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Functions
2.9.13
Polarity assignment - V.24 Signals
The 500FSD20 modem permits the free assignment of the V.24 signal definition for frequency
keying. This can be set individually for each signal. In addition, the zero position of the receiver can
be set.
Commands to change polarity assignment
< s e t i n t e r f a c e f s k 0 [ n o ] i n v e r t { c t s | d c d | r t s | r x d |
t x d } >
< s e t i n t e r f a c e f s k 0 r x z e r o { 0 | 1 } >
According to the CCITT, the following assignment applies:
• Data signals (RxD, TxD)
– F+ΔF=SPACE=0 =+12 V
– F-ΔF = MARK = 1 = -12 V
• Control signals (RTS, CTS, DCD, DSR)
– ON = 1 =+12 V
– OFF = 0 = -12 V
If an external DCE opposite side or DTE does not adhere to this assignment, an adjustment can be
made by inverting the signals in an appropriate manner.
Data table
Data format
Traffic mode
Modulation type
CCITT channel
Bit rate nominal
Minimum channel distance
Mid-frequency
Frequency deviation
Number of channels according to
CCITT
Transmitter level according to CCITT
Transmitter level depending on used
channels
[used channels: level / used channels:
level]
Receiver sensivity (RS)
Minimum receiving
level at 14 dB RS
Channel transfer time
Table 18:
Technical data for the channels
1KGT151043 V001 1
serial, binary, asynchronous
Point-to-point, multidrop
Frequency shift keying (FSK) with carrier
switch-off for multidrop networks
R.35 R.37 R.38A 600 bd V.23
50
100 200
120 240 480
lowest
420 480 600
highest
3180 3120 3000
± 30 ± 60 ± 120 ± 210
24
12
-22.5 -19.5 -16.5
1: -6/ 2: -9/ 3: -12/ 4: -12/ 5: -13.8/ 6: -13,8/ 7...
9: -15.6/ 10...13: -17.2/ 14...18: -18.6/ 19...24:
-19.8
0/ 6 / 10 / 14 / 26
high selectiv-
-50
-48
ity
norm. selec-
-53
-53
tivity
high selectiv-
43
26
ity
2400 bd
600
1200 2400
1440
1320
1700 2000
2760
1700 2000
± 400 ± 400
6
2
1
1
-12.0
-8.7
-6.0
-46
-51
-55
-46
-52
-51
-55
-46
15
6,7
3,5
3,1
Settings
Dimen-
sion
bd
Hz
Hz
Hz
Hz
dBm
dBm
dB
dBm
dBm
msec
29
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