Black Box LE14XXA User Manual

Black Box Modular Switches Installation and User Guide (8/99)

April 1999

LE14XXA

Modular Switches

Customer Call our Technical Support Specialists to discuss your application.

Support For 24-hour technical support: Call [phone] or Fax: [phone]

Information To order: Call [phone] 7:00 A.M. to 8:00 P.M. EST

Mail order: Black Box Corporation. 1000 Park Drive, Lawrence, PA 15055

i

Black Box Modular Switches Installation and User Guide (8/99)

Black Box

Modular Switches

Installation and User Guide

Trademarks

UL is a registered trademark of Underwriters Laboratories

Important: The LE14XXA Modular Switches contain no user-serviceable parts. Attempted
service by unauthorized personnel shall render any and all warranties null and void. If
problems are experienced with an LE14XXA, consult Section 6, Troubleshooting, of this User
Guide.

1999 Black Box Corporation

Printed in the United States of America.

______________________________________________________

Contacting Black Box Corporation

Please use the mailing address and phone and fax numbers listed below:

Black Box Corporation

1000 Park Drive

Lawrence, PA 15055

Phone: [phone]

Fax: [phone]

P/N 84-00020 (Rev A 08/99)

ii

Black Box Modular Switches Installation and User Guide (8/99)

from digital apparatus set out in the Radio Interference Regulation of the Canadian

FCC STATEMENT

FEDERAL COMMUNICATIONS COMMISSION

AND

CANADIAN DEPARTMENT OF COMMUNICATIONS

RADIO FREQUENCY INTERFERENCE STATEMENTS

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 necessary 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

Department of Communications.

Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les
limites applicables aux appareils numériques de classe A prescrites dans le
Règlement sur le brouillage radioélectrique publé par le ministère des
Communications du Canada.

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Black Box Modular Switches Installation and User Guide (8/99)

NORMAS OFICIALES MEXICANAS (NOM)

ELECTRICAL SAFETY STATEMENT

INSTRUCCIONES DE SEGURIDAD

1. Todas las instrucciones de seguridad y operación deberán ser leídas antes de que el

aparato eléctrico sea operado.

2. Las instrucciones de seguridad y operación deberan ser guardadas para referencia futura.

3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de operación deben

ser respetadas.

4. Todas las instrucciones de operación y uso deben ser seguidas.

5. El aparato eléctrico no deberá ser usado cerca del agua—por ejemplo, cerca de la tina de

baño, lavabo, sótano mojado o cerca de una alberca, etc..

6. El aparato eléctrico debe ser usado únicamente con carritos o pedestales que sean

reconnendados por el fabricante.

7. El aparato eléctrico debe ser montado a la pared o al techo sólo como sea recommendado

por el fabricante.

8. Servicio—El usuario no debe intentar dar sercicio al equipo eléctrico más allá a lo descrito

en las instrucciones de operatión. Todo otro servicio deberá ser referido a personal de
servicio calificado.

9. El aparato eléctrico debe ser situado de tal mannera que su posición no interfiera su uso.

La colocación del aparato eléctrico sobre una cama, sofá, alfombra o superficie similar
puede bloquea la ventilación, no se debe colocar en libreros o gabinetes que impidan el
flujo de aire por los orificios de ventilación.

10. El equipo eléctrico deber ser situado fuera del alcance du fuentes de calor como radiadores,

registros de calor, estufas u otros aparatos (incluyendo amplificadores) que producen
calor.

11. El aparato eléctrico deberá ser connectado una fuente de poder sólo del tipo descrito en el

instrucivo de operación, o como se indique en el aparato.

12. Precaución debe ser tomada de mal manera que la tierra fisica y la polarización del equipo

no sea eliminada.

13. Los cables de la fuente de poder deben ser guiados de tal manera que no sean pisados ni

pellizcados por objetos colocados sobre o contra ellos, poniendo particular atención a los
contactos y receptáculos donde salen del aparato.

14. El equipo eléctrico debe ser limpiado únicamente de acuerdo a las recommendaciones del

fabricante.

15. En caso de existir, una antena externa deberá ser localizada lejos de las lineas de energia.

16. El cable de corriente deberá ser desconectado del cuando el equipo no sea usado por un

largo periodo de tiempo.

17. Cuidado debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la

cubierta u orificios de ventilación.

18. Servicio por personal calificado deberá ser provisto cuando:

A: El cable de poder o el contacto ha sido dañado; u
B: Objectos han caído o líquido ha sido derramado dentro del aparato; o
C: El aparato ha sido expuesto a la lluvia; o
D: El aparato parece no operar normalmente o muestra un cambio en su

desempeño; o

E: El aparato ha sido tirado o su cubierta ha sido dañada.

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Black Box Modular Switches Installation and User Guide (8/99)

TABLE OF CONTENTS PAGE

1. SPECIFICATIONS.........................................................................................................1

1.1 Technical Specifications........................................................................................1

1.2 Model Information................................................................................................4

2. INTRODUCTION..........................................................................................................5

2.1 Inspecting the Package and Product......................................................................5

2.2 Product Description - Black Box Modular Switches...........................................6

2.2.1 Modular Switch chassis models ................................................................5

2.2.2 4-port modules, 100Mb fiber ...................................................................7

2.2.3 4-port module, 10 Mb fiber ......................................................................7

2.2.4 4-port module, RJ-45 (copper) ................................................................8

2.2.5 4-port modules, “3 + 1” , 3@RJ-45 and 1@fiber.....................................8

2.2.6 Frame Buffering and Latency ....................................................................9

2.3 Features and Benefits..........................................................................................11

2.4 Applications........................................................................................................12

3. INSTALLATION.........................................................................................................15

