【閒聊】南桃園光速通訊寬頻

[microsome]

最初由 iceswater 發表
南桃園LSC使用至今也快屆滿一年了
也來說說用到目前為止的感想吧
當初來PCZONE收集一些LSC的相關訊息時
大部分的人都傾向於不建議申裝
無預警斷線、玩GAME會lag暴ping、到了晚上連線速率接近龜速
但是為了擺脫黑Net的荼毒，我還是決定賭賭看了
為什麼說是賭呢，因為比起看電視還不如上網
而且大部分的電視節目都沒什麼營養不如不看
但是裝機除了600元的網路費
還有安裝費、保證金、和3個月第四台收視費用
這些加一加就差不多4千多元，最後還是忍痛申請了
完工之後，感覺用起來並沒有想像中的那麼差
不過的確是會斷訊，但是只是偶爾，印象中到目前為止只有5、6次吧
斷訊時間大約都有4到12個小時之間，算是滿久的
可惜我臉皮薄不夠澳客，連一通電話也沒打
然後到了晚上情況真的就比較慘了，真的是用龜速來形容也不為過
但是白天沒有什麼問題就算了
大約今年年初左右吧，晚上的速度也能維持一定
一直用到現在都沒出啥大問題了
難道是漲價之後有錢建設網路了？
不過最近TP真的是用的太凶了，網頁要開個好幾次實在很...

我中原的家用起來就沒你幸運，每個月沒給你幾次斷訊你還真覺得奇蹟耶，
晚上PING IP 沒送幾個TIME OUT該放鞭炮，之前因為這個害我玩ONLINE GAME
一質狂死，現在已經脫離LSC滿久不知改善如何。線再對ADSL還是很滿意。

[raytracy]

最初由 iceswater 發表
Packets: Sent = 1000, Received = 676, Lost = 324 (32% loss),
Packets: Sent = 1000, Received = 612, Lost = 388 (38% loss),
Packets: Sent = 1000, Received = 709, Lost = 291 (29% loss),

您的封包遺失狀況很嚴重, 由於response time 並不差, 所以應該不是客戶數太多的問題, 也應該不是電腦本身的問題. 看起來像是實體線路的品質問題. 如果您可以用 docsdiag 看一下訊號值, 或許大家可以再幫您研究看看....

[iceswater]

剛剛再測了一次

Ping statistics for 172.16.1.69:
Packets: Sent = 1000, Received = 766, Lost = 234 (23% loss),
Approximate round trip times in milli-seconds:
Minimum = 12ms, Maximum = 96ms, Average = 21ms

System up time = 0 days 00h 21m 49.00s
IP address.10.2.16.168 = 10.2.16.168
IP address.127.0.0.1 = 127.0.0.1
IP address.192.168.100.1 = 192.168.100.1
Ethernet single-collision errs.1 = 320
Ethernet multiple-collision errs.1 = 160
Ethernet deferred xmits.1 = 12
Downstream channel ID = 11
Downstream channel frequency = 681000000 Hz
Downstream received signal power = -2.2 dBmV
Upstream channel ID = 4
Upstream channel frequency = 26250000 Hz
Upstream timing offset = 5125 units of (6.25/64) microseconds
QoS max upstream bandwidth = 384000 bps
QoS max downstream bandwidth = 2000000 bps
SigQu: received without error = 41303751 codewords
SigQu: correctable errors = 0 codewords
SigQu: uncorrectable errors = 0 codewords
SigQu: Signal to Noise Ratio = 37.7 dB
SigQu: microreflections = 33 dBc
Cable modem status = Operational
Upstream transmit signal power = 38.0 dBmV
Number of interface resets = 0
Downstream sync losses = 0
Invalid MAP msgs received = 0
Invalid UCD msgs received = 0
Invalid Ranging Responses rcvd = 0
Invalid Registration Resps rcvd = 0
T1 timer expiries = 0
T2 timer expiries = 0
T3 timer expiries = 12
T4 timer expiries = 0
Ranging Aborts = 0
Tx mini-slots used (contended).7456 = 0
Tx mini-slots used (dedicated).7456 = 151729
Tx data re-tries.7456 = 0
Tx data retry limit exceeded.7456 = 0
Tx bandwidth req retries.7456 = 2112
Tx bw req retry lim exceeded.7456 = 0
Date and Time = 2004-07-02,14:16:12.0
Configuration filename = Moto51D1500U384C1Upgrade.cfg

[raytracy]

最初由 iceswater 發表
剛剛再測了一次
Packets: Sent = 1000, Received = 766, Lost = 234 (23% loss),

這個狀況真是很糟糕, 不過很奇怪的:

System up time = 0 days 00h 21m 49.00s
Ethernet single-collision errs.1 = 320
Ethernet multiple-collision errs.1 = 160
Ethernet deferred xmits.1 = 12
Downstream received signal power = -2.2 dBmV
SigQu: received without error = 41303751 codewords
SigQu: correctable errors = 0 codewords
SigQu: uncorrectable errors = 0 codewords
SigQu: Signal to Noise Ratio = 37.7 dB
SigQu: microreflections = 33 dBc
Upstream transmit signal power = 38.0 dBmV
T1 timer expiries = 0
T2 timer expiries = 0
T3 timer expiries = 12

