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2.7
Modem LED Indicators
The MT2834BLR has ten LED diagnostic indicators. They are:
1. Receive Data (RCV). This LED blinks when data is being received, on for a space, off for a mark.
The state of this RCV LED matches that of the RCV circuit on Pin 3 of the RS-232C/V.24
interface.
2. Transmit Data (XMT). This LED blinks when data is being transmitted, on for a space, off for a
mark. The state of this LED matches that of the XMT circuit on Pin 2 of the RS-232C/V.24
interface.
3. Carrier ON (CO). This LED lights when a valid carrier tone has been detected.
4. 28,800 bps (28.8). This LED is lit when the modem is connected at 28,800 bps.
5. 14,400 bps (14.4). This LED is lit when the modem is connected at 14,400 bps. Note that when
both 28.8 and 14.4 LEDs light, modem is in 21,600-26,400 bps mode of operation.
6. 2400 bps (24). This LED is lit when the modem is connected at 2400 bps.
7. Off Hook (OH). This LED is lit when the phone line is "off hook". This occurs when the modem is
dialing, on line, or answering a call. The LED also flashes when the modem is pulse dialing in the
Command Mode.
8. Data Terminal Ready (DTR). When the DTR LED is lit, the modem is permitted to answer an
incoming call. When DTR goes off, a connected modem disconnects if dependent on DTR. The
state of this DTR LED matches that of the DTR circuit on Pin 20 of the RS-232C/V.24 interface.
9. Ring Indicator (RI). This LED is lit during the ringing interval as an incoming call is received.
10. Error (ERR). When the ERR LED is flashing, the leased line is down and the modem is in self-
test mode has failed. When ERR LED is on, this indicates the modem is in an out of service
(OOS) state. When the modem is out of service, it is busy to incoming calls.
NOTE: To verify if you are engaged in Enhanced V.34 mode first type +++AT<CR>(on-line escape
command while maintaining command mode), then type ATL8. The L8 command displays the
current on-line CONNECT status of the MT2834BLR. What then displays on your monitor is your
modem's current on-line condition (i.e., DSP and Firmware version, Link Type, Line Speed, Serial
Speed, Type of Error Correction/Data Compression, Number of past Retrains,etc.).
Chapter 2 - Installation and Connection
17
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