Motorola 3460 ユーザーズマニュアル

ページ / 188
3460 Fast’R
C-19
Status LEDs
Cards and stand-alone modems have the following front panel 
indicators. On a dual-modem card, each modem has a set of indicators. 
Vanguard 3460 V.34 Daughtercard modems have only the MR and OH 
indicators
.
Status LED Displays
 
LED
Description
MR
Modem Ready/
Test Mode
• On: modem is ready to interwork with computer
• Flashing: Modem is in V.54 test mode
TR 
Transmit/Receive
(Data Terminal 
Ready)
On: computer is asserting DTR (Circuit 108) to modem
OH
Off Hook (con-
nected to phone 
line)/
Ring Indicator
On
• Regular operation: modem is connected to dial line
• Restoral operation: when regular operation is 
configured for leased-line or dial-line operation, and 
modem is operating on restoral dial line: modem is 
connected to dial line
Flashing: modem receiving Active Ring 
Off
• In dial configuration: no call in progress, modem is 
disconnected from telephone line
• In leased-line configuration: modem is connected to 
leased line
CD
DataCarrier Detect
On: modem is receiving a valid carrier signal from a 
remote modem
RD
Receive Data
Flashing: modem is transferring data received from a 
remote modem and command responses to computer
SD
Send Data
Flashing: modem receiving transmit data and 
commands from computer