User's Manual

3
Written By: Belco International Co., Ltd. PAGE: 17 of 24
3.5.7 Tone Ringer (Base unit only)
The ringer shall be of the tone type, meeting the following specifications.
Component Parameter Min Max Units
Output level at ringer 110 dB SPL
Output level at 0.5 meter 68 dB SPL
3.5.8 Ring Sensitivity: Shall meet the para. 8.3.2 and 8.3.3.
3.5.9 On-Hook DC and AC impedance: Shall meet the para. 8.3.4 and 8.3.5.
3.5.10 OFF- hook Impedance: Shall meet the para. 8.3.6.
3.5.11 Buffer Size©
The redial buffer shall be capable of holding (and redialing) strings of at least
32digits.
3.5.12 Audio:
3.5.12.1 Buzz and Static noise: There shall be no buzzing or static sound from the
receiver.
3.5.12.2 Fading and Drop out: There shall be no audio fading or audio drop out when
user turns against a fixed location of the base unit in any direction.
3.5.12.3 Objective Loudness Ratings
( We need Confirm or specification – This model is earset Type )
The phone shall meet the following OLR limits over the range of loop condition
as following
0 kft 9 kft 15 kft
TOLR - 40 to - 53 - 38 to - 51 - 36 to - 49
ROLR 41 to 51 43 to 53 45 to 55
SOLR 14 to -2 16 to -1 17 to 0
Measurement procedures, please refer to EIA-470B standards.
3.5.12.4 Volume Control: Shall meet the HAC requirement.
change volume switch UP key shall increase the volume in 13 dB ± 1dB.