1405-5546 1405-5546 S1405-55462019000200461 10.13053/cys-23-2-2977 Mexico Mexico Mexico 00 06 2019 00 06 2019 23 2 461 467

1 2013 101 5 5 1234-52 2 2013 5 1 1 36-9 3 2016 1-12 4 2006 261-2264 5 2017 15 4 4 72-5 6 TU-T 2016 7 2016 8 Itu-BS.1534 2015 1-34 9 1950 22 5 5 675 10 ITU-T 1996 800 11 ITU-T 2001 12 2002 50 10 10 765-78 13 2005 2725-8 14 1996 18 4 4 381-92