Altec Analog Socket Modem AL2094S User Manual
Page 15
AL2094S Designers Guide
Doc. No. DG_2094E
Altec Electronic AG
Seite 15 / 30
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3.1 AL2094S Modem Hardware Pins and Signals
3.1.1 Phone Line Interface
The phone-line interface signals are:
• TIP
• RING
3.1.2 Call Progress Speaker Interface
The call progress speaker interface signal is:
• Digital speaker output (DSPKOUT); output
DSPKOUT is a square wave output in Data/Fax mode used for call progress or carrier
monitoring. This output can be optionally connected to a low-cost on-board speaker, e.g.,
a sounducer, or to an analog speaker circuit.
3.1.3 Serial DTE Interface and Indicator Outputs
The supported DTE interface signals are:
• Serial Transmit Data input (TXD#)
• Serial Receive Data output line (RXD#)
• Clear to Send output (CTS#)
• Received Line Signal Detector (DCD#)
• Ring Indicator (RI#)
• Data Terminal Ready control input (DTR#)
• Request to Send control input (RTS#)
Additional clock signals provided for synchronous mode are:
• Receive Data Clock (RXCLK#)
• Transmit Data Clock (TXCLK#)
3.1.4 External Reset Input
The supported reset input interface signals are:
• External Reset Input (EXTRESET#)
3.1.5 AL2094S Modem Pin Assignments and Signal Definitions
AL2094S Modem DIL-40 hardware interface signals are shown by major interface in Figure
3-1, are shown by pin number in Figure 3-2, and are listed by pin number in Table 1-1.
AL20XX Modem hardware interface signals are defined in Table 3-2.
I/O types are defined in Table 3-3.
DC electrical characteristics are listed in Table 3-4.