Black Box LE401A User manual

1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax [phone]
©Copyright 1992. Black Box Corporation. All rights reserved.

Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)
FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax [phone]
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: [email protected]
CUSTOMER
SUPPORT
INFORMATION
SEPTEMBER 1992
LE401A
8-Port Fanout
8-PORT FANOUT
PWR REM
TRANS
REM
RCV
REM
COLL
LOCAL
REC
LOCAL
COLL
LOCAL
SQE
PORT 8 PORT 7 PORT 6 PORT 5 PORT 4 PORT 3 PORT 2 PORT 1
SQE
ON OFF
REMOTE LOCAL
MODE

8-PORT FANOUT
2
FEDERAL COMMUNICATIONS COMMISSION
RADIO FREQUENCY INTERFERENCE STATEMENT
This equipment generates, uses, and can radiate radio frequency energy and if not installed and used properly, that is,
in strict accordance with the manufacturer's instructions, may cause interference to radio communication. It has been
tested and found to comply with the limits for a Class A computing device in accordance with the specifications in
Subpart J of Part 15 of FCC Rules, which are designed to provide reasonable protection against such interference
when the equipment is operated in a commercial environment. Operation of this equipment in a residential area is
likely to cause interference, in which case the user at his own expense will be required to take whatever measures
may be required to correct the interference.
Changes or modifications not expressly approved by the party responsible for compliance could void the user's
authority to operate the equipment.
"This digital apparatus does not exceed the Class A limits for Radio noise emission from digital apparatus set out in
the Radio Interference Regulation of the Canadian Department of Communications."
"Le présent appareil numérique n'émet pas de bruits radioélectriques dépassant les limites applicables aux appareils
numériques de la classe A prescrites dans le Règlement sur le brouillage radioélectrique édicté par le ministère des
Communications du Canada."

8-PORT FANOUT
3
CONTENTS
1.0 SPECIFICATIONS .........................................................................................................................................4
2.0 INTRODUCTION...........................................................................................................................................5
2.1 Unpacking Instructions......................................................................................................................5
2,2 System Architecture...........................................................................................................................5
2.2.1 Front Panel LED Status Indicators......................................................................................6
2.2.2 Back Panel LED Status Indicators ......................................................................................7
2.2.3 Front Panel Hardware..........................................................................................................7
2.2.4 Back Panel Hardware ..........................................................................................................8
3.0 INSTALLATION ............................................................................................................................................9
3.1 Cable Setup........................................................................................................................................9
3.2 Local Mode (Standalone Operation) .................................................................................................9
3.3 Remote Mode (Connecting to a Network).......................................................................................10
4.0 CONFIGURATION ......................................................................................................................................11
4.1 Expanding the Network ...................................................................................................................11
4.2 Cascading the 8-Port Fanout............................................................................................................11

8-PORT FANOUT
4
Standards — Ethernet V. 1 and 2, IEEE 802.3
Indicators — LEDs: (1) Power, (8) Transmit, (8) Online, (1) Local SQE, (1) Local Collision,
(1) Local Receive, (1) Remote Transmit, (1) Remote Receive, (1) Remote Collision,
(1) External Transceiver Power
Connectors — (8) DB15 AUI male, (1) DB15 AUI female
Power — 90-270 VAC, 60-50 Hz
Size — 2.6"H x 14"W x 8.5"D (6.6 x 35.6 x 21.6 cm)
Weight — 4 lb. (1.8 kg)
1.0 Specifications

