turn the modem off and see if the sound is still there... could be static on the line... if the sound is still there with the modem off then the problem is NOT the DSL....
1	turn	turn	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	0:root	_
2	the	the	DET	DT	Definite=Def|PronType=Art	3	det	3:det	_
3	modem	modem	NOUN	NN	Number=Sing	1	obj	1:obj	_
4	off	off	ADP	RP	_	1	compound:prt	1:compound:prt	_
5	and	and	CCONJ	CC	_	6	cc	6:cc	_
6	see	see	VERB	VB	Mood=Imp|VerbForm=Fin	1	conj	1:conj:and	_
7	if	if	SCONJ	IN	_	12	mark	12:mark	_
8	the	the	DET	DT	Definite=Def|PronType=Art	9	det	9:det	_
9	sound	sound	NOUN	NN	Number=Sing	12	nsubj	12:nsubj	_
10	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	12	cop	12:cop	_
11	still	still	ADV	RB	_	12	advmod	12:advmod	_
12	there	there	ADV	RB	PronType=Dem	6	advcl	6:advcl:if	SpaceAfter=No
13	...	...	PUNCT	,	_	1	punct	1:punct	_
14	could	could	AUX	MD	VerbForm=Fin	16	aux	16:aux	_
15	be	be	AUX	VB	VerbForm=Inf	16	cop	16:cop	_
16	static	static	NOUN	NN	Number=Sing	1	parataxis	1:parataxis	_
17	on	on	ADP	IN	_	19	case	19:case	_
18	the	the	DET	DT	Definite=Def|PronType=Art	19	det	19:det	_
19	line	line	NOUN	NN	Number=Sing	16	nmod	16:nmod:on	SpaceAfter=No
20	...	...	PUNCT	,	_	1	punct	1:punct	_
21	if	if	SCONJ	IN	_	26	mark	26:mark	_
22	the	the	DET	DT	Definite=Def|PronType=Art	23	det	23:det	_
23	sound	sound	NOUN	NN	Number=Sing	26	nsubj	26:nsubj	_
24	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	26	cop	26:cop	_
25	still	still	ADV	RB	_	26	advmod	26:advmod	_
26	there	there	ADV	RB	PronType=Dem	37	advcl	37:advcl:if	_
27	with	with	SCONJ	IN	_	30	mark	30:mark	_
28	the	the	DET	DT	Definite=Def|PronType=Art	29	det	29:det	_
29	modem	modem	NOUN	NN	Number=Sing	30	nsubj	30:nsubj	_
30	off	off	ADV	RB	_	26	advcl	26:advcl:with	_
31	then	then	ADV	RB	PronType=Dem	37	advmod	37:advmod	_
32	the	the	DET	DT	Definite=Def|PronType=Art	33	det	33:det	_
33	problem	problem	NOUN	NN	Number=Sing	37	nsubj	37:nsubj	_
34	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	37	cop	37:cop	_
35	NOT	not	PART	RB	_	37	advmod	37:advmod	_
36	the	the	DET	DT	Definite=Def|PronType=Art	37	det	37:det	_
37	DSL	dsl	NOUN	NN	Number=Sing	1	parataxis	1:parataxis	SpaceAfter=No
38	....	....	PUNCT	.	_	1	punct	1:punct	_
