PBL 386 30/2
RFB
PBL 386 30/2
CTX
RTX
KR
-
PTG
VTX
-
0
+
+
RT
RRLY
HP
AGND
RSN
NC
RB
+12 V /+5V
CHP
RRX
0
CGG
NC
CODEC/
Filter
RF2
RR
RP2
RING
RINGX
BGND
TIPX
VBAT
VBAT2
PSG
NC
REF
PLC
POV
PLD
VCC
NC
RREF
RLC
ROV
RLD
CRC
CTC
VB
OVP
TIP
RF1
RP1
PBL 386 30/2
DVB2
VB2
VB
VCC
VCC
DBB
DVB
RSG
CVB2
CVCC
DET
C1
CLP
ERG
CVB
R1
LP
RRT
DT
C2
R2
DR
NU
C1
C2
SYSTEM CONTROL
INTERFACE
R3
R4
SLIC No. 2 etc.
OVP:
RESISTORS: (Values according to IEC E96
series)
CAPACITORS: (Values according to IEC
E96 series)
Secondary protection ( e. g. Power
Innovations TISPPBL2). The ground
terminals of the secondary protection should
be connected to the common ground on the
Printed Board Assembly with a track as
short and wide as possible, preferable a
groundplane.
RSG
RLD
ROV
RLC
RREF
RR
= 0 Ω
1% 1/10 W
1% 1/10 W
CVB
CVB2
CVCC
CTC
CRC
CHP
CLP
CTX
CGG
C1
= 100 nF
= 150 nF
= 100 nF
= 2,2 nF
= 2,2 nF
= 47 nF
100 V 10%
100 V 10%
10 V 10%
100 V 10%
100 V 10%
100 V 10%
100 V 10%
10 V 10%
100 V 10%
63 V 10%
63 V 10%
= 49,9 kΩ
= User programmable
= 32,4 kΩ
= 49,9 kΩ
= 64,9 kΩ
= 105 kΩ
= 24,9 kΩ
= 22,1 kΩ
= 52,3 kΩ
1% 1/10 W
1% 1/10 W
1% 1/10 W
1% 1/10 W
1% 1/10 W
1% 1/10 W
1% 1/10 W
NOTE:
RT
= 150 nF
= 100 nF
= 220 nF
= 330 nF
= 330 nF
RTX
RB
1. RP1 and RP2 may be omitted if DVB is in place.
RRX
RFB
R1
Depending on CODEC / filter
C2
= 604 kΩ
= 604 kΩ
= 249 kΩ
= 280 kΩ
= 330 Ω
1% 1/10 W
1% 1/10 W
1% 1/10 W
1% 1/10 W
5% 2 W
R2
DIODES:
DVB
R3
= 1N4448
= 1N4448
= 1N4448
R4
DVB2
RRT
RF1, RF2
RP1, RP2
DBB
= Line resistor, 40 Ω 1% match
= 10 Ω 1% 1/10 W,(Note 1)
Figure 11. Single-channel subscriber line interface with PBL 386 30/2 and combination CODEC/filter.
How to use POV:
Programmable overhead
voltage(POV)
With the POV function the overhead
voltage can be increased.
Observe that the 4-wire output terminal
VTX can not handle more than 3,2 VPeak.
So if the gain 2-wire to 4-wire is 0dB,
3,2 VPeak is maximum also for the 2-wire
side. Signal levels between 3,2 and
6,4 VPeak on the 2-wire side can be
handled with the PTG shorted so that the
gain G2-4S become -6,02dB. Please note
that the two-wire impedance, RR and the
4-wire to 4-wire gain has to be recalcu-
lated if the PTG is shorted.
1. Decide what overhead voltage(VTRO) is
needed. The POV function is only
needed if the overhead voltage
exceeds 3,2 VPeak
2. In figure 10 the corresponding ROV for
the decided VTRO can be found.
3. If the overhead voltage exceeds
3,2 VPeak, the G2-4S gain has to be
changed to -6,02dB by connecting the
PTG pin to AGND. Please note that
the two-wire impedance, RR and the 4-
wire to 4-wire gain has to be recalcu-
lated.
If the POV pin is left open the overhead
voltage is internally set to 3,2 VPeak in off-
hook and 1,3 VPeak on-hook. If a resistor
ROV is connected between the POV pin
and AGND, the overhead voltage can be
set to higher values, typical values can
be seen in figure 10. The ROV and
corresponding VTRO (signal headroom)
are typical values for THD <1% and the
signal frequency 1000Hz.
Please note that the maximum signal
current at the 2-wire side can not be
greater than 9 mA.
13
ERICSSON [ ERICSSON ]
