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1993-12-19
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103 lines
Hardware Section.....
Q-1: Is current RS-1600 upgradable to use dual power supply ?
A-1:
No, the dual-power rack chasis has two slots for power supply unit. The chasis
and backplane are both different. The RP-2000 dual power supply unit is also
different from previous single power supply unit.
Q-2: Does ZyXEL have another version of firmware special for U-1496P ?
Is U-1496P using 1M EPROM?
A-2:
ZyXEL develops one unique version of firmware for U-1496P model. The firmware
code has a C suffix, such as RM620C.U12, and RM620C.U13.
The U-1496P is equipped with 1M bit 29F series 5V only Flash EPROM chips.
Q-3: How to modify U-1496 modem to accomodate 2M bit EPROM's ?
A-3:
. The 2M bit EPROM has 32 pins the same as the 1M bit EPROM does. In order
for the existing of U24 and U25 need to be modified as follows :
. Pin 30 of the orginal socket accomodating 1M bit EPROM needs to be removed.
. Install a 32 pin socket onto the top of the original socket.
. Solder a wire to connect pin 30 of the new socket to pin 46 of U26 (MC68000).
. Solder a jumper-wire to short pin 31 and pin 16 of the socket.
. Put the new firmware on the add-on socket and do a power-on test.
Q-4: How is the U-1496P powered ? Battery ? NiCd cell ?
A-4:
The U-1496P can be powered by an AC power adaptor, +12V battery, or by common
car cigarette lighter adaptor.
Q-5: What is the EPROM speed required on the plus models and regular models?
A-5:
A) 150ns or faster EPROMs are recommended for non-plus model modems.
B) 100ns EPROMs are recommend for the plus model modems.
Q-6: What is the data pump ZyXEL is using?
A-6:
The ZyXEL modems use self-developed ZyXEL data pumps with two TI's Digital
Signal Processor chips.
Q-7: What settings are required to obtain the fastest data connection.
A-7:
1. Lock the serial port speed to the fastest/highest speed supported by the
host computer.
2. Turn on hardware flow control by enabling RTS/CTS flow control in the
communication program.
3. External modem owners must use a modem cable(RS-232) that provides
hardware flow control signal wires.
4. Recommmended that the computer's serial port uses 16550 UART chips.
Q-8: How to do a hardware reset?
A-8:
1) U-1496
Holding the " ENTER " key down for a few seconds while powering up will reset
the modem. The LCD display will show " Loading default ".
2) U-1496E & E+
Holding the " VOICE/DATA " key down for a few seconds while powering up the
modem will reset the modem. The modem will also run continuous analog loopback
self-test. Printable characters will be shown on the terminal connected to the
modem's RS232 port. The HS,CD,DSR,CTS,RXD,EC,SQ and TST LEDs should be ON.
3) U-1496B & B+
Short the TS2 jumper with a plug then power up the computer. The modem will
be reset and will continuously run self-test. Printable characters will be
shown on the computer screen. The TS1 LED should be continuously ON.
Q-9: In U-1496E and U-1496R how to auto dial a number when data/voice switch
is pushed?
A-9:
Set the S35.4=1 will make the modem dial the default number when the
Data/Voice switch is pushed. It is necessary to save the number in the
default phone directory first.