose cancels the possibility to set up 100-baud channel 16 and 200-baud channel 04." 2. Add the following note to Table 5/R.101 (The existing note becomes "Note 1"): "Note 2 - The allocation of 50-baud channel 24 for maintenance purpose cancels the possibility to set up 75-baud channel 24 and 150-baud channel 08." 3. Replace the word "numbering" for "allocation" in the headings of Tables 3/R.101, 4/R.101 and 5/R.101. 4. Add the following to point 11.1: "The implementation of this optional measurement should be such that the error rate on the synchronizing bits is supervised continuously and an alarm is issued when a preselected limit has been reached. The alarm limits should be at least one faulty bit every 103, 104 or 105 bits.".