Planet GSD-808HP User manual

8-Port 10/100/1000Mbps 802.3at PoE Desktop Switch
GSD-808HP / GSD-808HP2
User’s Manual

Trademarks
Copyright © PLANET Technology Corp. 2012.
Contents subject to revision without prior notice.
PLANET is a registered trademark of PLANET Technology Corp. All other trademarks
belong to their respective owners.
Disclaimer
PLANET Technology does not warrant that the hardware will work properly in all
environments and applications, and makes no warranty and representation, either
implied or expressed, with respect to the quality, performance, merchantability, or
tness for a particular purpose.
PLANET has made every effort to ensure that this User’s Manual is accurate;
PLANET disclaims liability for any inaccuracies or omissions that may have
occurred.
Information in this User’s Manual is subject to change without notice and does not
represent a commitment on the part of PLANET. PLANET assumes no responsibility
for any inaccuracies that may be contained in this User’s Manual. PLANET makes
no commitment to update or keep current the information in this User’s Manual,
and reserves the right to make improvements to this User’s Manual and/or to the
products described in this User’s Manual, at any time without notice.
If you nd information in this manual that is incorrect, misleading, or incomplete,
we would appreciate your comments and suggestions.
FCC Warning
This equipment has been tested and found to comply with the limits for a Class A
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with
the Instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at
his own expense.

CE Mark Warning
This is a Class A product. In a domestic environment, this product may cause radio
interference, in which case the user may be required to take adequate measures.
Energy Saving Note of the Device
This power required device does not support Standby mode operation.
For energy saving, please remove the power cable to disconnect the device from
the power circuit.
Without removing power cable, the device will still consuming power from the
power source. In the view of Saving the Energy and reduce the unnecessary power
consuming, it is strongly suggested to remove the power connection for the device
if this device is not intended to be active.
WEEE Warning
To avoid the potential effects on the environment and human health as a
result of the presence of hazardous substances in electrical and electronic
equipment, end users of electrical and electronic equipment should
understand the meaning of the crossed-out wheeled bin symbol. Do not
dispose of WEEE as unsorted municipal waste and have to collect such WEEE
separately.
Revision
PLANET 8-Port 10/100/1000Mbps 802.3at PoE Desktop Switch User's Manual
For Models: GSD-808HP & GSD-808HP2
Revision: 2.1 (JUNE, 2012)
Part No.: 2350-A35130-002

Table of Contents
1. Introduction................................................................................................. 5
1.1 Checklist................................................................................................ 5
1.2 Product Description................................................................................. 5
1.3 Features ................................................................................................ 6
1.4 Specication........................................................................................... 7
2. Hardware Description ................................................................................... 9
2.1 Front Panel ............................................................................................ 9
2.1.1 LED Indicators ............................................................................... 9
2.2 Rear Panel ............................................................................................10
2.3 Desktop Installation ...............................................................................11
2.4 Rack Mounting ......................................................................................12
2.5 Product Application ................................................................................14
2.5.1 Train Station................................................................................. 14
2.5.2 IP Ofce ......................................................................................15
2.6 Power over Ethernet Powered Device ......................................................16
3. Power over Ethernet Overview......................................................................17
4. Troubleshooting...........................................................................................20
Appendix A Networking Connection ..................................................................21
A.1 PoE RJ-45 Port Pin Assignments..............................................................21
A.2 Switch's Data RJ-45 Pin Assignments - 1000Mbps, 1000Base-T .................21
A.3 10/100Mbps, 10/100Base-TX ..................................................................22

