Altec ISDN Socket Modem AL5068S-3V - Manual (Page 12)

AL5068S Designer’s Guide
No. AL5068S-E00-105 Altec Electronic AG Seite 12 / 25
Table 3.2 / Signal Descriptions
Label
I/O
Type
Signal Name Description
VCC PWR +5 VDC / 3.3 VDC
GND GND Ground. Connect to Digital Ground on the interface circuit.
~RESET IC
Modem Reset. The Active Low ~RESET input resets the Socket Modems
logic and returns the AT command set to the original factory default
values and to “stored values” in NVRAM. ~RESET is connected to a built-
in reset circuit on the Socket Modem. This input is 5V tolerant.
TX+ S
0
Bus Transmit Positive from ISDN S
0
Bus.
TX - S
0
Bus Transmit Negative from ISDN S
0
Bus.
RX + S
0
Bus Receive Positive from ISDN S
0
Bus.
RX - S
0
Bus Receive Negative from ISDN S
0
Bus.
Table 3.3 / LED Interface Signal Descriptions
Label I/O Type Signal Name/Description
LED driver lines are open-drain inverter-driven (74HCT05) lines with 1.5 KΩ, 1/10W pull-up resistors.
DCDIND OG Active High DCD Status
RXDIND OG Active High RXD Status
DTRIND OG Active High DTR Status
TXDIND OG Active High TXD Status