4-220

MH89791

Advance Information

Figure 2 - MH89791 Circuit Description

Figure 3 - Switch Settings for Different Levels of Equalization

EQUALIZER

6dB Pad

Ring O

Tip O

60

Ω

60

Ω

60

Ω

60

Ω

60

Ω

60

Ω

120

Ω

Ring

Line

Tip

Line

EiT

TxT

EiR

TxR

60

Ω

60

Ω

60

Ω

60

Ω

60

Ω

60

Ω

120

Ω

240

Ω

240

Ω

S7

S6

1600pF

3600pF

468

Ω

S3

S2

S1

134.4

Ω

152.4

Ω

6.8

µH

15

µH

1600pF

3600pF

468

Ω

•

•

•

•

•

•

•

•

•

S5

S4

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

S1

S2

S3

S4

S5

S6

S7

-=SWITCH OPENED

X=SWITCH CLOSED

X

-X

-X

-X

-

X

-

-

-

-

-

-

-

-

-

-

--

-

-

-

-

-

-

X

X

-

-

X

-

X

-

X

-

X

-

X

-

-

X

-

-

X

-

-

X

X

-

-

X

X

-

-

X

-

-

-

X

-

X

X

X

-

-

X

X

X

X

X

-

X

X

X

X

X

X

X

X

--

-

INCREASING EQUALIZATION

NO EQUALIZATION

MAX. EQUALIZATION