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Chapter 3 - Operation
Multi-Tech Systems, Inc. MT5634ZBA-Series User Guide 15
Chapter 3 - Operation
About the Front Panel
The MultiModem V.92 Front Panel
The MultiModem V.90 Front Panel
The MultiModemZBA 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). Lights whenever the modem is set for or connects using the V.90 or
V.92 protocol. The actual connection speed depends on ISP server capabilities and line conditions.
33 – V.34 Mode (33,600–16,800 bps). Lights whenever the modem connects using the V.34 protocol.
14 – V.32bis Mode (14,400–12,000 bps). Lights when the modem connects using the V.32bis protocol. The
modem can 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). Lights continuously when the modem is in V.42 error correction mode, and
flashes when 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.