Allied Telesis AR400 Series Router - Manual (Page 40)

40 AR400 Series Router
613-000313 Rev B
Connection to ISDN network
This product is supplied with an approved patch cord for connection to the ISDN
Basic Rate Network.
Ports for the connection of other apparatus
The following interfaces normally operate at Safe Extra Low Voltage (SELV) 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 42.4V peak a.c. or 60V d.c.
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.
TNV3
The following interface is a Telecommunications Network Voltage (TNV3) circuit,
which operates normally in excess of the limits of SELV:
■ xDSL ports for connection to xDSL services
Note A TNV3 circuit is a circuit which under normal operating conditions exceed
the limits for SELV and on which overvoltages from telecommunication networks are
possible.