User's Manual

Specifications | 249
Signalling
Feed voltage output -48 V (160 + 160 Ω voltage source current limited)
Loop current limit 35 mA
Seize signal Loop start only (no ground start)
Loop detect threshold 10 - 12 mA (step function between on hook and off hook)
Non loop current 4 - 6 mA (step function between on hook and off hook)
Pulse dialing Transparent decadic signalling at 7 - 14 PPS with break
period limits of 60 - 73 % (with loop current > 23 mA)
Pulse distortion 4:1 multiplexed < 2.250 ms
Non-multiplexed
≤ 250 µs
Reversals output Line polarity reversal output (optional)
Metering output voltage 12 kHz / 16 kHz billing tone generation with four selectable
output voltages of 100 mV, 200 mV, 300 mV and 400 mV rms
into 200 Ω sourced via the Line Impedance setting but limited
to a maximum open circuit voltage of 1 Vrms.
Ringer waveform Sinusoidal with a maximum total distortion of 10% (into 3 REN
load)
Ringer voltage (open circuit) Five selectable ringer output voltages sourced via an internal
ringing resistance of 178
Ω per port.
The ringing output is a composite balanced AC ringing voltage
with a differential DC offset voltage.
60 Vrms + 0 VDC
55 Vrms + 10 VDC
50 Vrms + 18 VDC
45 Vrms + 22 VDC
40 Vrms + 24 VDC
Ringer frequency output Options of 17, 25 or 50 Hz ±5%
Ringer power output 60 Vrms source into a load of 2 REN
45 Vrms source into a load of 3 REN
(1 REN
≈ 6930 Ω in series with 8 μF)
Ring Trip Ring Trip will ocurr in < 150 ms following DC loop of > 15 mA
Ring Trip Immunity Ring Trip will not ocurr if the DFXS outputs ringing into a load
of 500
Ω in series with 4.4μF or less.
Physical
Physical interface Dual RJ-45 per port (1 line port, 1 monitor port)
Line protection Secondary protection (4RF recommends the use of external
primary protection in lightning prone areas)
Diagnostics
Green Led Green LED
On: Normal operation
Solid: Off-hook
Flashing: Ringing
Yellow LED On: Alarm
Flashing: Loopback