Ericsson EDACS LBI-39077 - Manual (Page 36)

LBI-39077 DATA LINK TO GTI UNITS
36
REMOTE DATA LINK WITH INTERNAL GTI MODEM
If the distance between the GTI unit and GTI Configurator is longer than 50 feet, modems will be needed on each end of a
telephone circuit between them. The simplest method is to utilize the 1200 bps modem built into the GTI unit. This will
require the following additional equipment:
•
1200-baud, Hayes-compatible modem at GTI Configurator location (internal or external to the GTI Configurator -
cable also required if an external modem is used)
•
Available telephone line at GTI Configurator location and a cable to connect from the telephone line to the modem
Note that when the GTI Configurator is communicating with the GTI unit in the system, one less line will be available for
interconnect calls (because it is in use by the GTI Configurator). If this is a problem, you may want to consider using an
external modem at the system connected to the RS-232 port of a GTI unit. This will require an additional telephone line to the
system, but will not reduce the number of lines available for interconnect calls. See the REMOTE RS-232 LINK WITH
EXTERNAL GTI MODEM heading later in this section for more information.
Normal Setup
To set up a remote RS-232 link with the internal GTI modem, use the following procedure:
GTI Unit GTI Configurator
Serial COM Port
Telco Port
Modem
Telephone
Hayes
(or equiv.)
Exchange
LINE
or
TELCO
Serial
COM Port
Figure 28 - Communication Setup for Remote Data Link with Internal GTI Modem
1. Connect the cables and equipment as shown in Figure 28. Most computer stores carry the necessary modem cables,
but pay particular attention to the gender of the connectors. Most modems have a female DB-25 connector, so the
cable probably will have a male DB-25 connector on the modem end. Most PC Serial COM ports have a male DB-
25 connector (but some have a male DB-9 connector), so the cable may have a female DB-25 or DB-9 connector on
the PC end. Make sure you connect to a serial port on your PC, not a parallel port. Most PC's have a female DB-25
connector for the parallel port.
Connect the line between the telephone exchange and the modem to the connector labeled LINE or TELCO (not the
connector labeled PHONE or LOCAL). Do not bypass the telephone exchange by connecting directly from the LINE
or TELCO connector on the modem to the TELCO Port on the GTI unit. The modems are designed to interface with
a telephone exchange, not with each other.
2. Set up the modem (at the GTI Configurator end) for the telephone line type to be connected to it. See the modem
manufacturer’s manual for directions.
3. Using the GTI Configurator, select (highlight) the System config operation from the Edit group in the Main Menu
screen, and press the Enter key to display the System Configuration screen. In the INDEX window, select (highlight)
the system for which you are setting up communications, and press the Enter key to move to the SYSTEM CONFIG
window for that system. Select (highlight) the System Access field, type "I" (for internal modem), and press the
Enter key to display the INT_MODEM pop-up window (just below the System Access field). The INT_MODEM
pop-up window contains a Phone # field and a Baud Rate field. Type the telephone number (of the line connected to
the GTI unit for which you are setting up communications) into the Phone # field, and press the Enter key to move
on to the Baud Rate field. If the number shown in the Baud Rate field is 1200, press the Down Arrow key. If the