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sparkybp01
@teksavvy.com

sparkybp01 to Teddy Boom

Anon

to Teddy Boom

Re: [Cable] Incompatible Cable Modem

ID 0 1 2 3
Downstream Frequency 614.998535 MHz 620.999756 MHz 632.997681 MHz 638.999023 MHz
Lock Status Locked Locked Locked Locked
Modulation 256 QAM 256 QAM 256 QAM 256 QAM
Symbol Rate 5.360537Msym/sec 5.360537Msym/sec 5.360537Msym/sec 5.360537Msym/sec
Downstream Power -2.576499 dBmV -1.917745 dBmV -2.541628 dBmV -3.098556 dBmV
SNR 35.595078 dB 35.595078 dB 35.595078 dB 35.417789 dB
Upstream Channel
ID 0 1 2 3
Upstream Frequency 25296000 Hz 31296000 Hz 22096000 Hz 38596000 Hz
Lock Status Locked Locked Locked Locked
Modulation 16QAM 16QAM 16QAM 16QAM
Symbol Rate 2560 sym/sec 2560 sym/sec 2560 sym/sec 2560 sym/sec
Upstream Power 49.0000 dBmV 50.0000 dBmV 48.5000 dBmV 50.5000 dBmV
Channel ID 2 1 3 4

Where are you located in case I decide to bring it by for a flash, its really starting to piss me off!

Crowbar10
join:2009-06-23
Toronto , ON

Crowbar10

Member

said by sparkybp01 :

Where are you located in case I decide to bring it by for a flash, its really starting to piss me off!

You probably missed the part where he stated 'Changing the firmware probably won't make any technical difference to the quality of your connection.'

Teddy Boom
k kudos Received
Premium Member
join:2007-01-29
Toronto, ON

Teddy Boom to sparkybp01

Premium Member

to sparkybp01
Click through to my website and then email me.
(electronicsguru.ca -- don't know why my signature is missing..)

sbrook
Mod
join:2001-12-14
Ottawa

sbrook

Mod

sparky ... your upstream power is probably marginal at 50dBmV on two of the channels. I don't know if this modem is like some models, but if the spread in the power levels between channels is too high (typically about 1 dB) they'll try a new connection.

Teddy Boom
k kudos Received
Premium Member
join:2007-01-29
Toronto, ON

Teddy Boom

Premium Member

said by sbrook:

sparky ... your upstream power is probably marginal at 50dBmV on two of the channels. I don't know if this modem is like some models, but if the spread in the power levels between channels is too high (typically about 1 dB) they'll try a new connection.

Ya, I noticed when I first read his post, but then failed to reply to it..... While the spec for upstream power is something like 52dBmV, in practice 50dBmV is marginal and concerning.

However, if the issue is truly signal level, sparky needs a supported modem before anybody will come and fix it.
(Maybe that's why I didn't mention about the signal levels!?!? :P)

sbrook
Mod
join:2001-12-14
Ottawa

sbrook

Mod

Considering it's a Rogers modem, it's quite the pain that Rogers won't support their own modems when used by a TPIA!

Teddy Boom
k kudos Received
Premium Member
join:2007-01-29
Toronto, ON

Teddy Boom

Premium Member

said by sbrook:

Considering it's a Rogers modem, it's quite the pain that Rogers won't support their own modems when used by a TPIA!

Which reminds me of something I intended to start a thread on, but posting it here is just as good.

I just "upgraded" an SMCD3GN from Rogers provided 3.1.4.45.2 to the supported 1.4.0.40. The customer called back a couple of days later and said that he now has a stable connection. I didn't think that would be possible, but it appears to be the case...

sbrook
Mod
join:2001-12-14
Ottawa

sbrook

Mod

Was it the SMC modem that got bent out of shape when the signal levels between downstream bonded channels signal levels differed by more than 1 dB? If that was the case, perhaps the firmware loosened that requirement a bit!?

Teddy Boom
k kudos Received
Premium Member
join:2007-01-29
Toronto, ON

Teddy Boom

Premium Member

Ya, I don't know about that so much, though I do recall it being discussed. What I meant above is that in my experience upstream power levels >=50dBmV are already marginal for upstream bonding..

The strange thing about the firmware change is that I dialed it way back, like 1.4.0.40 must be 2 years older than the 3.1.x.x one, and the 3.1.x.x one is provided by Rogers for use by Rogers customers. I'm pretty surprised that it made any difference at all.