14 | Section 2
Connect to a Telos 1A2 Interface
Our earlier products, like our classic 1A2 interface didn’t support disconnect supervision
for callers “on air”. When using the Hx with a 1A2 interface, all features will work normally
though a caller selected to be “on air” who hangs up will cause the Hx to release the line (or “go
on-hook”). Audio is muted because the Hx has disconnected the line. e lamp on the switch
console and any key phones will remain lit until the line is “dropped” by the user.
You can easily build a control cable to go between the 1A2 interface and the Hx that connects
the on, o and ground signals. en plug your analog line into the “main” (hybrid #1) or “conf”
(hybrid #2) jack on the 1A2 interface, as appropriate.
Connect to a Telos Direct Interface Module
Using the Hx, or any hybrid supporting disconnect supervision with the Direct Interface
Module (DIM) requires an external source of loop current. e DIM provides only a “dry”
transformer audio feed which worked well with the simpler hybrids of the time. Visit the Telos
website or contact support for several options that will allow you to use the Hx with the DIM.
Connect to other systems? Contact Telos Support
Telos collects and shares what we learn about “real world” telephony with our customers. Our
customers come up with creative ways to use our products and often create elegant solutions for
unusual problems. We’d appreciate hearing about your successes and challenges to share with
other colleagues and friends. We’re also interested in your experiences with service providers and
telecom systems and equipment vendors.
2.8 Quick Basic Test
It’s all connected, Now it’s time to check for signs of life!
First, Power the unit up and watch it complete its self test.
If the phone line is connected properly, a “dot” should be present on the display, if a minus “-” is
displayed the Hx does not detect the line voltage on the idle POTS line. Check your wiring!
If your Hx is directly connected to a phone line, press the [ON] key and dial tone should be
present on the Hx’s output and RCV bargraph.
If you have your Hx connected to a 1A2 interface, press a line key on the switch console. e
Hx should come on and dial tone should be heard on it’s output and seen on the RCV bargraph.
Pressing the ‘drop’ key should release it, and the ‘hold’ key should put the line on hold. e
display will show a minus “-” to indicate that a line is not detected. is is because the 1A2
interface only routes a line to the Hx when one is selected by the user, and is present.
Verify correct mix minus operation at this point by noting that the RCV bargraph shows the
dial tone at at a nominal level, and that the SND bargraph shows only the microphone or audio
1A2 Interface DB-9 PIN Hx Hybrid DB-9 PIN
5 (#1 hybrid o) 3
9 (#1 hybrid on) 2
6 (Ground) 1
4 (#2 hybrid o) 5
3 (#2 hybrid on) 4
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