PBL 386 11/2
Ref
fig
Parameter
Conditions
Min
Typ
Max
Unit
Four-wire to longitudinal balance, B
FLE
4
active state
E
RX
V
Lo
0.2 kHz < f < 3.4 kHz
|Z
TR
+ Z
L
|
r = 20 • Log
|Z
TR
- Z
L
|
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, I
L
= 0
active normal, I
L
= 0
active, I
L
= 0
B
FLE
= 20 • Log
40
58
dB
Two-wire return loss, r
25
27
23
- 1.2
V
Bat
+ 2.4
|V
Bat
+4.5| |V
Bat
+ 3.6|
TIPX idle voltage, V
Ti
RINGX idle voltage, V
Ri
|V
TR
|
Four-wire transmit port
(V
TX
)
Overload level, V
TXO
Off-hook, I
L
≥
10mA
On-hook, I
L
≤
5mA
Output offset voltage,
∆V
TX
Output impedance, z
TX
Four-wire receive port
(RSN)
Receive summing node (RSN) dc voltage
Receive summing node (RSN) impedance
Receive summing node (RSN)
current (I
RSN
) to metallic loop current (I
L
)
gain,α
RSN
Frequency response
Two-wire to four-wire, g
2-4
6
5
dB
dB
dB
V
V
V
Load impedance > 20 kΩ,
1% THD, Note 4
0.2 kHz < f < 3.4 kHz
I
RSN
= 0 mA
0.2 kHz < f < 3.4 kHz
0.3 kHz < f < 3.4 kHz
1.25
0.7
-60
5
60
20
V
Peak
V
Peak
mV
Ω
mV
Ω
ratio
GND +25
10
50
400
relative to 0 dBm, 1.0 kHz. E
RX
= 0 V
0.3 kHz < f < 3.4 kHz
f = 8.0 kHz, 12 kHz, 16 kHz
-0.15
-0.5
-0.1
0.15
0
dB
dB
TIPX
C
V
Lo
R
LT
V
TR
R
LR
RINGX
VTX
Figure 4. Metallic to longitudinal and
four-wire to longitudinal balance
1
<< 150
Ω,
R
LT
= R
LR
= R
L
/2 =300Ω
ωC
R
T
= 120 kΩ, R
RX
= 120 kΩ
R
RX
PBL 386 11/2
RSN
R
T
E
RX
C
R
L
I
LDC
E
L
TIPX
VTX
Figure 5. Overload level, V
TXO
, four-wire
transmit port
1
<< R
L
, R
L
= 600
Ω
ωC
R
T
= 120 kΩ, R
RX
= 120 kΩ
R
RX
PBL 386 11/2
RINGX
RSN
R
T
V
TXO
4
ERICSSON [ ERICSSON ]
