Terms - SSS Siedle DoorCom IP DCIP 600-0 Manual

3 Group calculation
Max. number of PC users
For calculation of the maximum
number of possible PC users (single
and parallel calls), the following rules
are applied:
• In general, an IPVS can manage a
maximum of 50 registrations.
• Every PC user to which a door call
has been established currently occu-
pies 2 registrations in the IPVS.
• If no groups are created, a
maximum of 49 single PC users can
be integrated. If one of these PC
users is called, it currently occupies 2
registrations, the others occupy only
one each. In total, this adds up to
1*2+48=50, which is the maximum
possible assignment per IPVS.
• If several groups are created, the
biggest group is decisive for the
calculation. The maximum group
size is 25. If this group is called,
each PC user currently occupies 2
registrations. In total, this adds up
to 25*2=50, which is the maximum
possible assignment per IPVS.
In the following is a list with five
combinations. Each example compri-
ses a group with a different number
of users and individual clients.
Clients Individual Calculation
in group Clients
5 40 5*2+40=50
10 30 10*2+30=50
15 20 15*2+20=50
20 10 20*2+10=50
25 0 25*2+0=50
Example in case of several
groups:
The following is a combination
example comprising two groups
and five individual clients, with each
group and each individual client
occupying one address. Consequent-
ly a total of seven addresses are used
in the system.
Group 1: 20 PC users
Group 2: 5 PC users
Clients: 5 individual PC users
• If the biggest group (group 1) is
called, this group occupies 20*2=40
registrations in the IPVS. Group 2
6
and the individual PC users each
occupy 5 registrations. In total, this
adds up to 20*2+5+5=50, which is
the maximum possible assignment
per IPVS.
For parallel calls to groups, note the
section on multicasting, page 31.

3 Terms

Client
PC user connected to a network.
Full duplex
Both users (PC client and door
station) have an unrestricted
speech connection. Open duplex
communication, i.e. as opposed to
the simplex speech mode.
Gateway
Gateways link two different
networks and create connections
across network boundaries. During
this process, both the physical
transmission modes and also
protocols and addresses are adjusted
accordingly.
Half duplex
Two speaking users have one speech
connection which they can use
alternately, also known as push to
talk.
HTTP
The Hypertext Transfer Protocol is a
protocol used for the transmission
of data via a network. It is used
mainly to load websites and other
data from the Internet into a web
browser.
Hub
The term hub when used in relation
to network technology describes a
device which links network nodes in
a star formation. Normally, the term
hub is used to denote a multiport
repeater. It is used in order to link
network nodes or other hubs, for
example by means of an Ethernet.
IP address
Internet Protocol address
An IP address is a number which
permits PCs and other devices in
an IP network to be addressed. In
technical terms, the number is a
32- or 128-bit binary number.
IP
Internet Protocol
The IP is a network protocol in
widespread use in computer
networks. IP forms the first layer of
the Internet protocol family which