Nortel-networks Circuit Card Manual de usuario descargar pdf (Pagina 467)

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101

NT7D16 Data Access card Page 467 of 906

Circuit Card Description and Installation

Mode 8 Host access for call

origination and answering

Host answering an incoming data call:

Local DM user dials the access number to initiate

the connection.

DAC responds by driving RI ON for 2 seconds and

OFF for 4 seconds until the Host answers by

turning DTR ON. (If the Host always drives DTR

ON, the DAC immediately answers the call

without driving RI ON.)

When Host receives RI ON, it should respond by

turning DTR ON.

DAC answers when it receives DTR ON.

DAC turns DSR, DCD, and CTS ON when the call

is completely established. The local DM user is

now transparently linked to the Host.

Host originating a data call:

Host turns DTR ON to initiate the connection.

DAC prepares to receive <CR> for autobaud.

Host sends <CR> followed by other commands

for establishing a data call (the DAC does not

echo a command, nor does it send any prompt to

the Host (blind dialing).

When the data call is completely established, the

DAC turns DSR, DCD, and CTS ON as long as

the call is connected.

Table 158

Connect and disconnect protocol (Part 7 of 12)

Mode of

operation

Interface application Comments

1 2 ... 462 463 464 465 466 467 468 469 470 471 472 ... 907 908

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Nortel-networks Circuit Card Manual de usuario Pagina 467

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