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Re: Специалист по модемам

От Sergey Dorozhkin (2:5020/806.1) к Dmitry Kanidev

В ответ на Заголовок предыдущего сообщения в треде (Имя Автора)



==- Hello Dmitry! -==

Ответ на сообщение Dmitry Kanidev (2:5020/2038) к Sergey Dorozhkin, написанное 13 янв 19 в 17:44:

SD>> Объясните ситуацию:

DK> Что именно требует объяснений? Разная скорость коннекта, или какие-то
DK> другие аспекты? Т.к. никакой уточняющей информации нет, будем считать,
DK> что речь о скорости.

SD>> ****
SD>> atdt84956007000

SD>> CONNECT 230400/V.92 44000/V44
SD>> ati12i13

SD>> ZyXEL MODEMS PHYSICAL LAYER STATUS REPORT

SD>> Modulation mode = V.92
SD>> Tx Carrier = 1829 Hz Rx Carrier =
SD>> 0 Hz
SD>> Tx Baud Rate = 3200 Baud Rx Baud Rate =
SD>> 8000 Baud
SD>> Tx Bit Rate = 26400 bps Rx Bit Rate =
SD>> 40000 bps
SD>> Tx Power = -17.00 dBm Rx Level =
SD>> -12.09 dBm
SD>> Phase Jitter = x.x degree Frequency Offset =
SD>> x.x Hz
SD>> SNR = 43.19 dB Round Trip Delay =
SD>> 260.18 ms
SD>> Near End Echo = x.x dB Eye Quality Measure =
SD>> 01BE
SD>> Nonlinear Encoder = ON DPCM PCM Coding =
SD>> A Law
SD>> Tx Shaping = Exp APCM Codec Type =
SD>> U Law
SD>> Trellis Encoder = 16 state Digital PAD Loss =
SD>> 0.00 dB
SD>> Tx Filter Index = 0 TRN1d RMS value =
SD>> 2115
SD>> Tx Precoder Coefficients = 00D7 FF97 FF5A 0025
SD>> FF79 FF56
SD>> Data Frame Intervals RBS Status = I0:N I1:N I2:N I3:N
SD>> I4:N I5:N

DK> Здесь видим очень сильный уровень входного сигнала (Rx Level), хорошее
DK> соотношение сигнал/шум (SNR). Как итог - высокая битовая скорость
DK> (Rx/Tx Bit Rate) и, как следствие, скоростной коннект.

Этот номер у меня эталон для настройки.

SD>> atdt84955974300

SD>> CONNECT 2400/V.22b 2400/V42b/SREJ

SD>> ATI2I12I13I14


SD>> ZyXEL MODEMS LINK STATUS REPORT

SD>> Chars Sent 2 Chars Received 239
SD>> Octets Sent 2 Octets Received 172
SD>> Blocks Sent 2 Blocks Received 14
SD>> Blocks Resent 0 Max Outstanding 15
SD>> Max Block Size 128 Retrains Requested 0
SD>> Link Duration 0 Retrains Granted 0
SD>> FRN Requested 0 FRN Granted 0
SD>> FCS Errors 2 Round Trip Delay 0
SD>> Xmitter Underrun 0 Receiver Overrun 0

SD>> Last Speed/Protocol 2400/ARQ/V.22b/V42b/SREJ

SD>> Disconnect Reason DISC received

SD>> ZyXEL MODEMS PHYSICAL LAYER STATUS REPORT

SD>> Modulation mode = V.22b
SD>> Tx Carrier = 65024 Hz Rx Carrier =
SD>> 4344 Hz
SD>> Tx Baud Rate = 600 Baud Rx Baud Rate =
SD>> 600 Baud
SD>> Tx Bit Rate = 2400 bps Rx Bit Rate =
SD>> 2400 bps
SD>> Tx Power = -11.00 dBm Rx Level =
SD>> -42.14 dBm
SD>> Phase Jitter = 0.00 degree Frequency Offset =
SD>> 0.08 Hz
SD>> SNR = 7.75 dB Round Trip Delay =
SD>> 0.00 ms
SD>> Near End Echo = -115.47 dB Far End Echo =
SD>> -114.87 dB
SD>> Nonlinear Encoder = OFF Nonlinear Decoder =
SD>> OFF
SD>> Tx Shaping = Min Rx Shaping =
SD>> Min
SD>> Trellis Encoder = 16 state Convolutional Decoder =
SD>> 16 state
SD>> Tx Filter Index = 0 Remote Tx Filter Index=
SD>> 0
SD>> Tx Precoder Coefficients = 0000 0000 0000 0000
SD>> 0000 0000
SD>> Remote Tx Precoder Coefficients = 0000 0000 0000 0000
SD>> 0000 0000

DK> Здесь ситуация прямо противоположная: мы слышим удаленный модем очень
DK> плохо (Rx Level), сигнал практически тонет в шумах (SNR). Соединение
DK> завершено из-за приема модемом кадра [DISC] (disconnect).

Это понятно. На той стороне надо существенно поднять громкость ?
2АМ: можешь показать свои данные по соединения, может действительно тебе стоит добавить громкости.

