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Glossary | Gateway 400 User Guide
63
R
Reset Reset is a process to restore an electronic device to a predefined state.
Reset Device You can reset the Gateway 400 to the factory default state via the System |
Reset Device menu. All settings are lost, and all ongoing calls and Internet
connections are interrupted.
Restart The Gateway 400 can be restarted via the System | Reset Device menu. All
settings are retained, and all ongoing calls and Internet connections are inter-
rupted.
Router Routers are devices that support different network technologies and connect
different networks. A router splits a network into segments with the aim of
reducing the amount of data to be transmitted. At the same time, it also pro-
vides security functions between the different transfer locations. Routers
work with defined protocols such as TCP/IP and make decisions to optimize
the data transfer and choose the appropriate route.
S
SELV SELV interfaces (Safety Extra Low Voltage) care used in the Gateway 400 for
network connections via RJ45 sockets. RJ45 jacks are also used with TNV in-
terfaces. There is therefore a risk of confusion. Make sure that no TNV and
SELV interfaces are connected with one another. SELV devices are not protect-
ed against voltage spikes, which can lead to technical defects or hazards for
users. In the event of a mixup, the devices will not operate as intended. Cables
to SELV interfaces must not exit the building.
SIP The Session Initiation Protocol (SIP) is a network protocol for setting up, con-
trolling and terminating a VoIP connection. The protocol is described in RFC
3261 and specifies the flow of Internet telephony.
Subnet mask A subnet mask determines to which subnet an IP address belongs. An IP ad-
dress has two components: the network address and the computer address.
With the subnet mask, the computer can internally divide the IP address into
network number and computer number.
T
TCP/IP (Transmission Control Protocol / Internet Protocol) This protocol is used for
data transmission in local networks and over the Internet.
TNV TNV = Telecommunications Network Voltage. The ISDN ports of the Gateway
400 are designed as TNV-1 circuits and can be connected via RJ45 jacks.
RJ45 jacks are also used with SELV interfaces. There is therefore a risk of con-
fusion. Make sure that no TNV and SELV interfaces are connected with one
another. Make sure that only terminals that provide TNV-1 voltage or are in-
tended for operation with TNV-1 circuits are connected to the ISDN ports.
63


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