PBL 3764A/4, /6
Ref
fig
Parameter
Conditions
Min
Typ
Max
Unit
Four-wire to longitudinal balance, BFLE
4
0.2 kHz < f < 3.4 kHz
50
55
dB
ERX
BFLE = 20 • Log
VLo
ETR source removed
Two-wire return loss, r
|ZTR + ZL|
r = 20 • Log
|ZTR - ZL|
Z
TR ≈ ZL = nom. 600 Ω
0.2 kHz ≤ f ≤ 0.5 kHz
0.5 kHz ≤ f ≤1.0 kHz
25
27
23
dB
dB
dB
V
1.0 kHz ≤ f ≤ 3.4 kHz, Note 9
active, IL = 0, RSG = 0Ω
stand-by, IL = 0
TIPX idle voltage, VTi
-1.5
0.6
V
RINGX idle voltage, VRi
active, IL = 0, RSG = 0Ω
stand-by, IL = 0
-46.5
-48
V
V
TIPX-RINGX open loop
metallic voltage, VTR
IL = 0, RSG = 0Ω
VBat = -52V
43.0
3.1
45.0
47.0
V
Four-wire transmit port (VTX)
Overload level, VTXO
5
Load impedance > 20 kΩ,
1% THD, Note 3
VPeak
Output offset voltage, ∆VTX
0°C ≤ TAmb ≤ 70°C
-40°C ≤ TAmb ≤ 85°C
0.2 kHz ≤ f ≤ 3.4 kHz
-30
-40
30
40
20
mV
mV
Ω
Output impedance, zTX
<5
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
0
<10
1000
V
Ω
ratio
0.2 kHz ≤ f ≤ 3.4 kHz
0.3 KHz ≤ f ≤ 3.4 kHz
20
TIPX
5
VTX
21
R
LT
C
Figure 4. Metallic to longitudinal and
four-wire to longitudinal balance
E
R
T
TR
PBL 3764A/4
E
RX
V
L
O
R
LR
RINGX
6
RSN
19
1
<< 150 Ω, RLT =RLR = 300 Ω
ωC
R
RX
RT = 600 kΩ, RRX = 300 kΩ
C
TIPX
5
VTX
21
R
L
L
Figure 5. Overload level, VTXO, four-wire
transmit port
V
I
R
TXO
Ldc
PBL 3764A/4
T
1
RINGX
6
RSN
19
E
<< RL, RL= 600 Ω
ωC
R
RX
RT = 600 kΩ, RRX = 300 kΩ
4
ERICSSON [ ERICSSON ]
