PBL386612 Ver la hoja de datos (PDF) - Ericsson

Número de pieza

componentes Descripción

Fabricante

PBL386612

Subscriber Line Interface Circuit

Ericsson  

Preliminary

PBL 386 61/2

Notes

1. The overload level is automatically expanded when the

signal level > 3.1 VPeak and is specified at the 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:

ZTR = ZT/|G2-4S αRSN| where:

ZTR = impedance between the TIPX and RINGX

terminals

ZT = programming network between the VTX and RSN

terminals

G2-4S = transmit gain, nominally = -0.5

αRSN = receive current gain, nominally = 400 (current

defined as positive flowing into the receivesumm-

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

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

reactive component to RT, the two-wire terminating

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 is automatically expanded as needed up

to 3.1 VPeak when the signal level >1.55 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 G2-4S = -0.5.

5. Secondary protection resistors RF impact the insertion loss

as explained in the text, section Transmission. The

specified insertion loss is for RF = 0.

6. The specified insertion loss tolerance does not include

errors caused by external components.

7. The level is specified at the four-wire receive port and

referenced to a 600 Ω programmed two-wire impedance

level.

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

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

The four-wire idle noise at VTX is the two-wire value -6 dB

and is specified with the two-wire port terminated in 600 Ω

(RL). The noise specification is referenced to a 600 Ω

programmed two-wire impedance level at VTX. The four-

wire receive port is grounded (ERX = 0).

7

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