3.1 Locating the LE14XXA-Series Switches ............................................................15

3.2 Connecting Ethernet Media.................................................................................16

3.2.1 Connecting Fiber Optic ST-type “twist-lock”.........................................16

3.2.2 Connecting Fiber Optic SC-type “snap-in”..............................................17

3.2.3 Connecting Fiber Optic Single-Mode........................................................17

3.2.4 Connecting Twisted- Pair, RJ-45..............................................................17

3.3 Table-top or shelf mounting................................................................................18

3.3.1 Wall (or Vertical) Mounting..................................................................18

3.3.2 Rack-Mounting .....................................................................................18

3.4 Copper ports, Inernal jumper settings for 10/100Mbps ...................................19

3.5 Fiber ports, Internal Jumper settings for 100Mbps ..........................................20

3.6 Combo ports, Internal Jumper settings for RJ-45 & fiber 10 or 100Mbps .......21

3.7 Fiber ports, Internal Jumper settings for 10Mbps ............................................22

3.8 Powering the LE14XXA-Series Switches...........................................................23

3.9 4-port Module (4PM) Installation......................................................................24

3.9.1 Preparation for installing, changing and removing 4PMs......................24

3.9.2 Installing 4PM cards in the LE14XXA-Series chassis..........................26

3.9.3 Removing 4PM cards in the LE14XXA-Series chassis ........................27

4. OPERATION................................................................................................................29

4.1 Switching Funtionality........................................................................................29

4.2 Status LEDs........................................................................................................30

4.3 Manual switches for Up-link and Full/Half Duplex...........................................30

4.4 Auto-negotiation option for copper Fast Ethernet ports ..................................30

4.5 Auto-negotiation option for 10 Mbps ports HDX/FDX mode ........................32

4.6 Collision based flow control................................................................................32

4.7 Power budget Calculation for LE14XXA-Series 4PM’s Fiber media ................33

5. 4-PORT MODULES (AS SEPARATE ITEMS IN A SHIPMENT)................................34

5.1 Inspecting the Package and Product ...................................................................34

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Black Box Modular Switches Installation and User Guide (8/99)

5.2 Product Description ...........................................................................................34

5.2.1 LE1428C, 100Mb multi-mode FX-ST, “twist lock” connector...............35

5.2.1a LE1424C, 10 Mb multi-mode FL-ST, “twist-lock” connector...............35

5.2.2 LE1419C, 100Mb multi-mode FX-SC, “snap-in” connector..................36

5.2.3 LE1421C, 100Mb single-mode FX-SC, “snap-in” connector...................36

5.2.4 LE1422C, 100Mb FX Small-Form-Factor “plug-in” connector...............37

5.2.5 LE11423C, 100Mb FX Small-Form-Factor “plug-in” connector.............37

5.2.6 LE1425C, 10/100Mbps (RJ-45 for standard twisted-pair)......................38

5.2.7 LE1426C, “3TP+1F” Combo (Twisted Pair and 100Mb Fiber SC mm).39

5.2.8 LE1427C, “3TP+1F” Combo (Twisted Pair and 100Mb Fiber ST mm).39

5.2.9 LE1429C, “3TP+1F” Combo (Twisted Pair and 100Mb Fiber SC sglm)40

5.2.10 4PM -FP (Face Plate) ..............................................................................40

6.0 TROUBLESHOOTING.....................................................................................41

6.1 Before Calling for Assistance..............................................................................41

6.2 When Calling for Assistance...............................................................................41

6.3 Shipping and Packaging Information...................................................................42

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1. SPECIFICATIONS

1.1 Technical Specifications
Performance

Aggregate Filtering Rate: 2,380,800 frames/sec for 16 100Mbps ports
(for LE1416A)
(all ports are wire speed) 1,190,400 frames/sec for 8 100Mbps ports
(for LE1401A & LE1408A)
Aggregate Forwarding Rate: (for Modular Switch Fast Ethernet ports)
(all ports are wire speed) 1,190,400 frames per second, 16-port units
595,200 frames per second, 8-port units

Data Rate: 10 Mbps and 100Mbps
Address Table Capacity: 24K node addresses (12K on 8-port
models), with address aging
Packet buffer Size : 8 MB dynamic (4MB for 8-port)
Latency: 5 µs + packet time (100 to 100Mbps)
15 µs + packet time (10 to 10 Mbps, and 10 to 100Mbps)
Network Standards
Ethernet V1.0/V2.0 IEEE 802.3: 10BASE-T,
IEEE 802.3u: 100BASE-TX, 100BASE-FX

Maximum 10 Mbps Ethernet Segment Lengths
Unshielded twisted pair - 100 m (328 ft)
Shielded twisted pair - 150 m (492 ft)
10BASE-FL multi-mode fiber optic - 2 km (6,562 ft)
10BASE-FL single-mode fiber optic - 10 km (32,810 ft)

Maximum Standard Fast Ethernet Segment Lengths:
10BASE-T (CAT 3, 4, 5 UTP) - 100 m (328 ft)

100BASE-TX (CAT 5 UTP) - 100 m (328 ft)
Shielded twisted pair - 150 m (492 ft)

100BASE-FX, half-duplex, multi-mode - 412 m (1350 ft)
100BASE-FX, full-duplex, multi-mode - 2.0 km (6,562 ft)
100BASE-SX, short wavelength HDX m.m. - 300 m ( 935 ft)

100BASE-FX, half-duplex, single-mode - 412 m (1350 ft)

100BASE-FX, full-duplex, single-mode - 15.0 km (49,215 ft)

Connectors for copper wiring
Twisted Pair at 10/100Mb: RJ-45 shielded, female, front mounted
(for LE14XXA-Series Fast Ethernet copper ports, use Cat 5 cable)