SD>> atdt84962502503

SD>> CONNECT 14400/V.34 14400/V44/SREJ

SD>> ati12i13

SD>> ZyXEL MODEMS PHYSICAL LAYER STATUS REPORT

SD>> Modulation mode = V.34
SD>> Tx Carrier = 1920 Hz Rx Carrier =
SD>> 1920 Hz
SD>> Tx Baud Rate = 3200 Baud Rx Baud Rate =
SD>> 3200 Baud
SD>> Tx Bit Rate = 26400 bps Rx Bit Rate =
SD>> 14400 bps
SD>> Tx Power = -11.00 dBm Rx Level =
SD>> -23.94 dBm
SD>> Phase Jitter = 0.00 degree Frequency Offset =
SD>> -0.03 Hz
SD>> SNR = 19.70 dB Round Trip Delay =
SD>> 421.37 ms
SD>> Near End Echo = -29.65 dB Far End Echo =
SD>> 127.43 dB
SD>> Nonlinear Encoder = ON Nonlinear Decoder =
SD>> ON
SD>> Tx Shaping = Min Rx Shaping =
SD>> Min
SD>> Trellis Encoder = 64 state Convolutional Decoder =
SD>> 64 state
SD>> Tx Filter Index = 9 Remote Tx Filter Index=
SD>> 9
SD>> Tx Precoder Coefficients = 0000 0000 0000 0000
SD>> 0000 0000
SD>> Remote Tx Precoder Coefficients = 0000 0000 0000 0000
SD>> 0000 0000

SD>> -0| = = = = = = = = = = = = = H00:DD44
SD>> H01:E232
SD>> -2| = = = = = = = = = = = = = = = = = = H02:E281
SD>> H03:E242
SD>> -4| = = = = = = = = = = = = = = = = = = H04:E211
SD>> H05:E252
SD>> -6| = = = = = = = = = = = = = = = = = = = = H06:E25A
SD>> H07:E242
SD>> -8| = = = = = = = = = = = = = = = = = = = = H08:E1E3
SD>> H09:E211
SD>> -10| = = = = = = = = = = = = = = = = = = = = H10:E242
SD>> H11:E242
SD>> -12| = = = = = = = = = = = = = = = = = = = = H12:E1F8
SD>> H13:E1EF
SD>> -14| = = = = = = = = = = = = = = = = = = = = = H14:E211
SD>> H15:E22A
SD>> -16| = = = = = = = = = = = = = = = = = = = = = H16:E222
SD>> H17:E1B2
SD>> -18| = = = = = = = = = = = = = = = = = = = = = H18:E0BE
SD>> H19:DC7C
SD>> -20| = = = = = = = = = = = = = = = = = = = = = H20:D436
SD>> -22| = = = = = = = = = = = = = = = = = = = = = 0000 0077 0000
SD>> 00CF 0000 00CF
SD>> -24| = = = = = = = = = = = = = = = = = = = = = 00CF 044C 0000
SD>> 0435 0000 0598
SD>> -26| = = = = = = = = = = = = = = = = = = = = = 0001 0001 0001
SD>> 0000 0013 000D
SD>> -28| = = = = = = = = = = = = = = = = = = = = = AGC: 9.76
SD>> dB/0000 /0001
SD>> -30| = = = = = = = = = = = = = = = = = = = = = IMD: 0005
SD>> /0011
SD>> dB +-------------------------------------------- Echo Pwr:
SD>> -38.34/ -34.10
SD>> F 0 0 0 0 0 1 1 1 1 1 2 2 2 2 2 3 3 3 3 3 3 L1 Power:
SD>> -17.23/ -15.22
SD>> R 1 3 4 6 7 0 3 5 6 9 1 2 5 7 8 0 1 3 4 6 7 L2 Power:
SD>> -23.25/ -21.16
SD>> E 5 0 5 0 5 5 5 0 5 5 0 5 5 0 5 0 5 0 5 0 5 S/N:
SD>> 34.34
SD>> Q 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 S/E: 15.09
SD>> dB/ 5.64 OK

DK> Здесь нечто среднее между 1 и 2 случаем. Hа графике АЧХ видим
DK> некоторый завал в области верхней части спектра. Конденсаторы в
DK> телефонных розетках не стоят? Или телефоны параллельные?

Стоит немного увеличить громкость на передачу ?
Нет никого на линии кроме модема, проблема шлюза видимо (возможно программно подключается ёмкость, но к сожалению я не могу этой железякой рулить).

-=< До следующих встреч, Dmitry. Искренне ваш, Sergey >=-

[Team HAM] [Team Rally] [Team 4x4] [Team OffRoad]
... MyCall R2AKT, ex UB3AHT.

--- aka 2:5020/1906.908, Ex 2:5020/904.753, Ex 2:5020/1412.753
* Origin: Elinora Station (2:5020/806.1)

Ответы на это письмо:

From: Username
Заголовок следующего сообщения в треде может быть длинным и его придется перенести на новую строку

From: Username
Или коротким

FGHI-url этого письма: area://RU.MODEM?msgid=2:5020/806.1@fidonet.org+5c52daee