PBL38620-2 データシートの表示（PDF） - Ericsson

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PBL38620-2

Subscriber Line Interface Circuit

Ericsson  

PBL 386 20/2

Notes

1. The overload level can be adjusted with the resistor ROV

for higher levels e.g. min 3.1 V and is specified at the

Peak

two-wire port with the signal source at the four-wire receive

port.

2. The two-wire impedance is programmable by selection of

external component values according to:

ZTRX = ZT/|G2-4S α RSN| where:

ZTRX = impedance between the TIPX and RINGX

terminals

Z = programming network between the VTX and RSN

T

terminals

G2-4S = transmit gain, nominally = 1 (or 0.5 see pin PTG)

α RSN = receive current gain, nominally = 200 (current

defined as positive flowing into the receivesumm-

ing node, RSN, and when flowing from ring to tip).

3. Higher return loss values can be achieved by adding a

reactive component to R , the two-wire terminating

T

impedance programming resistance, e.g. by dividing RT

into two equal halves and connecting a capacitor from the

common point to ground.

4. The overload level can be adjusted with the resistor R OV

for higher levels e.g. min 3.1 VPeak and is specified at the

four-wire transmit port, VTX, with the signal source at the

two-wire port. Note that the gain from the two-wire port to

the four-wire transmit port is G = 1 (or 0.5 see pin PTG)

2-4S

5. Pin PTG = Open sets transmit gain to nom. 0.0dB

Pin PTG = AGND sets transmit gain to nom. -6.02 dB

Secondary protection resistors R and tertiary protection

F

resistors RP impact the insertion loss as explained in the

text, section Transmission. The specified insertion loss is

for R = R = 0.

F

P

6. The specified insertion loss tolerance does not include

errors caused by external components.

7. The level is specified at the two-wire port.

8. The two-wire idle noise is specified with the port

terminated in 600 ohms (RL) and with the four-wire receive

port grounded (ERX = 0; see figure 6).

The four-wire idle noise at VTX is specified with the two-

wire port terminated in 600 ohms (R L). The noise

specification is referenced to a 600 ohm programmed two-

wire impedance level at VTX. The four-wire receive port is

grounded (E RX = 0).

7

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