Nortel Networks 553-3001-211 manual DAC to Host connectivity

Page 442 of 894 NT7D16 Data Access card

go ON for 2 seconds and then OFF for 4 seconds until the call is answered by the host. When the host turns DTR ON, the DAC answers the call. If DM-to-DM protocol exchange is successful, the DAC drives CTS, DSR, and DCD ON. If DTR was already ON, the DAC does not drive RI ON.

Figure 90

DAC to Host connectivity

Host (DTE)

pin 2 pin 3 pin 5 pin 6 pin 7 pin 8 pin 20 pin 22

RS- 232 leads

>>>

<<<

<<<

<<<

<<<

>>>

<<<

DAC (DCE)

TX

RX

CTS

DSR

GND

DCD

DTR

RI

not required for mode 10

553-5219

Mode 8

This mode should be selected when the DAC is connected to a host for host accessing. In this mode, the DAC operates in a similar manner to the MCDS. The hosts used with this mode should have the following characteristics:

Auto-answer capability The host should be capable of monitoring the RI lead for detection of incoming calls. When RI is turned ON by the DAC, the host responds by driving DTR ON, which forces the DAC to answer the incoming call. If the host drives the DTR lead ON all the time, incoming calls will always be immediately answered and the RI lead will not be turned ON by the DAC. If DM-to-DM protocol exchange is successful, the DAC drives CTS, DSR, and DCD ON.

553-3001-211 Standard 2.00 September 2004