Altec Analog Socket Modem AL2094S - Manual (Page 14)

AL2094S Designers Guide
Doc. No. DG_2094E Altec Electronic AG Seite 14 / 30
• Calling tone is generated in accordance with V.25. Calling tone may be toggled
(enabled/disabled) by inclusion of a “^” character in a dial string. It may also be
disabled.
• Frequency and cadence of tones for busy, ringback, congested, warble, dial tone 1, and
dial tone 2.
• Answer tone detection period.
• Blacklist parameters. The modem can operate in accordance with requirements of
individual countries to prevent misuse of the network by limiting repeated calls to the
same number when previous call attempts have failed. Call failure can be detected for
reasons such as no dial tone, number busy, no answer, no ringback detected, voice
(rather than modem) detected, and key abort (dial attempt aborted by user). Actions
resulting from such failures can include specification of minimum inter-call delay,
extended delay between calls, and maximum numbers of retries before the number is
permanently forbidden ("blacklisted").
2.10 Diagnostics
Commanded Tests
Diagnostics are performed in response to &T commands.
Analog Loopback (&T1 Command). Data from the local DTE is sent to the modem, which
loops the data back to the local DTE.
2.11 Low Power Sleep Mode
Sleep Mode Entry. The modem enters the low power sleep mode when no line connection
exists and no host activity occurs for the period of time specified in the S24 register. All
modem circuits are turned off except the internal clock circuitry in order to consume reduced
power while being able to immediately wake up and resume normal operation.
Wake-up. Wake-up occurs when a ring is detected on the telephone line or the DTE sends a
character to the modem.