LevelOne GSW-2457 User manual

LevelOne
User Manual
GSW-1657/GSW-2457
16/24-Port Gigabit Ethernet Switch
V2.0-0908

COPYRIGHT & TRADEMARKS
Specifications are subject to change without notice. LevelOne is a registered
trademark of Digital Data Communications Asia Co., Ltd. Other brands and
product names are trademarks or registered trademarks of their respective
holders.
No part of the specifications may be reproduced in any form or by any means
or used to make any derivative such as translation, transformation, or
adaptation without permission from Digital Data Communications Co., LTD. All
rights reserved.
http://www.level1.com

FCC STATEMENT
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.
This device complies with part 15 of the FCC Rules. Operation is subject to the
following two conditions:
1) This device may not cause harmful interference.
2) This device must accept any interference received, including interference
that may cause undesired operation.
Any changes or modifications not expressly approved by the party responsible
for compliance could void the user’s authority to operate the equipment.
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.

TABLE OF CONTENTS
Package Contents ...........................................................................................1
Chapter 1. Introduction of the Product .......................................................... 2
1.1 Overview of the Product..............................................................2
1.2 Features...................................................................................... 2
1.3 IEEE 802.1p QoS........................................................................3
Chapter 2. Installation................................................................................... 4
2.1 Mounting the Switch on a Desk................................................... 4
2.2 Mounting the Switch in a Rack.................................................... 4
2.3 Power On....................................................................................5
Chapter 3. Identifying External Components ................................................6
3.4 Front Panel .................................................................................6
3.5 Rear Panel ..................................................................................6
3.6 LED Indicators ............................................................................6
Appendix A: Specifications ............................................................................7
Appendix B: Troubleshooting ........................................................................8
Appendix C: Contact Information .....................................................................8

1
Package Contents
The following contents should be found in your package:
¾One GSW-1657/GSW-2457 Switch
¾One power cord
¾This User Guide
¾Rubber footpads for Desk-mount
¾Rack-mount kit for installing the switch in a 19-inch rack
Note:
Make sure that the package contains the above items. If any of the listed items
are damaged or missing, please contact with your distributor.
Safety Notices
Do not use this product near water. Avoid using this product during an electrical
storm. Do not place heavy objects on the switch.

2
Chapter 1. Introduction of the Product
This chapter describes the features of the GSW-1657/GSW-2457 16/24-port
Gigabit Ethernet Switch.
1.1 Overview of the Product
The GSW-1657/GSW-2457 16/24-port Gigabit Ethernet Switch provides you
with a high-performance, low-cost, easy-to-use, seamless and standard
upgrade to boost your old network to 1000Mbps. Increase the speed of your
network server and backbone connections make Gigabit a reality. Power users
in the home, office, workgroup, or creative production environment can now
move large, bandwidth-intensive files faster. Transfer graphics, CGI, CAD, or
multimedia files and other applications that have to move large files across the
network almost instantly.
The GSW-1657/GSW-2457 features a non-blocking switching architecture that
forwards and filters packets at full wire-speed for maximum throughput, MAC
address auto- learning and auto-aging, IEEE802.3x flow control for full-duplex
mode and backpressure for half-duplex mode. It is compatible with all 10,100
and 1000Mbps Ethernet devices because it is standard-based. It protects your
existing network investments while providing you with a straightforward
migration path to faster Gigabit speeds.
The GSW-1657/GSW-2457 is plug-and-play and no configuration is required.
Auto MDI/MDI-X cable detection on all ports eliminate the need for crossover
cable or Uplink port. Each port can be used as general ports or Uplink ports,
and any port can be simply plugged into a server, a hub, a router or a switch,
using the straight cable or crossover cable. Diagnostic LEDs which display link
status and activity, allowing you to quickly detect and correct problems on the
network.
1.2 Features
¾Supports IEEE 802.1p QoS
¾Complies with IEEE802.3, IEEE802.3u, IEEE802.3ab standards
¾16/24 10/100/1000Mbps Auto-Sense RJ45 ports supporting
Auto-MDI/MDIX
¾All ports Support Full/Half Duplex transfer mode for 10/100Mbps and Full
Duplex transfer mode for 1000Mbps
¾Supports IEEE802.3x flow control for full-duplex mode and backpressure
for half-duplex transfer mode
¾Non-blocking switching architecture that forwards and filters packets at full
wire-speed for maximum throughput

3
¾Supports MAC address auto-learning and auto-aging
¾LED indicators for monitoring power, link, speed and activity
¾Rack-mountable steel case
¾Internal power supply
1.3 IEEE 802.1p QoS
The GSW-1657/GSW-2457 16/24-port Gigabit Ethernet Switch supports
802.1p priority queuing Quality of Service, which is an implementation of the
IEEE 802.1p standard. With 802.1p QoS function, you can reserve bandwidth
for important functions that require a large bandwidth or have a high priority,
such as VoIP (Voice-over Internet Protocol), web browsing applications or
video conferencing. The Switch has separate hardware queues on every
physical port which packets from various applications are mapped to and
assigned a priority to. The illustration below shows how 802.1p priority queuing
is implemented on the Switch.
Mapping QoS on the Switch
The Switch has four priority queues labeled 0, 1, 2 and 3. The untagged
packets and the eight IEEE 802.1p priority levels defined by the standard are
mapped to the four class queues used on the Switch. Among these four priority
queues on the Switch, Class 3 has the highest priority, while Class 0 has the
lowest priority and Class 3 has higher priority compared with Class 2. The
Untagged packets and eight priority tags, specified in IEEE 802.1p are mapped
to the switch’s priority tags as follows:
The Untagged packets, priority 1 and 2 are assigned to the switch’s Class 0
queue.
Priority 0 and 3 are assigned to the switch’s Class 1 queue.
Priority 4 and 5 are assigned to the switch’s Class 2 queue.
Priority 6 and 7 are assigned to the switch’s Class 3 queue.
The Switch uses WRR (Weighted Robin Round) for scheduling. WRR
queue-scheduling algorithm schedules all the queues in turn and every queue
can be assured of a certain service time. The default value of QoS mode on
this Switch is “weight 1:2:4:8” from Class 0 to Class 3 queue in turn.