Fiber Multi-mode connector types:

Fiber Port, SC-type (snap-in): Fiber optic multi-mode, 100BASE-FX

Fiber Port, ST-type (twist-lock): Fiber optic multi-mode, 100BASE-FX

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Installation and User Guide (8/99)

Fiber Port, MTRJ-type (plug-in):Fiber optic multi-mode, 100BASE-FX
Fiber Port, VF-45 type (plug-in): Fiber optic multi-mode, 100BASE-FX
Fiber Port, ST-type (twist-lock): Fiber optic multi-mode, 10ASE-FL

Fiber Single-mode connector types:

Fiber Port, SC-type: Fiber optic single-mode, 100BASE-FX

Manual switch-selections and jumpers
Up -link Push-button: Crossover sw for one RJ-45 port per LE1425C

Fiber default: Full-duplex (Internal jumpers may select HDX mode)
Copper default: Auto-negotiation (Internal jumpers may alternatively

-duplex, or fixed 100Mbps half-duplex)

LEDs: Per Port
LK: Steady ON when media link is operational

ACT: ON with receiver port activity
FDX/HDX: ON = Full-Duplex Mode
OFF = Half-Duplex Mode
100/10: ON = 100Mbps speed
OFF = 10 Mbps

Operating Environment

Ambient Temperature: 32° to 120° F (0° to 50°C)
Storage Temperature: -5°to 140°F (-20°to 60°C)
Ambient Relative Humidity: 10% to 95% (non-condensing)

Packaging

Enclosure:Rugged High strength metal. Suitable for stand-alone or rack-mounting

Dimensions: 1.75 in H x 17.0 in W x 9.0 in D (9.0 in W for QS580)

4.45cm H x 43.2cm W x 22.9cm D (22.5 cm W for QS580)
Weight: 4.0 lb. (1.8 Kg) for rack-mount models, 2.5 lb. for table-top
Cooling method: Fan cooled, @ 9 cfm

Power Supply (Internal)

AC Power Connector: IEC-type, male recessed, rear of chassis, with adjacent
manual ON-OFF switch (on AC model only)
Input Voltage: 110 to 240 VAC (auto-ranging)

Input Frequency: 47 to 63 Hz (auto-ranging)
Power Consumption: 20 watts typical (8 port model)
35 watts typical (16 port model)
Redundant power supplies available as options

48VDC Power Supply (Optional)

Power Input Voltage : 36 to 70 VDC (auto ranging)

Terminal Block in rear: “-, GND, +”

Power Consumption: same as for AC models, see above

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Black Box Modular Switches Installation and User Guide (8/99)

For Dual Source and Redundant DC supply options, see Appendices

For optional 23” Telco rack-mount brackets, order Model # RMB-23W
Agency Approvals

UL listed (UL1950), cUL, CE
Emissions meet FCC Part 15 Class A

Warranty Three years, return to factory Made in USA

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Installation and User Guide (8/99)

Model Information

Black Box Modular Switches

MODEL DESCRIPTION

LE1401A 8-port 10/100 Switch, holds up to two 4-port Modules with 4

LE1408A Same as Model LE1401A Switch, but in a 19” rack-mount package,

LE1416A Same as Model LE1408A, but with 24K-node address table and

LE14XXA-Series 4Port Modules
LE1419C Fiber module for LE14XXA-Series Switches, with four 100Mbps

LE1428C Fiber module for LE14XXA-Series Switches, with four 100Mbps

LE1421C Fiber module for LE14XXA-Series Switches, with four 100Mbps

LE1422C Fiber module for LE14XXA-Series Switches, with four 100Mbps

LE1423C Fiber module for LE14XXA-Series Switches, with four 100Mbps

LE1424C Fiber module for LE14XXA-Series Switches, with four 10 Mbps

LE1425C RJ-45 module for LE14XXA-Series Switches, with four 100Mbps

LE1426C 3TP+1F module for LE14XXA-Series Switches, with three

LE1427C 3TP+1F module, same as LE1426C but with fiber ST-type multi-

LE1429C 3TP+1F module, same as LE1426C but with fiber SC-type single-

switched ports each. Shelf or table-top mounting. For mixed-media
flexibility, combinations of RJ-45 and various fiber port connector
types, modes, and speeds can be configured. Full speed filtering
and forwarding at 100Mbps speed across all ports, self-learning
12K-node address table, and large 4MB packet buffers. Front­mounted LEDs, internal auto-ranging power supply

with mounting brackets.

8MB packet buffers. Holds up to four 4-port Modules (4PMs),
19” rack-mount package, with mounting brackets.

multi-mode FX SC connectors

multi-mode FX ST connectors

single-mode FX SC connectors

multi-mode FX “MTRJ” connectors

multi-mode FX “VF-45” connectors

multi-mode FL ST-type connectors

auto-negotiating RJ-45 ports, one of which has an up-link push­button

10/100MB auto-negotiating RJ-45 ports and one fiber port with
100Mbps multi-mode FX SC connector

mode connector

mode connector

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Black Box Modular Switches Installation and User Guide (8/99)

A

Remove the items from the shipping container. Be sure to keep the shipping container

contact Black Box. If the unit needs to

2. Introduction

2.1 Inspecting the Package and Product

Examine the shipping container for obvious damage prior to installing this product;
notify the carrier of any damage which you believe occurred during shipment or delivery.
Inspect the contents of this package for any signs of damage and ensure that the items listed
below are included.