5
1. Introduction
1.1 Checklist
Check the contents of your package for following parts:
GSD-808HP or GSD-808HP2 x 1l
User's Manual x 1l
19” Rack Mount Accessory Kit x 1l
Rubber Feet x 4l
Power Cord x 1l
If any of these pieces are missing or damaged, please contact your dealer
immediately, if possible, retain the carton including the original packing material,
and use them against to repack the product in case there is a need to return it to
us for repair.
1.2 Product Description
To fulll the demand of High Power PoE for network applications with Gigabit speed
transmission, the PLANET 802.3at PoE Gigabit Ethernet Switch family -GSD-808HP
and GSD-808HP2 is an ideal solution. Each 10/100/1000Mbps port of GSD-808HP
and GSD-808HP2 features IEEE 802.3af and High Power IEEE 802.3at Power
over Ethernet (PoE) that combines up to 130 Watts / 240 Watts power output
and data per port over one Cat.5E / 6 Ethernet cable, with totally 130 Watts
(GSD-808HP) / 240 Watts (GSD-808HP2) PoE budget on whole system, it is
designed specically to satisfy the growing demand of higher power consuming
network PD (powered devices) such as PTZ (Pan, Tilt & Zoom) / Speed Dome
network cameras, multi- channel (802.11a / b / g / n) wireless LAN access
points and other network devices by providing double PoE power than conventional
802.3af PoE currently.
The 8 Gigabit High Power PoE ports in the GSD-808HP / GSD-808HP2 support
both 802.3af and 802.3at PoE standards and allows users exibly connect standard
and high powered devices simultaneously, the GSD-808HP offering 130 Watts
PoE budget, eight 15.4 Watts IEEE 802.3af devices or four 30 Watts IEEE 802.3at
devices can be easily installed without the power-socket limitation. The GSD-
808HP2 offering 240 Watts PoE budget, eight 15.4 Watts IEEE 802.3af devices
or eight 30 Watts IEEE 802.3at devices can be easily installed without the power-
socket limitation.
To facilitate power management, the GSD-808HP / GSD-808HP2 is implemented
powerful PoE management feature, the over temperature protection to prevent
power budget overloading. The four orange LEDs hardware designed that located

6
on right side of GSD-808HP / GSD-808HP2 front panel, it call “PoE Power Usage”
and its meaning of lower to upper LED is 25%, 50%, 75% and 95%. With these
LED indications, you can monitor current PoE power used status of GSD-808HP /
GSD-808HP2 easily and efciently.
Providing data transfer and High Power PoE in one unit, the GSD-808HP / GSD-
808HP2 shall reduce the need of extension cables and dedicated electrical outlets
on the wall, ceiling or any unreachable place. It helps to lower the installation
costs and simplify the installation effort. Besides, the rst important key feature
is energy saving. With more efcient switching power supply, the efciency of the
GSD-808HP / GSD-808HP2 would be much better than eight linear power adapters
in the long run. Furthermore, it is the ideal device for bridging among Fast Ethernet
and Gigabit Ethernet workgroups and networks. With Gigabit throughput and eight
IEEE 802.3af / 802.3at PoE interfaces supported, the GSD-808HP / GSD-808HP2
is ideal for small business and workgroups to efciently deploy the High Power PoE
network for the wireless access points, IP-based surveillance camera or IP phones
in any places.
The GSD-808HP / GSD-808HP2 has 8K MAC address table, features high
performance switch architecture capable of providing the non-blocking 16Gbps
switch fabric and wire-speed throughput as high as 11.9Mpps, which greatly
simplies the tasks of upgrading the LAN for catering to increasing bandwidth
demands. Besides, the 802.3x Full-Duplex ow control function of the GSD-808HP
/ GSD-808HP2 enables PD devices and servers directly connect to the Switch for
wire-speed packet transfer performance without risk of packet loss.
All RJ-45 copper interfaces in the GSD-808HP / GSD-808HP2 support
10/100/1000Mbps Auto-Negotiation for optimal speed detection through RJ-45
Category 6, 5 or 5e cables. It also supports standard Auto-MDI/MDI-X that can
detect the type of connection to any Ethernet device without requiring special
straight or crossover cables.
1.3 Features
RJ-45 Interface
8-Port 10/100/1000Mbps Gigabit Ethernet ports
8-Port supports 52V DC power to PoE Powered Device
PoE
Complies with IEEE 802.3af / 802.3at Power over Ethernet End-Span PSE
Up to 8 IEEE 802.3af / 802.3at devices powered
PoE Power up to 30 Watts for each 802.3at PoE port

