2.12.3
Programming With A Video Display Terminal
You can program the digital telephone system using a telephone or a Video Display Terminal
(VDT). You can connect the VDT directly to the DSU, or you can program the system remotely
using the following equipment:
•
VDT or a PC and appropriate software program,
•
Pair of data modems.
The data modems must be: “Hayes-compatible,” capable of 300-, 1200-, 2400-, or 9600-baud
data speeds, and have auto-answer capability. Be sure to verify the auto-answer capability before
purchasing the units. You are assured of best results if you employ modems of the same make
and model at both the installation site and the remote programming site.
The equipment connections for the customer location are shown in Figure.
1. Determine the signal needs of the modem from the user’s manual for it. (The digital
telephone system only requires TD, RD, and SG but the modems may require more signals.
Check with the modem manufacturer for special requirements).
2. Wire the proper connector (to match the data jack) on one end of a length of multiline cable.
3. Punch down the appropriate leads on the connector block.
4. Connect the network jack of the data modem to an outside telephone line. (If a line is not
reserved for remote programming, have a line switch installed so that on site personnel can
switch the outside telephone line between the data modem and the digital telephone system
cabinet when you are going to perform remote programming.)
5. Refer to the user’s manual for the modem, and program the modem to automatically answer
after the first ring.
6. Interface the VDT or PC with the modem at the programming site per the user’s manuals for
the equipment be used.
7. Establish a communications link for programming the system from a remote site.
•
If you have had a line switch installed at the customer site, call someone there and ask them
to set it for modem operation.
•
After the outside line is connected to the modem, make the data link between the
originating and the remote modems, and perform programming from your remote site just
as if the VDT or PC was connected directly to the system.
Digital Telephone System
IMI66–107
2 – 38 Installing The DSU
Summary of Contents for Air Impact DSU
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