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1994-04-23
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Firmware 6.12 release note April.18.1994
------------------------------
New Feature:
Modem
1. ZyCellular mode added
ZyXEL U-1496 Series modems are equipped with a special cellular communication
mode which enables the modem to provide reliable high speed data transmissions
over cellular phone links
In addition to normal modem, fax and voice operation modes, the following
cellular modes are offered in ZyXEL's U-1496 series modems:
Mode Speed
MULTI-AUTO: ZyX modes V.32bis/V.32/V.22bis/G3 FAX/Cellular Modes
CELL 14400: 14400/12000/9600/7200/4800 (AT&N42)
CELL 12000: 12000/9600/7200/4800 (AT&N43)
CELL 9600: 9600/7200/4800 (AT&N44)
CELL 7200: 7200/4800 (AT&N45)
CELL 4800: 4800 (AT&N46)
CELL 14400 will connect with another modem using cellular mode at a speed
of up to 14400bps. It will also connect with another V.32bis/V.32 modem.
The actual speed depends on the line condition. The modem will automatically
fall-back or fall-forward within its speed range. CELL 12000, CELL 9600,
CELL 7200 and CELL 4800 limit the maximum speed to 12000bps, 9600bps, 7200bps
and 4800bps, respectively.
In Multi-Auto mode a ZyXEL modem will automatically and dynamically select
the best speed and mode in which to operate. Selecting one of the above
cellular modes manually will limit the maximum speed at which the modem will
operate.
The ZyCellular Option is recommended when using cellular links for modem
connection. It can also be used on other poor line conditions such as a
line with frequent large impulse noises. ZyCellular mode is more noise
resistant, impairment resistant, and error resistant.
It is simple to use the ZyCellular modems. Everything is determined
automatically by the modem. The user needs only to set S-register S49
bit 7 to leave the modem on cellular mode. S49 bit 7 tells the modem
where it is installed. If S49.7=0, the modem is installed in an office
connected to a normal telephone line. If S49.7=1, it means the modem is
a mobile unit connected to a cellular phone. When a ZyCellular modem
calls or answers another modem, it will indicate its cellular capability
and whether it is using a cellular phone. If both sides have the ZyCellular
Option and at least one side is using a cellular phone, the connection will
automatically be a cellular mode connection. If one side is a non-cellular
modem the connection will automatically be a standard mode.
If manual transmit power setting is desired, set S43.2=1 to disable auto
transmit power adjustment and use S49 bit 0-3 to set transmit power at -9
to -24 dBm.
If cellular mode connection is never desired, set S43.3=1 to disable the
cellular mode connection. The default is enabled (S43.3=0).
You are also able to send and receive faxes on cellular links by just
setting S49.7=1 on the ZyCellular modem that is installed on the cellular
site. Now your modem can send and receive faxes from fax machines and other
fax modems.
2. Support 100 dial digits on one dial string.
3. Bit S48.3 is used to reverse V.23 channel speed.
Originate side speed (send/rcv) Answer side speed (send/rcv)
s48.3=0 75/1200 1200/75
s48.3=1 1200/75 75/1200
4. Add ATO1 command, this command can force modem to request a retrain.
5. Set S48.4=1 and &D1, DTR ON will make the modem dial the default number
and DTR OFF will make the modem hangup and reset to profile 0. When the
modem is in idle state (waiting for command), it will not dial the default
number, when the DTR signal transits from ON to OFF.
6. In EG+ model, no more blacklist but the modem delays 30 seconds between
every call. Press D/V button on EG+ or "MENU" key on SG+ will skip the delay and dial
immediately.
7. Set S25 to define a time value for how long the DTR drop will recognize
as a DTR drop, in 10 ms unit. If S25=0 the default time is 4 ms at least
for DTR drop recognition.
FAX
1. Class 2.0 Fax command is available on this version.
2. Add new command for class 2 .
2.1:+FMINSP= Minimum phase C speed parameter (0 to 5).
0:2400bps 1:4800bps 2:7200bps
3:9600bps 4:12000bps 5:14400bps
2.2:+FCQ= Copy quality check capability parameter (0 to 2).
0:No copy quality check capability.
1:Only check 1D phase C data.
2:Check both 1D & 2D phase C data.
2.3:+FK orderly fax abort command.
3. Report Detailed HangUp code information for both Class 2 and Class 2.0.
4. Support T.4 1D/2D decompression, error line report and correction.
Correction method for 1D: if the number of consecutive error lines is less
than 4 lines the error line is substituted by the previous good line,
otherwise the bad line is deleted. For 2D the error line is simply deleted.
VOICE
1. AT+VDD, This command sets the duration of DTMF tone detection. The unit is
5 msec, default value is 6 (30msec). The modem reports DTMF event when it
detects a continuous tone for this period.
2. AT+VDH, This command sets the threshold of the DTMF tone detection. The
default value is 16. Decreasing the value makes the modem more sensitive.
The range of VDH is 0-31.
3. The 2 and 3-bit ADPCM format is changed. It is necessary to add the leakage
coefficient for every sample. Please refer to the C code program VCNVT.C
and 610TO612.C for detail information. It is recommended to re-record your
greeting message because the new leakage will give better voice quality.
4. AT+VGT, This command sets the playing volume of voice. The default value
is 192, a higher value makes the voice louder. The range of VGT is 0-255.
Improvement:
Modem
1. Endless retrain on S48.1=1 (data mode only) is fixed.
2. Performance on V.26bis dial-up line half-duplex mode is improved.
3. In security call back mode, the DSR and DCD will turn on only after call
back has established.
4. In ATI2 response, ">100M" error message fixed.
5. Set S43.7=1 to fix DCE connection speed. Modem will disconnect if connection
speed is not selected.
6. In EG+ model, Flash "!" function modified to be the same as E+ model.
Voice
1. "AT+VLS=16" command gets a response "OK", it should be "VCON".
2. Sending the "ATH" command in voice mode and offhook state will hang modem.
3. Sending "AT&F" following the command "AT+FCLASS=8" gets a response of
"NO CARRIER", it should be "OK".