Nortel Circuit Card Installation Manual page 458

Page 458 of 906
Figure 94
DAC to Terminal connectivity
Terminal (DTE)
RS- 232 leads
553-3001-211 Standard 3.00
NT7D16 Data Access card
pin 2
pin 3
pin 5
pin 6
pin 7
pin 8
pin 20
pin 22
unless the DTR lead is driven ON by the terminal. Any terminal that drives
the DTR lead ON can be used with this mode (such as VT100 or VT102).
The DAC drives CTS, DSR, and DCD ON, except when a call is dropped or
when control—Z is entered during the idle state. In this case, the DAC drives
those leads OFF for 0.2 seconds and then ON. When the DTR lead is driven
OFF by the terminal, the DAC does not execute autobaud, nor will it respond
to any command.
Note: If the PBDO parameter in LD 11 is ON, then Make Set Busy will
be activated when DTR is driven OFF for more than five seconds.
Programing DAC for mode 12 in service change LD 11
The DAC must be configured as R232 or R422 since Autodial, Speed Call,
and Display commands are likely to be used.
August 2005
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DAC (DCE)
TX
RX
CTS
DSR
GND
DCD
DTR
RI
not required
for mode 14
553-5220