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Appendix E - Homologation Testing Command
Homologation Automated Test Options
This command is a special test hook that causes the modem to go off-hook and generate a continuous signal. In
order to enable this command you must first type the command ATS46=0. The signal that is specified by the
AT*HO options is sent over the modem line interface as long as AT*HO is set to a non-0 option. This capability is
necessary for measuring the inband and outband noise condition for each signal.
Spectrums
Spectrums are affected by the transmit level and other options.
DTMF
When DTMF is selected, the modem goes off-hook and generates the digit specified as option 2. This is a
continuous DTMF signal (no off time). It is necessary to characterize the inband and outband noise.
The AT*HO command takes between 1 and 4 option parameters.
This command has the format:
AT*HOa,b,c,d
where:
a = a parameter 1 option
b = a parameter 2 option
c = a parameter 3 option
d = a parameter 4 option
Examples:
AT*HO1,15,0,1 represents V.21, -15dB, Answer Band, Space
AT*HO12,4 represents DTMF, digit 4
Parameter 1
Parameter 2
(Tx Level)
Parameter 3
Parameter 4
Option
Description
Option
Description
Option
Description
Option Description
0
Normal
1
V.21
9 to 20
-9 to -20 dB
0
1
Answer Band
Originate Band
0
1
Mark
Space
2
Bell 103
9 to 20
-9 to -20 dB
0
1
Answer Band
Originate Band
0
1
Mark
Space
3
V.23
9 to 20
-9 to -20dB
0
1
2
Forward (1200)
Forward (600)
Backward (75)
0
1
2
Binary 1
Binary 0
Pattern
5
V.22
9 to 20
-9 to -20 dB
0
1
2
3
Orig. Band -1200 bps
Ans. Band - 1200 bps
Orig. Band - 2400 bps
Ans. Band - 2400 bps
0
1
2
No Guard Tone
550 Guard Tone
1800 Guard Tone
6
V.27
9 to 20
-9 to -20 dB
0
1
2400 bps
4800 bps
7
V.29
9 to 20
-9 to -20 dB
0
7200 bps