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.

Some SELV and non-SELV circuits use the same connectors. Use caution when connecting cables. Extra caution should be exercised during thunderstorms.

When using shielded or coaxial cables, verify that there is a good ground connection at both ends. The earthing and bonding of the ground connections should comply with the local codes.

The telecommunication wiring in the building may be damaged or present a fire hazard in case of contact between exposed external wires and the AC power lines. In order to reduce the risk, there are restrictions on the diameter of wires in the telecom cables, between the equipment and the mating connectors.

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RAD Data comm ASM-60 operation manual Connection of Data and Telecommunications Cables, Ports Safety Status
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ASM-60 specifications

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