SB6180 Connect Screen Approx 10:30
SB6180 Connect Screen Approx 11:30
Based on the information provided »Cox HSI Forum FAQ
»What should my modem signal levels be?
I am within the parameters for Cox HSI; so why are my uncorrectables in the the hundreds of thousands in 2 days?
My COX HSI Service is:
Premier 28mbps/5mbps (+7mbps SPEEDBOOST) and Premier Phone Service.
HSI Motorola SB6180 and Phone ArrisTM502, Router is Mikrotik RB751U-2HnD ROS v5.15
(phone works every time I call for help, just fyi)
When at my 4656 address, the Cox Service was stellar using doc sys 1 SB modem, and Mikrotik ROS v4.17 and Arris Phone modem. I had phone, internet and TV. It was wonderful for a year straight. Called Cox for changes to service and once after a storm. We moved at the end of our lease to 111 address. The nightmare began that March and continued into the late fall. We had to change to Directv do to pixelation and loss of picture. Over the winter months, everything worked fine after buying several different routers. Linksys(Cisco), DLink, Mikrotik and being given a Motorola SB6120. In February the weather was unseasonably warm and KAPOW, all the issues (issues will be listed below) started all over.
After about 3+ truck rolls and visits we were able to function providing we did the following:
Downstream - Channels (4) If any of the dBmV's went above 3 or -3 then all new internet requests would fail. Skype voice would be choppy and video would DC. Webpages would at best partially load and mostly text only.
UpStream - Channel (1) If it reached 50 dBmV then Webpages would time out and server not responding and uploads to college platform would fail. Skype would not function and gaming would be extremely laggy and ventrilo would hit 7000ms or higher latency.
The fix to this was a simple two way splitter than could move the signal levels back to a 0 dBmV on the downstream and to 47dBmV on the Upstream. This would need to be done only once a week at first then moved to 2-3 times a day.
On the Monday last week the 21st of May, if you can believe it everything got worse, much, much worse. Trucks rolled in, 3 to be exact. Please understand that my calls to Cox Technical support required these trucks to roll regardless of the information I was trying to provide them on the call. I have offered to all the Support Personnel when I call, including "supervisors" the log screen shots of my modem logs so they can see the errors.
These errors include some of the following:
SYNC Timing Synch failure - Loss of sync
Lost MDD Timeout
Cable Modem Reboot due to MDD Loss
TLV-11 Unrecognized OID (this one is after any power up of modem)
No Ranging Response received - T3 time-out
TFTP File Complete - but missing mandatory TLV
ToD request sent - No Response received
TFTP Request Retries exceeded, CM unable to register (this one always requires us to reboot the modem and pray to a higher power)
I am not genius, but I am fairly certain that with the Main line showing an inverted tilt (possibly reverse tilt), and with problems browsing when in the "acceptable signal level range" that there must be a bigger problem.
My experience with DOCSiS1 has most Cable Services with similar signal parameters of:
Downstream @ +7 to -7 dBmV
with SNR @ 36+
Upstream @ 43-51 dBmV
My current levels as of this initial posting are:
Acquire Downstream Channel (807000000Hz) Locked
Downstream @ (807000000 Hz) 2.0dBmV and SNR39.6
Upstream @ (36000000 Hz) 44 dBmV
-Downstream by Channel-
Chan 1 (807000000 Hz) 1.9 dBmV SNR 39.3
- correctables 458270, uncorrectables 92364
Chan 2 (813000000 Hz) 2.0 dBmV and SNR 39.9
- correctables 5, uncorrectables 0
Chan 3 (819000000 Hz) 1.9 dBmV and SNR 40.0
- correctables 11, uncorrectables 2
Chan 4 (825000000 Hz) 1.6 dBmV and SNR 39.8
- correctables 21, uncorrectables 2
Chan 2 (831000000 Hz) 1.3 dBmV and SNR 39.9
- correctables 10, uncorrectables 7
-Upstream by Channel-
Chan 1 (36000000Hz) 2560 Ksym/sec 44.0 dBmV
Speed tests prior to the 21st of may done on the cox.net site Kansas server.
Pings 37 to 66 ms
34-66Mbps/6-8Mbps depending on the signal levels. If they were at 0 DS and 46 US then 100+Mbps spike averaging to the 60's happened, if at the +/-3 or 50 then if it worked in the 30/6.
After the 21st (You are configured correctly and it is working as intended), I can no longer fix any issues myself by adding or removing the splitter. the following are the Cox.net site speed test results.
12-41 Mbps/7-8Mbps if you can get it to work. Times out with a download only of 2-3 Mbps / no data and ping 90 but doesn't save the data in the log. Actually, only about 2 in 5 tests show up on the log. Have screen shots of all this if anyone wants them.
I am certain the uncorrectable being 1/4 of the correctable; and the correctable being in the hundreds of thousands is definitely not in the acceptable parameter range.
So what is my next step?
I power cycled the modem and router properly 5-27 @ 10:15AM and in just 1 hour and 30 minutes I am at almost 10000 correctable and 2300 uncorrectable on channel 1. The screenshots are at the top of this post.