User`s guide

Connecting to a Transmission Line

Page

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.