7
GSD-808HP provide 130 Watts PoE budget, GSD-808HP2 provide 240 Watts
PoE Budget
Over Temperature Protection support
Auto detect powered device (PD)
Circuit protection prevents power interference between ports
Remote power feeding up to 100m
Switching
Hardware based 10/100/1000Mbps Auto-Negotiation and Auto MDI/MDI-X
Flow control for Full Duplex operation and back pressure for Half Duplex oper-
ation
Integrates address look-up engine, supporting 8K absolute MAC addresses
9K Jumbo Frame supports at all speed (10/100/1000Mbps)
Automatic address learning and address aging
Hardware
13-inch desktop size, 19” rack mountable; 1U height
LED indicators for system Power, Fan Failure, per port speed, Link / Act
LED indicators for per port PoE In-Use and PoE Power Usage (25%, 50%,
75% and 95%)
 1 FAN to provide stable and efcient power performance
Ethernet Link Energy-Saving technology
- Link down power saving
- Intelligent scales power based on cable length
1.4 Specication
Model GSD-808HP GSD-808HP2
Hardware Specication
Hardware Version 2 1
Network Connector 8-Port RJ-45 for 10/100/1000Base-T
PoE Inject Port 8-Port with 802.3af / 802.3at PoE injector function
LED Display
System: Power x 1 (Green), FAN Alert x 1
(Orange), PoE Power Usage x 4 (Orange)
Per Port: PoE In-use (Orange), Speed (Green),
LNK/ACT (Green)

8
Switch Architecture Store and Forward switch architecture
MAC Address Table 8K MAC address table with Auto learning function
Switch Fabric 16Gbps
Switch Throughput 11.9Mpps
Jumbo Packet Size 9K Bytes
Flow Control Back pressure for Half-Duplex.
IEEE 802.3x Pause Frame for Full-Duplex
Power Requirement AC 100~240V, 50/60Hz,
1.5A
AC 100~240V, 50/60Hz,
1.25A
Power Consumption 150 Watts / 511BTU 250 Watts / 853BTU
Dimension (W x D x H) 330 x 155 x 43.5mm 330 x 155 x 43.5mm
Weight 1.56kg 1.66kg
Power over Ethernet
PoE Standard IEEE 802.3af / 802.3at Power over Ethernet / PSE
PoE Power Supply Type End-Span
PoE Power Output
Per Port 52V DC, 275mA. Max. 15.4 Watts
(IEEE 802.3af)
Per Port 52V DC, 535mA. Max. 30 Watts
(IEEE 802.3at)
Power Pin Assignment 1/2(+), 3/6(-)
PoE Power Budget 130 Watts 240 Watts
Max. number of Class 2 PD 8 8
Max. number of Class 3 PD 8 8
Max. number of Class 4 PD 4 8
Standard Conformance
EMI Safety FCC Class A, CE
Operating Environment 0 ~ 50 Degree C
Storage Environment -40 ~ 70 Degree C
Operating Humidity 5 ~ 95%, Relative Humidity, non-condensing
Storage Humidity 5 ~ 95%, Relative Humidity, non-condensing
Standard Compliance
IEEE 802.3
IEEE 802.3u
IEEE 802.3ab
IEEE 802.3x
IEEE 802.3af
IEEE 802.3at
Ethernet
Fast Ethernet
Gigabit Ethernet
Flow Control
Power over Ethernet
High Power over Ethernet

9
2. Hardware Description
2.1 Front Panel
The Front Panel of the GSD-808HP / GSD-808HP2 PoE Ethernet Switch consists of
8x Auto-Sensing 10/100/1000Mbps Ethernet RJ-45 Ports. The LED Indicators are
also located on the front panel of the GSD-808HP / GSD-808HP2.
Figure 2-1: GSD-808HP Switch Front Panel
PoE I n Use
1PWR
FAN Alert
1000
95%
PoE Power
Usage
75%
50%
25%
2345678
GSD-808HP2
8-Port 10/100/1000Mbps 802.3at PoE Switch 2
1
4
3
6
5
8
7
ACT
LNK
Full 30Watts
Figure 2-2: GSD-808HP2 Switch Front Panel
2.1.1 LED Indicators
System
LED Color Function
PWR Green Lights to indicate that the Switch has power.
FAN Alert Orange Lights to indicate that the FAN failure.
Per 10/100/1000Mbps Port
LED Color Function
PoE In-use Orange
Lights to indicate the port is providing 52V DC in-line
power. (1-8 ports), blinks slowly to indicate the port
has no sufcient PoE power to feeding.
Speed Green
Lit: indicate the Switch is successfully connecting to
the network at 1000Mbps.
Off: indicate that the Switch is successfully connecting
to the network at 10Mbps or 100Mbps.
LNK/ACT Green
Lit: indicate the link through that port is successfully
established.
Blinks to indicate that the Switch is actively sending or
receiving data over that port.

