RAD Data comm IPmux-11 Connection of Data and Telecommunications Cables, Ports Safety Status

The maximum permissible current capability of the branch distribution circuit that supplies power to the product is 16A. The circuit breaker in the building installation should have high breaking capacity and must operate at short-circuit current exceeding 35A.

Before connecting the DC supply wires, ensure that power is removed from the DC circuit. Locate the circuit breaker of the panel board that services the equipment and switch it to the OFF position. When connecting the DC supply wires, first connect the ground wire to the corresponding terminal, then the positive pole and last the negative pole. Switch the circuit breaker back to the ON position.

A readily accessible disconnect device that is suitably rated and approved should be incorporated in the building installation.

If the DC mains are floating, the switch must disconnect both poles simultaneously.

Connection of Data and Telecommunications Cables

Data and telecommunication interfaces are classified according to their safety status.

The following table lists the status of several standard interfaces. If the status of a given port differs from the standard one, a notice will be given in the manual.

Ports	Safety Status
V.11, V.28, V.35, V.36, RS-530,	SELV Safety Extra Low Voltage:
X.21, 10 BaseT, 100 BaseT,	Ports which do not present a safety hazard. Usually
Unbalanced E1, E2, E3, STM, DS-2,
	up to 30 VAC or 60 VDC.
DS-3, S-Interface ISDN, Analog voice
E&M

xDSL (without feeding voltage), Balanced E1, T1, Sub E1/T1

TNV-1 Telecommunication Network Voltage-1:

Ports whose normal operating voltage is within the limits of SELV, on which overvoltages from telecommunications networks are possible.

FXS (Foreign Exchange Subscriber)	TNV-2	Telecommunication Network Voltage-2:
		Ports whose normal operating voltage exceeds the
		limits of SELV (usually up to 120 VDC or telephone
		ringing voltages), on which overvoltages from
		telecommunication networks are not possible. These
		ports are not permitted to be directly connected to
		external telephone and data lines.
FXO (Foreign Exchange Office), xDSL	TNV-3	Telecommunication Network Voltage-3:
(with feeding voltage), U-Interface		Ports whose normal operating voltage exceeds the
ISDN
		limits of SELV (usually up to 120 VDC or telephone
		ringing voltages), on which overvoltages from
		telecommunication networks are possible.

Always connect a given port to a port of the same safety status. If in doubt, seek the assistance of a qualified safety engineer.

Always make sure that the equipment is grounded before connecting telecommunication cables. Do not disconnect the ground connection before disconnecting all telecommunications cables.