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NCU PARAMETERS
28 August, 2000
4-72
Address
Function
Unit
Remarks
4804BD
Modem turn-on/off level (incoming signal detection level)
Turn-on level
00 (H): -33dBm
01 – 0A (H): -38 dBm
0B – 14 (H): -43 dBm
15 – 1F (H): -48 dBm
Turn-off level
The turn-off level is automatically set at “turn-on level minus 3 dBm”.
4804BE
to
4804C6
Not used
Do not change the
settings.
4804C7
Bits 0 to 3 – Not used.
Bit 4 – V.34 protocol dump
0:
Simple,
1:
Detailed (default)
Bits 5 to 7 – Not used.
4804C8
to
4804D9
Not used
Do not change the
settings.
4804DA
T.30 T1 timer
1 s
NOTES
1. If a setting is not required, store FF in the address.
2. In Europe, if the country code is not specified, set it to UK (02).
3. Italy and Belgium only
RAM address 48045E: the lower four bits have the following meaning.
Bit 2 1: International dial tone cadence detection enabled (Belgium)
Bit 1 Not used
Bit 0 1: PSTN dial tone cadence detection enabled (Italy)
If bit 0 or bit 2 is set to 1, the functions of the following RAM addresses are
changed.
480408 (if bit 0 = 1) or 480438 (if bit 2 = 1): tolerance for on or off state
duration (%), and number of cycles required for detection, coded as in address
480433.
48040B (if bit 0 = 1) or 48043B (if bit 2 = 1): on time, hex code (unit = 20 ms)
48040C (if bit 0 = 1) or 48043C(if bit 2 = 1): off time, hex code (unit = 20 ms)
4. Pulse dial parameters (addresses 48044A to 48044F) are the values for 10
pps. If 20 pps is used, the machine automatically compensates.
5. The first ring may not be detected until 1 to 2.5 wavelengths after the time
specified by this parameter.