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Internet Speeds ?

Regular Contributor

Internet Speeds ?

Hi,

I've been with Comcast since 1999.  I'm currently renting a Comcast issued ArrisCM820A cable modem.  SW Rev: 9.1.103.M2AJ.CT.

Over the years, I get messages from Comcast that they are increasing my down/up speeds.  The latest increase, starting yesterday, is from 150/5 to 175/5.

Even when connected directly to the Arris modem, my speeds have been 75/6.  I have never gotten more than 1/2 of what I was supposed to be getting.  I never complained, since the 75 down has been adequate for my needs.

But yesterday a Comcast salesman called me and wanted to sell me a contract (I've been out of contract for years, and I like it that way).  He said he could give me more than the 200 channels I'm getting now, and he could increase my speeds.  I said I don't stream, I only watch about 10 channels (no HBO, Starz, etc, don't watch movies), and I don't get 1/2 the speed I pay for as it is.  Why would I want to change?

Anyway, I know the Arris CM820 is an old model, but is it capable of higher than 75 download speed?  That is, is my modem the weak link?

Thanks.

Regular Contributor

Re: Internet Speeds ?

I see the advertising for the CM820, or the Arris site, says:

 

"The Touchstone CM820 DOCSIS 3.0 8x4 Cable Modem delivers ultra-high speed data access to cable service subscribers’ homes and businesses."

"With the CM820, cable operators can offer data services at speeds greater than 300Mbps to their subscribers to compete against VDSL and fiber to the home threats."

Hmmm...I don't know what to think.

 

Diamond Problem Solver

Re: Internet Speeds ?

Your modem could be the weak link. If you rent the modem you can do much better. It will also depend on what you’re testing speeds on, if it’s capable of testing at faster speeds (75 might be it).

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Expert

Re: Internet Speeds ?


@anon86290 wrote:

 

Anyway, I know the Arris CM820 is an old model, but is it capable of higher than 75 download speed?  


Comcast rates it for 285. That's the only rating that matters ! But you should be getting more than 75 !

 

https://mydeviceinfo.xfinity.com/device/arris-cm820a-425

 

What do the modem's signal stats look like ? Try getting them here; http://192.168.100.1

Please post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.

Is there a router / WiFi in the mix here ?



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Regular Contributor

Re: Internet Speeds ?

I shut down modem and pc.  Waited.   Booted  up modem.  Waited.  Booted up pc.

PC has a Broadcom 10/100 ethernet network adapter.

There is no router/wifi connected at this time.  There normally is, with the modem connected to the router's ethernet WAN port, and a LAN port from the router connected (via ethernet) to the pc's ethernet port.

Here's status page of modem:

Status

 

 RF Parameters

Downstream

  DCID Freq Power SNR Modulation Octets Correcteds Uncorrectables
Downstream 1 20 483.00 MHz -2.66 dBmV 37.94 dB 256QAM 1064867 21 0
Downstream 2 19 477.00 MHz -2.25 dBmV 37.94 dB 256QAM 1200704 24 0
Downstream 3 21 489.00 MHz -2.78 dBmV 38.26 dB 256QAM 1225987 5 0
Downstream 4 22 495.00 MHz -2.86 dBmV 38.26 dB 256QAM 1233571 0 0
Downstream 5 23 507.00 MHz -3.27 dBmV 38.26 dB 256QAM 1151251 0 0
Downstream 6 24 513.00 MHz -3.38 dBmV 38.98 dB 256QAM 552872 0 0
Downstream 7 25 519.00 MHz -3.65 dBmV 39.40 dB 256QAM 1327096 0 0
Downstream 8 26 525.00 MHz -3.79 dBmV 38.26 dB 256QAM 1156142 0 0
Reset FEC Counters

Upstream

  UCID Freq Power Channel Type Symbol Rate Modulation
Upstream 1 1 17.30 MHz 38.25 dBmV DOCSIS2.0 (ATDMA) 5120 kSym/s 64QAM
Upstream 2 4 36.70 MHz 40.25 dBmV DOCSIS2.0 (ATDMA) 5120 kSym/s 64QAM
Upstream 3 3 30.30 MHz 39.50 dBmV DOCSIS2.0 (ATDMA) 5120 kSym/s 64QAM
Upstream 4 2 23.70 MHz 39.00 dBmV DOCSIS2.0 (ATDMA) 5120 kSym/s 64QAM

 Status
System Uptime: 0 d: 0 h: 10 m
Computers Detected: staticCPE(0), dynamicCPE(1)
CM Status: OPERATIONAL
Time and Date: Fri 2019-09-20 12:28:08

 Interface Parameters
Interface Name Provisioned State Speed (Mbps) MAC address
LAN Enabled Up 1000(Full) 00:1D1:FE:23:24
CABLE Enabled Up ----- 00:1D1:FE:23:25

 

 
Expert

Re: Internet Speeds ?

The stats are o/k. If that PC has only a 10/100 port, then that is a limiting factor. You'll need an adapter that has a 10/100/1000 LAN port.



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Regular Contributor

Re: Internet Speeds ?


@EG wrote:

The stats are o/k. If that PC has only a 10/100 port, then that is a limiting factor. You'll need an adapter that has a 10/100/1000 LAN port.


Oh.  I thought a 100 port would accommodate more than 75 down.  I'll have to see if this Dell Studio XPS 8100 i5 3.20 GHz, Windows 7 will accept a faster LAN port.

In the meantime, I'm going to test the modem's speed with a more modern laptop that has a 10/100/1000 port.   I'm curious now.

Thank you.

Expert

Re: Internet Speeds ?

Quite welcome ! With a 10/100 port, you get about 80 to 90 due to the inherent ethernet overhead.



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Regular Contributor

Re: Internet Speeds ?


@EG wrote:

Quite welcome ! With a 10/100 port, you get about 80 to 90 due to the inherent ethernet overhead.


Oops.  I made a big mistake in reporting that I had only a 10/100 MB ethernet port.

Device Manager, Balarc Advisor, and Speccy all show a Broadcom NetLink (TM) Gigabit Ethernet.

 

My setup manual says

The setup guide (page 34) for the Studio XPS 8100 says it has a 10/100/1000 network adapter on the motherboard. Check the LEDs next to the network connector on rear of PC:

  • Green —  A good connection exists between a 10/100‑Mbps network and the computer
  • Amber — A good connection exists between a 1000‑Mbps network and the computer
  • NOTE: The link integrity light on the network connector is only for the wired cable connection. The link integrity light does not provide status for wireless connections.

So, it looks like I have gigabit capabilities, but since the Comcast network I have is only rated at 175 MB for my subscription, only the green 'network connected' light is on. Now, the question again is why do I only get 75 MB when I do a speed test.

Sorry about the error.