您的實體訊號看起來都還不錯, 只是有幾次 T3 Timeout, 但從信號值上判斷不出關聯性. 頂多是 microreflections 高了一些 (通常應該 10 幾比較好, 不過這是台灣 Cable 業者普遍的問題)

但是 CM 才開機 21 分鐘, 竟然可以出現好幾百次的 Ethernet Error? 好像您的 PC 與 CM 之間的溝通有些問題....您有沒有試過換網路卡或網路線? 或是將網路卡的多工設定從 Auto 改成 Half-duplex 或 Full-duplex 試試看? 或是在中間插個分享器進去試看看?

[iceswater]

感謝raytracy兄的熱心回應
把Realtek RTL8029換成Intel PRO/100 VE
網路線也一併換過
快速測了一下

Ping statistics for 172.16.1.69:
Packets: Sent = 140, Received = 116, Lost = 24 (17% loss),
Approximate round trip times in milli-seconds:
Minimum = 11ms, Maximum = 52ms, Average = 22ms

System up time = 0 days 00h 05m 38.00s
IP address.10.2.16.168 = 10.2.16.168
IP address.127.0.0.1 = 127.0.0.1
IP address.192.168.100.1 = 192.168.100.1
Ethernet carrier sense xmit errs.1 = 158
Downstream channel ID = 11
Downstream channel frequency = 681000000 Hz
Downstream received signal power = -1.6 dBmV
Upstream channel ID = 4
Upstream channel frequency = 26250000 Hz
Upstream timing offset = 5124 units of (6.25/64) microseconds
QoS max upstream bandwidth = 384000 bps
QoS max downstream bandwidth = 2000000 bps
SigQu: received without error = 10655694 codewords
SigQu: correctable errors = 0 codewords
SigQu: uncorrectable errors = 0 codewords
SigQu: Signal to Noise Ratio = 37.6 dB
SigQu: microreflections = 40 dBc
Cable modem status = Operational
Upstream transmit signal power = 37.8 dBmV
Number of interface resets = 0
Downstream sync losses = 0
Invalid MAP msgs received = 0
Invalid UCD msgs received = 0
Invalid Ranging Responses rcvd = 0
Invalid Registration Resps rcvd = 0
T1 timer expiries = 0
T2 timer expiries = 0
T3 timer expiries = 1
T4 timer expiries = 0
Ranging Aborts = 0
Tx mini-slots used (contended).7650 = 0
Tx mini-slots used (dedicated).7650 = 12232
Tx data re-tries.7650 = 0
Tx data retry limit exceeded.7650 = 0
Tx bandwidth req retries.7650 = 84
Tx bw req retry lim exceeded.7650 = 0
Date and Time = 2004-07-02,15:28:19.0
Configuration filename = Moto51D1500U384C1Upgrade.cfg

[raytracy]

最初由 iceswater 發表
感謝raytracy兄的熱心回應
把Realtek RTL8029換成Intel PRO/100 VE
Packets: Sent = 140, Received = 116, Lost = 24 (17% loss),
System up time = 0 days 00h 05m 38.00s
Ethernet carrier sense xmit errs.1 = 158
Downstream received signal power = -1.6 dBmV
SigQu: received without error = 10655694 codewords
SigQu: correctable errors = 0 codewords
SigQu: uncorrectable errors = 0 codewords
SigQu: Signal to Noise Ratio = 37.6 dB
SigQu: microreflections = 40 dBc
Upstream transmit signal power = 37.8 dBmV
T1 timer expiries = 0
T2 timer expiries = 0
T3 timer expiries = 1
T4 timer expiries = 0

還是一樣, CM 實體的訊號很好, 但是 Ethernet 短時間就出現一堆 Error. 雖然比先前好一點, 但小弟認為, 您的 CM Ethernet 介面有些狀況, 可能與 PC 網卡之間無法調適. 請試著改變網卡的這個參數: (假設是 XP)

我的電腦 -> 按右鍵選內容 -> 硬體 -> 裝置管理員 -> 網路介面卡 -> (Realtek or Intel) -> 按右鍵選內容 -> 進階

現在應該會出現網卡的進階設定畫面, 請您找一下左邊的選項中, 有沒有一個 Link Speed & Duplex 的選項, 點下去右邊的數值欄會出現 Auto 字樣? 若有的話, 請把 Auto 改掉試試看. 可以先從 10Mbps/Half Duplex 試看看, 找出一個 Error 比較少的設定.

如果有機會的話, 換一條網路線也可試試看. 或是將現有的網路線兩端對調過來接看看.....

[iceswater]

raytracy兄；
根據您的說法，小弟我照著實做一番
發現Error真的變少了
但是網路還是一樣慢到不行
連開個pczone的網頁都要好幾十秒
而且還沒開其他跟網路有關的軟體...

