PBL 386 11/2
Ref
fig
Parameter
Conditions
Min
Typ
Max
Unit
Four-wire to longitudinal balance, BFLE
4
active state
ERX
VLo
BFLE = 20 • Log
0.2 kHz < f < 3.4 kHz
40
58
dB
Two-wire return loss, r
|ZTR + ZL|
|ZTR - ZL|
r = 20 • Log
0.2 kHz < f < 0.5 kHz
0.5 kHz < f < 1.0 kHz
1.0 kHz < f < 3.4 kHz, Note 3
active normal, IL = 0
active normal, IL = 0
active, IL = 0
25
27
23
dB
dB
dB
V
V
V
TIPX idle voltage, VTi
RINGX idle voltage, VRi
- 1.2
VBat + 2.4
|VTR
|
|VBat +4.5| |VBat + 3.6|
Four-wire transmit port (VTX)
Overload level, VTXO
5
Off-hook, IL ≥ 10mA
On-hook, IL ≤ 5mA
Output offset voltage, ∆VTX
Output impedance, zTX
Load impedance > 20 kΩ,
1% THD, Note 4
1.25
0.7
-60
5
VPeak
VPeak
mV
Ω
60
20
0.2 kHz < f < 3.4 kHz
Four-wire receive port (RSN)
Receive summing node (RSN) dc voltage
Receive summing node (RSN) impedance
Receive summing node (RSN)
current (IRSN) to metallic loop current (IL)
gain,αRSN
I
RSN = 0 mA
GND +25
10
mV
Ω
0.2 kHz < f < 3.4 kHz
0.3 kHz < f < 3.4 kHz
50
400
ratio
Frequency response
Two-wire to four-wire, g2-4
6
relative to 0 dBm, 1.0 kHz. ERX = 0 V
0.3 kHz < f < 3.4 kHz
-0.15
-0.5
0.15
0
dB
dB
f = 8.0 kHz, 12 kHz, 16 kHz
-0.1
Figure 4. Metallic to longitudinal and
four-wire to longitudinal balance
TIPX
VTX
RLT
C
1
<< 150 Ω, RLT = RLR = RL /2=300Ω
ωC
VTR
RT
PBL 386 11/2
ERX
VLo
RLR
RINGX
RSN
RT = 120 kΩ, RRX = 120 kΩ
RRX
Figure 5. Overload level, VTXO, four-wire
transmit port
C
TIPX
VTX
RL
EL
1
<< RL, RL = 600 Ω
ωC
ILDC
RT
VTXO
PBL 386 11/2
RT = 120 kΩ, RRX = 120 kΩ
RINGX
RSN
RRX
4
ERICSSON [ ERICSSON ]
