User's Manual

• To detect line reverse, the unit shall detect PSTN line 1 and line 2 both polarity
changing within 10mS. If only one line polarity changing, it should not be polarity
changing. It should be line voltage interruption.
• After finish the call and go to idle stage, the unit shall not detect line reverse for
about 100mS from line releasing point.
• DC load shall be 90Kohm - 110Kohm.
• AC load impedance in the voice band shall be greater than 1800ohm and
preferable lower than 2400ohm.
3.7.9.2 DC/AC load release
• After detect the line reversal, if the unit does not detect the CID DTMF signal
within 1S.
• During receiving the DTMF, if detect the DTMF pause for more than 1 S.
• When received the DTMF ‘C” (Stop code).
• Ringer signal is received.
• OFF HOOK the telephone
3.7.9.3 DTMF signal detection
• A valid DTMF signal > 40mS shall be interpreted as a valid digit.
• A valid DTMF signal < 40mS shall not be interpreted as a valid digit.
• If not valid DTMF signal is present during > 40mS, this shall be interpreted as an
inter digit pause.
• If not valid DTMF signal is present during < 40mS, this shall not be interpreted as
an inter digit pause.
• A level > 37mV shall be recognized as a valid digit.
• A level < 28mV shall not be recognized as a valid digit.
3.8 Phonebook
The phonebook contains up to 50 names of 12 characters max. and numbers of 24 digits. Phonebook
is stored in PP EEPROM. One handset phonebook is independent from other locked handsets.
3.8.1 Dial a number of the phonebook list
To call a correspondent whose name you have saved in the phonebook:
• Press KEY_MEM/EXIT to enter the phonebook. The
will be ON.
[Display example]
• Press the first letter of the name; the first name that starts with this letter in the
alphabet appears. For instance to find names beginning by A, press once on
KEY_2, to find names beginning by B, press twice on KEY_2, to find names
beginning by C, press three times on KEY_2
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