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|
Comprehensive Local Loop Testing for Voice,
Data, Fax and Internet Services
Hand-Held Field Test Unit Line
Interface Specifications
| Input |
2-Wire
Loop |
| Holding |
³
20 ma 42.5 to 105 VDC open circuit voltage with line resistance of
1700W. Compatible with constant current source |
| DC
Blocking |
150
VDC |
| Balance |
>90
dB, 50 to 120 Hz, decreasing 6 dB/Octave above 120 Hz |
| Termination |
600
or 900W or complex imepdence; return loss ³30 dB from 200 to 4000
Hz, ³15 dB from 20 to 5000 Hz |
| Listen
and Talk |
Built-in
speaker (standard)
Talk capabilities (optional) |
| Return
Loss Termination |
600W
or 900W (1%) in series with 2.16 m (3%) or custom termination |
| AC
Bridging Impedance |
>
20,000W, 50 to 5000 Hz |
| AC
Impedance to Ground |
>
20,000W, tip or ring to ground |
| Signaling |
|
|
Dial Pulse |
10
PPS, accuracy ± 2 PPS, 60% break, accuracy ±2%, 700 msec.
interdigit timing |
|
DTFM |
|
|
Frequency |
±0.5%
of Bell standard frequencies |
|
Level |
-7.0
dBm0 per tone, accuracy ±0.5 dB |
|
Timing |
50
msec. On/Off, accuracy 0.5 msec. |
AC and DC Test Measurements:
| DC
Measurements: |
|
|
Range |
+99 VDC to
-99 VDC (with overrange indication) |
|
Voltage Resolution |
0.1 VDC |
|
Voltage Accuracy |
±2% of
reading, ±0.3 VDC |
|
DC Measurement Modes |
Tip-to-Ring
Tip-to-Ground
Ring-to-Ground |
|
Tip-to-Ring Current |
Range: ±125
mA |
|
Resolution |
1 mA DC |
|
Accuracy |
±2% of
reading, ±1 mA DC |
| AC
Measurements |
|
|
Voltage Range |
0 to 150 V
rms |
|
Voltage Resolution |
1 V rms |
|
Voltage Accuracy |
±2% of
reading, ±0.5 V rms |
|
Frequency Range |
20 to 120 Hz |
|
Frequency Resolution |
1 Hz |
|
Frequency Accuracy |
±1 Hz |
| Ringing |
|
|
Ring Detect |
40 V rms ±8
V |
|
Termination |
(1 REN)
resistor in series with capacitor;
impedance = 8000W @ 20 Hz, 1.5 watts;
impedance ³ 7000W @ 70 Hz |
| Isolation |
|
Tip
and ring and station ground are isolated from data interface
connector, charging connector, and case by more than 500 Volts.
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