Glossary - WAGO 750 Series Manual

230 • Glossary

12 Glossary

B
Bit
Smallest information unit. Its value can either be 1 or 0.
Bit rate
Number of bits transmitted within a time unit.
BootP
the bootstrap protocol is a protocol which specifies how system and network
information is to be transmitted from a server to work stations.
Bridge
A network bridge serves to transmit messages independent of the destination
of the message. It operates at the data link layer (layer 2) of the ISO/OSI
model.
Bridges divide networks into segments which allows to increase the number
of nodes. Incomplete telegrams are removed. Telegrams are only sent if the
node's target address is in the connected segment. A bridge creates a data
base which contains all station addresses (MAC addresses). On the basis of
this data, the bridge decides whether or not the received data packets are
forwarded to another network segment. By and by, the bridge will be better
able to decide in which segment the data belongs. Today, switches are often
used instead of bridges.
Broadcast
A message that is sent to all station connected to the network.
Bus
Line for bit serial or bit parallel clocked data transfer. A bus for bit parallel
data transfer consists of address, data, control and supply bus. The width of
the data bus (8, 16, 32, 64 bits) and its frequency are the determining factors
for the data transmission speed. The width of the address bus limits the
network expansion.
Byte
Binary Yoked Transfer Element. A byte generally contains 8 bits.
WAGO-I/O-SYSTEM 750
Linux Fieldbus Coupler