Control Ch Speed; Symb Select Criterion (Distortion); Main Ch Speed Selection Standard; Tx And Rx - Konica Minolta FK-502 Service Manual

FK-502 Service Manual Ver.1.0
2400
• Effective both at the time of sending and receiving
• The upper limit value of V.34 maximum bit speed is determined.
• Normally you do not need to change the value. In case that a V.34 error frequently occurs, you can
attempt to set up SYMB3000 and decrease the symbol rate, for instance.
b.

Control CH Speed

• A bit speed of the control channel
• Default is 1200 (The bit speed of many modems is 1200.)
• The negotiation of 2400/1200 is performed in the V.34 start-up procedure.
• Normally you do not need to change the setting.
c.

SYMB Select Criterion (Distortion)

• S/N is measured by sending and receiving line conditioning signal (L1/L2) in the Phase 2. Its result deter-
mines the SYMB speed (modulation speed).
• -6 to +6 [dB]
• Standard......... It becomes easy to select a high SYMB by using "- direction".
• Distortion..It becomes easy to select a high SYMB by using "+ direction".
• After S/N and distortion are measured, optimum SYMBOL rate is determined.
d.

Main CH Speed Selection Standard

• The bit speeds of V.34 are determined by the Phase 3 (training).
• This functional parameter sets thresholds for the bit speed determination.
• -8 to +7 (dB)
• It becomes easy to select a high speed by using "- direction".
e. PIX TxATT, TONE/Procedure Signal TxATT, CED/ANSam TxATT and DTMF TxATT
• Output level setting
• 10 to -15 [dBm] (Depends on country spec)
• Directly sets modem. there are no external attenuater.
f. CD/SED ON Level
• Reception signal sensitivity level -33 to -48 [dBm] in steps of 5dBm
• SED is not used.
• Default is -48dBm.
g.

TX and RX

• Frequency Response of the Cable Attenuation Equalizer
Frequency Response of the Cable Amplitude Equalizer
8
6
4
2
0
-2
-4
-6
-8
0
500
1000
1500 2500
2000 3000
Frequency (Hz)
FUNCTION PARAMETER SETTING
0dB
4dB
8dB
12dB
3500 4000
3-5