Nortel Networks Circuit Card User Manual

Page 436

NT7D16 Data Access card

553-3001-211 Standard 3.00 August 2005

The fourth mode, gateway, is a subset of the modem mode and is not normally
used. This mode is useful if the attached modems do not have Ring Indicator
lead. The application used is inbound modem pooling.

The different modes enable the DAC to connect to different types of devices
such as modems (modes 0, 1, 2, and 3), gateways (modes 4, 5. 6, and 7), hosts
(modes 8. 9. 10, and 11), and terminals (modes 12. 13. 14, and 15). After
selecting the appropriate group (that is, modem, gateway, host, or terminal),
the installer should study the four different modes in that group to make the
proper selection. See Table 157.

Table 157
DAC mode of operation selection (Part 1 of 5)

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

0 (DTE)

OFF
“Host On”
(Ring
Indicator
— RI)

OFF
Not
Forced

OFF
Not
Hotline

Modem Pool
inbound and
outbound (similar
to Synchronous /
Asynchronous
Data Module
(SADM) in
inbound) MSB by
RI

Modes 0, 1, 2,
and 3 are for
RS232 modem
connectivity

1 (DTE)

OFF
“Host On”
(RI)

OFF
Not
Forced

ON
Hotline

Modem Pool
inbound only
(Hotline by RI-
similar to SADM)

* Not prompted for Type = R422. Defaults for Type = R422: DEM = DCE and DTR = OFF.