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Специалист по модемам

От Dmitry Kanidev (2:5020/2038) к Sergey Dorozhkin

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


Пpивeтcтвyю тeбя, Sergey !

Суб. 12 янв. 2019г. в 08:57, Sergey Dorozhkin пишет к All:


SD> /// Привет, All! \\\
SD> Кто тут сабж ?
Я сварщик ненастоящий, :) но попробую.
SD> Объясните ситуацию:
Что именно требует объяснений? Разная скорость коннекта, или какие-то другие аспекты? Т.к. никакой уточняющей информации нет, будем считать, 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 = 0 Hz
SD> Tx Baud Rate = 3200 Baud Rx Baud Rate = 8000 Baud
SD> Tx Bit Rate = 26400 bps Rx Bit Rate = 40000 bps
SD> Tx Power = -17.00 dBm Rx Level = -12.09 dBm
SD> Phase Jitter = x.x degree Frequency Offset = x.x Hz
SD> SNR = 43.19 dB Round Trip Delay = 260.18 ms
SD> Near End Echo = x.x dB Eye Quality Measure = 01BE
SD> Nonlinear Encoder = ON DPCM PCM Coding = A Law
SD> Tx Shaping = Exp APCM Codec Type = U Law
SD> Trellis Encoder = 16 state Digital PAD Loss = 0.00 dB
SD> Tx Filter Index = 0 TRN1d RMS value = 2115
SD> Tx Precoder Coefficients = 00D7 FF97 FF5A 0025 FF79 FF56
SD> Data Frame Intervals RBS Status = I0:N I1:N I2:N I3:N I4:N I5:N
Здесь видим очень сильный уровень входного сигнала (Rx Level), хорошее соотношение сигнал/шум (SNR). Как итог - высокая битовая скорость (Rx/Tx Bit Rate) и, как следствие, скоростной коннект.

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 = 4344 Hz
SD> Tx Baud Rate = 600 Baud Rx Baud Rate = 600 Baud
SD> Tx Bit Rate = 2400 bps Rx Bit Rate = 2400 bps
SD> Tx Power = -11.00 dBm Rx Level = -42.14 dBm
SD> Phase Jitter = 0.00 degree Frequency Offset = 0.08 Hz
SD> SNR = 7.75 dB Round Trip Delay = 0.00 ms
SD> Near End Echo = -115.47 dB Far End Echo = -114.87 dB
SD> Nonlinear Encoder = OFF Nonlinear Decoder = OFF
SD> Tx Shaping = Min Rx Shaping = Min
SD> Trellis Encoder = 16 state Convolutional Decoder = 16 state
SD> Tx Filter Index = 0 Remote Tx Filter Index= 0
SD> Tx Precoder Coefficients = 0000 0000 0000 0000 0000 0000
SD> Remote Tx Precoder Coefficients = 0000 0000 0000 0000 0000 0000
Здесь ситуация прямо противоположная: мы слышим удаленный модем очень плохо (Rx Level), сигнал практически тонет в шумах (SNR). Соединение завершено из-за приема модемом кадра [DISC] (disconnect).


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

SD> -0| = = = = = = = = = = = = = H00:DD44 H01:E232
SD> -2| = = = = = = = = = = = = = = = = = = H02:E281 H03:E242
SD> -4| = = = = = = = = = = = = = = = = = = H04:E211 H05:E252
SD> -6| = = = = = = = = = = = = = = = = = = = = H06:E25A H07:E242
SD> -8| = = = = = = = = = = = = = = = = = = = = H08:E1E3 H09:E211
SD> -10| = = = = = = = = = = = = = = = = = = = = H10:E242 H11:E242
SD> -12| = = = = = = = = = = = = = = = = = = = = H12:E1F8 H13:E1EF
SD> -14| = = = = = = = = = = = = = = = = = = = = = H14:E211 H15:E22A
SD> -16| = = = = = = = = = = = = = = = = = = = = = H16:E222 H17:E1B2
SD> -18| = = = = = = = = = = = = = = = = = = = = = H18:E0BE H19:DC7C
SD> -20| = = = = = = = = = = = = = = = = = = = = = H20:D436
SD> -22| = = = = = = = = = = = = = = = = = = = = = 0000 0077 0000 00CF 0000 00CF
SD> -24| = = = = = = = = = = = = = = = = = = = = = 00CF 044C 0000 0435 0000 0598
SD> -26| = = = = = = = = = = = = = = = = = = = = = 0001 0001 0001 0000 0013 000D
SD> -28| = = = = = = = = = = = = = = = = = = = = = AGC: 9.76 dB/0000 /0001
SD> -30| = = = = = = = = = = = = = = = = = = = = = IMD: 0005 /0011
SD> dB +-------------------------------------------- Echo Pwr: -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: -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: -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: 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 dB/ 5.64
SD> OK
Здесь нечто среднее между 1 и 2 случаем. Hа графике АЧХ видим некоторый завал в области верхней части спектра. Конденсаторы в телефонных розетках не стоят? Или телефоны параллельные?


With the best wishes to you,dear Sergey ! Bye !

Sincerely yours,
Dmitry Kanidev (Дмитpий Kaнидьeв)


... DCE seeks DTE for mutual exchange of data.

--- 73 & Cheerio! de RV3ATY and GoldEd 1.1.5-b20170303
* Origin: -= DKsoft Station, Moscow, Russia =- (2:5020/2038)

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

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