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256-KBPS LINE DRIVER (V.35, RS-530, OR X.21)
Table 5-2. The indicators.
The item numbers in this table correspond to Figures 5-1 and 5-2.
ITEM INDICATOR FUNCTION
1 PWR Green LED is on when power is on.
2 RTS Yellow LED is on when terminal activates Request to Send.
3 TD Yellow LED is on when steady SPACE is being transmitted. It flickers
when data is transmitted.
4 RD Yellow LED is on when steady SPACE is being received. It flickers
when data is received.
5 DCD Yellow LED is on when a valid receive signal is present.
6 TEST Red LED is on when the LMD-MR256 is in any of the loopback modes.
7 ERR LED goes ON when PATT switch is activated and then dims. If there are
errors in the test pattern, the LED blinks or remains ON.
5.2 Operating Procedure
The line driver operates entirely unattended, although we recommend that you
monitor its LEDs occasionally. To turn the unit off, you must unplug its power
cord from the outlet—it has no power switch.
If you want to reconfigure the line driver for a different type of operation, make
very sure to unplug the unit first. After the unit is powered down, change the
settings of its internal controls as necessary, following the instructions in
Section 3.3.