PBL386112 Просмотр технического описания (PDF) - Ericsson

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PBL386112

Subscriber Line Interface Circuit

Ericsson  

PBL 386 11/2

A

DC characteristics

B

C

B

C

D

D

VTR [V]

A:

IL (@ VTR = 0) = ILConst

ILConst (typ) = ILProg =

500

R (14)

LC

B, C: IL = ILConst VTR = VBatVirt - RFeed • (ILProg - 5•10-3)

D:

RFeed =

RSG

400

+ 40

E: IL ≈ 5 mA

F:

Apparent battery VApp (@IL = 0) = VBatVirt + 5•10-3 • RFeed

G: RFeedG = 2 • 25 Ω

H:

VTRMax = |VBat| - VBOH

J:

Virtual battery VBatVirt (@ IL = 5 mA) = |VBat| - 6.1(17)

E

J

G

F

HF

Figure 14. Battery feed characteristics (without the protection resistors on the line).

Active State

TIPX is the terminal closest to ground and

sources loop current while RINGX is the

more negative terminal and sinks loop cur-

rent. The loop current or the ground key

detector is activated. The loop current de-

tector indicates off hook with a logic low

level and the ground key detector indicates

active ground key with a logic high level

present at the detector output.

Active Polarity Reversal State

TIPX and RINGX polarity is reversed com-

pared to the Active State: RINGX is the

terminal closest to ground and sources

loop current while TIPX is the more nega-

tive terminal and sinks current. The loop

current or the ground key detector is acti-

vated. The loop current detector will indi-

cate off hook with a logic low level and the

ground key detector will indicate active

ground key with a logic high level present at

the detector output.

Overvoltage Protection

PBL 386 11/2 must be protected against

overvoltages on the telephone line. The

overvoltages could be caused for instance

by lightning, ac power contact and induc-

tion. Refer to Maximum Ratings, TIPX and

RINGX terminals, for maximum continu-

ous and transient voltages.

16

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