Amer.com ATCSGR24021125 User manual

Gigabit Ethernet Switch
User’s Guide
Version 1.0
P/N: ATCSGR24021125 Rev.A
This User's Guide contains important information
regarding the installation of your switch. Please read it
completely before beginning installation.
For future reference, record the serial number
of your network switch in the space below:
SERIAL number
The serial number is located on the bottom of the switch.

Amer.com
7259 Bryan Dairy Road, Largo, FL 33777
© Amer.com Corp., 1997-2002 All rights reserved. No part of this publication
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
Amer.com, as stipulated by the United States Copyright Act of 1976.
Amer.com reserves the right to make changes to this document and the
products which it describes without notice. Amer.com shall not be liable for
technical or editorial errors or omissions made herein; nor for incidental or
consequential damages resulting from the furnishing, performance, or use of
this material.
Amer.com is a registered trademark of Amer.com. All other trademarks and
trade names are properties of their owners.
FCC Class A Certification Statement
Model SGR24 FCC Class A
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,
and (2)This device must accept any interference received, including
interference that may cause undesired operation.
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 in a
residential installation. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular
installation. If the equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one or more of
the following measures:
•Reorient or relocate the receiving antenna.

•Increase the separation between the equipment and receiver.
•Connect the equipment into an outlet on a circuit different from that to
which the receiver is connected to.
•Consult the dealer or an experienced radio/TV technician for help.
Shielded interface cables must be used in order to comply with emission limits.
You are cautioned that changes or modifications not expressly approved by the
party responsible for compliance could void your authority to operate the
equipment. For more information please contact the Federal Communication
Commission.
CE Mark Class A Statement 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
ABOUT THIS GUIDE............................................................1
TERMS ....................................................................................1
OVERVIEW OF THIS USER’S GUIDE .........................................1
INTRODUCTION...................................................................2
GIGABIT ETHERNET TECHNOLOGY .........................................2
SWITCHING TECHNOLOGY ......................................................3
FEATURES...............................................................................3
UNPACKING AND SETUP ..................................................5
UNPACKING............................................................................5
SETUP .....................................................................................5
DESKTOP INSTALLATION ........................................................5
RACK INSTALLATION..............................................................6
IDENTIFYING EXTERNAL COMPONENTS...................8
FRONT PANEL.........................................................................8
REAR PANEL...........................................................................8
LED INDICATORS ...................................................................9
TECHNICAL SPECIFICATIONS .....................................10

1
ABOUT THIS GUIDE
This user’s guide tells you how to install your 24-Port 1000BASE-T
Gigabit Ethernet Switch and how to connect it to your Gigabit
Ethernet network.
Terms
For simplicity, this documentation uses the terms “Switch” (first letter
upper case) to refer to the 24-Port 1000BASE-T Gigabit Ethernet
Switch, and “switch” (first letter lower case) to refer to all Ethernet
switches, including the 24-Port 1000BASE-T Gigabit Ethernet
Switch.
Overview of this User’s Guide
Introduction. Describes the Switch and its features.
Unpacking and Setup. Helps you get started with the basic
installation of the Switch.
Identifying External Components. Describes the front panel, rear
panel, and LED indicators of the Switch.
Technical Specifications. Lists the technical specifications of the
Switch.

2
INTRODUCTION
This section describes the features of the 24-Port 1000BASE-T
Gigabit Ethernet Switch, as well as giving some background
information about Gigabit Ethernet and switching technology.
Gigabit Ethernet Technology
Gigabit Ethernet is an extension of IEEE 802.3 Ethernet utilizing the
same packet structure, format, and support for CSMA/CD protocol,
full duplex, flow control, and management objects, but with a tenfold
increase in theoretical throughput over 100-Mbps Fast Ethernet and a
hundredfold increase over 10-Mbps Ethernet. Since it is compatible
with all 10-Mbps and 100-Mbps Ethernet environments, Gigabit
Ethernet provides a straightforward upgrade without wasting a
company’s existing investment in hardware, software, and trained
personnel.
The increased speed and extra bandwidth offered by Gigabit Ethernet
is essential to coping with the network bottlenecks that frequently
develop as computers and their busses get faster and more users use
applications that generate more traffic. Upgrading key components,
such as your backbone and servers to Gigabit Ethernet can greatly
improve network response times as well as significantly speed up the
traffic between your subnets.
Gigabit Ethernet supports video conferencing, complex imaging, and
similar data-intensive applications. Likewise, since data transfers
occur 10 times faster than Fast Ethernet, servers outfitted with Gigabit
Ethernet NIC’s are able to perform 10 times the number of operations
in the same amount of time.

