getting service - but something's not right

Have a question or want to start a discussion? Post it! No Registration Necessary.  Now with pictures!

Threaded View


My ISP is Comcast, in the middle Tennessee area.


Some time ago I began to get sporadic connections -- would not be able
to get to the internet for a couple of hours, then could.  Finally got
a service tech to come out.  He first said the cable modem had gone
bad, and replaced it.  But the new one 'won't synch up', so he went
through a couple of more, then decided it must be the line.  Put a
test instrument on it, and said the signal was "too hot."  Called
another tech out to go up the pole.  They futzed around some more, an
finally said they'd come back the next morning. (This was getting into
the evening on Friday, and they were way over on their shift.)

Well, as you can guess, they never came back.  I've not had any
service interruptions since, BUT ......  ever since that visit, the
'data' LED on the modem is consantly flashing at a very high rate.
Even when the computer is turned off. (This is a Teradyne modem, with
the LED's labeld 'Power', 'Cable', 'PC', 'Data', and 'Test'.   I'm
presuming the Power, Cable, and PC are exactly what one would expect,
and the Data and Test are really Send and Receive.

I've not called Comcast, because I *DO* have service, but it still
seems that something "just ain't right."

Thoughts?

Re: getting service - but something's not right


On Sun, 19 Feb 2006 15:53:15 -0600, Ed Stevens

Quoted text here. Click to load it
It's normal "background " cable activity. Can't explain any better.
Mine goes nuts also.

Re: getting service - but something's not right


Quoted text here. Click to load it

It's called Address Resolution Protocol, or "ARP", and it's how the
network associates hardware, which only has a MAC address, with the IP
addresses handed out by the cable co's DHCP server, and yes, it's very
normal, and means things are actually working...

--Gene

Re: getting service - but something's not right


Gene S. Berkowitz wrote:
Quoted text here. Click to load it
It is also the various internet bots, viruses, etc... walking the IP
addresses pissibilities looking for unpatched systems to infect. Which
is why you always run a router these days.


Re: getting service - but something's not right


Gene S. Berkowitz wrote:
 >>> My ISP is Comcast, in the middle Tennessee area.
 >>> Some time ago I began to get sporadic connections -- would not be able
 >>> to get to the internet for a couple of hours, then could.  Finally got
 >>> a service tech to come out.  He first said the cable modem had gone
 >>> bad, and replaced it.  But the new one 'won't synch up', so he went
 >>> through a couple of more, then decided it must be the line.  Put a
 >>> test instrument on it, and said the signal was "too hot."  Called
 >>> another tech out to go up the pole.  They futzed around some more, an
 >>> finally said they'd come back the next morning. (This was getting into
 >>> the evening on Friday, and they were way over on their shift.)
 >>>
 >> It's normal "background " cable activity. Can't explain any better.
 >> Mine goes nuts also.
 >
 > It's called Address Resolution Protocol, or "ARP", and it's how the
network associates hardware, which only has a MAC address, with the IP
addresses handed out by the cable co's DHCP server, and yes, it's very
normal, and means things are actually working...
 >
It is also the various internet bots, viruses, etc... walking the IP
addresses possibilities looking for unpatched systems to infect. Which
is why you always run a router these days.

Re: getting service - but something's not right


Can you see the modem levels with that modem?


Quoted text here. Click to load it



Re: getting service - but something's not right


On Sun, 19 Feb 2006 18:11:22 -0500, "Dave"

Quoted text here. Click to load it

No.  When I point my browser to the modem (192.168.100.1) I get a
"main" page and a "troubleshoot" page.  Main shows the following
information:

USB: Not connected
Ethernet: 100 base T Full Duplex
USB Vendor ID: 06 cc
MAC Address: <snip>
CM Model; TJ715x

Cable Signal: Ready
Tuning: Complete
Ranging: Complete
Data Service: Ready
Connecting: Complete
Configuring: Complete
Registering: Complete
Current State: Operational
Highest State Obtained: Operational
Auto Refresh is currently off


And for grins, Troubleshoot give the following:

Dr. Modem has examined your modem
Dr. Modem's Diagnosis:
   - The modem is fully operational

How's that for succinct to the point of being non-informative? :-)

Re: getting service - but something's not right


Ed Stevens wrote:

Quoted text here. Click to load it

Is that a Teradyne (as you mentioned in your first post) or a Terayon modem ?

If it's a Terayon (TJ715 - not sure if TJ715X is the same) you should be
able to go to these pages :

Main        http://192.168.100.1/mainPage
Troubleshoot    http://192.168.100.1/modemTroubleshootPage
Connection    http://192.168.100.1/modemRfPage

Advanced Links : (only available after logging in)

Event Log    http://192.168.100.1/modemLogPage
Status        http://192.168.100.1/modemStatusPage
DS Freq        http://192.168.100.1/modemDsFreqPage
Configuration    http://192.168.100.1/modemConfigPage
Logout        http://192.168.100.1/logout

Try going to the modemLogPage and typing in the password <<<<< icu4at! >>>>>
If it's the same as the TJ715, that should get you in and you can go to the
Connection link and get your numbers.

Re: getting service - but something's not right


wrote:

Quoted text here. Click to load it

DOH!

Yes, Terayon.  

