DSP DSP 9612, User Manual

Page: 22 / 41

Connecting to a Transmission Line
Page 23
In switched-carrier mode (SW2-8 set to OFF), the RTS/CTS delay is
23 ms.
SW 2-9
−
RX Termination (high- & low-speed modes)
SW2-9 ON = Disable Rx Termination
OFF = Enable Rx termination
SW2-9 selects whether RX termination is enabled for a modem. If you
set this switch OFF, the receiver is terminated with 600
Ω
. If you set
this switch ON, the receiver is not terminated.
Connecting to a Transmission Line
The modem has a transmission line interface that can be configured for
2- or 4-wire, analog connection, where one pair is used to transmit data
(Tx and Tx) and one pair is used to receive data (Rx and Rx). Table 2-6
shows the pin numbers and corresponding signals for the modem.
Figure 2-3 shows the transmission line interface.
Note: For communication to occur, the Rx line of one modem
must connect to the Tx line of the other modem. The
modem’s Tx/Rx pair are non-polarized.
Note: The modem does not support leased-line operations with DC
current.