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Office
Administrator’s Guide
Private VLAN
Private VLANs allow the separation of physical ports in an Ethernet switch
to different groups.
Two ports belonging to different Private VLANs cannot
communicate with each other but can access another network (e.g.
the
broadband access) through the "uplink" port.
Protocol
A set of rules governing the transmission of data. In order for a data transmission
to work, both ends of the connection have to follow the rules of the protocol.
PSK
Pre-Shared Key
A shared password which was previously shared between two parties using some
other secure communications channel before it needs to be used.
PSTN
Public Switched Telephone Network
The circuit-switched telephone network supporting the standard analog tele-
phony service (POTS).
Public IP
An IP address that can be accessed from the Internet. Administration of public
IP addresses, so that two devices connected to the public network don’t use
the same IP address or that two networks don’t have the same network address,
is done by IANA (Internet Assigned Numbers Authority).
IANA makes sure to
provide unique IP network addresses to Internet Service Providers (ISPs) and
keeps track of their usage. Users are assigned IP addresses by ISPs. Compare
with Private IP.
PVC
Permanent Virtual Circuit
A point-to-point circuit from the Customer Premise Equipment (CPE) to either
their Internet Service Provider (ISP) or Enterprise Network. Over the ATM network
(used in ADSL access networks) each PVC circuit is primarily identified by a VPI
and VCI pair of values.
QoS
Quality of Service
QoS is a scheme that involves a wide of set of standards and mechanisms for
ensuring high-quality performance for critical applications.
RDNSS
Recursive DNS server option gives the possibility to assign a server which provides
a recursive DNS resolution service for translating domain names into IP addresses
through the Router Advertisements packets.
Registration
The periodic communication process between a SIP endpoint and a SIP proxy.
Using this procedure, the endpoint notifies the proxy about its existence and
authenticates itself in order to be able to place and receive calls.
Remote
In a physically separate location. For example, an employee away on travel
who logs in to the company’s intranet is a remote user.
Repeater
In telecommunication networks, a repeater is a device that receives a signal
on an electromagnetic or optical transmission medium, amplifies the signal, and
then retransmits it along the next leg of the medium. Repeaters overcome the
attenuation caused by free-space electromagnetic-field divergence or cable
loss.
A series of repeaters make possible the extension of a signal over a
distance.
In addition to strengthening the signal, repeaters also remove the
"noise" or unwanted aspects of the signal.
Gennet s.a.
226