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3.4 Store-and-Forward
Store-and-Forward is one type of packet-forwarding techniques. A
Store-and-Forward Gigabit Ethernet Switch stores the incoming frame
in an internal buffer and does the complete error checking before
transmission. Therefore, packets transmitted to the destination are
without errors. It is the best choice when a network needs efficiency
and stability.
The Gigabit Ethernet Switch scans the destination address from the
packet-header, searches the routing table provided for the incoming port
and forwards the packet, only if required. The fast forwarding makes the
switch attractive for connecting servers directly to the network, thereby
increasing throughput and availability. However, the switch is most
commonly used to segment existing hubs, which nearly always improves
the overall performance. An Ethernet Switching can be easily configured
in any Ethernet network environment to significantly boost bandwidth
using conventional cabling and adapters.
Owing to the learning function of the Gigabit Ethernet Switch, the
source address and corresponding port number of each incoming
and outgoing packet are stored in a routing table. This information is
subsequently used to filter packets whose destination address is on the
same segment as the source address. This confines network traffic to its
respective domain, reducing the overall load on the network.
"Store
and
Forward";
The
Gigabit
Ethernet
Switch
performs
therefore, no error will occur for packets. More reliably, it reduces the
re-transmission rate and thus, no packet loss will occur.
3.5 Auto-Negotiation
The STP ports on the Gigabit Ethernet Switch have built-in "Auto-
Negotiation". This technology automatically sets the best possible
bandwidth when a connection is established with another network device
(usually at Power On or Reset). This is done by detecting the modes and
speeds of both devices connected, and both 10BASE-T and 100BASE-TX
devices can be connected with the port in either half- or full-duplex
mode. 1000BASE-T can be only connected in full-duplex mode.
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4. Troubleshooting
This chapter contains information to help you solve issues. If the Gigabit
Ethernet Switch is not functioning properly, make sure the Gigabit
Ethernet Switch was set up according to instructions in this manual.
The per port LED is not lit
Solution:
Check the cable connection of the Gigabit Ethernet Switch.
Performance is bad
Solution:
Check the speed duplex mode of the partner device. The Gigabit
Ethernet Switch is run in auto-negotiation mode and if the partner is set
to half duplex, then the performance will be poor.
Per port LED is lit, but the traffic 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 Gigabit Ethernet Switch isn't connected to the network
Solution:
Check per port LED on the Gigabit Ethernet Switch. Try another port on
the Gigabit Ethernet 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 the power again.
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Appendix A: Networking CONNECTION
A.1 Switch's RJ45 Pin Assignments
1000Mbps, 1000BASE-T
Contact
MDI
MDI-X
1
BI_DA+
BI_DB+
2
BI_DA-
BI_DB-
3
BI_DB+
BI_DA+
4
BI_DC+
BI_DD+
5
BI_DC-
BI_DD-
6
BI_DB-
BI_DA-
7
BI_DD+
BI_DC+
8
BI_DD-
BI_DC-
10/100Mbps, 10/100BASE-TX
RJ45 Connector pin assignment
MDI
MDI-X
Contact
Media Dependent
Media Dependent
Interface
Interface -Cross
1
Tx + (transmit)
Rx + (receive)
2
Tx - (transmit)
Rx - (receive)
3
Rx + (receive)
Tx + (transmit)
4, 5
Not used
6
Rx - (receive)
Tx - (transmit)
7, 8
Not used
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A.2 RJ45 cable Pin Assignment
The standard RJ45 receptacle/connector
There are 8 wires on a standard UTP/STP cable and each wire is color-
coded. The following shows the pin allocation and color of straight-
through cable and crossover cable connection:
Straight Cable
SIDE 1
SIDE 2
1 2 3 4 5 6 7 8
SIDE 1
1 = White/Orange
1 = White/Orange
2 = Orange
2 = Orange
3 = White/Green
3 = White/Green
4 = Blue
4 = Blue
5 = White/Blue
5 = White/Blue
1 2 3 4 5 6 7 8
SIDE 2
6 = Green
6 = Green
7 = White/Brown
7 = White/Brown
8 = Brown
8 = Brown
Cross Over Cable
SIDE 1
SIDE 2
1 2 3 4 5 6 7 8
SIDE 1
1 = White/Orange
1 = White/Green
2 = Orange
2 = Green
3 = White/Green
3 = White/Orange
4 = Blue
4 = Blue
5 = White/Blue
5 = White/Blue
1 2 3 4 5 6 7 8
SIDE 2
6 = Green
6 = Orange
7 = White/Brown
7 = White/Brown
8 = Brown
8 = Brown
Figure A-1: Straight-through and Crossover Cable
Please make sure your connected cables are with the same pin
assignment and color as the above description before deploying the
cables into your network.
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Customer Support
Thank you for purchase PLANET products. You can browse our online
FAQ resource at the PLANET Web site first to check if it could solve you
issue. If you need more support information, please contact PLANET
Media Converter support team.
PLANET online FAQ:
http://www.planet.com.tw/en/support/faq.php?type=3
Media Converter support team mail address:
support_converter@planet.com.tw
Copyright © PLANET Technology Corp. 2016.
Contents are subject to revision without prior notice.
PLANET is a registered trademark of PLANET Technology Corp. All other trademarks
belong to their respective owners.
- 13 -
EC Declaration of Conformity
For the following equipment:
*Type of Product:
8-Port 10/100/1000Mbps Desktop Gigabit Ethernet Switch (Internal Power)
*Model Number:
GSD-805
* Produced by:
Manufacturer's Name :
Planet Technology Corp.
Manufacturer's Address:
11F, No 96, Min Chuan Road,
Hsin Tien, Taipei, Taiwan, R.O.C.
is herewith confirmed to comply with the requirements set out in the Council Directive on the
Approximation of the Laws of the Member States relating to Electromagnetic Compatibility
Directive on (2004/108/EC).
For the evaluation regarding the EMC, the following standards were applied:
EN55022
(2006, CLASS B)
EN 61000-3-2
(2006)
EN 61000-3-3
(1995, A1: 2001, A2: 2005)
EN55024
(1998, A1: 2001, A2: 2003)
IEC 61000-4-2
(2001)
IEC 61000-4-3
(2006)
IEC 61000-4-4
(2004)
IEC 61000-4-5
(2006)
IEC 61000-4-6
(2007)
IEC 61000-4-8
(2001)
IEC 61000-4-11
(2004)
Responsible for marking this declaration if the:
Manufacturer
� Authorized representative established within the EU
⌧
Authorized representative established within the EU (if applicable):
Company Name:
Planet Technology Corp.
Company Address:
11F, No.96, Min Chuan Road, Hsin Tien, Taipei, Taiwan, R.O.C
Person responsible for making this declaration
Name, Surname
Kent Kang
Position / Title :
Product Manager
Taiwan
29
th
Aug., 2008
Place
Date
Legal Signature
PLANET TECHNOLOGY CORPORATION
e-mail: sales@planet.com.tw
http://www.planet.com.tw
11F, No. 96, Min Chuan Road, Hsin Tien, Taipei, Taiwan, R.O.C. Tel:886-2-2219-9518 Fax:886-2-2219-9528
-
14 -
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