CHAPTER 2: Introduction
5
The 8-Port Fanout is a device which links up to eight
Ethernet devices with AUI interfaces together. The unit
may operate in remote mode or in local mode. In local
mode, the unit operates as a standalone network (within
the 8-Port Fanout). In remote mode, the 8-Port Fanout is
attached to the network through an external transceiver.
This allows the eight devices connected to the 8-Port
Fanout to communicate with the rest of the network.
In local mode (standalone operation) the 8-Port Fanout,
can be configured to generate the heartbeat (SQE test).
To ensure that this test is not changed unknowingly, the
switch is recessed so that you need a small screwdriver
to change the setting.
If the 8-Port Fanout is in remote mode, the SQE test
switch is disabled regardless of the switch setting. The
8-Port Fanout will either pass through or not pass
through the SQE test depending on the configuration of
the external transceiver.
The 8-Port Fanout can be connected to up to two units.
One 8-Port Fanout can support up to 64 networked
devices (one cascade deep). Configuration of the 8-Port
Fanout is discussed in Chapter 4.
The 8-Port Fanout operates on a power source of 90-270
VAC .
The 8-Port Fanout is compatible on the eight host ports
with Ethernet Version 1.0 specifications, Ethernet
Version 2.0 specifications, and IEEE 802.3 standard
(1983) for a 10-Mbps Medium Access Unit. The
external transceiver port is compatible with Ethernet
Version 2.0 and IEEE 802.3 transceivers.
The 8-Port Fanout has nine DB15 cable connectors.
Ports 1-8 are for connection to host units. These eight
ports act as transceivers. The ninth connector, labeled
"To External Transceiver Only," allows the 8-Port
Fanout to be connected to an external transceiver.
The 8-Port Fanout has 24 LEDs. These LEDs are
intended to help you find both node and network
problems. These LEDs indicate system power, remote
transmit, remote receive, remote collision, local receive,
local collision, local SQE, transmit on ports 1-8, online
on ports 1-8 and power to the external transceiver.
2.1 Unpacking Instructions
Your package should contain one 8-Port Fanout (with
power cord).
Inspect your unit for any damage which may have
occurred during shipment. If you discover any shipping
damage, notify the carrier and follow his instructions for
damage and claims.
Be sure to save the original shipping carton if
reshipment is necessary.
2.2 System Architecture
The 8-Port Fanout has a total of 24 LEDs to aid in
installation and troubleshooting if any problems occur.
They also verify correct transceiver operation at a
glance. On the next page is a description of where they
are ans what they do.
2.2.1 FRONT PANEL STATUS LED INDICATORS
See Figure 2-1 for the location of the front-panel LEDs.
The numbers in the diagram correspond to the numbered
items below.
1.System Power — When lit, this LED indicates that
the correct AC voltage is being applied and the
internal power supply is operational.
2.0 Introduction

8-PORT FANOUT
6
2.Remote Transmit — When lit, this LED indicates a
packet has been received at any of the eight
transceiver ports and transmitted out through the
external transceiver. This LED is operational only
when the unit is in remote mode.
3.Remote Receive — When lit, this LED indicates a
packet has been received at the external transceiver
port and is being routed to the eight transceiver
ports. This LED is operational only when the unit is
in remote mode.
4.Remote Collision — When lit, this LED indicates a
collision on the segment to which the external
transceiver port is connected. This LED is also lit in
synchronization with the Remote Transmit LED if
the external transceiver has the SQE test enabled.
This is due to the pseudocollisions created when the
external transceiver's SQE test is working.
5.Local Receive — When lit, this LED indicates that
each of the transceiver ports is presenting a packet to
its associated DTE. Only one LED is required to
represent this function, since all of the transceiver
ports are effectively parallel for this function. This
LED will be operational in either remote or local
mode.
6.Local Collision — When lit, this LED indicates that
a collision has occurred on or between one or more
of the eight transceiver ports. Collisions between the
transceiver ports themselves will not be propagated
through to the external transceiver port, and thus
will not impede activity on the network. This LED
will be operational in either remote or local mode.
7.Local SQE — When lit, this LED indicates the SQE
test is enabled (and the unit is in local mode). If the
8-Port Fanout is in remote mode, then this LED will
be off regardless of its setting.
8.Transmit (1-8) — Each transceiver port has an
associated Transmit LED. When lit, these LEDs
indicate that the 8-Port Fanout has received a packet
from the attached DTE.
2.2.2 BACK PANEL STATUS LED INDICATORS
See Figure 2-2 for the location of the back-panel LEDs.
The numbers in the diagram correspond to the numbered
items below.
9.Online (1-8) — Each transceiver port has an
associated Online LED. When lit, these LEDs
indicate that the DTE connected to the related port
through the AUI cable, has power applied to it.
These will be lit/unlit regardless of the 8-Port
Fanout's operational status and are provided so a
DTE’s "in use" status can be ascertained before
disconnection of a cable.
87654321
Figure 2-1. Front-Panel LEDs.

