PBL 386 20/2
Ref
fig
Parameter
Conditions
Min
Typ
Max
Unit
Four-wire to longitudinal balance, B
FLE
4
0.2 kHz < f < 3.4 kHz
E
B
FLE
= 20 · Log
RX
V
Lo
r = 20 · Log
|Z
TR
+ Z
L
|
|Z
TR
- Z
L
|
40
50
dB
Two-wire return loss, r
TIPX idle voltage, V
Ti
RINGX idle voltage, V
Ri
V
TR
Four-wire transmit port
(VTX)
Overload level, V
TXO
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
0.2 kHz < f < 1.0 kHz
1.0 kHz < f < 3.4 kHz, Note 3
active, I
L
=0 mA
active, I
L
=0 mA
active, I
L
=0 mA
Load impedance > 20 kΩ,
1% THD, Note 4
30
20
35
22
- 1.1
V
Bat
+2.5
V
Bat
+3.6
dB
dB
V
V
V
V
Peak
V
Peak
mV
Ω
V
Ω
ratio
1.0
1.0
-100
0.2 kHz < f < 3.4 kHz
I
RSN
= -55
µA
0.2 kHz < f < 3.4 kHz
0.3 kHz < f < 3.4 kHz
1.15
15
1.25
8
200
100
50
1.35
20
relative to 0 dBm V
rms
, 1.0 kHz. E
RX
= 0 V
0.3 kHz < f < 3.4 kHz
-0.20
f = 8.0 kHz, 12 kHz, 16 kHz
-1.0
0.10
0.1
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
= 60 kΩ
R
RX
PBL 386 20/2
RSN
R
T
E
RX
C
R
L
I
LDC
E
L
Figure 5. Overload level, V
TXO
, four-wire
transmit port
TIPX
VTX
PBL 386 20/2
RINGX
RSN
R
T
V
TXO
1
<< R
L
, R
L
= 600
Ω
ωC
R
T
= 120 kΩ, R
RX
= 60 kΩ
R
RX
4
ERICSSON [ ERICSSON ]
