Nortel Networks Circuit Card 311 - Manual (Page 436)

436 NT7D16 Data Access card
Figure 110
DAC to Gateway connectivity
Mode 4
This mode should be selected when the DAC is connected to a gateway for
inbound and outbound operation. The characteristics of the gateways to
be used with this mode are:
Auto-answer capability This feature is required when the gateway is used
for inbound operation. It allows the gateway to drive the DCD lead ON
when the inbound data call is pending. In addition, the gateway should
auto-answer when the DTR lead is ON.
Dynamic control of DCD This feature must be supported by all gateways
to be connected to the DAC. It allows the gateway to drive the DCD lead
ON when the data call is established, and OFF when the data call is
disconnected.
In the inbound operation, the DAC drives the DTR lead OFF until the
gateway drives the DCD lead ON. Then, the DAC drives DTR ON and makes
that unit busy for any outbound calls. After that, the user of the gateway may
enter the proper commands to establish a local data call to any DM.
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.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
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