Silicon Laboratories SI2494/39, SI2493/57/34/15/04 manual System Voice Modes, TAM Pstn

AN93

7.3.3.5. TAM PSTN

This mode is used to answer an incoming call with OGM playback and ICM recording. The caller may perform local TAM operations (i.e. record OGM, review ICM) via remote DTMF control. The modem is off-hook routing audio between the DAA and the DTE interface; however, audio is also available at the Si3000 (via UB5 path) so call screening is possible via the speaker (LINEO) while the microphone is muted. The modem voice path is configured for half-duplex audio with the speakerphone algorithm disabled. Side tone is disabled. Handset TX/RX coefficients are applied. The Si3000 is using the LINEI and LINEO signals with speakerphone gain settings. This mode is supported by the Si2418/29/36/38 parts.

Initialize

+

e

t

TAM

u

s

d

q

e

R

s

Handset

a

r

e

R

i

e

t

s

e

s

U

s

d

t

n

n

e

a

v

H

E

t

r

e

s

o

t

d

d

n

n

e

a

r

e

H

e

v

E

w

t

o

r

L

o

b

A

G

N

)

I

R

n

O

r

e

w

s

n

(A

k

o

o

-H

n

t

O

n

e

)

v

E

s

u

ro

e

m

u

TAM

(n

PSTN

	H
R			a
				n
a					d
	i
	s					s
		e					e
			dE					t
						v
							e
								n
									t

TAM

Hands-Free

		)
		k
		o
n t		o
		H
o n
t		-
t e n
u v O
B	E
	f t
P f e
	s
S O d
	n
	a
	H
	(

L
o H
w a
e n
r d
e s
d e
E	t
v
e
n
	t

R H a a i n s d e s d e E t v e n t

S			n	t
P
O			o
nB				n
			t
u			t e
			u v
E t
v t			B	E
e	o
		n	P n
n
t
			S O

Handset

						n
				o
			t
			t					t
		u
	B						n
P					e
S			v
		E
	n
O

Speakerphone

								t
							e				t
						s
				d						n
		n							e
a								v
H							E
					d
			e
	is
a
R

n

o

tt

u

PB

t

S

n

e

v

)

f

E

k

f

o

O

o

-H

ff

tO

e

s

d

n

a

(H

Figure 31. System Voice Modes

Rev. 1.3 193