Specifications

Installation IMl66-107
Data Communications With The Digital Telephone System
Arrange both station-to-line and station-to-station data
communications through the system telephones, using
a data device, a modem, and a data switch.
Equipment Required
0 Any data device (such as a VDT or a personal
computer equipped with communications software)
0 Any Hayes-compatible modem
0 A data switch (such as the model PC-787JJ-PS
from Precision Components Telephone, Addison IL,
60101, telephone [phone]). This data
switch is applicable for use with modems, FAX
machines, and audio tape recorders.
Connections
Refer to Figure 3-17, and connect the equipment as
illustrated. Use the cable supplied with the data switch
to make the connection between the switch and the
telephone handset jack, and use customer-supplied
cables to make the remaining connections. Make the
modem and data device connections using cabling
specified in the literature accompanying this
equipment.
Certain digital telephone models include a headset
jack located on the rear housing near the line jack.
You can use this headset jack for the data
communications path but you must make the following
changes to the illustrated connections:
0 Leave the handset connected to the telephone and
keep it on-hook.
0 Connect the accessory headset to the handset jack
of the data switch.
0 Connect the telephone jack of the data switch to the
headset jack of the telephone (instead of to the
handset jack as illustrated).
The data switch has a compatibility control located on
the bottom of the cabinet. Set this control to match the
telephone equipment being used. Change the settings
+/- 2 positions from the specified settings to provide
the quietest data path possible.
Use a flat blade screw driver to set the compatibility
control per the following chart:
OlSettinQ Condition
Position 5 Handset connected to data switch
Position 9
Headset connected to data switch
The data switch has a phase switch located on the
right side of the cabinet. Set this switch to the
NORMAL position (toward the rear of the cabinet).
It is very important to set the telephone volume
control to the minimum level when using the data
switch arrangement for data communications.
Communication Procedures
Station-To-Line
To make-a-data transmission to a distant site over a
CO/PBX line,
1.
2.
3.
4.
5.
Set data switch to VOICE.
Prepare modem and data device for data
communications. Refer to information supplied
with software and equipment.
Press telephone line button and hear dial tone.
Set data switch to DATA.
Issue dialing command to modem from data device
keyboard.
Station-lo-Station
To make a data transmission to another station
equipped and connected as shown in Figure 3-17,
1.
2.
3.
4.
5.
8.
7.
Set data switch to VOICE.
Prepare modem and data device for data
communications. Refer to information supplied
with software and equipment.
Press ITCM (INTERCOM on some models) on
telephone and hear dial tone.
Dial other station and set up voice call.
Type “ATXl D” on data device keyboard but do
press ENTER. Ask intercom party to type “ATA”
on their data device keyboard but do press
ENTER.
Complete voice conversation, ask intercom party to
set their data switch to DATA and to press ENTER
on their keyboard.
Set data switch to DATA, and press ENTER on
data device keyboard. Modems will automatically
complete data connection.
3-38