This package should contain:

1 LE1401A, LE1408A, LE1416A Modular Switches
1 AC Power Cord (U.S. and other 115 VAC only)
1 Set of two wall-mounting brackets (for LE1401A Model only)
1 Set of metal “Ears” for optional “19” rack mounting (for LE1408A & LE1416

only)
1 Installation and User Guide (this manual),

should you need to re-ship the unit at a later date.
In the event there are items missing or damaged,

be returned, please use the original shipping container if possible. Refer to Section 6,
Troubleshooting, for specific return procedures.

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Installation and User Guide (8/99)

Product Description , 8-port and 16-port Modular Switches

Black Box LE14XXA series Modular Switches boost the performance of large Ethernet

-pair switched ports. Their “mixed-

lity provides for a variety of configurations including various types of fiber port

-45 (copper) ports in the same

-Port modules that can be integrated with a base

-media requirements for a 10/100 Switch product.
The Black Box LE14XXA-Series provide the switching speed and the reliability to

Box LE14XXA-Series

-Port Modules) for fiber types and for copper, as well as “3+1” combo (3 RJ-45 and

-Port Modules can be configured into a LE14XXA-Series Switch

-Series

Designed for use in departments with multiple workgroups, in remote offices and in

-Series Switches are easy to install and use. Addresses of

-mounted LEDs provide status information on each port.

-Series Switches provide high performance plug-and-play operation in convenient

-top and rack-mount packages.

LE14XXA-Series chassis models

The LE14XXA-Series Modular Switches come in three chassis sizes, an 8-port table-

-port rack-mount, and a 16-port rack-mount. Each is configurable with a selection of

-port (i.e., 4-port) modules, providing the capability of 4, 8, 12, and 16 switched ports. The

The 8-port LE1401A table-top chassis is compact in size and suitable for shelf-

-mountable

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Black Box Modular Switches Installation and User Guide (8/99)

mount units are typically used in larger network wiring

port LE1416A

-

Switches with two or four 4-port slots in the front, i.e., with a capacity of 8 or 16 switched
ports. The LE1408A and LE1416A rack­centers.

PWR ACT

Black Box LE1401A

FDX/HDX

Black Box LE1401A

Modular Switches

LK

1
2
3
4

8 Ports Table-Top

Fiber Switch

x

LK

1 2 3 41 2 3 4

ACT

100/10

FDX/HDX

Figure 2.2.1a: Front view, 8-port LE1401A
table-top, 8-port LE1408A and 16-

Modular Switches

Black Box LE1408A

Modular Switch

Fiber Switch

PWR

FDX/HDX

LK

1 2 3 4 1 2 3 4

1
2
3
4

LKACT

ACT

FDX/HDX

100/10

8-Port Rack Mount

ACT

FDX/HDX

Magnum QS5116

Magnum QS5116

Modular Switch

Fiber Switch

GARRETT
GARRETT

PWR

FDX/HDX

1
2
3
4

1 2 3 4

LK ACT

16-Port Rack Mount

FDX/HDX

1 2 3 4

ACT

LK

1
2
3
4

x

1 2 3 4 1 2 3 4ACT

LK

100/10 FDX/HDX

FDX/HDXBlack Box LE1416A

LK

1

2
3
4

ACT

Mixed-media combination modules (4-port modules with three fiber ports and one
twisted-pair port) are supported in all of the LE14XXA-Series Fiber Switch models. All 4Port
module manual-selection switches and LED’s are located on the front panel, with the IEC
standard AC power connector (and a manual ON - OFF power switch) located at the rear. Fan
driven cooling air flows left to right.

110-220

47-63Hz

1.0-0.5A

ON

VAC

OFF

110-220

47-63Hz

1.0-0.5A

ON

VAC

OFF

Figure 2.2.1b: Rear view - Black Box table-top & rack-mount 4-Series Switches

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Installation and User Guide (8/99)

-port modules, 100Mb fiber

FDX/HDX

1
2

3

4

1 2 3 4

ST-Type

ACTLK

ACT

FDX/HDX

1 2 3 4

1

LK

2
3
4

VF45-Small Form Factor

FDX/HDX

1
2
3

4

1 2 3 4

LK

ACT

1 2 3 4

LK

1
2

3
4

ACT

FDX/HDX

MTRJ-Small Form Factor

SC-Type

-Port Modules, LE1420C, LE1419C LE1423C LE1422C

In a fiber 4-port module, all of the fiber ports are of the same speed, the same multi- or

-mode, and the same connector type. Multi-mode 100Mbps models are available with ST,

-45 connectors. Single-mode 100Mbps models are available with SC

The 100Mb fiber 4-port modules on the Black Box LE14XXA-Series normally are set

-duplex mode for best fiber distance and performance. On the

-Series, the user may select full- or half-duplex mode per-port with an internal jumper

On Black Box fiber 4PMs, there are three LED’s per fiber port. The Link (LK) LED

eration” when lit, another LED indicates operation in full-duplex mode

-duplex), and an LED indicates Receiving Activity

-port modules, 10 Mb fiber

The 10 Mb model LE1424C fiber 4-port

8C, except

FDX/HDX

1

2
3

4

1 2 3 4

ACTLK

ST-Type

-FL standard, i.e., 2Km distance for multi-mode fiber.

-mode for 10km distance may be available as a special order).

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Black Box Modular Switches Installation and User Guide (8/99)

duplex mode at 10 Mb or at 100Mb speed if the device at the other

’s for each port. The LK (Link) indicates

“ready for operation” when lit, the ACT (Activity) indicates receiving activity on that port, the

45 10/100Mb port and a proper link (LK lit) must be made with the device at the other

on each

X) push

2.2.4 4-Port Module, RJ-45 (copper)

The Black Box LE14XXA-

1 2 3 4

LK

ACT

Series copper port module, model
LE1425C, provides four 10/100Mb

x

100/10 FDX/HDX

switched. RJ-45 ports. The 10/100Mb
switched ports are independently N-way auto-negotiating LE1425C

for operation at 10 or 100Mb speed in full- or half-duplex mode (as a default setting). They
independently move to half­end of the twisted pair cable is half-duplex or is not an auto-negotiating device.

