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Single Line Telephones
DSX Software Manual Features ◆ 305
Features
Single Line Telephones
Description
The system is compatible with 500 type (dial pulse) and 2500 type (DTMF) analog telephone devices. This
includes on-premises single line telephones (SLTs), fax machines, and modems.
In DSX-40, SLTs connect to analog ports in the main equipment cabinet. In DSX-80/160, SLTs connect to
SLIU PCBs. Each analog port provides power and ring voltage for the connected SLT. The analog ports use
DTMF receivers. Each system provides 10 DTMF receivers that are shared by all connected analog ports.
Message Waiting
Both DSX-40 and DSX-80/160 support FSK Message Waiting lamps. DSX-80/160 also provides support for
high voltage Message Waiting lamps – while DSX-40 does not.
Ringing For Incoming Calls
Single line extensions ring according to the settings in
2132-[01-64]: Line Ringing (page 764)
. It is not
necessary to assign single line sets to Ring Groups to make them ring for incoming calls; they follow Key
Ring instead.
❥ In DSX-80/160 by default, the first 16 extensions (300-315) ring (option 2) for lines 1-12 and flash
(option 1) for lines 13-64. All other extensions have lamp only (no ringing) for all lines.
❥ In DSX-40 by default, all extensions (including single line sets) have immediate ring for all lines.
Ringer Equivalence Number (REN) Considerations
DSX-40
Single line telephones assigned to Key Ring or the same Ring Group will ring simultaneously. This is also
true for single line telephones connected to the same port. Since the Ringer Equivalence Numbers of con-
nected single line telephones are cumulative, you must do the following:
❥ Add up the RENs of all connected single line telephones.
❥ Be sure the total REN does not exceed 4 on any single port or system-wide.
Note that a REN of 1 is normal for an industry standard 2500 set with electromechanical ringer. Many
phones with electronic ringers have significantly lower RENs. Check the label on the bottom of each single
line telephone for the REN value.
DSX-80/160
Single line telephones assigned to Key Ring or the same Ring Group ring in pairs according to their SLIU PCB
port assignment. For example, ports 1 and 2 ring together, followed by 3 and 4, 5 and 6, and finally 7 and 8. If
the system has more than one SLIU PCB installed, the respective port pairs ring simultaneously on each card
(e.g., ports 1 and 2 ring simultaneously on each PCB). The SLIU provides the capability to support this ringing
arrangement, and REN calculations are not required. In DSX-80/160, there is not a REN limitation.
Conditions
• Dial Pulse (500 type) single line telephones cannot access any features that require the user to dial # or *.
• The system provides a pool of 10 DTMF receivers that are dynamically allocated as required.
Default Setting
• See Description above.
Connect analog devices such as single line telephones and fax machines to the system.