Adding Cable boxes to existing internet service? Help!

[Sanchez5]

Currently, I have already ran my own coax from the street into the house all the way to my modem that is providing me internet. I'm looking to bundle TV and Internet and need to know what the process is adding the two TV's to my service. Is it as easy as adding a splitter in the attic turning my main trunk from the street into a three way?

TLDR: I have xfinity internet with my own cable ran, how do I add two TV's to my existing service?

[EG]

Yes. Use an unbalanced 3-way splitter and put the modem on the -3.5 dB leg and the cable boxes for the TV's on the -7 dB legs. As long as the incoming signal strength is adequate, it should be fine.

https://www.amazon.com/Extreme-Unbalanced-Digital-Performance-Splitter/dp/B009FN72PO

[Sanchez5]

Thank you very much for your prompt and informative response, regarding the incoming signal strength how would I know if it is adequate? Here is my Arris SB6183 information on the ~200Mbps service:

Procedure	Status	Comment
Acquire Downstream Channel		Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Configuration File	OK
Security	Enabled	BPI+
DOCSIS Network Access Enabled	Allowed

Downstream Bonded Channels

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR	Corrected	Uncorrectables
1	Locked	QAM256	5	483000000 Hz	-4.0 dBmV	41.1 dB	0	0
2	Locked	QAM256	1	459000000 Hz	-4.0 dBmV	41.2 dB	0	0
3	Locked	QAM256	2	465000000 Hz	-4.0 dBmV	41.3 dB	0	0
4	Locked	QAM256	3	471000000 Hz	-4.0 dBmV	41.2 dB	0	0
5	Locked	QAM256	4	477000000 Hz	-4.0 dBmV	41.2 dB	0	0
6	Locked	QAM256	6	489000000 Hz	-3.9 dBmV	41.2 dB	0	0
7	Locked	QAM256	7	519000000 Hz	-4.4 dBmV	40.9 dB	0	0
8	Locked	QAM256	8	525000000 Hz	-4.7 dBmV	40.7 dB	0	0
9	Locked	QAM256	9	531000000 Hz	-5.0 dBmV	40.6 dB	0	0
10	Locked	QAM256	10	537000000 Hz	-5.3 dBmV	40.4 dB	0	0
11	Locked	QAM256	11	543000000 Hz	-5.3 dBmV	40.4 dB	0	0
12	Locked	QAM256	12	549000000 Hz	-5.5 dBmV	40.3 dB	0	0
13	Locked	QAM256	13	555000000 Hz	-5.5 dBmV	40.3 dB	0	0
14	Locked	QAM256	14	561000000 Hz	-5.6 dBmV	40.3 dB	0	0
15	Locked	QAM256	15	567000000 Hz	-5.7 dBmV	40.3 dB	0	0
16	Locked	QAM256	16	573000000 Hz	-5.6 dBmV	40.3 dB	0	0

Upstream Bonded Channels

Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	2	5120 Ksym/sec	23700000 Hz	44.3 dBmV
2	Locked	ATDMA	1	5120 Ksym/sec	17300000 Hz	44.3 dBmV
3	Locked	ATDMA	3	5120 Ksym/sec	30100000 Hz	44.3 dBmV
4	Locked	ATDMA	4	5120 Ksym/sec	36500000 Hz	44.3 dBmV

Current System Time: Fri Jul 31 09:59:45 2020

[EG]

You can't know for sure until you try it and see. The downstream is on the weak side but is still within spec. Give it a shot.