Ping statistics for 172.16.1.69:
Packets: Sent = 1000, Received = 753, Lost = 247 (24% loss),
Approximate round trip times in milli-seconds:
Minimum = 12ms, Maximum = 315ms, Average = 21ms

System up time = 0 days 00h 33m 56.00s
Ethernet alignment errors.1 = 1
Ethernet single-collision errs.1 = 3
Ethernet deferred xmits.1 = 8
Ethernet late collisions.1 = 1
Downstream channel ID = 11
Downstream channel frequency = 681000000 Hz
Downstream received signal power = -2.0 dBmV
Upstream channel ID = 4
Upstream channel frequency = 26250000 Hz
Upstream timing offset = 5120 units of (6.25/64) microseconds
QoS max upstream bandwidth = 384000 bps
QoS max downstream bandwidth = 2000000 bps
SigQu: received without error = 64286594 codewords
SigQu: correctable errors = 0 codewords
SigQu: uncorrectable errors = 0 codewords
SigQu: Signal to Noise Ratio = 37.3 dB
SigQu: microreflections = 40 dBc
Cable modem status = Operational
Upstream transmit signal power = 37.8 dBmV
T1 timer expiries = 0
T2 timer expiries = 0
T3 timer expiries = 4
T4 timer expiries = 0
Ranging Aborts = 0
Tx mini-slots used (contended).1233 = 0
Tx mini-slots used (dedicated).1233 = 131290
Tx data re-tries.1233 = 0
Tx data retry limit exceeded.1233 = 0
Tx bandwidth req retries.1233 = 1744
Tx bw req retry lim exceeded.1233 = 0
Date and Time = 2004-07-02,20:11:55.0
Configuration filename = Moto51D1500U384C1Upgrade.cfg

[mmshu]

可否也請Raytracy 版大幫小弟看一下這個訊號是否正常...
小弟使用南桃園光速...最進真的慢到不行....

以下是用Docsdiag抓出的訊號

<<HW_REV: 3; VENDOR: Motorola Corporation; BOOTR: 2150; SW_REV: SB5100-2.3.1.6-S
CM01-NOSH; MODEL: SB5100>>

System up time = 4 days 19h 41m 51.00s
Downstream channel ID = 11
Downstream channel frequency = 681000000 Hz
Downstream received signal power = -5.8 dBmV
Upstream channel ID = 3
Upstream channel frequency = 33150000 Hz
QoS max upstream bandwidth = 384000 bps
QoS max downstream bandwidth = 2000000 bps
SigQu: Signal to Noise Ratio = 39.6 dB
Cable modem status = Operational
Upstream transmit signal power = 49.0 dBmV
Date and Time = 2004-07-03,15:29:40.0
Configuration filename = Moto51D1500U384C1Upgrade.cfg

不知是否有不正常的地方
http://home.pchome.com.tw/mysite/mmshu/Speed_Test.JPG

[raytracy]

最初由 mmshu 發表
可否也請Raytracy 版大幫小弟看一下這個訊號是否正常...

這樣看不太出來, 可否請您加上 -v 的參數再讀一次?....

[raytracy]

最初由 iceswater 發表
raytracy兄；
根據您的說法，小弟我照著實做一番
發現Error真的變少了
但是網路還是一樣慢到不行

好, PC <-> CM 之間的問題解決了; 現在剩下比較可疑的, 就是 microreflections 的數值了. 而且現在又增加了許多! 看起來好像會跑來跑去, 通常不應該會這樣的. 這個數值所代表的, 是實體電路上的反射訊號大小, 理應越小越好. 現在有幾種可能:

1. 整條實體電路上出現阻抗不匹配的狀況, 但這很難查, 國內好像還沒聽說有哪家業者, 有能力去測量或監控這個問題.

2. 有新的私接戶出現在同一條電路上. 私接戶施工的品質一定遠低於業者, 只要接頭沒做好, 也有可能出現此問題. 或是私接戶使用的分配器, 放大器, 甚至電視太老舊, 也可能造成此現象. (因為沒有接高通濾波器, 所以無法阻止私接戶家中電器的不良特性反灌回來)

3. 業者本身的電路上, 有某些接頭沒有處理好. 外觀看起來可能是好的, 但裡面有問題. 例如, 接頭外面包覆的防水熱縮套管, 如果長度不足, 很可能因為日曬雨淋, 造成龜裂, 而滲雨水進去. 平時訊號看起來很好, 但水氣干擾時, 若長時間測試, 就會出現問題. 此外, 若熱縮套管使用其他廠牌, 不是用 3M 出產的, 也有可能會這樣.

您的問題必須報修, 請業者來查電路. 但小弟並不很樂觀, 因為上面有些因素是超出業者掌握的範圍之外. 您只要抓住一個重點: 用 ping 測試的結果要求業者改善(必要時, 搬出電總的法規來講), 其他問題讓業者自己去傷腦筋. 若一直無法改善, 您可以先要求費用上折扣優待, 以給業者壓力去面對此問題. (to: coolbrother兄, 對不起喔, 您可要辛苦囉...)