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

1
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

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duplex (FDX) mode. Otherwise, it is blinking when collisions are
occurring on the respective port.
100M Link/Activity, 10M Link/Activity (100M LINK/ACT(green),
10LINK/ACT(amber))
This indicator lights green when the port is connected to a 100Mbps
Fast Ethernet station, if the indicator blinking green will be
transmission or received data on the 100Mbps network. Otherwise, if
the indicator light amber when the port is connected to a 10Mbps
Ethernet station, if the indicator blinking amber will be transmission
or received data on the 10Mbps network.
Rear Panel
♦DC Power Jack: Power is supplied through an external AC power
adapter. Check the technical specification section for information
about the AC power input voltage. (Power Jack is on the right side
of the device)
Since the DSS-8+ does not include a power switch, plugging its
power adapter into a power outlet will immediately power it on.
♦MDI-X Jacks: Use these jacks to connect stations to the hub. These
are MDI-X (Medium-Dependent Interface, Cross-wired) jacks,
which mean, you can use ordinary straight-through twisted-pair
cables to connect user machines and servers to the hub through them.
If you need to connect another device with an MDI-X jack, such as

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another hub or an Ethernet switch, you should use a crossover cable,
or make the connection using the MDI-X jack (described below).
♦Uplink Jack(s) (MDI-II): Use this jack to connect stations to the
hub. This is an MDI-II (Medium-dependent Interface, straight-
wired) jack, which means you can connect the hub to a device with
an MDI-X port using an ordinary straight-through cable, making a
crossover cable unnecessary.

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CONNECTING THE DSS-8+
This chapter describes how to connect the DSS-8+ to your Fast
Ethernet network. In each of the following figures, the DSS-8+ is
shown.
PC to DSS-8+
A PC can be connected to DSS-8+ via a two-pair Category 3, 4, 5
UTP/STP straight cable. The PC (equipped with a RJ-45 10/100Mbps
phone jack) can be connected to any of the 8 ports (1x - 8x).
The LED indicators for PC connection depend on the LAN card’s
capabilities. If LED indicators are not lit after making a proper
connection, check the PC LAN card, the cable and the DSS-8+
conditions and connections.
The following are LED indicator possibilities for a PC to DSS-8+
connection:
1. The “100LINK/ACT,10LINK/ACT” LED indicator lights
green for hookup to 100Mbps speed or light amber for
hookup to 10Mbps speed.
2. The “Full-Duplex/Collision” LED indicator depends upon
LAN card capabilities for full duplex or half duplex.
Hub to DSS-8+
A hub (10 or 100BASE-TX) can be connected to the DSS-8+ via a
two-pair Category 3, 4, 5 UTP/STP straight cables. The connection is
accomplished from the hub uplink (MDI-II) port to any of the DSS-8+
(MDI-X) ports: 1x - 8x for the DSS-8+.

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A. 10BASE-T Hub
For a 10BASE-T hub, the DSS-8+ LED indicators should light up as
the following:
“Full-Duplex/Collision” indicator is OFF.
“100LINK/ACT,10LINK/ACT LED” indicator is light amber.
B. 100BASE-TX Hub
For a 100BASE-TX hub, the DSS-8+ LED indicators should light up
as the following:
“Full-Duplex/Collision” LED indicator is OFF.
“100LINK/ACT,10LINK/ACT” LED indicator is light green.
Hub without Uplink (MDI-II) port
If a hub is not equipped with an uplink (MDI-II) port, connection can
be made using either straight cable or crossover cable.
A. Using straight cable
When using straight cable, the connection can be made from the
uplink (MDI-II) port of the DSS-8+ to any port of the hub.
B. Using crossover cable
When using crossover cable, the connection can be made from any
(MDI-X) ports of the DSS-8+ to any port of the Hub.
DSS-8+ to switch (other devices)
The DSS-8+ can be connected to another switch or other devices
(routers, bridges, etc.) via a two-pair Category 3, 4, 5 UTP/STP
straight or crossover cable.

