You need either a filter for each device except the DSL modem, or a whole home filter which filters all the jacks, except the one which the DSL modem connects.
1	You	you	PRON	PRP	Case=Nom|Person=2|PronType=Prs	2	nsubj	2:nsubj	_
2	need	need	VERB	VBP	Mood=Ind|Number=Sing|Person=2|Tense=Pres|VerbForm=Fin	0	root	0:root	_
3	either	either	CCONJ	CC	_	5	cc:preconj	5:cc:preconj	_
4	a	a	DET	DT	Definite=Ind|PronType=Art	5	det	5:det	_
5	filter	filter	NOUN	NN	Number=Sing	2	obj	2:obj	_
6	for	for	ADP	IN	_	8	case	8:case	_
7	each	each	DET	DT	_	8	det	8:det	_
8	device	device	NOUN	NN	Number=Sing	5	nmod	5:nmod:for	_
9	except	except	ADP	IN	_	12	case	12:case	_
10	the	the	DET	DT	Definite=Def|PronType=Art	12	det	12:det	_
11	DSL	dsl	NOUN	NN	Number=Sing	12	compound	12:compound	_
12	modem	modem	NOUN	NN	Number=Sing	5	nmod	5:nmod:except	SpaceAfter=No
13	,	,	PUNCT	,	_	18	punct	18:punct	_
14	or	or	CCONJ	CC	_	18	cc	18:cc	_
15	a	a	DET	DT	Definite=Ind|PronType=Art	18	det	18:det	_
16	whole	whole	ADJ	JJ	Degree=Pos	18	amod	18:amod	_
17	home	home	NOUN	NN	Number=Sing	18	compound	18:compound	_
18	filter	filter	NOUN	NN	Number=Sing	5	conj	2:obj|5:conj:or|20:nsubj	_
19	which	which	PRON	WDT	PronType=Rel	20	nsubj	18:ref	_
20	filters	filter	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	18	acl:relcl	18:acl:relcl	_
21	all	all	DET	PDT	_	23	det:predet	23:det:predet	_
22	the	the	DET	DT	Definite=Def|PronType=Art	23	det	23:det	_
23	jacks	jack	NOUN	NNS	Number=Plur	20	obj	20:obj	SpaceAfter=No
24	,	,	PUNCT	,	_	23	punct	23:punct	_
25	except	except	ADP	IN	_	27	case	27:case	_
26	the	the	DET	DT	Definite=Def|PronType=Art	27	det	27:det	_
27	one	one	NOUN	NN	Number=Sing	23	nmod	23:nmod:except|32:obj	_
28	which	which	PRON	WDT	PronType=Rel	32	obj	27:ref	_
29	the	the	DET	DT	Definite=Def|PronType=Art	31	det	31:det	_
30	DSL	dsl	NOUN	NN	Number=Sing	31	compound	31:compound	_
31	modem	modem	NOUN	NN	Number=Sing	32	nsubj	32:nsubj	_
32	connects	connect	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	27	acl:relcl	27:acl:relcl	SpaceAfter=No
33	.	.	PUNCT	.	_	2	punct	2:punct	_
