90
KX-FT982LS-B / KX-FT984LS-B / KX-FT988LS-B
(Causes and Countermeasures)
Fig. a
(Overlapping the Echo of the DIS signal and DCS signal)
Fig. b
(Countermeasure by Changing the CED Frequency)
No. Countermeasure Side
Echo Communication Problem Example
Countermeasure
Service Code
1
Sending side
Some time is needed to compare the level
of the receiving and sending signals for the
echo canceler. The header of the training
signal lacks due to a switching delay to
close S1.
Add a dummy signal to the beginning of
the training signal.
Service code (521)
(International mode select)
This countermeasure becomes
the default value.
2
Receiving side
The echo canceler function stops according
to a CED signal frequency of 2100Hz (S1
and S2 are both ON), a DIS signal is
returned as an echo, and a DCS signal
from the sending side overlaps the DIS
echo. Then the receiving side FAX cannot
retrieve the DCS signal.
(Refer to Fig. a)
Change to a 1100Hz CED signal fre-
quency. (Refer to Fig. b)
Service code (520)
(CED frequency select)
Receiving side
Change the regular rime of 75 msec
between the CED signal and DIS signal
to 500 msec. This will give at least 250
msec to recover the echo canceler
operation. (Refer to Fig. c)
Service code (593)
(Time between CED and 300
bps)
Sending side
The sending side FAX sends a DCS
signal not after receiving the 1st DIS
signal but after receiving the 2nd DIS
signal. (Refer to Fig. d)
Service code (594)
(Overseas DIS detection
select)
3
Sending side
Communication failure occurs in a long dis-
tance communication on the telephone line
without an echo canceler.
or
There are some cases (e.g. Mobil comms.)
which cause the collision of TX / RX signals
due to the delay / echo and noise of the
network / terminal. (Refer to Fig. e)
Decrease the transmission level from -
9 dBm to -15 dBm and the echo level
will decrease.
Service code (596)
(Transmit level set)
4
Sending side
Receiving side
Decrease the receiving sensitivity from
-13 dBm to about -32 dBm so an echo
signal will not received.
Service code (598)
(Receiving sensitivity)
5
Sending side
Receiving side
Set additional Pause time (Service
mode: code No. 774) in between the
original and its repeated signals, to pre-
vent the collision of the signals at both
end.
Service code (774)
(T4 timer)
Содержание KX-FT982LS-B
Страница 2: ...2 KX FT982LS B KX FT984LS B KX FT988LS B ...
Страница 12: ...12 KX FT982LS B KX FT984LS B KX FT988LS B 6 Technical Descriptions 6 1 Connection Diagram ...
Страница 14: ...14 KX FT982LS B KX FT984LS B KX FT988LS B 6 2 1 General Block Diagram ...
Страница 22: ...22 KX FT982LS B KX FT984LS B KX FT988LS B 6 4 2 Block Diagram ...
Страница 24: ...24 KX FT982LS B KX FT984LS B KX FT988LS B ...
Страница 72: ...72 KX FT982LS B KX FT984LS B KX FT988LS B Countermeasure ...
Страница 73: ...73 KX FT982LS B KX FT984LS B KX FT988LS B REFERENCE Test Mode P 55 ...
Страница 74: ...74 KX FT982LS B KX FT984LS B KX FT988LS B REFERENCE Test Mode P 55 ...
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Страница 79: ...79 KX FT982LS B KX FT984LS B KX FT988LS B REFERENCE Test Mode P 55 ...
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Страница 109: ...109 KX FT982LS B KX FT984LS B KX FT988LS B NG Wave pattern Note Refer to NG Example P 114 ...
Страница 111: ...111 KX FT982LS B KX FT984LS B KX FT988LS B I O and Pin No Diagram ...
Страница 114: ...114 KX FT982LS B KX FT984LS B KX FT988LS B 12 5 6 2 NG Example ...
Страница 116: ...116 KX FT982LS B KX FT984LS B KX FT988LS B ...
Страница 121: ...121 KX FT982LS B KX FT984LS B KX FT988LS B 12 5 9 2 Troubleshooting Flow Chart ...
Страница 127: ...127 KX FT982LS B KX FT984LS B KX FT988LS B 12 5 13 Thermal Head Section Refer to Thermal Head P 23 ...
Страница 128: ...128 KX FT982LS B KX FT984LS B KX FT988LS B 13 Service Fixture Tools ...
Страница 131: ...131 KX FT982LS B KX FT984LS B KX FT988LS B 14 1 2 How to Remove the Cutter Unit KX FT984 KX FT988 only ...
Страница 132: ...132 KX FT982LS B KX FT984LS B KX FT988LS B 14 1 3 How to Remove the Lock Lever and Thermal Head ...
Страница 133: ...133 KX FT982LS B KX FT984LS B KX FT988LS B 14 2 Lower Cabinet Section 14 2 1 How to Remove the Bottom Frame ...
Страница 134: ...134 KX FT982LS B KX FT984LS B KX FT988LS B 14 2 2 How to Remove the P C Boards and Power Cord ...
Страница 136: ...136 KX FT982LS B KX FT984LS B KX FT988LS B 14 3 Operation Panel Section 14 3 1 How to Remove the Operation Panel Block ...
Страница 137: ...137 KX FT982LS B KX FT984LS B KX FT988LS B 14 3 2 How to Remove the Operation Board LCD and Platen Roller ...
Страница 138: ...138 KX FT982LS B KX FT984LS B KX FT988LS B 14 3 3 How to Remove the Separation Rubber Flap ...
Страница 139: ...139 KX FT982LS B KX FT984LS B KX FT988LS B 14 4 Installation Position of the Lead Wires ...
Страница 140: ...140 KX FT982LS B KX FT984LS B KX FT988LS B ...
Страница 148: ...148 KX FT982LS B KX FT984LS B KX FT988LS B 15 2 3 4 Copying REFERENCE Sensor Section P 124 ...
Страница 153: ...153 KX FT982LS B KX FT984LS B KX FT988LS B 16 1 4 Power Supply Board ...
Страница 155: ...155 KX FT982LS B KX FT984LS B KX FT988LS B 16 3 Test Chart 16 3 1 ITU T No 1 Test Chart ...
Страница 156: ...156 KX FT982LS B KX FT984LS B KX FT988LS B 16 3 2 ITU T No 2 Test Chart ...
Страница 157: ...157 KX FT982LS B KX FT984LS B KX FT988LS B MEMO ...
Страница 170: ...170 KX FT982LS B KX FT984LS B KX FT988LS B MEMO ...
Страница 180: ...180 KX FT982LS B KX FT984LS B KX FT988LS B 20 1 1 Operation Panel Section KX FT982 KX FT984 ...
Страница 181: ...181 KX FT982LS B KX FT984LS B KX FT988LS B 20 1 2 Operation Panel Section KX FT988 ...
Страница 182: ...182 KX FT982LS B KX FT984LS B KX FT988LS B 20 1 3 Upper Cabinet Section ...
Страница 183: ...183 KX FT982LS B KX FT984LS B KX FT988LS B 20 1 4 Lower Cabinet Section ...
Страница 184: ...184 KX FT982LS B KX FT984LS B KX FT988LS B 20 1 5 Gear Block Section ...
Страница 185: ...185 KX FT982LS B KX FT984LS B KX FT988LS B 20 1 6 Screws ...
Страница 186: ...186 KX FT982LS B KX FT984LS B KX FT988LS B 20 1 7 Accessories and Packing Materials ...