Black Box ME445C-530, ME444AE-R3, ME445C-X.21, ME445C-35, ME444A-R3 Operating Procedure, Indicators

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.

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