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User’s Manual of WGSW-20160HP
8. Power over Ethernet Overview
What is PoE?
The PoE is an abbreviation of Power over Ethernet; the PoE technology means a system to pass electrical power safely, along
with data on Ethernet UTP cable. The IEEE standard for PoE technology requires Category 5 cable or higher for high power
PoE levels, but can operate with category 3 cable for low power levels. Power is supplied in common mode over two or more of
the differential pairs of wires found in the Ethernet cables and comes from a power supply within a PoE-enabled networking
device such as an Ethernet switch or can be injected into a cable run with a mid-span power supply.
The original IEEE 802.3af-2003 PoE standard provides up to 15.4 W of DC power (minimum 44 V DC and 350mA) to each
device. Only 12.95 W is assured to be available at the powered device as some power is dissipated in the cable.
The updated IEEE 802.3at-2009 PoE standard also known as PoE+ or PoE plus, provides up to 25.5 W of power. The 2009
standard prohibits a powered device from using all four pairs for power
The 802.3af / 802.3at define two types of source equipment: Mid-Span and End-Span.
Mid-Span
Mid-Span device is placed between legacy switch and the powered device. Mid-Span is tap the unused wire pairs 4/5 and 7/8 to
carry power, the other four is for data transmit.
End-Span
End-Span device is direct connecting with power device. End-Span could also tap the wire 1/2 and 3/6.
PoE System Architecture
The specification of PoE typically requires two devices: the Powered Source Equipment (PSE) and the Powered Device (PD).
The PSE is either an End-Span or a Mid-Span, while the PD is a PoE-enabled terminal, such as IP Phones, Wireless LAN, etc.
Power can be delivered over data pairs or spare pairs of standard CAT-5 cabling.
Powered Source Equipment (PSE)
Power sourcing equipment (PSE) is a device such as a switch that provides (sources) power on the Eth
ernet cable. The
maximum allowed continuous output power per cable in IEEE 802.3af is 15.40 W. A later specification, IEEE 802.3at, offers
25.50 W. When the device is a switch, it is commonly called an End-span (although IEEE 802.3af refers to it as endpoint).
Otherwise, if it's an intermediary device between a non PoE capable switch and a PoE device, it's called a Mid-span. An
external PoE injector is a Mid-span device
.
Powered device
A powered device (PD) is a device powered by a PSE and thus consumes energy. Examples include wireless access points, IP
Phon
es, and IP cameras. Many powered devices have an auxiliary p
ower connector for an optional, external, power supply.
Depending on the PD design, some, none, or all power can be supplied from the auxiliary port, with the auxiliary port sometimes
acting as backup power in case of PoE supplied power failure.
How Power is Transferred Through the Cable
A standard CAT5 Ethernet cable has four twisted pairs, but only two of these are used for 10BASE-T and 100BASE-TX. The
specification allows two options for using these cables for power, shown in Figure 1 and Figure 2:
The spare pairs are used. Figure 1 shows the pair on pins 4 and 5 connected together and forming the positive supply, and the
pair on pins 7 and 8 connected and forming the negative supply. (In fact, a late change to the spec allows either polarity to be
used).
531
- TABLE OF CONETNTS 3
- 1. INTRODUTION 21
- 1.3 How to Use This Manual 24
- 1.4 Product Features 25
- 1.5 Product Specification 28
- 2. INSTALLATION 31
- 2.1.2 LED Indications 32
- 2.1.3 Switch Rear Panel 33
- 2.2 Install the Switch 34
- 2.2.2 Rack Mounting 35
- 3. SWITCH MANAGEMENT 39
- 3.3 Administration Console 40
- Direct Access 41
- 3.4 Web Management 42
- 4. WEB CONFIGURATION 45
- 4.1 Main Web Page 48
- 4.2 System 50
- 4.2.1 System Information 51
- 4.2.2 IP Configuration 52
- 4.2.3 IPv6 Configuration 53
- 4.2.4 Users Configuration 54
- Add / Edit User 55
- 4.2.5 Privilege Levels 57
- 4.2.6 NTP Configuration 59
- 4.2.7 UPnP 60
- 4.2.8 DHCP Relay 61
- 4.2.9 DHCP Relay Statistics 63
- 4.2.10 CPU Load 65
- 4.2.11 System Log 66
- 4.2.12 Detailed Log 67
- 4.2.13 Remote Syslog 68
- 4.2.14 SMTP Configuration 69