CHAPTER 2: Introduction
7
10.Power to External Transceiver — When lit, this
LED indicates that there is power being supplied to
the external transceiver.
2.2.3 FRONT PANEL HARDWARE
See Figure 2-3 for the location of the front-panel
switches. The numbers in the diagram correspond to the
numbered items below.
1.Remote/Local Switch — This switch allows the
user to choose between remote mode, which allows
the 8 transceiver ports on the
8-Port Fanout to communicate to other network
devices through the external transceiver port; and
local mode, which lets the 8-Port Fanout operate as
a standalone mini-network.
2.SQE On/Off Switch — This switch allows the user
to choose between having the heartbeat or SQE test
enabled or disabled. This switch is ignored by the
8-Port Fanout if the Remote/Local switch is set to
the remote mode position.
2.2.4 BACK PANEL HARDWARE
See Figure 2-4 for the location of the back-panel
switches and ports. The numbers in the diagram
correspond to the numbered items below.
1.Transceiver Ports (1-8) — These male connectors
labeled Port 1 through Port 8 are connected to the
DTE(s) via AUI cable.
2.External Transceiver Port — This female
connector labeled "To External Transceiver Only"
is connected to an external transceiver to make
access to the rest of the network via AUI cable.
910
Figure 2-2. Back-Panel LEDs.

8-PORT FANOUT
8
3.System Power Switch and Connector — This
integrated switch and power connector labeled "AC
Power 90 to 270 VAC Auto Sensing" is used to
connect to, and turn on and off, power to the entire
system.
3.1 Cable Setup
The IEEE 802.3 standard places certain limitations on
network configuration. Careful planning before tapping
into the network will help avoid unnecessary problems.
The most important consideration is the transceiver
cable length. When operating in remote mode, make
sure that the 8-Port Fanout is within 50 meters (164 ft.)
of the external transceiver. In either local or remote
mode, the DTE(s) must also be located within 50 meters
of the 8-Port Fanout.
1 2
123
Figure 2-3. Front Panel Switches.
Figure 2-4. Back Panel Switches and Ports.

CHAPTER 3: Installation
9
NOTE
On a maximum configured network,the
total length of the AUI cable is 40
meters (131.2 ft.) measured from the
external transceiver. This means a 10-
meter (32.8 ft.) cable attached to the 8-
Port Fanout will allow runs of no more
than 30 meters to any DTE. Because
the propagation delay of the x-8000 is
approximately equal to 10 meters of
AUI cable. If a network has less than
the maximum number of repeaters,
then both the AUI cables between the
8-Port Fanout and the external
transceiver and the 8-Port Fanout and
the DTE(s) may be 50 meters in length.
Once all the cables have been laid and you have placed
the 8-Port Fanout in the location of your choice, you are
ready to begin the actual connections.
3.2 Local Mode (Standalone Operation)
Follow these steps for Local Mode operation:
1.Be sure the Remote/Local switch is in the Local
position. Configure the SQE switch to generate (on)
or not generate (off) depending on the application.
The SQE test verifies that the collision- presence
circuit and path are working. The test is gen-erated
by the transceiver after it transmits a packet from the
host. Since the collision circuitry is critical to the
function of all CSMA/ CD networks, use the SQE
Test when you can. There are two problems with
the SQE test. First, it is not part of the Ethernet
Version 1.0 specification. Therefore, Version 1.0
equipment may not function with a transceiver that
generates the SQE signal.
Second, IEEE 802.3 specifications state that IEEE
802.3 compliant repeaters must not be attached to
transceivers that generate SQE. The reason is that
these repeaters send a jam signal that prevents
redundant collisions from occurring on the network.
It is important that the transceiver or multiport
transceiver be correctly configured to work with the
Ethernet or IEEE 802.3 controller. Therefore, any
confusion as to the configuration should be
answered by the controller board user manual. In
many cases,manuals forVersion 1.0-style equipment
will not mention the SQE (heartbeat) test, if the test
is not mentioned, configure the transceiver so that
the SQE is not generated.
2.Attach the female end of the host compatible
transceiver cable to one of the 8-Port Fanout male
ports. Any port (1-8) may be used since they each
have equal priority to network access.
NOTE
The 8-Port Fanout male ports will work
with any of the Ethernet Version 1.0,
2.0 or IEEE 802.3 transceiver cables.
Make sure that the cable used matches
the host interface at the male end of
the cable.
3.Slide the slide lock to hold the cable in place. If
possible, put a strain relief on the cable so that the
weight of the cable is not entirely supported by the
slide-locking mechanism.
4.Next, plug in the 8-Port Fanout and switch the off/on
switch to the on position. The unit will power up.
Check the power LED on the front panel—it should
be lit.
5.The LED on the back of the 8-Port Fanout labeled
"Power to External Transceiver" will be lit (to
indicate there is power available to power up the
external transceiver).
6.Communications between any of the eight male
ports should now be possible. The Online LED
lights up when the corresponding port is connected
to a DTE.
3.3 Remote Mode (Connecting to a Network)
To operate in Remote Mode, follow these steps:
1.Make sure the Remote/Local switch is in the remote
position. The SQE switch will be ignored no matter
what way it is configured.
3.0 Installation

