54200
Users Manual
7-16
Digital Services
Wide Screen Signalling (WSS)
Reference ETSI, ETS 300 294, November 1994
PALplus System Description, Revision 3.0, January 1994
Rec. ITU-R BT.1119
TV systems 625 line systems
Data line 23 (field 1)
Signalling method Bi-phase coding, NRZ-L
Clock frequency 5 MHz
Tolerance 3 ppm for +5 to +45
°
C
1 ppm at reference temperature
Aging
≤
2 ppm per year
Level 0.5 V for ‘1’ at 0.7 V maximum video level
Black level for ‘0’
Tolerance 5% for ‘1’
3% of sync amplitude for ’0’
Teletext DIDON ANTIOPE (CCIR System A
)
Reference CCIR Rec. 653-1
CCIR Doc. 11/345-E
TV systems 625 line systems
Data line 20, 21, 333, 334
Signalling method Binary NRZ
Clock frequency 6.203125 MHz
Tolerance 3 ppm for +5 to +45
°
C
1 ppm at reference temperature
Aging
≤
2 ppm per year
Level 7/3 of sync amplitude for ‘1’
Black level for ‘0’
Tolerance 0 to -10% for ‘1’
3% of sync amplitude for ’0’