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Important OSM/ESM Functions
2-14
Industrial Ethernet OSM/ESM Network Management
C79000-G8976-C137-08
2.12 Flow Control
Flow control is a mechanism that reduces the risk of data loss in the network
resulting from overload.
The OSM/ESM supports two flow control mechanisms:
S Half Duplex Flow Control (Back Pressure) for ports operating in the half
duplex mode. With this type of flow control, the OSM/ESM reduces the packet
rate received at a port if there is overload in the network by generating
additional collisions.
S Full Duplex Flow Control complying with the IEEE 802.3x standard for ports
operating in the full duplex mode. If there is overload, the OSM/ESM generates
pause packets that stop or re-enable the sending of new packets by the
connected partner device. This is only possible when the DTE supports full
duplex flow control.
Half and full duplex flow control can be activated separately for each port of the
OSM/ESM. If the OSM/ESM port is operating in the autonegotiation mode, the
devices automatically negotiate whether or not the full duplex flow control is
activated. It is also possible to deactivate flow control for all ports of the OSM/ESM
at the same time.
Note
As default, full duplex flow control is deactivated. If you activate this, remember
that this can delay time-of-day synchronization frames.
- Purpose of the Manual 6
- Scope of the Manual 6
- Notes for the Reader 7
- Finding Information 7
- Target Group 7
- Audience 8
- Further Support 9
- C79000-G8976-C137-08 10
- Introduction 13
- 1.1.1 Function 14
- Protocol 15
- Getting Information 15
- Making Settings 15
- 1.2.1 Signaling Concept 17
- 1.2.2 Network Management 17
- 1.3 Command Interpreter (CLI) 20
- 1.4 Setting the IP Addresses 20
- Important OSM/ESM Functions 21
- 2.1 Autonegotiation 22
- 2.2 Autocrossover 23
- Defaults 24
- Protected Settings 24
- Restore Factory Defaults 24
- 2.6 Locked Ports 28
- 2.7 Mirroring 29
- 2.8 Traps 30
- 2.9 E-Mail Function 31
- 2.10 Event Log Table 32
- 2.12 Flow Control 34
- 2.13 BOOTP/DHCP 35
- 2.15 TELNET 37
- Redundant Coupling 38
- 1 Fiber-optic cable (FO) 39
- 2 ITP XP standard cable 9/9 39
- 2.17 Observer Function 41
- Command Interpreter (CLI) 44
- 3.1 Overview 45
- 3.2 Password Protection 45
- 3.3 Installing the CLI 46
- 3.4 Login 47
- 3.5 CLI Commands 48
- CLI Menus and Description 49
- Start Menu 50
- System Menu 51
- Command CommentDescription 52
- OSM/ESM Menu 53
- Agent Menu 55
- Switch Menu 58
- Port Menu 60
- Service Menu 61
- Web-Based Management (WBM) 62
- 4.1 General Introduction 63
- 4.2 Requirements 64
- 4.3 Connecting 65
- Figure 4-2 “Login” Window 66
- Figure 4-3 WBM Startup Window 67
- Device Status Field 69
- Menu Tree 69
- Data Window 69
- 4.6 Management Menus 70
- 4.7 System 71
- 4.7.1 System Version Numbers 72
- Hardware 73
- Order Number 73
- Boot software 73
- Operative software 73
- MAC Address 73
- 4.7.2 System Restart 74
- 4.7.3 System Factory Defaults 75
- (restoring the defaults) 75
- 4.7.4 System Save & Load 76
- Log Table File 77
- Firmware File 77
- 4.7.5 Event Log Table 78
- 4.8 OSM/ESM Status 79
- Standby Status 80
- RM Status 80
- Power Line 1 80
- Power Line 2 80
- Fault Status 81
- 4.8.1 OSM/ESM Fault Mask 82
- Set New Values 83
- 4.8.2 OSM/ESM Standby Mask 84
- 4.8.3 OSM/ESM Counters 86
- 4.9 Agent Features 88
- E-Mail Address 92
- SMTP Server IP Address 92
- “From” Field 93
- 4.9.5 Agent ARP Table 95
- 4.9.6 Agent SNMP Counters 96
- 4.10 Switch Features 97
- Flow Control 98
- Set New Value 98
- 4.10.1 Current FDB Table 99
- Start with MAC 100
- Clear Address 100
- Next Values 100
- 4.10.2 Static FDB Table 101
- Entering a Multicast Address 105
- 4.11 Port Status 106
- Flow Ctrl 107
- 4.11.1 Port Configuration 108
- 4.12 Statistics Counters 110
- 4.12.1 Packet Size 111
- 4.12.2 Packet Type 112
- 4.12.3 Packet Error 113
- SNMP and RMON 114
- 5.1 SNMP 115
- 5.2 RMON 116
- 6.1 General Introduction 118
- Figure 6-1 119
- Figure 6-2 120
- Figure 6-3 120
- Figure 6-4 121
- Requirements 122
- Notes on Troubleshooting 124
- Internet Browser Settings 128
- Figure A-2 Trusted Sites 130
- A.2 Netscape Communicator 6.2 138
- Serial Port of the OSM/ESM 140
- Figure B-1 Properties Tab 142
- References 143
- Abbreviations/Acronyms 145
- Glossary 148
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