home *** CD-ROM | disk | FTP | other *** search
-
-
- 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".