小弟剛接觸cable的網路用了您建議的docsdiag對家中的線路做了一下測試,得到下面的數據
DocsDiag v030720 Copyright 2001-3 Robin Walker [email protected]
<<HW_REV: 3; VENDOR: Motorola Corporation; BOOTR: 2150; SW_REV: SB5100-2.3.1.6-SCM01-NOSH; MODEL: SB5100>>
System up time = 0 days 00h 34m 27.00s
MAC address.1 =
MAC address.2 =
MAC address.5 =
IP address.10.223.10.40 = 10.223.10.40
IP address.127.0.0.1 = 127.0.0.1
IP address.192.168.100.1 = 192.168.100.1
Downstream channel ID = 1
Downstream channel frequency = 573000000 Hz
Downstream received signal power = -13.5 dBmV
Upstream channel ID = 2
Upstream channel frequency = 40000000 Hz
Upstream timing offset = 13259 units of (6.25/64) microseconds
QoS max upstream bandwidth = 128000 bps
QoS max downstream bandwidth = 768000 bps
SigQu: received without error = 65250784 codewords
SigQu: correctable errors = 0 codewords
SigQu: uncorrectable errors = 0 codewords
SigQu: Signal to Noise Ratio = 34.6 dB
SigQu: microreflections = 38 dBc
Cable modem status = Operational
Upstream transmit signal power = 55.0 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 = 0
T4 timer expiries = 0
Ranging Aborts = 0
Tx mini-slots used (contended).385 = 0
Tx mini-slots used (dedicated).385 = 404326
Tx data re-tries.385 = 0
Tx data retry limit exceeded.385 = 0
Tx bandwidth req retries.385 = 10018
Tx bw req retry lim exceeded.385 = 0
Date and Time = 2004-07-07,21:22:30.0
Configuration filename = 768-64-1.BIN
我的環境是:我cable的線路並不是獨立直接接在cable modem上,因為要看第四台,所以有分接。
有幾個問題想請教:
1.Downstream received signal power = -13.5 dBmV
我在沒有分接之前數值是在-7左右,請問-13或是甚至到-15會不會有什麼不好的影響。
2.SigQu: received without error = 65250784 codewords
這個error的數字一直攀升,是正常嗎?
3.Upstream transmit signal power = 55.0 dBmV
這個數值在分接之前是大約52左右,分接之後就飆到55了,之前拜讀您的文章中有談到這個數值到55幾乎是要斷線了,但是以我目前的連線狀況來看,是還算正常,所以想請教您我現在這個數值55危險嗎?有沒有什麼改進的方法讓他降下去。
4.Tx mini-slots used (dedicated).385 = 404326
Tx bandwidth req retries.385 = 10018
這兩個數值一直在攀升,是正常嗎?
不好意思問了您這麼多問題,目前我的連線速度還算正常,只是想看看我的連線環境是不是有需要改進的and分接對我的線路影響是不是會很大,有沒有改進的方法。
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