Toshiba FT-8808, Service Manual

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Telephone Line Unit Nominal Limit
Off-hook Impedance (at 1 kHz) ohm 1000 500 ~ 1500
Off-hook DC Resistance (DC 40 mA) ohm 250 100 ~ 300
On-hook Impedance 20 Hz (75 Vrms) kohm 25 > 10
Minimum Ringer Input Level V 25 < 40
Pulse Dialing
a. Dialing Rate 10 pps pps 10 8.0 ~ 11.0
b. Make Rario 10 pps % 40 36 ~ 42
DTMF Output (600
Ω
load)
a. Minimum Level On Single Tone Low Group dBm
−
7 >
−
10
High Group dBm
−
5 >
−
8
b. DTMF Level dBm
−
3 < 2
c. DTMF Frequency Row 1 Hz 697 687 ~ 707
Row 2 Hz 770 759 ~ 781
Row 3 Hz 852 840 ~ 864
Row 4 Hz 941 927 ~ 955
Column 1 Hz 1209 1191 ~ 1227
Column 2 Hz 1336 1316 ~ 1356
Column 3 Hz 1477 1455 ~ 1499
d. Signal Length msec 100 > 90
e. Interdigital Pause msec 100 > 90
Handset Unit
RECEIVER
Sensitivity 12 dB SINAD (CCITT Filter ON) dBm
−
115 <
−
107
Frequency Response 0.3 kHz dB 1
−
3.0 ~ +5.0
3.0 kHz dB
−
6.5
−
10.5 ~
−
2.5
Audio Output Level LO mV 65 46 ~ 92
HI mV 165 115 ~ 235
Distortion at 1 mV RF Input % 1.5 < 5
S/N ratio at 1 mV RF Input (CCITT Filter ON, Compander ON) dB 70 > 60
Selectivity (NQ20dB) 6 dB Bandwidth
−
kHz 13 > 10
6 dB Ban kHz 13 > 10
Ringer Level at 30 cm from Speaker (Bell Sound)
Frequency 2.2 kHz +2.0 kHz HI dBSPL 83 > 75
LO dBSPL 72.5 > 65
Page Level at 30 cm from Speaker
Frequency 2.0 kHz dBSPL 80 >75