10
Per PoE Power Usage (Unit : %) (Lower LED to upper LED)
LED Color Function
25% Orange Lights to indicate the system has 25% PoE power usage.
50% Orange Lights to indicate the system has 50% PoE power usage.
75% Orange Lights to indicate the system has 75% PoE power usage.
95% Orange Lights and blinks to indicate the system has 95% PoE power
usage.
2.2 Rear Panel
The rear panel of the GSD-808HP / GSD-808HP2 indicates an AC inlet power
socket, which accepts input power from 100 to 240V AC, 50-60Hz, 1.5A (GSD-
808HP) / 1.25A (GSD-808HP2) and has a fan hole on the rear panel.
100~240V AC
50/60Hz
ON
OFF
POWER
Figure 2-3: GSD-808HP / GSD-808HP2 Switch Rear Panel
Power
Notice
The device is a power-required device, it means, it will not work till
it is powered. If your networks should active all the time, please
consider using UPS (Uninterrupted Power Supply) for your device.
It will prevent you from network data loss or network downtime.
In some area, installing a surge suppression device may also help
to protect your GSD-808HP / GSD-808HP2 from being damaged by
unregulated surge or current to the GSD-808HP / GSD-808HP2 or
the power adapter.
Before start up
Before your installation, please refer to the followings for your cabling:
10/100/1000Base-T
All 10/100/1000Base-T ports come with Auto-Negotiation capability. They
automatically support 1000Base-T, 100Base-TX and 10Base-T networks. Users only
need to plug a working network device into one of the 10/100/1000Base-T ports,
and then turn on the GSD-808HP / GSD-808HP2. The port will automatically runs
in 10Mbps, 20Mbps, 100Mbps or 200Mbps and 1000Mbps or 2000Mbps after the
negotiation with the connected device.

11
Cabling
Each 10/100/1000Base-T ports use RJ-45 sockets -- similar to phone jacks --
for connection of unshielded twisted-pair cable (UTP). The IEEE 802.3 / 802.3u
802.3ab Fast / Gigabit Ethernet standard requires Category 5 UTP for 100Mbps
100Base-TX. 10Base-T networks can use Cat.3, 4, 5 or 1000Base-T use 5/5e/6 UTP
(see table below). Maximum distance is 100meters (328 feet).
Port Type Cable Type Connector
10Base-T Cat 3, 4, 5, 2-pair RJ-45
100Base-TX Cat.5 UTP, 2-pair RJ-45
1000Base-T Cat.5/5e/6 UTP, 2-pair RJ-45
Any Ethernet devices like hubs/ PCs can connect to the GSD-808HP / GSD-808HP2
by using straight-through wires. The eight-10/100/1000Mbps ports are auto-MDI/
MDI-X can be used on straight-through or crossover cable.
2.3 Desktop Installation
To install the Switch on desktop, simply follow the next steps:
Step 1: Attach the rubber feet to the recessed areas on the bottom of the Switch,
as shown in Figure 2-4.
Figure 2-4: Place the Switch on the Desktop
Step 2: Place the Switch on desktop near an AC power source.
Step 3: Keep enough ventilation space between the Switch and the surrounding
objects.
Note
When choosing a location, please keep in mind the environmental
restrictions discussed in Chapter 1, Section 4, in Specification.

12
Step 4: Connect your Switch to 802.3at / 802.3af complied Power Devices (PD)
and other network devices.
A. Connect one end of a standard network cable to the 10/100/1000 RJ-45
ports on the Front of the Switch.
B. Connect the other end of the cable to the network devices such as printer
servers, workstations or routers…etc.
Note
Connection to the Switch requires UTP Category 5 network cabling
with RJ-45 tips. For more information, please see the Cabling
Specification in Appendix A.
Step 5 : Supply power to the Switch.
A. Connect one end of the power cable to the Switch.
B. Connect the power plug of the power cable to a standard wall outlet.
When the Switch receives power, the Power LED should remain solid Green.
2.4 Rack Mounting
To install the Switch in a 19-inch standard rack, follow the instructions described
below.
Step 1: Place your Gigabit Ethernet Switch on a hard at surface, with the front
panel positioned towards your front side.
Step 2: Attach a rack-mount bracket to each side of the Switch with supplied
screws attached to the package. Figure 2-5 shows how to attach brackets
to one side of the Switch.
Figure 2-5: Attaching the Brackets to the Switch
You must use the screws supplied with the mounting brackets.
Damage caused to the parts by using incorrect screws would inval-
idate the warranty.