Cool.  I never knew those additional pages were there!   Where does
one find the docs on the modem?

Here's what the RF Parameters page reports:

Tx Power: 42.2 dBmV
Rx Power: -4.9 dBmV
Downstream SNR: 33.0 dB
Downstream MER: 31.9 dB
Tx Frequency: 34000000    Hz
Rx Frequency: 693000000 Hz



Re: getting service - but something's not right


Ed Stevens wrote:

Quoted text here. Click to load it

Not sure there are any besides the LED sheet:

LED        Color        Definition
Power        Green        Dark when power is Off.
                Solid when power is On.
Cable        Green        Dark for no downstream RF carrier present or
                power Off.
                Flashing slowly for downstream RF carrier
                present and ranging in process.
                Flashing fast when registration is in
                process, or if flashing fast continuously,
                network access has been disabled by your cable
                company.
                Solid for modem registration complete and
                ready to transfer data.
PC        Green        Dark when no carrier is present to or from PC,
                or power is Off.
                Solid when carrier is present to or from PC.
Data        Green        Dark when no data is passing through modem or
                power is Off.
                Flashing when data is passing through modem.
Test        Amber        Dark when initial modem self-test is OK, or
                power is Off.
                Flashing when modem self-test is in process,
                or when modem is receiving software updates.
                Solid when modem fails the initial self-test.

Quoted text here. Click to load it

That looks OK - what does your config page look like ?  It should show
your bandwidth and version info.



Re: getting service - but something's not right


:Ed Stevens wrote:
:
:> Here's what the RF Parameters page reports:
:>
:> Tx Power: 42.2 dBmV
:> Rx Power: -4.9 dBmV
:> Downstream SNR: 33.0 dB
:> Downstream MER: 31.9 dB
:> Tx Frequency: 34000000    Hz
:> Rx Frequency: 693000000 Hz
:
:That looks OK - what does your config page look like ?  It should show
:your bandwidth and version info.

That 33.0 dB downstream SNR is right at the minimum recommendation
for 256 QAM modulation.  If the SNR drifts lower you'll likely see
packet loss or even a dropped connection.

    http://www.dslreports.com/faq/5862

--
Bob Nichols         AT comcast.net I am "RNichols42"

Re: getting service - but something's not right


wrote:

Quoted text here. Click to load it

No specific bandwidth stuff ...


PC Connectivity:
USB: Not Connected
Ethernet: 100 BaseT Full Duplex
USB Vendor ID: 06 cc
MAC Address: <snip>
CM Model: TJ715x

Cable Signal: Ready
Tuning: Complete
Ranging: Complete

Data Service: Ready
Connecting: Complete
Configuring: Complete
Registering: Complete

Current state: Operational
Highest State Obtained: Operational


Kind of reminds me of what a co-worker told me many years ago about
the IT shop he worked in prior to the current job.  Mgmt was anal
about hearing "the system is down" -- pretty much forbade the use of
the phrase.  So the programmers put a rubber chicken on a stick.  If
the chicken was "up", it meant the system was up.  So you could tell
the status of the system by looking at the chicken.  Ever since
hearing that story, whenever I see a report (kinda like this page from
the modem!) that summarises to the point of being useless, I think
"So,   the chicken is up."

Re: getting service - but something's not right


Ed Stevens wrote:

Quoted text here. Click to load it


Wron page:  try: modemconfigpage which should give your throttle speeds and such.


Re: getting service - but something's not right


wrote:

Quoted text here. Click to load it

Modem IP    <snip>
Hardware Version    9.0
Software Version    6.25
DOCSIS Version    2.0
Configuration file name    d11_m_tj715_silver_c01.cm
Maximum Downstream Bandwidth    6600000
Maximum Upstream Bandwidth    384000
Maximum Number of CPEs    1

I notice these are "max' bandwidth.  Any way to see 'actual achieved'?

Re: getting service - but something's not right


Ed Stevens wrote:

Quoted text here. Click to load it

That's more than me (Adelphia) on downstream, but the upstream is a bit lower :

Mine: Down: 4823450
      Up:    463051

Quoted text here. Click to load it

You can run one of the many bandwidth testers out there.  Here's two:

http://www.broadbandreports.com/speedtest
http://www.testmy.net /


Re: getting service - but something's not right


wrote:

Quoted text here. Click to load it


Survey Says! .....

dslreports.com speed test result on 2006-02-23 18:49:41 EST:
1236 / 300
Your download speed : 1236 kbps or 154.6 KB/sec.
That is 72.9% worse than avg. other reports from comcast.net

Your upload speed : 300 kbps or 37.6 KB/sec.
That is 23.4% worse than avg. other reports from comcast.net

Gee, and I've had no complaints about speed ...  but this says I
should be getting MUCH more!

Re: getting service - but something's not right


Ed Stevens wrote:

Quoted text here. Click to load it

1) Try running it again (make sure you have the closest server), it
   can vary by time of day and such since local traffic can vary.
   Make sure you don't have anything else running at the same time.

2) Try the 'testmy' one too and see if you get a similar result.


Re: getting service - but something's not right


Hey mine does that and when there is nothing on TV, I sit and watch
that little light for hours.
Quoted text here. Click to load it



Site Timeline