Voipac NetPhone NP210, Руководство пользователя

Страница: 32 / 34

32
10 Cleaning the unit
Follow the steps below to clean the unit:
1. Disconnect the unit from the power supply!
2. Clean with a soft cloth, moistened with water. Do not use any liquid or aerosol cleaning
mixtures!
3. After drying up, plug in the power supply!
11 Glossary
DHCP (Dynamic Host Configuration Protocol)
Protocol for dynamic host configuration. It supplies individual network computers with
configuration information, such as IP address, implicit DNS server address, etc…
Protocol of dynamic address assignment of the IP protocol. This technology has been used with
larger Internet connection networks. Without DHCP it would be necessary to assign to each
computer (including a new one) one IP address, which currently is both impossible and not
feasible. DHCP provides for central administration and IP assignment on the need-to-need basis.
DNS (Domain Name System)
System of domain names. A database, where each host name is assigned an IP address (or vice
versa).
DTMF (Dual Tone Multi Frequency)
H.323 Gatekeeper
A switchboard of all calls within the H323 network. Although not a required part of the network, it
provides very important services including addressing, authorisation and authentication of
terminals and gates, administration of capacities and permeabilities, billing and redirecting calls.
IP address
IP address is a unique 32-bit number that identifies a computer within the Internet. Each packet
sent via the Internet contains an information about the place of its origin (source IP address) and
its destination (final IP address).
IP -> IP
Making telephone calls within the IP network without using the Gatekeeper.
Jabber
Jabber is a system for sending short text messages via the Internet. (IM - instant messaging).
Network mask
Network mask divides the IP address into two parts: higher, which marks the network, and lower,
which marks the computer within this network. Mask writes the same way as the IP address (e.g.
255.255.255.0). All computers in one IP segment must have the same sub-network mask and the
same network part of the IP address.
NAT (Network Address Translation)
Using the NAT technology (IP address translation) it is possible to connect the local network to
the Internet through a single public IP address. The whole network then looks on the outside as