8-PORT FANOUT
10
2.Connect an external transceiver to the 8-Port Fanout
female connection labeled "To External Transceiver
Only." It is best to make the connection with an
IEEE 802.3 transceiver cable. However, if no IEEE
802.3 cable is unavailable, a Version 1.0 or Version
2.0 is acceptable.
NOTE
When you attach the cable to the
external transceiver, the heartbeat or
SQE test will be passed through by the
8-Port Fanout. If the attached
transceiver has SQE enabled, the
signal will be passed through to all
attached devices. If the transceiver
does not have SQE, or SQE is disabled,
then no signal will be passed through.
3.Next, attach a host-compatible transceiver cable to
any one of the eight male ports.
4.Plug in the 8-Port Fanout. Switch the unit on. Be
sure the power LED is lit.
5.Communication is now possible, both within the 8-
Port Fanout as well as externally to a network.
4.1 Expanding the Network
The 8-Port Fanout can be used to expand the number of
allowable stations per transceiver in an Ethernet local
area network in the following ways:
Additional stations can be attached to an Ethernet
coaxial cable segment which may have limited taps
available.
Where numerous stations are in close proximity, the
number of transceivers connected to an Ethernet coaxial
cable segment can be reduced.

CHAPTER 4: Configuration
11
The number of stations per Ethernet coaxial cable
segment can be increased, which can reduce the number
of segments required.
4.2 Cascading the 8-Port Fanout
Connection of more than eight devices to one
transceiver is possible with the 8-Port Fanout. In fact
connection of 64 devices, either in local mode or remote
mode, is possible.
1.If connection to a network is desired, follow the
steps for remote mode configuration above. If no
connection to a network is desired, follow the steps
in the local mode instructions.
2.The 8-Port Fanout can be connected to up to eight
more 8-Port Fanouts, regardless of whether or not it
is connected to an external transceiver. This allows
for up to 64 connections to one transceiver. Each
port (1-8) can connect to the external transceiver
connector of another 8-Port Fanout via an IEEE
802.3 compatible transceiver cable. It is also
possible to mix host units and 8-Port Fanouts (for
example, three male ports connected to three 8-Port
Fanouts, 5 ports connected directly to host units.)
NOTE
Connecting more than two 8-Port
Fanouts in a line (the second to the
first and the third to the second) is not
recommended. Cascading more than
two 8-Port Fanouts will result in
unacceptable amounts of jitter (signal
distortion) being introduced into the
signal causing alignment errors to
occur.
3.Power each 8-Port Fanout on. Make sure each unit
has its Power LED illuminated. If the
8-Port Fanouts are not connected to a network, the
hub 8-Port Fanout will generate or not generate SQE
for all connected devices, depending on the setting
of the SQE switch on the hub unit.
4.The 8-Port Fanouts, if connected to a network, must
all have the Remote/Local switch set to remote. The
8-Port Fanouts, if not connected to a network, must
all have Remote/Local switches set to remote with
the exception of the central 8-Port Fanout, which
must have the Remote/Local switch set to local.
Figure 4-1 shows a configuration of the 8-Port Fanout
when cascading is used.
4.0 Configuration

8-PORT FANOUT
12
AUI Cables to DTE
AUI Cables to Cascade
Trunk Cable
LE401A
LE401A
LE401A
LE401A
LE401A
LE401A
LE401A
LE401A
LE401A
Figure 4-1. Cascading The 8-Port Fanout.