ZyXEL Communications U-1496 series User Manual page 17

LED Indicators
HS High Speed indicator, lights up when modem is in V.32 or
V.32bis mode. Dialing indicator, flashes one second on and one
second off when dialing. Retrain indicator, flashes half second
on and half second off when modem is in retrain.
AA Auto-Answer indicator, lights up when modem is in the Auto
Answer mode; flashes when modem rings.
CD Carrier Detect indicator, lights up when a valid carrier is
present on the line.
OH Off-Hook indicator, lights up when modem is in data mode or
off-hook. It goes out when modem is in voice mode or on-hook.
DTR Data Terminal Ready indicator, lights up when the DTE or
computer indicates that it is ready for communication.
DSR Data Set Ready indicator, lights up when modem is ready for
communication.
CTS Clear To Send indicator, lights up when modem can accept
data for transmission.
TXD Transmit Data indicator, lights up when the DTE/ computer is
transmitting data on the serial port.
RXD Receive Data indicator, lights up when the DTE/computer is
receiving data on the serial port.
EC Error Control indicator, lights up when modem is operated in
an error control mode like MNP-4 or V.42. Data compression mode
(V.42bis or MNP 5) implies error control mode. Retransmission
indicator, lights up when retransmitting.
SQ Signal Quality indicator, lights up when signal quality is
good; flashes when it is on margin. At power-on it flashes to
indicate error, refer to Chapter 17 for details.
TST Test indicator, lights up when modem is in a test mode.
U-1496E FRONT PANEL SWITCHES
VOICE/DATA
A toggle switch that toggles the modem on-line (off-hook, DATA
mode) or off-line (on-hook, VOICE mode, the telephone set is
connected to the line). If the S35 bit 4 is set (S35.4=1),
pressing this switch will make the modem go off-hook and dial the
default number.
ANS/ORG
A locked switch, it determines if the modem is in originate mode
or answer mode when the modem goes off-hook by toggling the
VOICE/DATA switch. Locked up position means answer mode and
locked down position means originate mode.
Note: This switch determines on-line mode only when manual
off-hook. ATD or ATA command will automatically determine the
mode.
U-1496E REAR PANEL MARKINGS
Fig. 3-6 shows the rear panel of U-1496E. The rear panel markings
are the same as those of the U-1496 in Fig. 3-2 except that