3
Switching Technology
Another key development pushing the limits of Ethernet technology is
in the field of switching technology. A switch bridges Ethernet
packets at the MAC address level of the Ethernet protocol transmitting
among connected Ethernet or fast Ethernet LAN segments.
Switching is a cost-effective way of increasing the total network
capacity available to users on a local area network. A switch increases
capacity and decreases network loading by making it possible for a
local area network to be divided into different segments which don’t
compete with each other for network transmission capacity, giving a
decreased load on each.
The switch acts as a high-speed selective bridge between the
individual segments. Traffic that needs to go from one segment to
another is automatically forwarded by the switch, without interfering
with any other segments. This allows the total network capacity to be
multiplied, while still maintaining the same network cabling and
adapter cards.
Switching LAN technology is a marked improvement over the
previous generation of network bridges, which were characterized by
higher latencies. Routers have also been used to segment local area
networks, but the cost of a router and the setup and maintenance
required make routers relatively impractical. Today’s switches are an
ideal solution to most kinds of local area network congestion
problems.
Features
The 24-Port 1000BASE-T Gigabit Ethernet Switch was designed for
easy installation and high performance in an environment where
traffic on the network and the number of users increase continuously.
24 1000BASE-T Gigabit Ethernet ports
Supports Auto-Negotiation for speed and duplex mode

4
Supports Auto-MDIX for each port
Full/half duplex transfer mode for 10Mbps and 100Mbps
Full duplex transfer mode for 1000Mbps
Massive 20G Switching Fabric
Store-and-Forward switching method
IEEE 802.3x flow control for full-duplex mode
Backpressure flow control for half-duplex mode
Integrated address Look-Up Engine, supports 32K absolute
MAC addresses
Supports 2MBytes data buffer per device
Extensive front-panel diagnostic LEDs

5
UNPACKING AND SETUP
This chapter provides unpacking and setup information for the Switch.
Unpacking
Open the shipping carton of the Switch and carefully unpack its
contents. The carton should contain the following items:
One 24-Port 1000BASE-T Gigabit Ethernet Switch
Accessory pack: 2 mounting brackets and screws
Four rubber feet with adhesive backing
One AC power cord
This User’s Guide
If any item is found missing or damaged, please contact your supplier
for replacement.
Setup
The setup of the Switch can be performed using the following steps:
The surface must support at least 5 kg.
The power outlet should be within 1.82 meters (6 feet) of the device.
Visually inspect the power cord and see that it is secured fully to the
AC power connector.
Make sure that there is proper heat dissipation from and adequate
ventilation around the Switch. Do not place heavy objects on the
Switch.
Desktop Installation
When installing the Switch on a desktop or shelf, the rubber feet
included with the device must be first attached. Attach these

6
cushioning feet on the bottom at each corner of the device. Allow
enough ventilation space between the device and the objects around it.
Gigabit Ethernet Switch installed on Desktop
Rack Installation
The Switch can be mounted in an EIA standard size, 19-inch rack,
which can be placed in a wiring closet with other equipment. To
install, attach the mounting brackets on the switch’s front panel (one
on each side) and secure them with the screws provided.
Attaching the mounting brackets to the Switch
Then, use the screws provided with the equipment rack to mount the
Switch in the rack.

7
Installing the Switch in an equipment rack

8
IDENTIFYING EXTERNAL COMPONENTS
This chapter describes the front panel, rear panel and LED indicators
of the Switch
Front Panel
The front panel of the Switch consists of 24 1000BASE-T Gigabit
Ethernet ports and LED indicators.
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22 2412
15
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48
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10/100/1000Mbps Gigabi t Et her net Swit c h
└───Led Indicators───┘└────────Gigabit Ethernet Ports─────────┘
Front panel view of the Switch
Twenty-four Gigabit Ethernet ports of 10/100/1000Mbps Auto-
Negotiation interface.
Comprehensive LED indicators that display the conditions of the
Switch and status of the network. A description of these LED
indicators follows (see LED Indicators).
Rear Panel
The rear panel of the Switch consists of an AC power connector. The
following shows the rear panel of the Switch.
Rear panel view of the Switch