On the model LE1425C , there are four LED

10/100 LED indicates operation at 100Mb speed when ON and at 10 Mb speed when OFF
(when auto-negotiation is not disabled), and the FDX/HDX LED is ON to indicate full-duplex
operation and OFF, to indicate half-duplex mode. A twisted pair cable must be connected into
each RJ­end of the cable in order for the LEDs to provide valid indications of operating conditions.

Internal jumper settings (See Section 3.4) allow technicians to over-ride the auto­negotiation feature and to manually set each port at full-duplex or half-duplex. One port
RJ-45 4-port module is equipped with a Media Dependent Interface-Crossover (MDI­button switch to simplify cascaded or up-link connections.

2.2.5 Combo 4 Port Modules, “3 + 1”, 3 RJ-45 and 1 fiber port

The combo 4-port modules are

LK

1 2 3 4

combination of copper and fiber media,
available as three 10/100 switched RJ-45

FDX/HDX

100/10

FDX/HDX

copper ports and one 100Mb switched
multi-mode fiber ST or SC port or single-mode SC port.
LE1426C

9

ACT

Installation and User Guide (8/99)

The RJ-45 ports run at 10/100Mbps with N-way auto-negotiation capability, whereas

- or full-duplex capability manually selected. The

-duplex. Internal jumpers settings allow technicians to set the 100Mb

-duplex mode. (See Section 3.4).

XA Combo 4-port modules, there are three LED’s for each RJ-45 port, which indicate

for the Fiber 4-

Frame Buffering and Latency

The Black Box LE14XXA-Series are store-and-forward switches. Each frame (or

ry and inspected before forwarding can occur. This

to be used for valid information.

While other switching technologies such as "cut-through" or "express" impose minimal

-through" technique permits collision fragment frames, which are a result of

indiscriminate cut-through forwarding is greater traffic congestion, especially at peak

-and-forward operation is that more bandwidth is available for good packets when the traffic

To minimize the possibility of dropping frames on congested ports, each Black-Box

-Series Switches dynamically allocates buffer space from an 8 MB memory pool,
y large buffer space for packet storage. (Many other

.) The other two LE14XXA-Series Switches LE1408A and LE1416A dynamically

-Series unit to be applied to all traffic

s, even when the traffic activity is unbalanced across the ports. Since the traffic on an

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Black Box Modular Switches Installation and User Guide (8/99)

duplex only) PAUSE packets out to the devices sending packets to cause

is tells the sending devices to temporarily stop sending traffic, which allows a

based flow

queue space is low, the Switch prevents more frames from entering by forcing a collision

speed types,

forward switches. For 10

100Mb forwarding, the latency is 5

LE14XXA-Series Switches are constantly adapting internally to provide maximum network
performance with the least dropped packets.

When the Switch detects that its free buffer queue space is low, the Switch sends
industry standard (full­“flow control”. Th
traffic catch-up to occur without dropping packets. Then, normal packet buffering and
processing resumes. This flow-control sequence occurs in a small fraction of a second and is
transparent to an observer. See Section 4.6 for additional details.

Another feature implemented in LE14XXA--Series Switches is a collision­control mechanism (when operating at half-duplex only). When the Switch detects that its free
buffer
signal on all receiving half-duplex ports in order to stop incoming traffic.

The latency (the time the frame spends in the Switch before it is sent along or
forwarded to its destination) of the LE14XXA-Series Switches varies with the port­and the length of the frame is a variable here as it is with all store-and­Mb-to-10 Mb or 10 Mb-to-100Mb or 100Mb-to-10 Mb forwarding, the latency is 15
microseconds plus the packet time at 10 Mb. For 100Mb-to­microseconds plus the packet time at 100Mb.

11

Installation and User Guide (8/99)

Features and Benefits

n 100Mb switching services for large, high performance Ethernet LANs
LE14XXA-Series Switches provide Fast Ethernet switching on all ports. They

perform high speed filter/forward operations on the traffic, giving each port’s
segment a full 100Mb (or 10 Mb) of bandwidth.

n Configurable with fiber ports, all connector types and speeds

4-port modules are available with 100Mb mm ST, SC, VF-45, MTRJ single-mode

SC, and 10 Mb ST-type connectors. The configuration of the fiber ports, in the
factory or in the field, allows the LE14XXA-Series Switches to adapt to mixed
and changing fiber types in any application.

n Configurable with RJ-45 (copper) ports, 10/100 auto-negotiation
RJ-45 4-port modules provide twisted pair segment connections, with N-way

auto-negotiation or with manual speed and mode settings per port

n Mixed-media configurations for maximum flexibility
Combinations of port module types can be configured in the same unit, adapting

the LE14XXA-Series Switches to varying quantities and types of fiber vs. copper
media. Port module changes can even be done in the field.

n Full-duplex or Half-duplex operation, auto-sensing

All fiber and RJ-45 (copper) ports are capable of half- or full-duplex, individually

selected. All RJ-45 ports support 10/100 auto-negotiation, or can be user-selected
for the desired operating mode and speed.

n 16-port, 12-port, 8-port and 4-port models

With two chassis sizes (16-port and 8-port) configurable with 4-port 4PMs,

capacity options complement the mixed-media configurability.

n Plug-and-Play installation for high performance switching

Black Box LE14XXA-Series Switches are self-learning for node addresses.
They can be placed into operation without complex set-up procedures, even in
large networks. They operate transparent to system software.

n Front-mounted LEDs, world-wide AC power supply
Front panel LED’s on each 4-port module display the status of each

port for easy monitoring. An internal auto-ranging AC power supply
allows LE14XXA Series Switches to be used throughout the world. (A 48VDC
power supply is optional, see Appendix B).

