RAD Data comm RSD-20 operation manual Main channel is DCE and sub-channels are mixed DTE and DCE

RSD-20 OPERATOR'S MANUAL INSTALLATION

2.5.2.4Main channel is DCE and sub-channels are mixed (DTE and DCE)

In this mode one of the modems attached to the sub-channels (configured as DTE) should be attached to sub-channel 1, and the RSD baud rate should be strapped to CLK-1.

The DTEs attached to the main and sub-channels are synchronized to the RSD’s clock; the modems attached to the sub-channels are synchronized to their own clock; and the internal buffer compensates for the phase difference between the signal timing of the modem attached to sub-channel 1 to the rest of the modems.

NOTE	1.	Working with RSD’s internal clock is also possible but CLK-1 is
		preferred.
	2.	On DTE (sub-channels 1 to 4 and Main channel), the RSD-20 supplies
		clock on pins 7 and 14 for DCE external clock (The DCE must support
		external clock as in the ASM-20/8-X.21).
WARNING	Before plugging in this unit, the protective ground (earth) terminals must
	be connected to the protective conductor of the (mains) power cord. The
	mains plug should only be inserted in a socket outlet provided with a

protective ground (earth) contact. The protective action must not be negated by use of an extension cord (power cable) without a protective conductor (grounding).

Ensure that only fuses with the required rated current, and specified type (slow blow, 0.4A) are used for replacement. The use of repaired fuses, and the short-circuiting of fuse holders is strictly forbidden.

Whenever it is likely that the protection offered by fuses has been impaired, the instrument must be made inoperative and secured against unintended operation.

With the unit power turned on, operating personnel are not exposed to voltages in excess of 30 volts on any I/O pin, provided that the equipment to which the RSD-20 is connected is safe.

2.9