9
AC Power Connector This is a three-pronged connector that
supports the power cord. Plug in the female connector of the provided
power cord into this connector, and the male into a power outlet.
Supported input voltages range from 100 ~ 240 VAC at 50 ~ 60 Hz.
LED Indicators
The LED indicators of the Switch include Power, Link/Act,
1000Mbps and 100Mbps. The following shows the LED indicators for
the Switch along with an explanation of each indicator.
1 2 3 4 5 6 7 8 9 1011121314151617181920 21222324
10/100/1000Mbps Gigabit Ethernet Switch
The Switch LED indicators
Per unit:
Power This indicator lights green when the Switch is receiving power,
otherwise, it is off.
Per port:
Link/ACT. This indicator lights green when the port is connected to
a Gigabit Ethernet, Fast Ethernet or Ethernet station. If the indicator
blinks green, it is transmitting or receiving data.
1000Mbps. This LED indicator lights green when the port is
connected to a 1000Mbps Gigabit Ethernet station.
100Mbps. This LED indicator lights green when the port is
connected to a 100Mbps Fast Ethernet station.

10
Note: When the Link/ACT LED indicator is lit green and both the
1000Mbps and 100Mbps LED indicators are off, this means the port is
connected to a 10Mbps Ethernet station.

10
TECHNICAL SPECIFICATIONS
General
Standards: IEEE 802.3ab 1000BASE-T
IEEE 802.3u 100BASE-TX
IEEE 802.3 10BASE-T
IEEE 802.3x Flow Control
Protocol: CSMA/CD
Data Transfer
Rate:
10Mbps (Half-duplex)Ethernet:
20Mbps (Full-duplex)
100Mbps (Half-duplex)Fast Ethernet:
200Mbps (Full-duplex)
Gigabit Ethernet: 2000Mbps (Full-duplex)
Topology: Star
Network Cables: Ethernet: 2-pair UTP Cat. 3,4,5, EIA/TIA-
568 100-ohm screened twisted-
pair (STP)
Fast Ethernet: 2-pair UTP Cat. 5, EIA/TIA-568
100-ohm screened twisted-pair
(STP)
Gigabit Ethernet: 4-pair UTP Cat. 5, EIA/TIA-568
100-ohm screened twisted-pair
(STP)
Number of Ports: Twenty-four (24) 1000BASE-T Gigabit Ethernet
ports
Physical and Environmental
AC inputs: 100 – 240 VAC Universal, 50/60 Hz
Power Consumption: 40 watts maximum

11
Physical and Environmental
Operating Temperature: 0 ~ 40 degrees Celsius
Storage Temperature: -10 ~ 70 degrees Celsius
Humidity: 5% ~ 90% RH, non-condensing
Dimensions: 440 mm x 210 mm x 44 mm (1U), 19 inch
rack-mount width
EMI: FCC Class A, CE Marking Class A, VCCI
Class A
Safety: cUL(1950), CB(IEC60950)
Performance
Transmission Method: Store-and-forward
RAM Buffer: 2MBytes per device
Filtering Address Table: 32K MAC address per device
Packet
Filtering/Forwarding Rate: 1,488,100 pps per port max
MAC Address Learning: Self-learning, auto-aging

12
Amer.com Warranty Policy
Limited Lifetime Warranty
In the event of a defect in quality or workmanship, Amer.com will repair or replace any
hardware product sold by Amer.com with new or reconditioned parts free of charge in
North America for a limited lifetime period unless otherwise specified on the sales
invoice from the date of original purchase. All removed parts become the property of
Amer.com. All replaced parts assume the original warranty.
This warranty is extended only to the original purchaser. Proof of purchase will be
required before warranty service is provided.
This warranty covers only failures due to defects in quality or workmanship that occur
during normal use. It does not cover damage that occurs in shipment, electrical storms,
floods, dropped or other acts of nature.
This warranty also does not cover any failure that results from accident, misuse, abuse,
neglect, mishandling, misapplication, alteration, faulty installation, modification,
computer virus, improperly installed or faulty software, or service by anyone other than
an Amer.com Service Technician. If there is evidence that the failure was due to user
negligence, Amer.com has the right to void this warranty and or charge normal service
rates for the subject repair.
The limited warranty covers a one (1) year period from date of purchase on Power
Supplies, AC Adapters & Fans, after the 1 year a cost for replacement is applied to all
products requiring such parts.
Amer.com is not responsible for any type of data loss on hard drive or other storage
devices.
Warranty Service can be obtained during the warranty period by shipping, freight
prepaid, or delivering the product to Amer.com in either the original package or a
similar package providing an equal degree of protection. Amer.com will perform the
required service and return the unit to the user (freight prepaid), if applicable, via the
same mode (i.e. ground, air, etc.)