- 4.2.15 Web Firmware Upgrade 70
- 4.2.16 TFTP Firmware Upgrade 71
- 4.2.17 Configuration Backup 71
- 4.2.18 Configuration Upload 74
- 4.2.19 Image Select 75
- 4.2.20 Factory Default 76
- 4.2.21 System Reboot 77
- 4.3.1 SNMP Overview 78
- 4.3.5 SNMPv3 Configuration 83
- 4.4 Port Management 89
- 4.4.3 Port Statistics Detail 92
- 4.4.4 SFP Information 94
- 1000Base-SX 94
- 1000Base-LX 94
- 100Base-FX 94
- 4.4.5 Port Mirror 95
- Mirror Port Configuration 96
- 4.5 Link Aggregation 98
- 4.5.1 Static Aggregation 100
- 4.5.2 LACP Configuration 102
- 4.5.3 LACP System Status 104
- 4.5.4 LACP Port Status 105
- 4.5.5 LACP Port Statistics 106
- 4.6 VLAN 107
- 4.6.2 IEEE 802.1Q VLAN 108
- 4.6.3 VLAN Basic Information 111
- 4.6.5 VLAN Membership 116
- 4.6.6 VLAN Membership Status 117
- 4.6.7 VLAN Port Status 119
- 4.6.8 Private VLAN 120
- 4.6.9 Port Isolation 122
- 4.6.10 VLAN setting example: 124
- 4.6.10.3 Port Isolate 129
- 4.6.11 MAC-based VLAN 130
- 4.6.12 MAC-based VLAN Status 131
- 4.6.13 IP Subnet-based VLAN 132
- 4.6.14 Protocol-based VLAN 133
- 4.7 Spanning Tree Protocol 136
- 4.7.3 Bridge Status 144
- 4.7.5 MSTI Priorities 148
- 4.7.6 MSTI Configuration 149
- MSTI Port Configuration 151
- MSTx MSTI Port Configuration 152
- 4.7.8 Port Status 153
- 4.7.9 Port Statistics 155
- 4.8 Multicast 156
- Type Response Time 158
- 4.8.5 IGMP Snooping Status 165
- 4.8.6 IGMP Group Information 166
- 4.8.7 IGMPv3 Information 167
- 4.8.11 MLD Snooping Status 173
- 4.8.12 MLD Group Information 174
- 4.8.13 MLDv2 Information 175
- 4.8.15 MVR Status 179
- 4.8.17 MVR SFM Information 181
- 4.9 Quality of Service 183
- 4.9.2 Port Policing 184
- 4.9.3 Port Classification 185
- 4.9.4 Port Scheduler 187
- 4.9.5 Port Shaping 188
- 4.9.6 Port Tag Remarking 190
- 4.9.7 Port DSCP 192
- 4.9.8 DSCP-Based QoS 194
- 4.9.9 DSCP Translation 196
- 4.9.10 DSCP Classification 198
- 4.9.11 QoS Control List 199
- 4.9.12 QCL Status 203
- 4.9.14 QoS Statistics 205
- 4.9.16 Voice VLAN OUI Table 208
- 4.10 Access Control Lists 209
- 4.10.3 ACE Configuration 213
- IP Parameters 217
- IPv4 frame 218
- Ethernet Type Parameters 221
- 4.11 Authentication 225
- System Configuration 231
- Port Configuration 234
- Port State 242
- Port Counters 243
- 4.11.7 RADIUS Overview 252
- 4.11.8 RADIUS Details 254
- 4.12 Security 269
- 4.12.2 Access Management 273
- 4.12.4 HTTPs 275
- 4.12.5 SSH 276
- 4.12.6 Port Security Status 277
- 4.12.7 Port Security Detail 279
- 4.12.8 DHCP Snooping 280
- 4.12.12 ARP Inspection 286
- 4.13 Address Table 289
- 4.14 LLDP 295
- Fast start repeat count 298
- Coordinates Location 299
- Civic Address Location 300
- F RFC 2474) 301
- 4.14.4 LLDP-MED Neighbor 304
- 4.14.5 Neighbor 308
- 4.14.6 Port Statistics 309
- 4.15 Network Diagnostics 311
- 4.15.1 Ping 312
- 4.15.2 IPv6 Ping 313
- 4.15.3 Remote IP Ping Test 314
- 4.15.4 Cable Diagnostics 315
- 4.16 Power over Ethernet 317
- 4.16.2 System Configuration 319
- 4.16.3 Port Configuration 322
- 4.16.4 PoE Status 324
- 4.16.5 PoE Schedule 325
- 4.16.6 LLDP PoE Neighbours 327
- 4.17 Loop Protection 330
- 4.18 RMON 333
- 4.18.2 RMON Alarm Detail 335
- 4.18.3 RMON Alarm Status 336
- 4.18.5 RMON Event Detail 337
- 4.18.6 RMON Event Status 338
- 4.18.8 RMON History Detail 340
- 4.18.9 RMON History Status 341
- 5. COMMAND LINE INTERFACE 348
- Configure IP Address 349
- 5.2 Telnet Login 351
- 6. Command Line Mode 352
- 6.1 System Command 353
- 6.2 IP Command 359
- VLAN Status 383
- 6.7 Security Command 386
- Security AAA Statistics 440
- 6.9 Link Aggregation Command 452
- 6.11 LLDP Command 458
- 6.12 LLDPMED Command 462
- LLDPMED Policy Add 464
- 6.13 PoE Command 467
- QoS QCL Add 487
- 6.15 Mirror Command 490
- Mirror Mode 491
- 6.16 Configuration Command 492
- 6.17 Firmware Command 493
- 6.18 UPnP Command 494
- UPnP Advertising Duration 495
- 6.19 MVR Command 496
- 6.20 Voice VLAN Command 501
- 6.21 Loop Protect Command 506
- 6.22 IPMC Command 509
- IPMC Parameter URI 520
- 6.24 SMTP Command 526
- 7. SWITCH OPERATION 529
- 7.5 Auto-Negotiation 530
- What is PoE? 531
- 9. TROUBLE SHOOTING 533
- 12345678 536
- APPENDEX B : GLOSSARY 537
- EC Declaration of Conformity 555
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