ZyXEL Communications RS-1612 manual RS-232 port, Power Switch, DC Power Terminals, AC-DC switch

6	RX	For use on four-wire leased line
		systems receiving line (R model only).
7	TX	Transmits for four-wire leased lines,
		transmits and receives for two-wire
		leased lines (R model only).
8	TX	Transmits for four-wire leased lines,
		transmits and receives for two-wire
		leased lines (R model only).

RS-232 port

This port is for uploading firmware and configuring the control card. Use a RS-232 serial cable to connect to a PC.

Power Switch

The power switch turns the rack and all of its modems on or off.

DC Power Terminals

The DC power terminals connect a DC-48V power source to the rack.

AC-DC switch

The AC-DC switch selects which power supply the rack uses.

Fuse

The 4 A, 250 V AC fuse provides over current protection to the rack, power supply, and all of its modems.

Power Socket

The power socket connects the power cord to the power supply.

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