ZyXEL Communications 2864 Series, User Manual, Page: 53 / 267

4–3
ZyXEL Parallel Port Adapter
ZyXEL is developing a special parallel port adapter that will make parallel port trans-
fers much faster between a PC and the Elite 2864. The speed limitation in this case
will be determined by how fast and how efficient the PC software program can han-
dle the data.
The operation instructions for this special parallel port adapter are included in the
adapter manual. Check ZyXEL's announcements for availability, which is expected
to be within a few months of the 2864's introduction. Refer to chapter 21 for infor-
mation on the ZyXEL serial/parallel I/O adapter.
Using the Microphone and Speaker Jacks
On the right side or back of the modem, there are two jacks for external microphone
and speaker connections. The speaker jack is capable of directly driving an 8 ohm
speaker. When an external speaker is plugged into the speaker jack, the internal
speaker is cut off. The speaker jack only drives one speaker. If you have two speakers
with a stereo plug, use a plug adapter that will enable both speakers to be driven by
one source out of the speaker jack. If you are connecting the speaker jack output to
an amplifier, insert some attenuation in between. The speaker jack output signal may
be too strong for the amplifier.
The voice input/output device selection is controlled by voice AT commands. Use
AT+VLS=8
to select the external microphone and
AT+VLS=16
to select the mo-
dem internal speaker as input or output device. The external speaker simply physi-
cally replaces the internal speaker, and the device selection remains the same.
Usually, the user makes input/output device selection through application software
packages according to the program's instructions and the user doesn't need to worry
about using commands to make a selection.
Non-volatile Memory
The Elite 2864 series modem uses a 16Kbit EEPROM for parameter storage, which
is four times larger than that of the U-1496 series. There are four user profiles of
which each includes 128 S-registers (
S0
to
S127
). 50 phone numbers and 50 pass-
words can be stored.