Nortel Networks Circuit Card 311 - Manual (Page 429)

Operating modes 429
Service changeable downloadable parameters (LD 11)
Operation
mode
Modem/
Gateway/
Host/KBD
Forced
DTR*
Hotline
Type of device
to be connected
Group selection
DEM PRM DTR HOT
13 (DCE) ON
"KBD On"
(prompts on) OFF
Not
Forced On
Hotline Terminal similar to
ASIM when set to
Not Forced DTR
and Hotline
14 (DCE) ON
"KBD On"
(prompts on) ON
Forced OFF
Not
Hotline Terminal similar
to ASIM when set
to forced DTR and
Not Hotline Modes 12, 13,
14, and 15 are for
RS232 Terminal
connectivity
(similar to ASIM)
15 (DCE) ON
"KBD On"
(prompts on) ON Forced On Hotline Continuous
Hotline when DTR
is ON
* Not prompted for Type = R422. Defaults for Type = R422: DEM = DCE and DTR = OFF.
Selecting the proper mode for Modem connectivity
Select modes 0, 1, 2, and 3 when the DAC is connected to different types of
modems for inbound and outbound modem pooling. In these modes, the
DAC operates as a DTE, monitors the DSR, DCD, and RI control leads, and
drives the DTR lead. No menus are given and no characters are echoed
when DCD is OFF. All prompts and messages are enabled for inbound
calls and disabled for outbound calls.
In modes 0 and 1, the DAC drives the DTR lead OFF when in the idle state,
and ON when processing an incoming or outgoing call.
In modes 2 and 3, 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.
In the case of outbound modem pooling, the DAC answers the data call and
drives the DTR lead ON (modes 0 and 1). Then the calling data module and
the DAC form a transparent link between the calling DTE and the modem.
The DTE user may then enter the appropriate commands to the modem for
dialing a remote modem. When the call is established, the modem may
cause the DAC to disconnect the call by dropping either DSR or DCD.
In the case of inbound modem pooling, the modem must drive the RI lead
ON to activate the DAC. Then the DAC responds by driving the DTR lead
ON and making the unit busy for outbound calls (modes 0 and 1). The
modem is expected to turn DCD to ON within 35 seconds; otherwise,
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.