Multi-Tech Systems MULTIMODEM MT2834ZDX - Manual (Page 7)

Chapter 2 – Operation
Multi-Tech Systems, Inc. MT2834ZDX User's Guide 7
Chapter 2 – Operation
Front Panel
The MT2834ZDX has ten LED indicators on the front panel that indicate status, configuration, and activity:
Transmit Data. The TD LED lights when the modem is transmitting data to another modem. The state of the LED
matches the TD circuit on pin 2 of the RS-232C/V.24 interface.
Receive Data. The RD LED lights when the modem is receiving data from another modem. The state of the LED
matches that of the RD circuit on pin 3 of the RS-232C/V.24 interface.
Carrier Detect. The CD LED lights when the modem detects a valid carrier signal from another modem. It is on when
the modem is communicating with the other modem and off when the link is broken.
33,600 bps. The 33 LED lights by itself when the modem connects 33,600 bps operation. This LED also lights or
blinks in combination with the 14 LED to indicate speeds between 16,800 and 26,400 bps (see table).
14,400 bps. The 14 LED lights by itself when the modem connects at 14,400 bps. The 14 LED lights or blinks in
combination with the 28 LED to indicate speeds between 16,800 and 26,400 bps. It lights together with the 96 LED to
indicate a speed of 12,000 bps.
9600 bps. The 96 LED lights when the modem connects at 9600 bps. If no speed LED lights, the modem is operating
at less than 9600 bps.
Off-Hook. The OH LED lights when the modem is off-hook, which occurs when the modem is dialing, online, or
answering a call. The LED flashes when the modem pulse-dials.
Terminal Ready. The TR LED lights when a datacomm program initializes the modem. It means the modem is ready
for an outgoing or incoming call. It goes off when the datacomm program disconnects the COM port. When it goes
off, a connected modem will disconnect. The state of the TR LED matches that of the DTR circuit on pin 20 of the RS-
232C/V.24 interface.
Error Correction (V.42). The EC LED lights continuously when the modem is in error correction mode, and blinks
when compression is activated.
Fax. The FX LED lights when the modem is in fax mode.
Note: When you turn on the MT2834ZDX, the speed lights flash briefly as the modem does a self-test, then the LED
for the default modem baud rate lights. The default rate for the MT2834ZDX is 28,800 bps (33,600 bps for the ZDXb)
unless you select and store another baud rate. After a call, the LEDs for the connection’s baud rate remain lit until
another call is made or the modem is reset. If you connect at a rate under 9600 bps, all speed LEDs remain off after
the connection is broken, even though the modem is still turned on.
Speed Indicator Blink Rates
The 33, 14, and 96 speed indicators light singly or in combination to indicate data rates.