12

Black Box Modular Switches Installation and User Guide (8/99)

Series Modular Switches offer high performance and flexibility,

connect a series of subnets

AN traffic center. The subnet connections may

a group of users who share one 10 Mb traffic domain. The LE1401A 4port Series

providing greatly increased bandwidth. In this case, two 100Mb fiber connections are required to

nectivity so that all 10 Mb and 100Mb

play switched network facility.

.2.4 Applications
Black Box LE14XXA-

and are easily used in a variety of applications including client/server computing, performance
upgrades of departmental networks, and collapsed backbone applications. The Dual-Speed
characteristic of the LE14XXA-Series Switches enables them to inter­(one subnet per LE14XXA-Series Switch) in a L
be via either fiber or twisted pair cabling, and may be 100Mbps or 10 Mbps speed and full-or
half-duplex mode.

The mixed-media capability is ideal for upgrading existing Ethernet LAN networks,
where existing cabling must be accommodated. The fiber-built-in media capability is ideal for
integrating future-proof fiber cabling into the LAN structure.

Example 1 : LE1401A

In a typical 10 Mb network performance upgrade, some existing cascaded 10 Mbps
hubs connect
Switch provides eight 10/100Mb traffic domains for increased performance. It can segment 10
Mbps and 100Mbps units, hubs and servers, in the existing network into multiple domains,

connect to more distant LAN centers, and a configuration with two “combo” 3@RJ-45 +
1@fiber-built-in 4PMs is used.

The LE1401A provides complete network con
nodes operate in a unified manner, functioning as one plug-and­It filters and forwards packets from one segment to another, containing the local traffic and
allowing only the packets which need to be forwarded to go outside to the appropriate other
segments. This is ideal for a central departmental switch in a high-performance LAN center.
Figure 2.4 illustrates this example.

Fig. 2.4a: AFTER

LE1401A Switch

provides central

connectivity while

maintaining full 10

Mbps and 100Mbps

bandwidth on each

segment.

100Mbps Fiber
Segment

Magnum 800E

Workgroup Hub

LINKRXLINK

PWR COL12345678

100 Mb/s

GARRETT

10 Mbps users

PWR

Black Box LE1416A

LK

Modular Switch

100/10

FDX/HDX

RX

FDX/HDX

ACT

LK

100/10

ACT

Magnum 800E

Workgroup Hub

100 Mb/s

GARRETT

100Mbps Fiber
Segment

LINKRXLINK

PWR COL12345678

100Mbps users

13

RX

Installation and User Guide (8/99)

-port LE1408A

In another application, a Switch is needed to provide a Fast Ethernet backbone. The

-speed LAN segments, each operating over 100MB full-duplex

-speed switched support for two central servers, for a 100MB

-speed hub serving a local workgroup of over a dozen users,

The LE1408A equipped with one Fiber and one RJ-45 4-port modules provides an

-mount box. No Media Converters are needed. The Fiber 4PM can be selected to

-mode or single-

This requirement for connecting local devices over twisted pair cabling is handled by

-45 4-Port Module. The 4PM provides a switched port for two local

-port dual-

Since 100Mb fiber Ethernet has severe distance limitations at half-duplex, it is

-duplex mode. Many low-end

-45 N-way 10/100Mb ports would need to have a media converter on

h fiber line. But most media converters do not support auto-negotiation and would not enable

-duplex. But the LE1408A . . . with built-in switched fiber

-duplex mode as a default setting on fiber ports, and with some

-45 N-way 10/100Mb ports as well. . . handles this application readily.

-

PWR

100/10

Magnum QS5116

LK ACT

Magnum DS8016 Stackable Hub

BR

PWR

LK/RX
PORT

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

COL 10

100

COL 100

1 2 3 4 5 6 7 8 9 10 11

X

12 13 14 15 16

UPLINK

Black0Box le1408a

1

Fiber Switch

Modular Switch

2
3
4

FDX/HDX

GARRETT

100Mb Fiber Link
segment

ACT

LK

100/10 FDX/HDX

Internet

Router

100Mb Servers

Magnum 800E

1 2 345 6 7

Workgroup Hub

LINKRXLINK

PWR COL

8

100 Mb/s

GARRETT

RX

14

Black Box Modular Switches Installation and User Guide (8/99)

segment 100Mb fiber Fast Ethernet backbone, and switched copper support for

speed hubs need switched copper

Port Switches provides the user with

more than one configuration in this case. The two ports not immediately used may be either fiber

port fiber 4PMs are selected to provide 6 required fiber ports and two for

spares and/or future backbone expansion. The 8 switched copper ports are handled with two RJ

port 100Mbps

If the probable growth of the central Switch is towards more local high speed servers

port fiber 4PM is selected to provide 4 of the required fiber ports, and two

45 + 1 fiber” 4PMs are configured for the other 2 fiber ports plus 6 of the switched

ining 2 copper ports

45 4PM could be removed and another “3+1 combo” 4PM

Example 3 : 16-port LE1416A
In another situation similar to Example 2 above, a larger central Switch is needed to

provide for a 6­4 high speed local servers. In addition, the router and two dual­ports. The total is 14 ports, 6 fiber and 8 copper.