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A. Using straight cable
When using straight cable, this is done from the uplink (MDI-II) port
of the DSS-8+ (DSS-8+ A) to any of the 10Mbps or 100Mbps (MDI-
X) port of the other switch (switch B) or other devices.
B. Using crossover cable
When using crossover cable, this is done from any (MDI-X) port of
the DSS-8+ (DSS-8+ A) to any of the 10Mbps, 100Mbps (MDI-X)
port of the other switch (switch B) or other devices.
1. The “100LINK/ACT,10LINK/ACT” LED indicator light
green for hookup to 100Mbps speed or light amber for
hookup to 10Mbps speed.
2. The “Full-Duplex/Collision” LED indicator depends upon LAN
card capabilities for full-duplex or half-duplex
Port Speed & Duplex Mode
After plugging the selected cable to a specific port, the system uses
auto-negotiation to determine the transmission mode for any new
twisted-pair connection:
If the attached device does not support auto-negotiation or has
auto-negotiation disabled, an auto-sensing process is initiated to
select the speed and set the duplex mode to half-duplex.

INSTRUCTIONS FOR USE OF STACKING BRACKETS
First, make sure you have one pair of stacking brackets for each
device.
Next, slide one bracket onto each end of the device as shown in the
diagram below. Be sure each bracket is positioned correctly.
Note when clicking each bracket into place, the round feet on the
bottom of the device will line up with the round holes on the bracket.
The brackets are designed to fit snugly in place. Please do not force
them.
The brackets are now ready for stacking devices. See the diagram
below.

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RJ-45 PIN SPECIFICATION
When connecting your DSS-8+ to another switch, a bridge or a hub, a
modified crossover cable is necessary. Please review these products
for matching cable pin assignment.
The following diagram and tables show the standard RJ-45
receptacle/connector and their pin assignments for the switch-to-
network adapter card connection, and the straight / crossover cable for
the DSS-8+-to-switch/hub/bridge connection.
RJ-45 Connector pin assignment
Contact Media Direct Interface Signal
1 TX + (transmit)
2 TX - (transmit)
3 Rx + (receive)
4 Not used
5 Not used
6 Rx - (receive)
7 Not used
8 Not used
The standard cable, RJ-45 pin assignment

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5
The standard RJ-45 receptacle/connector
The following shows straight cable and crossover cable connection:
Straight cable for DSS-8+ (uplink MDI-II port) to switch/Hub or
other devices connection
Crossover cable for DSS-8+ (MDI-X port) to switch/hub or other
network devices (MDI-X port) connection

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TECHNICAL SPECIFICATIONS
General
Standards IEEE 802.3 10BASE-T Ethernet
IEEE 802.3u 100BASE-TX Fast Ethernet
ANSI/IEEE Std. 802.3 NWay Auto-negotiation
Protocol CSMA/CD
Data
Transfer
Rate
Ethernet: 10Mbps (half duplex), 20Mbps (full-duplex)
Fast Ethernet: 100Mbps (half duplex), 200Mbps (full- duplex)
Topology Star
Network
Cables
10BASET: 2-pair UTP Cat. 3,4,5 (100 m), EIA/TIA- 568
100-ohm STP (100 m)
100BASE-TX: 2-pair UTP Cat. 5 (100 m), EIA/TIA-568
100-ohm STP (100 m)
Number of
Ports 8 x 10/100Mbps NWay ports
Uplink Port MDI-II RJ-45 shared with port * 1, share with port 1

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Physical and Environmental
DC inputs DC7.5V/1.5A
Power
Consumption 11.25 watts. (max.)
Temperature Operating: 0°~ 50°C, Storage: -10°~ 70°C
Humidity Operating: 10% ~ 90%, Storage: 5% ~ 90%
Dimensions 190 x116 x 32 mm (W x H x D)
EMI: FCC Class B, CE Mark B, VCCI-II
Performance
Transmissio
n Method: Store-and-forward
RAM
Buffer: 256KBytes per device
Filtering
Address
Table:
16K entries per device
Packet
Filtering/For
warding
Rate:
10Mbps Ethernet: 14,880/pps
100Mbps Fast Ethernet: 148,800/pps
MAC
Address
Learning:
Automatic update