13
Step 3: Secure the brackets tightly.
Step 4: Follow the same steps to attach the second bracket to the opposite side.
Step 5: After the brackets are attached to the Switch, use suitable screws to
securely attach the brackets to the rack, as shown in Figure 2-6.
Figure 2-6: Mounting the Switch in a Rack
Step 6: Proceeds with the steps 4 and steps 5 of session 2.3 Desktop
Installation to connect the network cabling and supply power to your
Switch.

14
2.5 Product Application
2.5.1 Train Station
IEEE 802.3at Compliant IP Surveillance and Wireless Powered Devices
Having the capability of IEEE 802.3at Power over Ethernet standard, the GSD-
808HP / GSD-808HP2 can directly connect with any IEEE 802.3at end-nodes
like PTZ (Pan, Tilt & Zoom) network cameras, PTZ Speed Dome cameras, color
touch- screen Voice over IP (VoIP) telephones, and multi- channel wireless LAN
access points. Besides the wired Internet network, the wireless LAN would be more
efcient for the transportation station to provide high-speed and wide area Internet
services for travelers. By adopting PoE Wireless LAN structure, the transportation
authority gains benet from less cost while providing better Internet services in
wider areas for the travelers.
Airport
Train Station
Core Switch
PoE
PoE
PoE
PoE
PoE
PoE Wireless AP
802.3at Splitter
802.3af Wireless AP
PTZ Camera PTZ Camera
PTZ Camera
N
N
N
N
N
N
DC
GSD-808HP GSD-808HP2
DC Power Line (DC)
1000Base-T UTP
PoE
1000Base-T UTP with PoE
2.4GHz 802.11n
N
Figure 2-7: End Node or Switch Connection
Note
Cable distance for Switch
The cable distance between the GSD-808HP / GSD-808HP2 and
other network equipments should not exceed 100 meter for UTP/
STP cable.
Make sure the wiring is correct
It can be used Category 3/4/5 cable in 10Mbps operation. To reli-
ably operate your network at 100Mbps or 1000Mbps, you must use
an Unshielded Twisted-Pair (UTP) Category 5/5e/6 cable, or better
Data Grade cabling. While a Category 3 or 4 cables may initially
seem to work, it will soon cause data loss.

15
2.5.2 IPOfce
With the business ofce expansion, the additional telephones required could be
installed in less cost via the implementation of PoE IP Telephony system than
that of the traditional circuit wiring telephony system. PLANET GSD-808HP / GSD-
808HP2 802.3at Desktop PoE Switch helps enterprises to create an integrated data,
voice, and powered network. PLANET IEEE 802.3af compliant IP Phones can be
installed without the need of an additional power cable because the power can be
provided via the standard Ethernet cable from the connected GSD-808HP / GSD-
808HP2. PoE IP Phones and Analog Telephony Adapter work perfectly with the
GSD-808HP / GSD-808HP2 which injects power through the Ethernet cables.
With the GSD-808HP / GSD-808HP2, IP Telephony deployment becomes more
reliable and cost effective, which helps enterprises save tremendous cost when
upgrading from the traditional telephony system to IP Telephony communications
infrastructure.
Laptop
PoE
PoE
PoE
PoE
PoE
DC
802.3at Splitter
PoE VoIP
Phone
Phone
N
N
PTZ Camera
PoE VoIP ATA
PoE IP
Camera
Core
Switch
PoE Wireless
AP GSD-808HP
GSD-808HP2
GSD-808HP2
DC Power Line (DC)
1000Base-T UTP
PoE
1000Base-T UTP with PoE
Telephone wire
Figure 2-8: IP Ofce Department / Workgroup PoE Switch Connection

