CMX615D4 CML Microcircuits, CMX615D4 Datasheet - Page 17

• Manufacturer Part Number: CMX615D4
• Description: Digital Line to POTS Interface
• Manufacturer: CML Microcircuits

Digital Line to POTS Interface
CCITT ‘R2’ Signalling Tones
1.6.2
1999 Consumer Microcircuits Limited
CCITT ‘R1’ Signalling Tones
‘C-BUS Timing
The relationship between bytes loaded onto the C-BUS and the transmission of FSK bytes is shown
diagrammatically in Figures 7a, 7b and 7c.
There are many ways in which the C-BUS can be used to program a device and three suggestions
(one for asynchronous FSK - Figure 7a - and two for synchronous FSK -Figures 7b and 7c) are shown
here, together with typical timings. Please note that the C-BUS timing is not shown to the same scale
as the FSK output (it has been magnified by at least 20 times to make it visible on the same scale).
1100+1300
1100+1500
1300+1500
1100+1700
1300+1700
1500+1700
700+1100
900+1100
700+1300
900+1300
700+1500
900+1500
700+1700
900+1700
Forward mode
700+900
1380+1500
1380+1620
1500+1620
1380+1740
1500+1740
1620+1740
1380+1860
1500+1860
1620+1860
1740+1860
1380+1980
1500+1980
1620+1980
1740+1980
1860+1980
(Hz)
(Hz)
Off
Field 2
(Hex)
$12
$13
$23
$14
$24
$34
$15
$25
$35
$45
$16
$26
$36
$46
$56
Field 3
(Hex)
$AC
$BC
$AD
$BD
$CD
$AB
$8C
$9C
$8D
$9D
$8A
$9A
$8B
$9B
$00
$89
17
Backward mode
1140+1020
1140+900
1020+900
1140+780
1020+780
1140+660
1020+660
1140+540
1020+540
900+780
900+660
780+660
900+540
780+540
660+540
(Hz)
Off
Field 3
(Hex)
$00
$65
$64
$54
$63
$53
$43
$62
$52
$42
$32
$61
$51
$41
$31
$21
CMX615
D/615/4