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PBL38611-2

Subscriber Line Interface Circuit

Ericsson  

PBL 386 11/2

Ref

Parameter

fig

Four-wire to longitudinal balance, BFLE

4

Two-wire return loss, r

TIPX idle voltage, VTi

RINGX idle voltage, VRi

|VTR |

Four-wire transmit port (VTX)

Overload level, VTXO

5

Off-hook, IL ≥ 10mA

On-hook, IL ≤ 5mA

Output offset voltage, ∆VTX

Output impedance, zTX

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

Frequency response

Two-wire to four-wire, g2-4

6

Conditions

active state

BFLE = 20 • Log

ERX

VLo

0.2 kHz < f < 3.4 kHz

r = 20 • Log |ZTR + ZL|

|ZTR - ZL|

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

Load impedance > 20 kΩ,

1% THD, Note 4

0.2 kHz < f < 3.4 kHz

IRSN = 0 mA

0.2 kHz < f < 3.4 kHz

0.3 kHz < f < 3.4 kHz

Min

Typ

Max

40

58

25

27

23

- 1.2

VBat + 2.4

|VBat +4.5| |VBat + 3.6|

1.25

0.7

-60

60

5

20

GND +25

10

50

400

relative to 0 dBm, 1.0 kHz. ERX = 0 V

0.3 kHz < f < 3.4 kHz

-0.15

0.15

f = 8.0 kHz, 12 kHz, 16 kHz

-0.5

-0.1

0

Unit

dB

dB

dB

dB

V

V

V

VPeak

VPeak

mV

Ω

mV

Ω

ratio

dB

dB

C

VLo

RLT

RLR

TIPX

VTX

VTR PBL 386 11/2

RT

E RX

RINGX RSN

RRX

Figure 4. Metallic to longitudinal and

four-wire to longitudinal balance

1

ωC

<<

150

Ω,

RLT

= RLR = RL

/2 =300Ω

RT = 120 kΩ, RRX = 120 kΩ

RL

EL

4

C

ILDC

TIPX

VTX

PBL 386 11/2

RINGX RSN

RT

VTXO

RRX

Figure 5. Overload level, VTXO, four-wire

transmit port

1

ωC

<<

R,

L

R

L

=

600

Ω

RT = 120 kΩ, RRX = 120 kΩ

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