Page 464 of 906 NT7D16 Data Access card553-3001-211 Standard 3.00 August 2005Mode 3 Inbound Hotline modempools (with forced DTR)Use this mode with Hayes1200 modem.Inbound Hotline modem pooling:The DAC operation is identical to mode 1 exceptthat DTR is always forced ON (except duringdisconnect).Call disconnection:Disconnection is identical to mode 2.Mode 4 Inbound and OutboundGateway accessInbound Gateway connection protocol:Gateway raises DCD to initiate connection.DAC responds by driving DTR ON.Gateway does not have to turn DSR ON.However, toggling DSR or DCD from ON to OFFcauses the DAC to disconnect the call.Gateway user sends to the DAC.DAC autobauds and sends the initial prompt tothe Gateway.Outbound Gateway connection protocol:Local DM user calls the DAC that is connected toa Gateway.DAC answers the data call and drives DTR ON.Gateway receives DTR and prepares to receivecommands.Local DM user is now transparently connected tothe Gateway.Gateway is expected to drive DCD ON within 35seconds. If the Gateway fails to do so, the DACdrops DTR and the call.Table 158Connect and disconnect protocol (Part 4 of 12)Mode ofoperation Interface application Comments
