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GH4STLY

join:2012-11-03
Apex, NC

Are my specifications for my modem on the up and up

I was helping someone out recently, and well, I don't remember quite a bit about what I taught in class regarding power and signal to noise ratio. If I remember right the higher the SnR ratio is, the better.

I am also asking for two reasons. In part, due to a recent happening, of being disconnected from my ISP (Time Warner Cable) randomly. All the lights on the modem were still connected, Router still had an IP, DNS was working fine (run my own DNS server). Unfortunately, I forgot to look up the IP to the modem before power cycling it (which fixed the problem), but was just wondering in case. Second, because I noticed that when using the throughput intensely, I can never achieve over a 1 MB downstream (95% of the time), however when doing speedtests, or berkley's network analyzer they all say that my speed is greater than 15 - 20 mb/s.

Appreciate any answers. Logs and information from modem below.

 
RF Parameters
Downstream
 Freq/Power: 609.000 MHz -6 dBmV  
 Signal to Noise Ratio:  37 dB  
 Modulation:QAM256 
Upstream
 Freq/Power:34.600 MHz 37 dBmV  
  Channel Type: DOCSIS 1.x (TDMA) 
  Symbol Rate: 2560 kSym/sec 
  Modulation: QAM16 
 
DOCSIS(CM) Events
Date Time Event ID Event Level Description
***** 17000100 3 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
***** 17000400 3 SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
***** 17000100 3 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
***** 20000200 3 No Ranging Response received - T3 time-out
7/22/2012 5:14 20000400 3 Received Response to Broadcast Maintenance Request, but no Unicast Maintenance opportunities received - T4 timeout
7/22/2012 5:14 14020600 3 DCC aborted unable to communicate on new upstream channel
7/22/2012 8:52 20000400 3 Received Response to Broadcast Maintenance Request, but no Unicast Maintenance opportunities received - T4 timeout
7/22/2012 8:52 14020600 3 DCC aborted unable to communicate on new upstream channel
7/22/2012 8:52 20000200 3 No Ranging Response received - T3 time-out
***** 20000400 3 Received Response to Broadcast Maintenance Request, but no Unicast Maintenance opportunities received - T4 timeout
7/22/2012 9:04 14020600 3 DCC aborted unable to communicate on new upstream channel
***** 20000200 3 No Ranging Response received - T3 time-out
***** 20000500 3 Started Unicast Maintenance Ranging - No Response received - T3 time-out
***** 20000200 3 No Ranging Response received - T3 time-out
***** 20000500 3 Started Unicast Maintenance Ranging - No Response received - T3 time-out
10/22/2012 0:11 20000400 3 Received Response to Broadcast Maintenance Request, but no Unicast Maintenance opportunities received - T4 timeout
10/22/2012 0:11 14020600 3 DCC aborted unable to communicate on new upstream channel
***** 20000200 3 No Ranging Response received - T3 time-out
***** 13000300 5 DHCP WARNING - Non-critical field invalid in response
11/3/2012 18:14 1040100 6 TLV-11 - unrecognized OID
 
 PACKETCABLE(MTA) Events
Date Time Event Level Enterprise Event ID Description MAC Address Endpoint Name
1/1/1970 0:00 5 4115 7 Voice Line Loop Current Change to High, Line Number = 1 00:1D:CD:9F:B7:AB AALN/1:/0.0.0.0
1/1/1970 0:00 5 4115 7 Voice Line Loop Current Change to High, Line Number = 2 00:1D:CD:9F:B7:AB AALN/2:/0.0.0.0
11/3/2012 18:14 5 4115 16 MTA TFTP: Successful 00:1D:CD:9F:B7:AB x1-6-00-1d-cd-9f-b7-ab.ddns.nc.rr.com/65.190.108.233
11/3/2012 18:14 5 4115 3 Voice Line State Change, Line Number = 1, Prev State = OOS, New State = IS 00:1D:CD:9F:B7:AB AALN/1:x1-6-00-1d-cd-9f-b7-ab.ddns.nc.rr.com/65.190.108.233
11/3/2012 18:14 3 4115 14 Power Supply Telemetry Log - BATTERY MISSING 00:1D:CD:9F:B7:AB x1-6-00-1d-cd-9f-b7-ab.ddns.nc.rr.com/65.190.108.233
11/3/2012 18:14 5 4115 26 MTA PROV: Successful! 00:1D:CD:9F:B7:AB x1-6-00-1d-cd-9f-b7-ab.ddns.nc.rr.com/65.190.108.233
11/3/2012 18:14 3 4115 14 Power Supply Telemetry Log - TELEMETRY NORMAL 00:1D:CD:9F:B7:AB x1-6-00-1d-cd-9f-b7-ab.ddns.nc.rr.com/65.190.108.233
11/3/2012 18:47 3 4115 14 Power Supply Telemetry Log - BATTERY TEST IN PROGRESS 00:1D:CD:9F:B7:AB x1-6-00-1d-cd-9f-b7-ab.ddns.nc.rr.com/65.190.108.233
 


