Siemens SCALANCE W786-xPRO Operating Instructions Manual page 244

Glossary
The IP address is made up of two parts, the network ID and the host ID. This allows different
subnets to be created. Depending on the bytes of the IP address used as the network ID and
those used for the host ID, the IP address can be assigned to a specific address class:
Address Class
O
B
C
D
iPCF
The industrial Point Coordination Function is a communications protocol with which data
traffic between the access point and connected stations is controlled to avoid collisions.
Using iPCF, the data throughput can be optimized even with a high number of nodes. iPCF
also allows fast cell changes.
PST
Primary Setup Tool
QoS
Quality of Service (QoS) is a general term that indicates the correct functionality of all
interactive components of a telecommunications network. Depending on the communications
standard (for example IP), error parameters are detected and recorded with which the
operation of the technology is continuously monitored and that form the basis for any
244
Address class identifier
Byte 1 (possible value 1 - 126)
(Byte 1 is the byte furthest left.)
Byte 1
(possible value 128 - 191)
Byte 2
(possible value 0 - 255)
Byte 1
(possible value 192 - 223)
Bytes 2 and 3
(possible value in each case 0 -
255)
Byte 1
(possible value 224 - 239)
multicast addresses
Operating Instructions, Release 08/2007, C79000-G8976-C221-02
Network address and node
address
Byte 2 to byte 4
Possible value in each case 0 -
255.
0.0.0 must not be assigned,
255.255.255 is the broadcast
address.
Byte 3 and byte 4
Possible value in each case 0 -
255.
0.0 must not be assigned,
255,255 is the broadcast
address.
Byte 4
Possible value 1 - 254.
0 must not be assigned, 255 is
the broadcast address.
Byte 2 to byte 4
Possible value in each case 0 -
255
0.0.0 must not be assigned.
There are several multicast
addresses with a special
meaning, for example
224.0.0.1
All systems of the subnet
224.0.0.2
All routers of the subnet
SCALANCE W786-xPRO