16
2.6 Power over Ethernet Powered Device
3~5 Watts
Voice over IP phones
Enterprise can install POE VoIP Phone, ATA and other
Ethernet/non-Ethernet end-devices to the central where UPS
is installed for un-interrupt power system and power control
system.
6~12 Watts
Wireless LAN Access Points
Museum, Sightseeing, Airport, Hotel, Campus, Factory,
Warehouse can install the Access Point any where with no
hesitation.
10~12 Watts
IP Surveillance
Enterprise, Museum, Campus, Hospital, Bank, can install IP
Camera without limits of install location – no need electrician
to install AC sockets.
3~12 Watts
PoE Splitter
PoE Splitter split the PoE 52V DC over the Ethernet cable
into 5/12V DC power output. It frees the device deployment
from restrictions due to power outlet locations, which
eliminate the costs for additional AC wiring and reduces the
installation time.
3~25 Watts
High Power PoE Splitter
High PoE Splitter split the PoE 52V DC over the Ethernet
cable into 24/12V DC power output. It frees the device
deployment from restrictions due to power outlet locations,
which eliminate the costs for additional AC wiring and
reduces the installation time.
30 Watts
High Power Speed Dome (Without heater)
This state-of-the-art design is considerable to t in various
network environments like trafc centers, shopping malls,
railway stations, warehouses, airports, and production
facilities for the most demanding outdoor surveillance
applications - no need electrician to install AC sockets.
Note
Since the GSD-808HP / GSD-808HP2 per PoE port supports 52V
DC PoE power output, please check and assure the Powered Device
(PD) acceptable DC power range is from 52V DC. Otherwise, it will
damage the Powered Device (PD).

17
3. 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 15.4W of DC power
(minimum 44V DC and 350mA) to each device. Only 12.95W 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 25.5W of power. The 2009 standard prohibits a powered device
from using all four pairs for power
The 802.3af / 802.3at dene 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 specication 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 Ethernet cable. The maximum allowed continuous output
power per cable in IEEE 802.3af is 15.40W. A later specication, IEEE 802.3at,
offers 25.50W. When the device is a switch, it is commonly called an End-span

18
(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 Phones, and IP cameras. Many powered
devices have an auxiliary power 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-T. The specication allows two options for using
these cables for power, shown in Figure 2 and Figure 3:
The spare pairs are used. Figure 2 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).
POWER SOURCING
EQUIPMENT (PSE)
POWERED DEVICE
(PD)
SPARE PAIR
SPARE PAIR
SIGNAL PAIR
SIGNAL PAIR
Converter
DC / DC
RX
TX
TX
RX
48V
4
5
1
2
3
6
7
8
4
5
1
2
3
6
7
8
+
-Converter
Figure 1 - Power Supplied over the Spare Pins

19
The data pairs are used. Since Ethernet pairs are transformer coupled at each
end, it is possible to apply DC power to the center tap of the isolation transformer
without upsetting the data transfer. In this mode of operation the pair on pins 3
and 6 and the pair on pins 1 and 2 can be of either polarity.
POWER SOURCING
EQUIPMENT (PSE)
POWERED DEVICE
(PD)
SPARE PAIR
SPARE PAIR
SIGNAL PAIR
SIGNAL PAIR
DC / DC
RX
TX
TX
RX
48V
4
5
1
2
3
6
7
8
4
5
1
2
3
6
7
8
+/-
+/-Converter
Figure 2 - Power Supplied over the Data Pins

20
4. Troubleshooting
This chapter contains information to help you solve issues. If the Switch is not
functioning properly, make sure the Ethernet Switch was set up according to
instructions in this manual.
The Link LED is not lit
Solution:
Check the cable connection and remove duplex mode of the Switch.
Performance is bad
Solution:
Check the full duplex status of the Switch. If the Ethernet Switch is set to full
duplex and the partner is set to half duplex, then the performance will be poor.
1000Base-TportlinkLEDislit,butthetrafcisirregular
Solution:
Check that the attached device is not set to dedicate full duplex. Some devices
use a physical or software switch to change duplex modes. Auto-negotiation may
not recognize this type of full-duplex setting.
Why the Switch doesn’t connect to the network
Solution:
Check the LNK/ACT LED on the switch Try another port on the Switch Make sure
the cable is installed properly Make sure the cable is the right type Turn off the
power. After a while, turn on power again.
Why I connect my PoE device to GSD-808HP / GSD-808HP2 and it
cannot power on?
Solution:
1. Please check the cable type of the connection from GSD-808HP / GSD-808HP2
to the other end. The cable should be an 8-wire UTP, Category 5 or above,
EIA568 cable within 100 meters. A cable with only 4-wire, short loop or over
100 meters, all will affect the power supply.
2. Please check and assure the device that fully complied with IEEE 802.3at /
802.3af standard.
What is the power output of each PoE port?
Solution:
1. Each PoE port supports 52V DC, 535mA, max 30 Watts power output.
Detect and inject by the standard of IEEE 802.3at.
2. Each PoE port supports 52V DC, 275mA, max 15.4 Watts power output.
Detect and inject by the standard of IEEE 802.3af.