Toshiba Strata DK24 Installation And Maintenance Manual page 227

INSTALLATION-PERIPHERALS
SECTION 400-096-208
SEPTEMBER 1992
to operate like a DTE device. In the example
installation in Figure 8-28, the line side of the two
modems are connected to PSTU/PESU ports to
establish a modem pool; however, the line side of
modems could be connected directly to a dedicated
CO line. If modems are connected directly to tele-
phone network CO lines, automatic transfer of CO
line voice calls to system modems (data call) will
not function as described in the Data Interface User
Guide. For best operation and utilization of CO
lines and modems, it is recommended to connect
modems to PSTU/PESU standard station ports in
a modem pool configuration. The RS-232 side of
the modem connects to the PDIU-DS with standard
RS-232 cables; the PDIU-DS line side (RJ-11 con-
nector) always connects to its own individual PDKU
port. Use the instructions below to install modems
to PDIU-DSs.
1) Configure the PDIU-DS as a DTE device:
Disassemble the PDIU-DS and place jumper
plugs P1 ~ P9 in the "B-C" position (MODEM).
Reassemble the PDIU-DS and mark "B-C" on
the bottom identification label for future refer-
ence. (Paragraph 12.70 provides PDIU-DS
disassembly/assembly instructions and Fig-
ure 8-35 provides jumper plug information.)
2) Connect the PDIU-DS to the appropriate PDKU
circuit per the applicable wiring diagrams in
Section 400-096-209.
3) Connect the appropriate RS-232 cable be-
tween the modem and the PDIU-DS. Figure
8-32 shows an example of how to connect a
PDIU-DS to a smart modem with an RS-232
cable.
IMPORTANT NOTE!
All ten PDIU-DS EIA leads (signals) should
be connected to the modem. Consult the
modem's documentation for correct RS-
232 pin requirements; the requirements
may vary with each manufacturer.
4) Connect the line side of the modem to a PSTU
or PESU standard telephone circuit or a dedi-
cated CO line. (Consult the modem's docu-
mentation to install it to a CO line.) Section
400-096-209 provides PESU/PSTU station
(port) wiring information.
5) Set the PDIU-DS DIP switch (SW1-1 ~ 4) for
the desired application. Figure 8-36 shows the
DIP switch location and Paragraph 12.30 de-
scribes switch functions. SW1-2 should be
OFF when PDIU-DS is connected to a mo-
dem.
6) Use the programs below to configure the
PDIU-DS to connect to an asynchronous
modem. (See programming Section 400-096-
302 for explanations and record sheets.)
•
Program 20
§
LED 01: Should always be ON for PDIU-
DS ports
§
LED 02: Should be ON for PDIU-DS
ports connected to modems, enabling
the use of AT commands and result codes
when incoming calls are made from out-
side the system to modems connected to
PDIU-DSs.
§
LED 03: Should be set ON for PDIU-DS
ports connected to modems.
§
LED 04: Should always be ON for PDIU-
DS ports.
§
LED 05: Should be ON if the system is
installed behind a PBX/Centrex that uses
access codes to place outgoing trunk
calls.
§
LED 06 (Release 4): Should be ON for
DIUs connected to modems. With this
feature turned on, the DIU will send a
one-second release signal on the DTR to
drop the modem when the data user
presses the DataÍRelease (DRLS)
button on their telephone.
§
LEDs 17 ~ 20: Data security groups can
be used to allow or deny digital tele-
phones equipped with PDIU-DIs access
to the PDIU-DS ports connected to a
modem. PDIU-DI stations can only make
data calls to DIUs in the same data secu-
rity group.
•
Program 21
§
For each PDIU-DS/modem pair, assign
the ports on the PDKU and PSTU (or
PESU) that will be connected to the PDIU-
DS and modem, respectively.
•
Program 22/33
8-56