Technical data

www.westermo.com Theoretical and general applications 9
Router
..................................................................................................................................................................................................................... 124–125
Brouter .................................................................................................................................................................................................................................. 125
Hub ............................................................................................................................................................................................................................................ 125
Switch
......................................................................................................................................................................................................................................
126
Gateway ............................................................................................................................................................................................................................... 126
Firewall
...................................................................................................................................................................................................................................
126
Hub or Switch .................................................................................................................................................................................................................... 127
Different types of switches ............................................................................................................................................................................... 128
FRNT and Spanning Tree ....................................................................................................................................................................................
128
Ringswitch
.........................................................................................................................................................................................................................
129
FRNT0 ................................................................................................................................................................................................................................... 129
FRNT1
...................................................................................................................................................................................................................................
129
Time switches
..............................................................................................................................................................................................................
130
Switch functions ................................................................................................................................................................................................ 131–132
Prioritisation (QoS, Quality of Service) .................................................................................................................................. 131
Layer 2 priority
.......................................................................................................................................................................................................... 131
Layer 3 priority .......................................................................................................................................................................................................... 132
Head of Line blocking prevention
..........................................................................................................................................
133–143
VLAN
...................................................................................................................................................................................................................................... 134
IGMP/IGMP snooping ...................................................................................................................................................................................... 135
Time synchronised networks
................................................................................................................................................................ 136
SNTP/NTP
.......................................................................................................................................................................................................................
137
Time stamping via applications
................................................................................................................................................... 137
Time stamping using Ethernet drivers
.............................................................................................................................. 137
Time stamping on the physical layer
................................................................................................................................... 137
SNMP
...................................................................................................................................................................................................................................... 138
SNMP software .........................................................................................................................................................................................................
139
SNMP, SNMPv2 and SNMPv3 .............................................................................................................................................................
140
MIB
..............................................................................................................................................................................................................................................
141
OPC .......................................................................................................................................................................................................................... 141–143
Ethernet on the cable
....................................................................................................................................................................................
144–145
10 Mbit/s Ethernet .......................................................................................................................................................................................
144–145
Fast Ethernet
.........................................................................................................................................................................................................
144–145
Gigabit Ethernet ............................................................................................................................................................................................... 144–145
Glossary
.............................................................................................................................................................................................................................. 146–158