Allied-telesis Rapier 48w Switch Instrukcja Użytkownika Pobierz pdf (Strona 22)

Rapier 48w Switch

5. Remove the telephone cord from the unit prior to making changes to the

expansion port.

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Connection to ISDN network

Ports for the connection of other apparatus

The following interfaces normally operate at SELV (Safe Extra Low Voltage)

levels:

■ Asynchronous (console) ports

■ Ethernet ports

■ G703 ports

■ Synchronous ports

Note SELV is a secondary circuit whose voltages do not exceed a safe value

under normal operating conditions and under single fault conditions. Under

normal operating conditions the voltages do not exceed 42.4 V peak AC or

60 V DC.

TNV1

The following interfaces are Telecommunications Network Voltage (TNV1)

circuits, which operate normally within the limits of SELV:

■ BRI ports for connection to ISDN Basic Rate telecommunications networks

■ PRI ports for connection to ISDN Primary Rate telecommunications

networks

■ E1/T1 ports for connection to E1/T1 services

Note A TNV1 circuit is a circuit which under normal operating conditions does

not exceed the limits for SELV and on which overvoltages from

telecommunication networks are possible.

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Allied-telesis Rapier 48w Switch Instrukcja Użytkownika Strona 22