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6
TT-1 Plus Installation and Operation Manual
INSTALLATION
Relay connections:
The “OFF-HOOK” relay K1 can be used to indicate when the
TT-1 Plus is off-hook. Connect to the K1-CM (wiper) and K1-NO (normally open)
terminals or the K1-NC (normally closed) terminal. When the line is answered
(seized), the normally open contacts will close and the front panel “HOOK” LED
will light.
Remote Seize Input:
Connect a positive voltage (no greater than 6 VDC) to the
Seize + terminal and ground to the Seize – terminal to seize (answer) the (call) line.
Remote Drop Input:
Connect a positive voltage (no greater than 6 VDC) to the
Drop + terminal and ground to the Drop – terminal to drop (disconnect) the (call)
line.
Ring LED:
Front panel LED will light when the coupler is called. The TT-1 Plus
will go off-hook during or after the first ring.
Hook LED:
Lights when the TT-1 Plus has seized the telephone line.
Unmute/Mute Switch:
Disconnects the SEND and CALLER audio from the
hybrid with the switch IN. At the factory this feature is disabled on the CALLER
side by placing SW-1 and SW-2 in the on position. Placing SW-1 and SW-2 in the
off position allows the mute switch to mute both the send and caller audio.
Auto-Answer/Monitor (TAP) Switch:
Used to select between the auto-answer
mode and the TAP mode. When the switch is OUT, the TT-1 Plus will auto-answer
any call on the first ring. When this switch is IN, the TT-1 Plus will TAP (monitor)
a telephone line without seizing the line.
Null adjustment trimmer:
Used to adjust the null between the send and caller
audio. To adjust the null on the TT-1 Plus, follow the steps:
1 - Connect a telephone line to the RJ-11 line jack.
2 - Connect an audio source to the SEND +/- terminals. Use a 700 hz tone at
–9dBm.
3 - Connect a dB meter to the /- terminals. Be sure to terminate with
600 ohms.
4 - Make a call to the TT-1 Plus. After the TT-1 Plus answers, adjust the NULL
trimmer for minimum (NULL) level on the (CALLER) dB meter.
The TT-1 Plus is now ready for normal operation. Please refer to Appendix C of this
manual for an example mixer hookup diagram.
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