4
Chapter 2. Installation
2.1 Mounting the Switch on a Desk
Before place the Switch on a desk, attach four rubber footpads to the flutes on
the Switch bottom, then lay the Switch on the desktop, where can be have as
much as 5kg placed on top.
Note:
1. The electrical outlet shall be installed near the device and shall be easily
accessible.
2. Make sure there is free space for radiating heat and air.
3. Make sure not to place anything too heavy on top of the switch.
2.2 Mounting the Switch in a Rack
The dimension of GSW-1657/GSW-2457 is designed according to the
standard 19 rack-mountable steel case of Electronic Industries Association.
Turn off all the equipment connected to the Switch before mounting it in the
rack, then rivet the two "L" brackets onto each side of the Switch, fasten it with
screws in the rack.
Figure 2-1 Rivet the “L” brackets onto the Switch

5
Figure 2-2 Fasten the Switch in the rack
2.3 Power On
GSW-1657/GSW-2457 16/24-port Gigabit Ethernet Switch is powered by AC
power supply. Powering on the Switch, it will automatically initialize and its LED
indicators should respond as follows:
1）All of the Link/Act and 1000Mbps LED indicators will flash momentarily for
one second, which represents a resetting of the system.
2）The Power indicator will light up.
If the LED indicators don't respond as described above, please check the
power supply and connection.

6
Chapter 3. Identifying External Components
This Chapter describes the front panel, rear panel and LED indicators of the
Switch. GSW-1657 and GSW-2457 just differ in the number of LED indicators
and ports and all figures in this guide are of GSW-2457.
3.4 Front Panel
The front panel of the GSW-2457 consists of switch LED indicators, 24
10/100/1000Mbps RJ-45 ports.
Figure 3-1 GSW-2457 Switch Front Panel sketch
3.5 Rear Panel
The rear panel of the GSW-2457 only features a power receptacle, which is an
AC power receptacle. Connect the female of the power cord head here, and
the male head to the AC power outlet.
Figure 3-2 GSW-2457 Switch Rear Panel sketch
3.6 LED Indicators
The LED indicators include Power, Link/Act and 1000Mbps LED indicators,
which are used for monitoring and pre- troubleshooting of the Switch. The
following section shows the LED indicators for the switch along with an
explanation of each indicator.
Figure 3-3 GSW-2457 Switch LEDs sketch
¾Power LED: This indicator will light solid red when the Switch powers up. If
the LED is not lit, please check the power supply and connection.
¾Link/Act LED: This indicator will light solid green when the corresponding
port is connected to another device and will flash green when data is being
transmitted or received on the working connection.
¾1000Mbps LED: This indicator will light solid green when the corresponding
port is connected to a 1000Mbps device.

7
Appendix A: Specifications
General
Standards
IEEE802.3 10Base-T
IEEE802.3u 100Base-TX
IEEE802.3ab 1000Base-T
Topology Star
Protocol CSMA/CD
Ethernet: 10Mbps (Half Duplex), 20Mbps (Full
Duplex)
Fast Ethernet: 100Mbps (Half Duplex),
200Mbps (Full Duplex)
Data Transfer Rate
Gigabit Ethernet: 2000Mbps (Full Duplex)
10Base-T: UTP category 3, 4, 5 cable
(maximum 100m)
EIA/TIA-568 100 STP (maximum 100m)
100Base-TX: UTP category 5, 5e cable
(maximum 100m)
EIA/TIA-568 100 STP (maximum 100m)
Network Media (Cable)
1000Base-T: UTP category 5, 5e cable
(maximum 100m)
EIA/TIA-568 100 STP (maximum 100m)
Number of Ports 16/24 10/100/1000Mbps Auto-Negotiation
RJ-45 ports
LED indicators Power, Link/Act, 1000Mbps
Transfer Method Store-and-Forward
MAC Address Learning Automatically learning, automatically aging
10Base-T: 14881pps/Port
100Base-Tx: 148810pps/Port
Frame Filter Rate
1000Base-T: 1488095pps/Port
10Base-T: 14881pps/Port
100Base-Tx: 148810pps/Port
Frame Forward Rate
1000Base-T: 1488095pps/Port

8
Environmental and Physical
Dimensions 17.3×7.1×1.7in. (440×180×44mm) W×D×H
Power Supply Output 100-240V~ 50/60Hz 0.6A
Operating Temperature 0 ~40℃(32 ~104℉)
Storage Temperature -40 ~70℃(-40 ~158℉)
Operating Humidity 10%~90% non-condensing
Storage Humidity 5%~90% non-condensing
Appendix B: Troubleshooting
1. The Power LED is not lit
¾Make sure the AC power cord connected the Switch with power source
properly.
¾Make sure the power source is ON.
2. The Link/Act LED is not lit when a device is connected to the
corresponding port
¾Make sure that the cable connectors are firmly plugged into the Switch and
the device.
¾Make sure the connected device is turned on and working well.
¾The cable must be less than 100 meters long (328 feet).
Appendix C: Contact Information
For help with the installation or operation of the GSW-1657/ GSW-2457
16/24-port Gigabit Ethernet Switch, please contact us.
E-mail: [e-mail]
Website: http://www.level1.com