Ericsson EDACS LBI-39077 - Manual (Page 38)

LBI-39077 DATA LINK TO GTI UNITS
38
NOTE
If the GTI Configurator fails to make contact with the GTI unit, try the following:
Check the cabling.
Check the COM port selection.
Make sure your modem is powered on.
Verify that the interrupt jumpers for the COM port are set right: IRQ4 for COM1 or IRQ3 for COM2.
See the Audio Level Adjustment, Initial String Change, and Originate Mode Change headings below.
Audio Level Adjustment
The audio levels on the GTI unit must be loud enough to permit the modem to operate. Adjust levels as given in a later
section before attempting to connect to the GTI unit with the internal modem.
Initial Command String Change
The modem on the GTI Configurator side of the telephone exchange requires a certain handshake with the GTI Configurator.
The default handshake parameters in the GTI Configurator have been set for a Hayes or Hayes-compatible modem. If the
modem you are using does not respond to the Hayes "ATZ" and "ATDT" commands, you may have to change the
initialization command string sent by the GTI Configurator to the modem. To change the initialization command string, select
(highlight) the Change PC Modem Parms operation from the Other group in the Main Menu screen, and press the Enter key
to display a new screen. In the STATUS window, type in the new initialization command string, following the on-screen
instructions.
Originate Mode Change
Entering “I” (for internal modem) in step 3 of the above procedure, tells the GTI Configurator that the modem at the GTI
Configurator end will send the originate tones to the modem inside the GTI unit. This is called the Reverse originate mode.
The modem inside the GTI unit may also be accessed in the Normal originate mode, where the GTI unit's internal modem
sends the originate tones. This is useful if your office modem is not capable of communicating with the GTI unit's modem in
Reverse originate mode. To enable this feature, use the following procedure:
1. If the GTI units in the system are connected only to DID lines, it will be necessary for you to first program one item
using the local RS-232 link. You must enter a DID user number that will be reserved for modem access. See the DID
User Information and Database Transfers headings in the Database section of this manual.
2. 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.
3. Select (highlight) the System Access field, type "X" (for external modem, even though you will be using the GTI’s
internal modem), and press the Enter key to display the EXT_MODEM pop-up window (just below the System
Access field). The EXT_MODEM pop-up window contains a Phone # field and a Baud Rate field.
4. If you entered a DID user number that will be reserved for modem access in step 1, type that number into the Phone
# field, and press the Enter key to move on to the Baud Rate field. If you skipped step 1 because you will be using an
End-to-End line to connect to the GTI unit, type in the telephone number of the line connected to the GTI unit
followed by a semicolon and the digits 88888. (This is the overdial access number to instruct the GTI unit to connect
its internal modem.)
5. If the number shown in the Baud Rate field is 1200, press the Down Arrow key. If the number shown in the Baud
Rate field is not 1200, press the Enter key to display a second pop-up window (to the right of the first) giving you a
selection of baud rates. Select (highlight) 1200 and press the Enter key to move on to the PC Comm Port field back
in the SYSTEM CONFIG window. Type in the number of the serial COM port you will use, and press the Enter key.
The System Configuration screen, showing the INT_MODEM pop-up window and the second pop-up window, is
shown in Figure 29.