POTSwap v1.00 User Manual JA16-UM
Page 5 Rev: P09 Date: 01/03/18
© Copyright 2020 Janus Remote Communications
Specifications subject to change without notice
All Rights Reserved See website for latest revision. Not intended for life support applications.
3 Operation
3.1 Set-Up:
Operating the POTSwap with voice (telephone) equipment can be achieved through the following steps:
1. Gather the required equipment:
• POTSwap
• Power Supply - This can be hard-wired from a user supplied power source via the terminal block header
(See section 9 - Compatible Terminal Block Connectors) or using the optional wall transformer
(See section 11 - Accessories).
• Cellular antenna - A 5-band (‘penta-band’) GSM cellular antenna is recommended. An optional cellular
antenna is available (See section 11 - Accessories).
• GPS antenna - On units equiped with a GPS antenna connector, a GPS antenna may be connected.
(See section 11 - Accessories)
• The HSPA910PS model of the POTSwap requires an activated SIM card. Installation requires a Torx T10
screwdriver (See section 6 - SIM Card Installation).
2. Install the SIM card. The HSPA version POTSwap requires a mini (2FF size) SIM card.
See section 6 - SIM Card Installation..
3. Connect a cellular antenna to the SMA connector labeled ‘CELLULAR’. This can be a local antenna or a
remote antenna connected by a coaxial cable.
4. [Optional] Connect a GPS antenna to the SMA connector labeled ‘GPS’. (See Section 7 - GPS.)
5. Connect power to the unit.
Once powered, the unit should show a connection to the cellular carrier within a minute. This will be indicated by
a rapidly flashing GREEN ‘STATUS’ LED, a blinking ‘CELLULAR’ LED, and a steady signal strength indication on
the Received Signal Strength LED stack.
3.2 Voice Operation
Voice operation requires a standard voice telephone device to be connected to the POTSwap.
3.2.1 Placing calls:
When the connected telephone device is taken off hook, the POTSwap will present an audio dial tone signal.
Dialing can proceed with up to 30 digits being accepted. If the Dialing Tone Timeout (30 second default) elapses
before the first digit is dialed, the dialing session is ended by an Open Switching Interval (900 millisecond default).
If the Dialing Digit Timeout (4 second default) elapses after a dialed digit, dialing is concluded and a call to the
dialed number is placed. At any time the number sign (‘#’) can be dialed and the call is placed
immediatly, avoiding the Dialing Digit Timeout. Note that if Fixed Format Dialing is enabled, the
dialed number must consist of a ten digit phone number that includes the area code, or an eleven
number when the first digit is a ‘1’.
Firmware versions earlier than 150908 only allow dialing fixed format, 10 or 11 digit numbers.
Telephone devices that automatically take the phone off-hook and place a call to a fixed telephone
number are compatible with the POTSwap. Dialing digits should not be sent faster than 100 ms per
digit, with a minimum DTMF tone duration of 45 ms.
The POTSwap is compatible with DTMF dialing only. Pulse dialing will not work.
Figure 2 Voice Operation
Mobile
Network
PSTN
