D-Link DSS-8+ User manual

DSS-8+
8-port 10/100Mbps Switch
User’s Guide
Rev. 03 (MAR. 2001)
6012-9830016
Printed In Taiwan
RECYCLABLE

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TABLE OF CONTENTS
ABOUT THIS GUIDE....................................................1
PURPOSE .........................................................................................1
OVERVIEW OF THIS USER’S GUIDE ..........................................1
INTRODUCTION..............................................................2
FAST ETHERNET TECHNOLOGY ................................................2
SWITCHING TECHNOLOGY .........................................................2
FEATURES.......................................................................................4
UNPACKING....................................................................................6
SETUP ..............................................................................................6
IDENTIFYING EXTERNAL
COMPONENTS ....................................................................7
FRONT PANEL.............................................................................7
LED INDICATORS.........................................................................7
REAR PANEL................................................................................8
CONNECTING THE DSS-8+................................10
PC TO DSS-8+ ............................................................................10
HUB TO DSS-8+..........................................................................10
A. 10BASE-T Hub...................................................................11
B. 100BASE-TX Hub .............................................................11
HUB WITHOUT UPLINK (MDI-II) PORT.................................11
A. Using straight cable.............................................................11
B. Using crossover cable .........................................................11

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DSS-8+ TO SWITCH (OTHER DEVICES)..................................11
A. Using straight cable.............................................................12
B. Using crossover cable .........................................................12
PORT SPEED & DUPLEX MODE ...............................................12
INSTRUCTIONS FOR USE OF STACKING
BRACKETS............................................................................13
RJ-45 PIN SPECIFICATION................................14
TECHNICAL SPECIFICATIONS....................16

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ABOUT THIS GUIDE
Congratulations on your purchase of the DSS-8+. This device
integrates 100Mbps Fast Ethernet and 10Mbps Ethernet network
capabilities in a highly flexible desktop package.
Purpose
The purpose of this manual is to show you how to install and
configure your DSS-8+.
Overview of this User’s Guide
♦Chapter 1, Introduction. Describes the DSS-8+ and its features.
♦Chapter 2, Unpacking and Setup. Helps you get started with the
basic installation of the DSS-8+.
♦Chapter 3, Identifying External Components. Describes the front
panel, rear panel and LED indicators of the DSS-8+.
♦Chapter 4, Connecting the DSS-8+. Tells how you can connect the
DSS-8+ to your Ethernet network.
♦Appendix A, Technical Specifications. Lists the technical (general,
physical and environmental, and performance)
specifications of the DSS-8+.
♦Appendix B, RJ-45 Pin Specification. Describes the RJ-45
receptacle/connector and the straight and crossover
cable connector.

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INTRODUCTION
This chapter describes the features of the DSS-8+ and some
background information about Ethernet/Fast Ethernet switching
technology.
Fast Ethernet Technology
The growing importance of LANs and the increasing complexity of
desktop computing applications are fueling the need for high
performance networks. A number of high-speed LAN technologies
have been proposed to provide greater bandwidth and improve
client/server response times. Among them, 100BASE-T (Fast
Ethernet) provides a non-disruptive, smooth evolution from the
current 10BASE-T technology. The non-disruptive and smooth
evolution nature, and the dominating potential market base, virtually
guarantee cost effective and high performance Fast Ethernet solutions
in the years to come.
100Mbps Fast Ethernet is a new standard specified by the IEEE 802.3
LAN committee. It is an extension of the 10Mbps Ethernet standard
with the ability to transmit and receive data at 100Mbps, while
maintaining the CSMA/CD Ethernet protocol. Since the 100Mbps
Fast Ethernet is compatible with all other 10Mbps Ethernet
environments, it provides a straightforward upgrade and takes
advantage of the existing investment in hardware, software, and
personnel training.
Switching Technology
Another approach to pushing beyond the limits of Ethernet technology
is the development of switching technology. A switch bridges

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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 dividing a local area
network into different segments, which don’t compete with each other
for network transmission capacity.
The DSS-8+ acts as a high-speed selective bridge between the
individual segments. The DSS-8+, without interfering with any other
segments, automatically forwards traffic that needs to go from one
segment to another. By doing this the total network capacity is
multiplied, while still maintaining the same network cabling and
adapter cards.
For Fast Ethernet networks, a DSS-8+ is an effective way of
eliminating problems of chaining hubs beyond the “two-repeater
limit.” A DSS-8+ can be used to split parts of the network into
different collision domains, making it possible to expand your Fast
Ethernet network beyond the 205-meter network diameter limit for
100BASE-TX networks. DSS-8+s supporting both traditional
10Mbps Ethernet and 100Mbps Fast Ethernet are also ideal for
bridging between the existing 10Mbps networks and the new
100Mbps networks.
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, the setup and maintenance required
make routers relatively impractical. Today switches are an ideal
solution to most kinds of local area network congestion problems.

