Amer.com SR24n User manual

10/100Mbps Fast Ethernet
Switch
User’s Guide
Version 4.0
P/N ATC020507SR16n Rev.1
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 USA
© 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 SR24n 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 B 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
TABLE OF CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .VII
FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
UNPACKING AND SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
UNPACKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
DESKTOP OR SHELF INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . .3
RACK INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
MODULE INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
IDENTIFYING EXTERNAL COMPONENTS . . . . . . . . . . . . . . . . . . . . .6
FRONT PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
REAR PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
LED INDICATORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
TECHNICAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

FEATURES
◆24 UTP ports all come with NWay auto-negotiation and operate at 10/100
Mbps for connection to servers and hubs. All ports can auto-negotiate for
full or half-duplex operation.
◆All ports support auto MDI/MDIX, so there is no need to use cross-over
cables or an up-link port.
◆Store-and-forward switching scheme capability to support rate adaptation
and ensure data integrity.
◆Auto-polarity detection for correction of incorrect polarity on the receive
twisted pair at each port.
◆Data forwarding rate 148,800 pps per port at 100% of wire-speed for
100Mbps speed.
◆Data forwarding rate 14,880 pps per port at 100% of wire-speed for 10Mbps
speed.
◆Data filtering rate eliminates all error packets, runts, etc. at 148,800 pps per
port at 100% of wire-speed for 100Mbps speed.
◆Data filtering rate eliminates all error packets, runts, etc. at 14,880 pps per
port at 100% of wire-speed for 10Mbps speed.
◆Up to 4K unicast address entities per device, self-learning, and table aging.
◆256K Byte-on-Chip packet buffer per eight ports.
◆All 24 UTP ports support IEEE802.3x flow control for full duplex and
backpressure flow control for half duplex.
◆Optional two-port Fiber module (SC type connector) in the front panel for
length extension. These two ports operate at either 100M full duplex or half
duplex by means of a manual setting. Please see Chapter Two for additional
information about module settings.
10/100 Fast Ethernet Switch User’s Guide
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10/100 Fast Ethernet Switch User’s Guide
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UNPACKING AND SETUP
Unpacking
Open the shipping carton of the Switch and carefully unpack its contents. The
carton should contain the following items
◆One SR24n 10/100 Fast Ethernet Switch
◆One AC power cord
◆This User’s Guide
◆Four rubber feet with adhesive backing
◆Screws and two L-type brackets for rack mounting
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 3 kg for the Switch.
◆The power outlet should be within 1.82 meters (6 feet) of the device.
◆Visually inspect the power cord and see that it is fully secured 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.
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Desktop or Shelf Installation
When installing the Switch on a desktop or shelf, the rubber feet included with
the device must be first attached. Attach these cushioning feet on the bottom at
each corner of the device. Allow enough ventilation space between the device
and the objects around it.
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.
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10/100 Fast Ethernet Switch User’s Guide
SR24n
Figure 2.1 10/100 Fast Ethernet Switch installed on a Desktop or Shelf

If any item is found missing or damaged, please contact your supplier for
replacement.
Module Installation
An optional two-port fiber module model SRmsc (SC type connector) can be
installed in the front panel. Follow these steps
First, set up the module, adjusting the jumper settings as desired. The default
setting is full duplex.
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SR24n
Figure 2.2 Attaching the mounting brackets to the 10/100 Fast
Ethernet Switch
Figure 2.3 Jumper settings on the module
10/100 Fast Ethernet Switch User’s Guide

Next, make sure that the device is powered off and then remove the plain
bracket on the front of the switch.
After removing the plain bracket, slide the module in the guide rails all the way
into the slot and secure the screws.
When properly installed, the Slot LED will be lit after powering on the Switch
(see Chapter 3 for more information about LEDs, including a diagram).
Note: Always remember to turn off the power before a module is
inserted or removed.
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10/100 Fast Ethernet Switch User’s Guide
SR24n
Figure 2.4 Removing the plain bracket
SR24n
Figure 2.4 Removing the plain bracket

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10/100 Fast Ethernet Switch User’s Guide
IDENTIFYING EXTERNAL
COMPONENTS
Front Panel
The front panel of the Switch consists of 24 10/100 Mbps MDI-II/MDI-X ports
and LED indicators.
Rear Panel
The rear panel of the Switch consists of an AC power connector.
◆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.
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SR24n
LED INDICATORS Optional Fiber Module 10/100 PORTS
(MDI II/MDI X)
Figure 3.1 Front panel view of the SR24n Switch
AC LINE
100-240 VAC
50-60 Hz
0.6A MAX
AC POWER
CONNECTOR
Figure 3.2 Rear panel view of the SR24n switch

LED Indicators
The LED indicators of the Switch include Power, 100M, Link/Act
(Link/Activity), and Slot. The LED indicators are used to facilitate monitoring
and troubleshooting of the Switch. The following shows the LED indicators for
the Switch along with an explanation of each indicator.
◆Power This indicator operates when the Switch is turned on. If this indicator
is not lit, check the AC power connector to ensure proper insertion of the
power cord.
◆100M The LED indicator lights green when a 100 Mbps device is connected
to a respective port. If a 10 Mbps device is connected to a respective port,
the LED indicator is OFF.
◆Link/Act These LED indicators are lighted green when there is a secure
connection (or link) to a device at any of the ports. The LED indicators blink
green whenever there is reception or transmission (i.e. Activity—Act) of
data occurring at a port.
◆Slot This LED indicator is lighted green when there is a secure connection
(or link) to an optional two-port 100BASE-FX (SC type) module is installed
in the front panel. Each port has its own LED, designated as I and II. See
100M and Link/Act indicator descriptions above for further information.
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10/100 Fast Ethernet Switch User’s Guide
SR24n
Figure 3.3 The SR24n Switch LED indicators

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10/100 Fast Ethernet Switch User’s Guide
TECHNICAL SPECIFICATIONS
A
General
Network Cabling: 10BASE-T:
2-pair UTP Cat. 3, 4, 5 (100m)
EIA/TIA- 568 100-ohm STP (100m)
100BASE-TX:
2-pair UTP Cat. 5 (100m)
EIA/TIA-568 100-ohm STP (100m)
100BASE-FX:
Multi-mode (62.5/125µm or 50/125µm) fiber cabling with SC connector
Number of Ports: SR24n : 24 x 10/100 Mbps ports
SRmsc : 2 x 100BASE-FX ports
Physical and Environmental
AC inputs: 100 - 240 VAC, 50/60 Hz (internal universal power supply)
Power Consumption: 39 watts maximum
Operating Temperature: 32° ~ 122° F (0° ~ 50° C)
Storage Temperature: -13° ~ 131° F (-25° ~ 5 5° C)
Humidity: 5% ~ 95% non-condensing
EMI: FCC Class A, CE Mark Class A, VCCI Class A,
BSMI Class A , C-Tick Class A
Safety: UL (UL 1950), CSA (CSA950), TUV/GS (EN60950)
DC Fan: One built-in 40 x 40 x 10 mm DC fan
Dimensions: 441 x 207 x 44 mm (IU), 19-inch rack-mount width
Weight: 2.7 kg

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.)
Limits and Expectations
There are no express warranties except as listed above.
Network products by Amer.com shall not be liable for incidental or consequential damages
resulting from the use of this product. Any future upgrades, including (but not limited to)
hardware and software are not covered by this limited warranty. If a hardware problem
with this product develops during the warranty period, you may contact the Amer.com
Service Center at:
Telephone [phone]
Facsimile [phone]
Service Center
Amer.com
7259 Bryan Dairy Road
Largo, Florida
33777
U.S.A.
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