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ST75C540 Datasheet(PDF) 35 Page - STMicroelectronics |
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ST75C540 Datasheet(HTML) 35 Page - STMicroelectronics |
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35 / 84 page  MODC Modify Configuration MODC Opcode: 21 001 00001 Synopsis MODC allows the modification of the parameters defined by the CONF command. Parameters Field Byte Pos. Value Definition MODC_SDM 1 0 0 1 Normal data mode Short data mode (e.g. TVR) (5) MODC_DV21F 1 1 0 1 Normal V.21ch2 (1) Disable V.21ch2 flag detector MODC_DDTMF 1 2 0 1 Normal DTMF detector (1) Disable DTMF detector MODC_DTDT4 1 3 0 1 Normal secondary tone detector (1) Disable secondary tone detector MODC_DTDT16 1 4 0 1 Normal primary tone detector (1) Disable primary tone detector MODC_SH 1 6 0* 1 Normal training sequence Short training sequence (2) MODC_FS 1 7 0* 1 Secondary tone detector sampling frequency is 4.8kHz Secondary tone detector sampling frequency is 9.6kHz MODC_V22G (6) 2 1..0 00* 01 10 No guard tone 1800Hz guard tone (V.22bis/V.22) 550Hz guard tone (V.22bis/V.22) MODC_FPT 2 3..2 00* 01 10 No echo protection tone Long echo protection tone (180ms) (4) Short echo protection tone (30ms) (4) MODC_NOTA (6) 24 0* 1 Answer mode : generate answer tone for handshake Originate mode : wait answer tone for handshake Answer mode : do not generate answer Originate mode : do not wait answer tone MODC_NOSA (6) 26 0* 1 Cut answer tone when receiving AA (V.32bis, V.32) Continue answer tone when receiving AA. MODC_NOQA (6) 27 0* 1 Enable V.32bis/V.32 autoretrain on quality. Disable V.32bis/V.32 autoretrain on quality. MODC_ADCFD 3 0..3 0000* 0001 0010 0011 1111 1110 1101 0111 Other Low bit rate decoder voice frame duration 30ms (nominal) Low bit rate decoder voice frame duration 35ms (+16%) Low bit rate decoder voice frame duration 40ms (+33%) Low bit rate decoder voice frame duration 45ms (+50%) Low bit rate decoder voice frame duration 25ms (-16%) Low bit rate decoder voice frame duration 20ms (-33%) Low bit rate decoder voice frame duration 15ms (-50%) Low bit rate decoder pause Reserved MODC_COD 3 5 0 1 Low bit rate coder disabled Low bit rate coder enabled (3) MODC_LEC 4 0 0 1 Line echo canceller enabled Line echo canceller disabled MODC_AEC 4 1 0 1 Audio echo canceller enabled Audio echo canceller disabled (3) MODC_FULLD 4 2 0 1 Full duplex mode enabled Half duplex mode enabled MODC_SOFTRx 4 3 0 1 Softclipping enabled on Rx Softclipping disabled on Rx MODC_AGC 4 4 0 1 AGC active AGC frozen MODC_SOFTTx 4 5 0 1 Softclipping enabled on Tx Softclipping disabled on Tx Notes : 1. In the modes where they are active. 2. Short train sequence must be preceded by at least one successful long train sequence at the same data rate. For V.17 a successful long train at any data rate must preceded the short train. 3. Only coder or decoder can be enabled at the same time. 4. Only when sending V.17, V.33, V.29 or V.27ter. 5. French Minitel Application (TVR : Teletel Vitesse Rapide). 6. ST75C540 only VII - COMMAND SET DESCRIPTION (continued) ST75C530 - ST75C540 35/84 |
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