Calling Line Identifier with VMWI
CMX612
Notes
Min.
Typ.
Max.
Units
FSK Receiver
Transmission rate
1188
1280
2068
1188
2178
-40.0
1200
1300
2100
1200
2200
1212
1320
2132
1212
2222
-8.0
Baud
Hz
Hz
Hz
Hz
V23 Mark (logical 1) frequency
V23 Space (logical 0) frequency
Bell202 Mark (logical 1) frequency
Bell202 Space (logical 0) frequency
Valid input level range
4
dBV
Acceptable twist (mark level wrt space level)
V23
-6.0
-10.0
+6.0
+10.0
dB
dB
Bell202
Acceptable Signal to Noise ratio
V23
5
5
4
20.0
30.0
dB
dB
dBV
ms
ms
Bell202
Level Detector ‘on’ threshold level
Level Detector ‘off’ to ‘on’ time (Fig 4 Teon)
Level Detector ‘on’ to ‘off’ time (Fig 4 Teoff)
-40.0
25.0
8.0
Input Signal Amplifier
Input impedance
Voltage gain
7
10.0
MW
V/V
500
XTAL Input
‘High’ pulse width
‘Low’ pulse width
8
8
100
100
ns
ns
Dial Tone Detector
‘Low’ tone nominal frequency
‘High’ tone nominal frequency
Start of Dial Tone signal to DET high time
(Fig 7 Tdon)
350
440
60.0
Hz
Hz
ms
End of Dial Tone signal to DET and IRQN low
time (Fig 7 Tdoff)
DET high time (100ms tone duration)
3.0
1.3
24.0
40.0
33.0
60.0
ms
ms
3
4
To ensure detection:
‘Low’ tone frequency tolerance
‘High’ tone frequency tolerance
Level (per tone)
±7.0
±7.0
-12.2
Hz
Hz
dBV
-31.2
350Hz tone level wrt
440Hz tone level
Signal to Noise ratio
Dual tone burst duration for DET output
Dual tone burst duration to ensure
IRQN goes low
-6.0
20.0
80.0
+6.0
dB
dB
ms
5
9
9
6
80.0
ms
To ensure non-detection:
‘Low’ tone frequency tolerance
‘High’ tone frequency tolerance
Level (total)
-45.0
-30.0
+30.0
+40.0
-36.0
30.0
Hz
Hz
dBV
ms
4
Dual tone burst duration
ã 2002 Consumer Microcircuits Limited
23
D/612/3
CMLMICRO [ CML MICROCIRCUITS ]
