BASIC EXTENSION PROGRAMMING TASKS DX-120 Programming Manual
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Configuring Single Line Telephones
(Analog Device Support)
• Analog extension ports are provided for connection of standard, two-wire, analog telephone equipment to the
digital network of the DX-120.
- Common uses of the analog extension ports are facsimile machines, modems, and wireless and wired single
line analog telephones.
• The DX-120 system basic configuration has four standard analog extension ports available.
- As the system expands, you can install a second APM4 (Analog Port Module-4 port) to KSU2.
- Each APM4 provides four dedicated DTMF receivers for decoding the dialed digits from the connected device
(each analog port has a dedicated DTMF receiver).
• To place calls, the analog device must provide DTMF tone signaling, which is decoded by the APM4 for call
processing instructions.
- Each analog port provides 25 – cycle, (frequency) ringing for the attached analog device.
• Since each APM4 provides dedicated DTMF receivers and ringing generators, and because the system has a
non-blocking digital ICM bus, the Single Line Telephones/Analog Devices are not traffic sensitive and do not
require special traffic balancing.
• Conditions for Setting Up Single Line Telephones.
- You can connect any single line (2500 type) telephone equipment to the system using one of the standard
analog ports available on the Analog Port Module (APM4).
- Analog ports are dedicated to the extension directory numbers system resource. You can assign these
directory numbers while programming the system.
- The allocation of DTMF Receivers (required resource to receive dialed digits from analog devices) is one to
one in the DX-120 system. That is, the system provides one DTMF receiver per analog port for decoding
DTMF signals dialed by analog devices/SLT users.
NOTE
Whenever extension users want to invoke a system feature at a single line telephone,
they must operate the hook-switch in a fashion that is distinguishable from an on-hook
(hang up) request.
Considering this, the DX-120 system allows you to customize the
hook-switch command monitoring.
HINT
Also see “Establishing Start and End of SLT Hook Flash” on page 228.
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