14

Am7945 Data Sheet

TEST CIRCUITS

A. Two- to Four-Wire Insertion Loss

2

2

A(TIP)

B(RING)

VTX

RSN

AGND

SLIC

B. Four- to Two-Wire Insertion Loss and Balance Return Signal

A(TIP)

B(RING)

VTX

RSN

AGND

SLIC

S2 Open, S1 Closed

S2 Closed, S1 Open

C. Longitudinal Balance

S2

2

2

S1

C

1

ωC

Note:

impedance of the line).

A(TIP)

B(RING)

VTX

RSN

AGND

SLIC

R

R

D. Two-Wire Return Loss Test Circuit

RSN

AGND

VTX

SLIC

B(RING)

A(TIP)