7.
Press the Send (Red) Button and the Send LED will turn on. You
have now tested the rack for correct wiring of the power supply and
Auto/Manual mode selection.
8.
Disconnect the power supply from the 115VAC source.
9.
Connect the telephone lines to the 2 Micro-ribbon Male connectors
as indicated in the schematic diagram at the back of this manual
which shows the connectors on the back of the TDD Detector Rack
Enclosure.
Manual Connection
- Connect only Tip# and Ring#. No other
connections are necessary.
Automatic Switch Connection
- Connect the Tip#, Ring#, OH# and
the Ground as indicated on the diagram. TipL# and RingL# are not
to be connected. The OH# and its GND connection are the
connections to the open switch element indicating when the
telephone line is Off/On hook. These connections should go only to
the switch element. The OH# connection is internally biased on the
TDD Detector card so no outside power connections are required.
Automatic Loop Current Detection
- In this mode the TDD
Detector card is placed in series ahead of the operator so that loop
current detection is accomplished. This requires 4 telephone line
connections to be made. Connect Tip# and Ring# as indicated. The
connections to the operator's equipment then come from the TipL#
and RingL# connections as shown on the diagram. Jumper J3 on the
TDD Detector card must be changed to the top position.
Note: The TDD Detector cards do not draw loop current. Therefore
loop current must be drawn by the operator's equipment for this
feature to operate (10mA. min).
10. Plug the 2 Micro-ribbon connectors into the back of TDD Detector
Rack Enclosure. Please note that Connector #1 is for lines 1-7 and
Connector #2 is for lines 8-15. Re-connect the 115 VAC power source
to the 12VDC power supply and press the Reset (Black) button on
Card #1 in the TDD Detector Rack Enclosure.
11. Perform the TDD Detector Installation Test (see below) for Card #1.
12. Disconnect the 115 VAC power source. Install the remaining TDD
Detector cards in the TDD Detector Rack Enclosure. Reinstall the
restraining bar using the 2 wing screws provided.
13. Re-connect the 115 VAC power source and press the Reset (Black)
button on each TDD Detector card. Test each line using the TDD
Detector Installation Test procedure given below.
