Nortel Circuit Card Installation Manual page 454

Page 454 of 906
Figure 93
DAC to Host connectivity
Host (DTE)
RS- 232 leads
Mode 8
553-3001-211 Standard 3.00
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.
pin 2
pin 3
pin 5
pin 6
pin 7
pin 8
pin 20
pin 22
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.
August 2005
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DAC (DCE)
TX
RX
CTS
DSR
GND
DCD
DTR
RI
not required
for mode 10
553-5219