User manual
2.3 Overview of FXS ports
FXS (Foreign Exchange Station) ports are commonly used to connect analog telephone sets to a CO (Central
Ofce) They can be found as a regular RJ11 wall jacks in every household or ofces equipped with analog
telephone lines.
RJ11 jacks usually have 6 pins, but only pins 3 and 4 are being used.
PSTN simulator comes with 8-pin RJ45 jacks where only pins 4 and 5 are being used.
PSTN Simulators can accept standard RJ11 connector without any additional rewiring.
Each FXS port on PSTN simulator has two integrated Green LED: Left and Right.
LEDs on FXS ports provide visual indication for call progress states, indication of Connect, Disconnect, on
hook and off hook modes.
LED Legend
Right LED - OFF Telephone set is ON HOOK or not Connected
LEFT LED - OFF No active or in progress outgoing calls
Right LED - Solid Green Telephone set if OFF HOOK
Right LED - Blinking GREEN Incoming call is in progress
Left LED - Solid GREEN Call is established
Left LED - Blinking GREEN Outgoing call is in progress
2.4 Audio IN/OUT ports
4 and 8 port PSTN Simulator comes with two standard audio ports: Input and Output.
Audio Input (Audio In) port can be used as a source of Music On Hold (MOH), Audio Output (Audio Out) port
can be used for monitoring or recording conversations originated or terminated at any FXS or PRI ports.
Located on the back of the enclosure audio ports are equipped with standard 3.5mm mono jacks with 600-
Ohm impedance.
2.5 DB9 port
DB9 port provides communication between PSTN simulator and PSTN Manager application which runs on
Windows platform. Standard straight-through Serial cable should be used to connect simulator to a PC. Latest
version if simulators are being equipped with USB ports.
2.6 Power Adapter
PSTN simulator is shipped with a desktop or wall type power adapter with a 2.5mm output jack.
PSTN simulator can accept power source with a range of 12V-20V AC or DC with a current rating of 1.5A.
Switching or Linear adapters can be used. For applications that require low noise levels linear adapters are
recommended.
Please be aware that power adapter can get warm during normal operation and require proper ventilation to
operate. Do not block airow to and from power adapter.
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User Manual
Public Switched Telephone Network (PSTN) Simulators