Tutorial – CTI Products NCB/IM with Internal PSTN Modem User Manual
Page 16
CTI Products, Inc.
NCB/IM User Guide
2. Setup and Operation
10
Setting the Internal Modem Configuration (Switches 1, 2, 7, and 8)
Will a Dial-Up line be
used for this Network?
If Manual or Perpetual
Dial-up
Mode
is
required, see “D
IAL
-U
P
C
IRCUITS
” following in
this section.
If
using
a
leased
telephone
line,
see
“L
EASED
-L
INE
C
IRCUITS
” following in
this section.
Dial-Up Circuits (OPTION A Switch 2, UP)
1) OPTION A Switch 2 must be in the UP position for dial-up operation (Manual or Perpetual
mode). In dial-up mode, switches 7 and 8 are ignored.
2) For an NCB to be capable of both originating and answering a call, Auto-Answer must be
enabled (OPTION A Switch 1, UP). To only originate calls, Auto-Answer should be disabled
(OPTION A, Switch 1, DOWN).
Note: with OPTION A Switch 5 DOWN (see below), OPTION A Switch 1 is ignored. In this
case, Auto-Answer mode is enabled/disabled by Network Variables or the NCB/Plug plug-in.
Leased-Line Circuits (OPTION A Switch 2, DOWN)
1) When using Leased-Line circuits, one NCB must be in ‘Leased-Line: Originate’ mode, and
the other NCB must be in ‘Leased-Line: Answer’ mode. (It does not matter which NCB
module is in which mode).
Note: With OPTION A Switch 2 DOWN (to enable Leased-Line modem mode), the Auto-
Answer enable/disable setting using Network Variables or the NCB/Plug plug-in is ignored.
Which Modem Mode should be used?
Leased-Line Mode
This is the simplest mode as long as a permanently connected
(non-switched) leased telephone line is available. After power-
up or reset, an NCB in ‘Leased-Line: Originate’ mode will
immediately attempt to connect with an NCB in ‘Leased-
Line:Answer’ mode on the line. If the connection is lost, the
process repeats.
Manual Dial-Up Mode
This mode uses a switched telephone line and requires
command information be sent to the NCB that will initiate a
dial sequence. This command information is sent in the form
of Network Variables or Explicit Messages. After receipt of a
dialing command, the NCB will attempt to connect with the
NCB connected to the specified phone number. When the
NCB being dialed detects an incoming ring, a connection will
be established. Command information must also be sent to
disconnect after transmission of all messages is complete.
Perpetual Dial-Up Mode
This mode simulates the constant connection of a Leased-Line,
but uses a switched Dial-Up line. The NCB initiating a call
must have the phone number of another NCB stored internally.
This can be accomplished with the NCB/Plug plug-in or the
DOS NCBCON program. The connection will be attempted
whenever the link does not exist.
See “A
” for more details.
Tutorial . . .
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