hobgoblin
Sortof Agoblin
Premium
join:2001-11-25
Orchard Park, NY
kudos:11
It all looks good to me.

Hob

GH4STLY

join:2012-11-03
Apex, NC

1 edit
This is why I ask:

Berkeley Network Analyzer Results:
»n3.netalyzr.icsi.berkeley.edu/re···-a70b/rd
quote:
Network latency measurements (?): Latency: 20ms Loss: 4.0% –
The round-trip time (RTT) between your computer and our server is 20 msec, which is good.
We recorded a packet loss of 4.0%. This loss rate can result in noticeable performance problems. It could be due either to significant load on our servers due to a large number of visitors, or problems with your network. Of the packet loss, at least 4.0% of the packets appear to have been lost on the path from your computer to our servers.
TCP connection setup latency (?): 25ms +
Network background health measurement (?): no transient outages +
Network bandwidth (?): Upload 1.8 Mbit/sec, Download 15 Mbit/sec +
Network buffer measurements (?): Uplink 610 ms, Downlink 830 ms –
We estimate your uplink as having 610 msec of buffering. This level can in some situations prove somewhat high, and you may experience degraded performance when performing interactive tasks such as web-surfing while simultaneously conducting large uploads. Real-time applications, such as games or audio chat, may also work poorly when conducting large uploads at the same time.
We estimate your downlink as having 830 msec of buffering. This level can in some situations prove somewhat high, and you may experience degraded performance when performing interactive tasks such as web-surfing while simultaneously conducting large downloads. Real-time applications, such as games or audio chat, may also work poorly when conducting large downloads at the same time.

»myspeed.visualware.com/index.php results:
Speed test statistics
--------------------
Download speed: 16764 kbps
Upload speed: 1797 kbps
Download consistency of service: 79 %
Upload consistency of service: 87 %
Download test type: socket
Upload test type: socket
Maximum TCP delay: 31 ms
Average download pause: 1 ms
Minimum round trip time to server: 27 ms
Average round trip time to server: 30 ms
Estimated download bandwidth: 39200 kbps
Route concurrency: 2.3383105
Download TCP forced idle: 56 %
Maximum route speed: 19417 kbps
 
General Information
-------------------
IP Address: 65.190.202.4
Local time: Nov 3, 2012 10:14:49 PM
Test server: http://voiptest.carolinadigitalphone.com/
 

Pingtest and speedtest look okay:
»www.pingtest.net/result/71727799.png
»speedtest.net/result/2284508003.png

I noticed this fluctuates quite a bit, all of the information does. Unfortunately the speed and ping tests are okay, but the two other results telling me that my connection for skype and what not might have degraded or not-optimum performance is what makes me wonder if I can do anything better, or something could be tweaked to gain better performance.

I don't know what level of throughput we pay for, but if TWC offers 20/2 I believe that is what it is. If not, then I am unsure. QoS is enabled with my router, however, I tend to see better results with QoS disabled for some reason.

I am currently running a N66U router with dd-wrt on it. 64KB CFE, build 20202.

QoS settings:
Packet Scheduler HTB
Uplink 1900
Downlink 18000

http Standard
HTTP(S) Standard
RealVNC Express
RealVNCJ Express
SSH/FTP Standard
Torrent Bulk
Skype Premium

TCP Congestion Control is set to cubic