The mixed-media flexibility of the Black-Box 4-

or copper. If the probable growth of the central Switch is towards more fiber backbone
segments, then two 4-

45 4-Port Modules configured into the LE1416A. Should the number of servers expand, more
than one server can be serviced by a switched LE1416A port by using a small 4­hub.

and users, then one 4­“combo 3 RJ­copper ports. Finally, an RJ-45 QPM is configured to provide for the rema
plus two for spares and/or future expansion. Should the need arise to add a built-in-fiber
backbone port in the future, the RJ­installed in the field. Alternatively, a 100MB Media Converter (such as the LH1500A-ST-R2)
may be used on a copper port, with internal jumpers (See Section 3.4) set to support fixed
100MB FDX on the RJ-45 port.

PWR

Magnum QS5116
Magnum QS5116

Black-Box le1416a

Fiber Switch

Modular Switch

GARRETT

100/10

LK

1
2
3
4

FDX/HDX

100/10

ACT

LK

ACT

1
2
3
4

FDX/HDX

ACT

100/10 FDX/HDX

10/100

ACTLK

100/10 FDX/HDX

10/100

ACTLK

Internet

100Mb fiber segment

100Mb Servers

Magnum DS8016 Stackable Hub

PWR BR
COL 10
COL 100

1 2 3 4 5 6 7 8 9 10 11

X

12 13 14 15 16

LK/RX
PORT

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

100

UPLINK

and Workstations

Magnum 800E

Workgroup Hub

100 Mb/s

GARRETT

100Mb Workgroup

1 2 345 6 7

LINKRX LINKRXPWR COL

Magnum DS8016 Stackable Hub

PWR BR

LK/RX
PORT

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

COL 10

100

COL 100

8

X

UPLINK

Router

1 2 3 4 5 6 7 8 9 10 11
12 13 14 15 16

10Mb Workgroup

Fig 2.4c: LE1416A provides a 100Mb mixed-media backbone Switch.

15

Installation and User Guide (8/99)

Installation

Before installing the equipment, it is necessary to take the
following precautions:

1.) If the equipment is mounted in an enclosed or multiple rack

assembly, the environmental temperature around the equipment
must be less than or equal to 500C.

2.) If the equipment is mounted in an enclosed or multiple rack

assembly, adequate air flow must be maintained for proper and
safe operation.

3.) If the equipment is mounted in an enclosed or multiple rack

system placement of the equipment must not overload or load
unevenly the rack system.

4.) If the equipment is mounted in an enclosed or multiple rack

assembly, verify the equipment’s power requirements to prevent
overloading of the building/s electrical circuits.

5.) If the equipment is mounted in an enclosed or multiple rack

assembly verify that the equipment has a reliable and
uncompromised earthing path.

This section describes installation of the LE14XXA-Series Switches, as well as

Locating LE14XXA-Series Switches

The location of a LE14XXA-Series Switch is dependent on the physical layout of the

order to communicate with each other. These Switches are

-port LE1401A

llows it to be easily placed in an office or lab area, and it can also be either shelf of wall-

Locate an AC receptacle that is within six feet (2 meters) of the intended LE14XXA-

he LE14XXA-Series will normally protect it from

left side, while the unit is in operation. See figure below.

Figure 3.1: Location of 8-port LE1401A’s cooling fan exhaust

110-220

VAC

47-63Hz

1.0-0.5A

ON

OFF

FAN EXHAUST

16

Black Box Modular Switches Installation and User Guide (8/99)

lly designed to

port Modules (4PMs) which can be individually

The various media types supported along with the corresponding IEEE 802.3 and

tips of

coded strand on the associated ports at each

to

Connect the Receive (RX) port (dark colored post on the PM) to the Transmit (TX) port

been established at both ends (and when power is ON in the unit). If LINK is not lit after

3.2 Connecting Ethernet Media

The Black-Box LE14XXA-Series Fiber Switches are specifica
support all standard Ethernet media types within a single Switch unit. This is
accomplished by using a family of 4­selected and configured per-port. See Section 2.4 for a description of the 4PMs.

802.3u standards and connector types are as follows:

IEEE Standard Media Type Max. Distance Port Module

Fiber:

100BASE-FX m m

sgl.m
small form factor m m

10BASE-FL m m

1

Fiber 2.0km (6,562 ft) LE1428C, LE1419C

2

Fiber 18.0km (95K ft) LE1421C

1

Fiber 2.0km (6,562 ft) LE1422C, LE1423C

1

Fiber 2.0km(6,562 ft) LE1424C

Copper:

10BASE-T & 100BASE-TX twisted pair 100m (328 ft) LE1425C

1

mm = multi-mode

2

sgl.m = single-mode

3.2.1 Connecting Fiber Optic ST-type, “twist-lock”
The following procedure applies to installations using a 4PM with ST-type fiber

connectors. This procedure applies to ports using a LE1428C or LE1424C.

1. Before connecting the fiber optic cable, remove the protective dust caps from the
the connectors on the 4PM. Save these dust caps for future use.

2. Wipe clean the ends of the dual connectors with a soft cloth or lint-free lens tissue

dampened in alcohol. Make certain the connectors are clean before connecting.

Note: One strand of the duplex fiber optic cable is coded using color bands at
regular intervals; you must use the color­end of the fiber optic segment.

3. Connect the Transmit (TX) port (light colored post) on the 4PM to the Receive (RX)
port of the remote device. Begin with the color-coded strand of the cable for this first TX­RX connection.

4.
of the remote device. Use the non-color coded fiber strand for this.

5. The LINK LED on the front of the 4PM will illuminate when a proper connection has

cable connection, the normal cause is improper cable polarity. Swap the fiber cables at
the 4PM connector to remedy this situation.

