Nortel Circuit Card Installation Manual page 451

Figure 92
DAC to Gateway—Inbound/Outbound connectivity
System
Outbound
hunting
In the outbound operation, the DAC drives the DTR lead OFF until another
DM calls it for outbound accessing. The DAC answers the data call and drives
the DTR lead ON. The calling DM is then transparently connected to the
gateway. The DAC requires the gateway to drive the DCD lead to ON within
35 seconds after the outbound call is connected. Call disconnection may be
initiated by dropping DCD (or DSR) from ON to OFF.
Programing DAC for mode 4 in service change LD 11
When used for inbound or outbound gateway access, the DAC can be
configured as R232 in LD 11. When used for both inbound and outbound
gateway access, the DAC must be configured as R232. When the DAC is
programmed as station hunting, outbound gateway access should be in the
opposite direction to the hunting for inbound gateway access. See Figure 92
for more details.
Note: If CDR is required, use separate outbound and inbound gateway
access.
DAC
R232 port 0
R232 port 1
R232 port 2
R232 port 3
NT7D16 Data Access card
Gateway 1
Gateway 2
Gateway 3
Gateway 4
Circuit Card
Page 451 of 906
Inbound
hunting
553-AAA1127
Description and Installation