Labels:text | black and white OCR: CALL ESTABLISHMENT called and which Is the calling modem. Data transmission is turned OFF. This results in a steady MARK on the RECEIVED Half Duplex Before two modems can exchange data, an electrical connection initialed by asserting REQUEST TO SEND (ATS), At this time the DATA (RD) line of the remote modem, As discussed in the data transmission section above, when a through the phone system must be established. Although it may TRANSMITTED DATA (TO) input will be released and a mod- Squelch. The local receiver must be turned OFF after RTS is half duplex mode has been selected, the signal ATS controls assist in call establishment, a modem typically does not play a ulated carrier can appear at the TRANSMITTED CARRIER (TC) major role. A call may be originated manually or automatically and oul ...
