AL2094S Designers Guide
Doc. No. DG_2094E
Altec Electronic AG
Seite 10 / 30
2.2.3 Modem Handshaking Protocol
If a tone is not detected within the time specified in the S7 register after the last digit is
dialed, the modem aborts the call attempt.
2.2.4 Call Progress Tone Detection
Ringback, equipment busy, congested tone, warble tone, and progress tones can be
detected in accordance with the applicable standard.
2.2.5 Answer Tone Detection
Answer tone can be detected over the frequency range of 2100 ± 40 Hz in ITU-T modes and
2225 ± 40 Hz in Bell modes.
2.2.6 Ring
Detection
A ring signal can be detected from a TTL-compatible 15.3 Hz to 68 Hz square wave input.
2.2.7 Billing
Protection
When the modem goes off-hook to answer an incoming call, both transmission and reception
of data are prevented for 2 seconds (data modem) or 4 seconds (fax adaptive answer) to
allow transmission of the billing tone signal.
2.2.8 Connection
Speeds
The modem functions as a data modem when the +FCLASS=0 command is active. Line
connection can be selected using the +MS command. The +MS command selects
modulation, enables/disables automode, and selects minimum and maximum line speeds
(Table 2-1).
2.2.9 Automode
Automode detection can be enabled by the +MS command to allow the modem to connect to
a remote modem in accordance with draft PN-3320 for V.34 (Table 2-1).
Table 2-1. +MS Command Automode Connectivity