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Features
The DSS-8+ was designed for easy installation and high performance
in an environment where traffic on the network and the number of
users increase continuously.
The DSS-8+ with its small, compact size was specifically designed for
small to middle workgroups. The DSS-8+ can be installed where
space is limited; moreover, the DSS-8+ provides immediate access to
a rapidly growing network through a wide range of functions.
The DSS-8+ is ideal for deployment with multiple high-speed servers
for shared bandwidth 10Mbps or 100Mbps workgroups. With the
highest bandwidth 200Mbps (100Mbps full-duplex mode), any port
can provide workstations with a congestion-free data pipe for
simultaneous access to the server.
The DSS-8+ is expandable by cascading two or more DSS-8+s
together. As all ports support 200Mbps, the DSS-8+ can be cascaded
from any port and to any number of DSS-8+s.
The DSS-8+ is a perfect choice for sites planning to upgrade to Fast
Ethernet in the future. Ethernet workgroups can connect to the DSS-
8+ now, and you can change adapters and hubs anytime later without
needing to change the DSS-8+s or reconfigure the network.
The DSS-8+ combines dynamic memory allocation with store-and-
forward switching to ensure that the buffer is effectively allocated for
each port, while controlling the data flow between the transmit and
receive nodes to guarantee against all possible packet loss.
The DSS-8+ is a managed 10/100 Fast Ethernet switch that offers
solutions in accelerating small Ethernet workgroup bandwidth. Other
key features are:
 Uplink/ MDI-II (media dependent interface) port for uplink to
another switch, hub or repeater.

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 Store and forward switching scheme capability. As the result of
complete frame checking and error frame filtering, this scheme
prevents error packages from transmitting among segments.
 NWay Auto-negotiation for any port. This allows for auto-
sensing of speed (10/100Mbps) thereby providing you with
automatic and flexible solutions in your network connections.
 Flow control for any port. This minimizes dropped packets by
sending out collision signals when the port’s receiving buffer is
full. Note that flow control is only available in half duplex
mode.
 Data forwarding rate per port is at wire-speed for 100Mbps
speed.
 Data forwarding rate per port is at wire-speed for 10Mbps speed.
 Data filtering rate eliminates all error packets, runts, etc., per
port at wire-speed for 100Mbps speed.
 Data filtering rate eliminates all error packets, runts, etc., per
port at wire-speed for 10Mbps speed.
 16K MAC address entries table per device for the DSS-8+.
 256 KB RAM buffer per device for the DSS-8+.
 Network looped detecting.

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Unpacking and Setup
This chapter provides unpacking and setup information for the
DSS-8+.
Unpacking
Open the box and carefully unpacks its contents. The box should
contain the following items:
♦One DSS-8+
♦One external power adapter
♦One pair of Stacking Brackets
♦This User’s Guide.
If any item is found missing or damaged, please contact your local
reseller for replacement.
Setup
The setup for the DSS-8+ can be performed using the following steps:
 The surface must support at least 1.5 Kg for the DSS-8+.
 The power outlet should be within 1.82 meters (6 feet) of the
DSS-8+.
 Visually inspect the DC power jack and make sure that it is fully
secured to the power adapter.
 Make sure that there is proper heat dissipation from and
adequate ventilation around the DSS-8+. Do not place heavy
objects on the DSS-8+.

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IDENTIFYING EXTERNAL COMPONENTS
This section identifies all the major external components of the
DSS-8+. Both the front and rear panels are shown followed by a
description of each panel feature. The indicator panel is described
in detail in the next chapter.
Front Panel
The figure below shows the front panel of the DSS-8+.
♦LED Indicator Panel
Refer to the LED Indicator section for detailed information about
each of the DSS-8+’s LED indicators.
LED Indicators
Power Indicator (PWR)
This indicator lights green when the hub is receiving power, otherwise,
it is off.
Loop Detect (LOOP)
When this indicator lights amber, it means that there is a loop detected,
then the network needs to be re-configuration.
Full-Duplex/Collision (Full-Duplex/Collision)
This LED indicator lights green when a respective port is in full