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Chapter 3 – Operation
About the Front Panel
The LED indicators on the front panel indicate status, configuration, and activity:
TD – Transmit Data.
Flashes when the modem is transmitting data to another modem.
RD – Receive Data.
Flashes when the modem is receiving data.
CD – Carrier Detect.
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.
56 – 56K Mode (56,000–28,000 bps).
The actual connection speed depends on ISP server capabilities and line conditions.
33 – V.34 Mode (33,600–2,400 bps).
14 – V.32bis Mode (14,400–7,200 bps).
connect at lower than V.32bis speeds, but no speed indicator lights during the connection.
OH – Off-Hook.
Lights when the modem is off-hook, which occurs when the modem is dialing, online, or answering a
call. Flashes when the modem pulse-dials.
TR – Terminal Ready.
Lights when a communications program is using the modem. It means the modem is ready for an
outgoing or incoming call. It goes off when the communications program disconnects the serial port. When it goes
off, a connected modem will also disconnect.
EC – Error Correction (V.42).
compression is activated.
FX – Fax.
Lights when the modem is in fax mode.
Note:
When you turn on the modem, the protocol indicators flash briefly as the modem does a self-test, after which the
56 indicator lights. After a call, the indicator for the protocol used in the connection remains lit until another call is
made or the modem is reset. If you connect at a rate under 14,400 bps, all protocol indicators remain off after the
connection is broken, even though the modem is still turned on.
Multi-Tech Systems, Inc. MT5634ZBA-Series User Guide (S000286G)
Lights whenever the modem is set for or connects using the V.90 or V.92 protocol.
Lights whenever the modem connects using the V.34 protocol.
Lights when the modem connects using the V.32bis protocol. The modem can
Lights continuously when the modem is in V.42 error correction mode, and flashes when
Chapter 3 – Operation
14
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