Nortel Networks Circuit Card 311 - Manual (Page 435)

Operating modes 435
• The equipment does not drive RI lead (optional, the DAC ignores this
lead).
• The equipment must drive DCD lead dynamically.
• The equipment drives DSR lead (optional).
• The equipment can monitor the DTR lead (optional, depending on the
mode selected).
In modes 4, 5, 6, and 7, the DAC:
• operates as a DTE
• monitors the DSR
• monitors DCD control leads
• drives the DTR lead
The RI lead is ignored. No menus or prompts are given when DCD is OFF.
All prompts and messages are enabled for inbound calls and disabled
for outbound calls. See
Figure 110 "DAC to Gateway connectivity" (page
436) for more details.
In modes 4 and 5, the DAC drives the DTR lead OFF in the idle state, and
ON when processing an incoming or outgoing call.
In modes 6 and 7, the DAC drives the DTR lead ON except when the call is
being disconnected. At disconnect, DTR is dropped for 0.2 seconds and
then returns to ON.
With outbound gateway access, the DAC answers the data call and drives
the DTR lead ON (modes 4 and 5; in modes 6 and 7, DTR is already ON).
Then the calling data module and the DAC form a transparent link between
the calling Data Module (DM) and the gateway. The DM user may then enter
the appropriate commands to the gateway to establish a data call. The
DAC expects the gateway to drive DCD ON (modes 4 and 5 only) within 35
seconds. If the gateway fails to do so, the DAC turns DTR OFF and drops
the call. When the call is established, the gateway may cause the DAC to
disconnect the call by dropping either DSR or DCD.
For inbound gateway access, the gateway must drive the DCD lead ON to
activate the DAC. When the DAC receives this signal, it drives the DTR lead
ON, makes the unit busy for outbound calls (modes 4 and 5; in modes 6 and
7, DTR is already ON), and prepares to accept <CR> for autobaud. The
DAC expects DCD to remain ON for as long as the data call is established.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.