SM55 Rev. 4.00
PTA12-000 POTS Telephone Adapter Manual
Off-hook
Condition:
Impedance:
600 Ohms
±
5% @ 1kHz
Circuitry Type:
Balanced
DC loop current:
25 mA (typical) to 120 mA (max)
DC voltage:
≤
9.0 Vdc @ 25mA loop current
Freq. Response:
≤
3 dB roll-off from 350 to 3000 Hz
Distortion:
≤
5% THD
Audio Noise:
≤
-50 dB from rated output (no signal)
Available Audio:
TX Audio, RX Audio.
TX Audio:
Mic Input to tip/ring: 775 mVrms (0 dBm) with < 5% THD
Test condition:
170 mVrms @ 1 kHz into Mic input,
Mic level potentiometer set to max
RX Audio:
Typical expected audio level:
77.5 to 775 mVrms
(-20 to 0 dBm)
DTMF signaling:
Standard DTMF frequencies used: 0 - 9,
✱
, #
Frequency tolerance:
±
1.5 %
DTMF TX on tip/ring (DTMF level potentiometer set to max.):
High group
-2.2 dBm
±
1.0 dB.
-2.2 dBm
±
2.5 dB (short time high operating temperature).
Low group
-4.2 dBm
±
1.0 dB.
-4.2 dBm
±
2.5 dB (short time high operating temperature).
Miscellaneous
HOLD
TX mic muting:
≤
-60 dB from rated output
RX phones muting:
≤
-85 dB from rated output
Sidetone muting:
≤
-90 dB from rated output
REDIAL
Typical tone duration: 82
±
8 ms
Typical inter-digit pause time: 82
±
8 ms
VOL
Dynamic range: 40
±
3dB
1.4.2 Physical
Specifications
Height
1.12” (28.4 mm)
Width
5.75” (146.1 mm) in front of panel
4.80” (121.9 mm) behind panel
Depth
4.17” (105.9 mm) behind panel, including connector
Weight
0.63 lbs. (0.29 kg).
Nov 12, 2003
Page 1-3
ENG-FORM: 800-0106.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
