RFX144V24-S23 and RFX96V24-S23 Modem Designer’s Guide
1070
4-13
No. 50
Sleep Mode
Writing a 0 to this register when the modem IA circuit is not in the Sleep Mode (see ~SLEEP pin in Table 2-3) puts the
modem into the Sleep Mode.
The modem will go through the power-on sequence and resume normal operation with default values in response to a
hardware power-on reset, or a write to the scratchpad interface by the host.
No. 51
V.23 Receive Compromise Equalizer Taps
Access codes 18h through 4Fh represent 56 taps.
Format:
16 bits, signed, twos complement, real
Default Values: The default values of the Receive Compromise Equalizer provide 50% compensation (both amplitude
and group delay) of a 1040 Tellindus line (which approximates a CCITT 1040/1025 line). Access code
4Fh is used for the first equalizer tap, and Access code 18h is used for the last equalizer tap.
No. 52
V.23 RTS to CTS Turn Off Transition Time
This parameter controls the minimum RTS to CTS turn off transition time.
Format:
16 bits, positive, twos complement
Equation:
[Desired time in tenths of milliseconds]h
Default Value:
0014h (2 ms)
No. 53
V.23 RTS to CTS Turn On Transition Time
This parameter controls the minimum RTS to CTS turn on transition time.
Format:
16 bits, positive, twos complement
Equation:
[Desired time in tenths of milliseconds]h
Default Value:
0064h (10 ms)
No. 54
V.23 Number of Bits (Caller ID only)
This parameter selects the number of bits per character for Caller ID mode, including one start bit and one stop bit. Caller ID
mode does not use a parity bit. Characters from 5 to 8 data bits (7 to 10 bits total) are supported. In parallel mode, the start
and stop bits will be stripped from received data before it is placed in DBUFF.
Format:
16 bits, positive, twos complement
Equation: [Desired number of bits per received character]h
Default Value:
000Ah (8 data bits, 1 start bit, 1 stop bit, no parity - standard for Caller ID)
No. 55
Voice/Audio VOX Turn-On Threshold
When status bit VOX (17:3) is reset and the average energy of the message being encoded exceeds the VOX turn-on
threshold, the modem sets the VOX bit to indicate speech is being detected. The VOX turn-on threshold should be less than
the AGC gain adaptation threshold when the Energy AGC is not disabled and bit DCVOX is zero.
Format:
16 bits, signed, twos complement
Equation:
Level = (10[x/20])(23315)
Where:
x = VOX turn-on threshold in dBm.
Default Value:
0088h (-44.68 dBm)
No. 56
Voice/Audio VOX Turn-Off Threshold
If status bit VOX (17:3) is set, the modem resets VOX when the average energy of the message being encoded falls below
the VOX turn-off threshold for a minimum period of time equal to the time constant of the VOX energy averaging filter. The
time constant is specified by the VOX energy averaging filter coefficient A0 (see No. 57).
Format:
16 bits, signed, twos complement
Equation:
Level = (10[x/20])(23315)
Where:
x = VOX turn-off threshold in dBm.
Default Value:
0044h (-50.70 dBm)
Summary of Contents for RFX144V24-S23
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