Specifications

Chapter 2 — Hardware Settings
Data/Fax Rack Mounted Modem Card Configuration Guide 9
LED Indicators
The MT5600BR-V92 has ten LED diagnostic indicators.
LED
Description
RCV
Blinks while receiving data. The RCV LED state matches that of the RCV circuit on Pin 3 of the
RS232C/V.24 interface.
XMT
Blinks while transmitting data. The XMT LED state matches that of the XMT circuit on Pin 2
of the RS232C/V.24 interface.
CO
Lights when a valid carrier tone has been detected.
56
Lights when the modem connects using V.92 protocol. Actual connection speed depends on
ISP server capabilities and line conditions.
33.6
Lights when the modem connects at 33,600 bps.
1
14.4
Lights when the modem connects at 14,400 bps.
1
OH
Lights when the phone line is off-hook. This occurs when the modem is dialing, on line,
answering a call, or when the OOS toggle is set to BUSY.
This LED flashes when the modem is pulse dialing in the Command Mode.
DTR
When the DTR LED is lit, the modem is permitted to answer an incoming call. When the DTR
LED is off, if the modem is dependent on DTR, it disconnects. The state of this DTR LED
matches that of the DTR circuit on Pin 20 of the RS232C/V.24 interface.
RI
Lights during the ringing interval when incoming call is received.
OOS
When the OOC LED is on, the modem is in an out of service (OOS) state. When the modem is
out of service, it is busy to incoming calls.
1
If both the 33.6 and 14.4 LEDs are lit, the modem is operating in the 16,800 to 33,600bps mode.