Panasonic KX-TDA0480 Installation Manual page 169

Operation data
Operation data is a type of office data. It includes a general class of data related to Voice
Control Basic Module (VBM), Domain Name System (DNS), and Simple Network
Management Protocol (SNMP).
Pad control
A digital pad is inserted in a speech path to adjust the level of a speech signal to some
optimum value. The insertion of a pad value is done on a Line basis.
PCM (Pulse Code Modulation)
The most common digitisation technique for encoding an analogue voice signal into a
digital bit stream. The most common PCM method is to sample a voice conversation at 8000
times per second. The theory is that if the sampling is at least twice the highest frequency
on the channel, which produces satisfactory voice tones.
Port number
A port number is a logical number that manages the category of service supported and
resources used in the TCP/UDP protocol. The port number is referred to when setting the
priority control of a router.
Priority connection information
In the KX-TDA0480, DNS information stored in the unit is referred to as priority
connection information.
Priority control
When a packet to which a high priority indication flag has been assigned is sent, the packet
is transferred with priority. The priority control function is used in a router or an exchange
in order to minimise delay time. Voice or fax communication, in a network not using
priority control, may be interrupted when network traffic increases.
Private address
IP address assigned within a closed network of each organisation that will not be connected
to the Internet.
PSTN
Public Switched Telephone Network
Q.931
H.323 signalling protocol for setup and termination of calls.
Installation Manual
Glossary
169