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Page 26
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 2-7
shows the pin numbers and corresponding signals for the modem.
Figure 2-4 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.
Table 2-7. Transmission Line Connector Pin Assignments
This Pin Number… Corresponds to This Signal…
1Rx
2Rx
3Tx
4Tx