Nortel Networks Circuit Card 311 User 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