Abbreviations and Technical Terms
77
PBX
Abbreviation of "
P
rivate
B
ranch e
X
change."
Private telephone system that connects various internal devices with the
ISDN network.
PING
Abbreviation of "
P
acket
In
ternet
G
roper."
Program for testing if a connection can be set up to a defined
Æ
IP desti-
nation. In the course of a test, data is sent to the destination and then re-
turned to the source. A message documenting the success/failure of the
test is output along with additional information, where applicable, such as
transmission time.
Port
Ports are used in
Æ
IP networks to permit multiple simultaneous commu-
nication connections. Services are often assigned various different port
numbers for this purpose.
Proxy
A proxy server is a cache which stores information locally.
PSTN
P
ublic
S
witched
T
elephone
N
etwork (analog telephone network or analog
ports at digital network nodes including the international public telephone
network).
QoS
Abbreviation of "
Q
uality
o
f
S
ervice."
Describes the subjective, perceptible quality (service) of a voice connec-
tion over
Æ
IP networks. QoS properties include the packet loss rate, pack-
et delay, delay difference, reserved bandwidth, type of bit rate (variable,
constant or unspecified) and bit rate.
RAM
Abbreviation of "
R
andom
A
ccess
M
emory."
Memory with read/write access.
HiPath Password
Protects the settings for communication
with other HiPath devices.
SNMP Password
Protects against unauthorized access to the
Æ
SNMP server for fault evaluation.
Subscriber Password
Protects against unauthorized access to the
subscriber number of the optiPoint phone.
Password
Meaning
