衛星通信機器のパラメータ調査 (About the satellite network modem parameters)

モデムの置き場所(location of the modems)

ASTE site

電源コンテナ入ってすぐの防塵箱の中
In a dusttight box in (light blue) powerline container

SPdA

FAXの裏に置いてあるUPS上の防塵箱の中
In a dusttight box next to a FAX.

パラメータの出し方 (How to check the parameters)

もしかしたら真ん中のボタンじゃなく、その左右のボタンだったかもしれません。
その場合は上記と同様に押してみて下さい。

es2.png

山頂での注意点 (Note for checking the level at the ASTE site)

風によってアンテナがぶれて信号レベル(dB)が変動する可能性があるため、 数分間モニターして変動を確認すること。 また、風速との相関を調べるために簡単な定点観測を行い、時刻を記録しておくこと。 (風速はログから割り出せる。)

Observe the dB level for a few minutes because the signal (dB) value may vary by wind speed which may change the receiving antenna pointing. Remember to record the time of observation to see how it is infuenced by the wind as the wind speed is logged by COSMOS.

Reference: Web Envmon( http://aste-www.mtk.nao.ac.jp/envmon/monitor_www.html )

signal level log

We do not have a nominal value. But it looks different by the receiving site. ==> We have to ask Telefonica.

   * Signal levels of a modem in SPdA, 2010/06/08
   * just after amplifier was replaced by telefonica -> nominal value
   2: Tx Clk 00 kHz
   2: Rx Clk 56.000 kHz
   5: Eb/No 10.7 dB
   5: Rx Offset 5588 Hz
   5: AGC level 127
   5: Chan Er Rate 8x10-4
   5: Buffer Fill Level 47%
   * Signal levels of a modem in Pampa la Bola, 2008
   * had no problem -> nominal value??
   2: Tx Clk 128.000 kHz
   2: Rx Clk 128.000 kHz
   5: Eb/No 14.5 dB
   5: Rx Offset 9514 Hz
   5: AGC level 114
   5: Chan Er Rate 0x10-5
   5: Buffer Full Level N/A
   * Signal levels of a modem in Pampa la Bola, 2011/01/29, 12:41 PM
   * had no problem, but we don't have Internet??
   2: Tx Clk 127.999 kHz
   2: Rx Clk 128.000 kHz
   5: Eb/No 9.5 dB
   5: Rx Offset 12199 KHz
   5: AGC level 137
   5: Chan Er Rate 5x10-4
   5: Buffer Full Level N/A
datelevel(dB)wind(m/s)Notes
ASTE site
2011040110.4
201103309.8
2010081111.3>20
2010080710.511
2010072210.4
2010060110.3
SPdA
201103249.9-restart SPdA office
2010060810.7-replaced amplifier -> nominal value
201006016.8-

No comment. Comments/Computer and Network/satellite network/Old network system

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