17

Installation and User Guide (8/99)

Connecting Fiber Optic SC-type, "Snap-In"

The following procedure applies to installations using a 4PM with SC-type fiber
connectors, i.e., using LE1419C, LE1421C single-mode.
When connecting fiber media to SC connectors, simply snap on the two square male
connectors into the SC female jacks of the 4PM until it clicks and secures.

Connecting Single-Mode Fiber Optic

When using single-mode fiber cable, be sure to use single-mode fiber port connectors.
Single-mode fiber cable has a smaller diameter than multi-mode fiber cable (9/125
microns for single-mode, 50/125 or 62.5/125 microns for multi-mode where xx/xx are
the diameters of the core and the core plus the cladding respectively). Single-mode fiber
allows full bandwidth at longer distances, and may be used to connect 10 Mb nodes up
to 10 Km apart, or 18Km with the LE1421C.

The same procedures as for multi-mode fiber applies to single-mode fiber connectors.
Follow the steps listed in Section 3.2.2 above.

Connecting Twisted Pair (RJ-45,CAT3, CAT5, Unshielded or Shielded)

The RJ-45 ports of the LE14XXA-Series can be connected to the following two media
types: 100BASE-TX and 10BASE-T. CAT 5 cables should be used when making
100BASE-TX connections. When the ports are used as 10BASE-T ports, CAT 3 may
be used. In either case, the maximum distance for unshielded twisted pair cabling is
100 meters (328 ft).

Media IEEE Standard Connector
Twisted Pair (CAT 3, 4, 5) 10BASE-T RJ-45
Twisted Pair (CAT 5) 100BASE-TX RJ-45

It is recommended that high quality CAT. 5 cables (which work for both 10 Mb and

100Mb) be used whenever possible in order to provide flexibility in a mixed-speed
network, since dual-speed ports are auto-sensing for either 10 and 100Mb/s.

The following procedure describes how to connect a 10BASE-T or 100BASE-TX
twisted pair segment to the RJ-45 port. The procedure is the same for both unshielded
and shielded twisted pair cables.

18

Black Box Modular Switches Installation and User Guide (8/99)

45 plug into

45 connector of the port. Note that, even though the connector is shielded, either

top or any suitable

Each LE1401A Switch is shipped with two metal mounting brackets (and screws) to

etal hub case using one of the metal screws for each bracket, and attached to the

supplied screw attaches the bracket to

two opposite

corners of the unit. When properly attached, the brackets will extend slightly below the base of

Media Fiber Switch in a 19” rack is a

1. Using standard twisted pair media, insert either end of the cable with an RJ­the RJ­unshielded or shielded cables and wiring may be used.

2. Connect the other end of the cable to the corresponding device

3. Use the LINK LED to ensure proper connectivity by noting that the LED will be
illuminated when the unit is powered and proper connection is established.

3.3 Table-Top or Shelf Mounting
The LE14XXA-Series Switches can be easily mounted on a table-

horizontal surface, and has four rubber feet to provide stability without scratching finished
surfaces.

3.3.1 Wall (or Vertical Surface) Mounting, 8-port LE1401A

allow the unit to be mounted in nearly any desired orientation or position. The brackets are
attached to the m
LE1401A through the round hole of the bracket. A user­the mounting surface. It is recommended that the mounting brackets be attached to

the unit to allow clearance for the rubber feet and for cooling fan exhaust space.

100 Mb/s

Black Box LE1401A

Modular Switch

GARRETT

GARRETT

Magnum LE1401A, optional

mounting brackets

Proper mounting

bracket attachment

Figure 3.1: LE1401A, metal mounting brackets

3.3.2 Rack-mounting, models LE1408A and LE1416A
Installation of a LE1408A and LE1416A Mixed-

simple procedure. The units are 1U (1.75”) high. When properly installed, the front-mounted
LED status indicators should be in
plain

PWR

Magnum QS5116

100/10

Black Box LE1416A
Magnum QS5116

1

Fiber Switch

Modular Switch

2
3
4

FDX/HDX

GARRETT

19

LK

ACT

LK

100/10 FDX/HDX

100/10

ACT

1

ACTLKACT

1

LK

2
3
4

FDX/HDX

2
3
4

FDX/HDX

ACT

Installation and User Guide (8/99)

-mount installation requires special rack-mounted brackets and

RJ-45 ports, internal jumper settings for 10/100Mb (auto-negotiation) or for

- or Full-Duplex 100Mb, per port

The factory (or default) setting is for auto-negotiation on all RJ-45 ports, which is generally

ances, but cannot always be

Jumper Settings for Auto-Negotiation, or for 100MB Half or Full Duplex

Jumper Port Function Factory Settings Speed

JP2-3,6-7, 10-11
JP1-2, 6-7, 9-10
JP1-2, 7-8, 11-12 Pin 1-2, 7-8, 11-12

Factory Settings

9 10 11 12

J1

5 6 7 8

1 2 3 4

Pin 2-3,6-7,10-11

Pin 1-2, 6-7, 9-10

10/100 Mbps

Auto Negotiation

J1

10/100 Mb

1 2 3 4

Auto-Negotiation YES
FDX @100 config
HDX@100 config

AUTO

1

100Mbps Full

J1

1 2 3

Jumper Settings for HDX/FDX
and Auto Negotiation

Duplex

100 Mb

NO

NO

100Mbps Half

J1

1 2 3

44

10/100 Mb,

100 Mb

100 Mb

Duplex

100 Mb

Bottom QPM Retaining

Two(50) Pin

QPM Connectors

(inserts into main board)

Printed Circuit card

Uplink

Switch

FRONT

TOP

J1 J2 J3

LED

J4

RJ-45 ports, internal jumper settings. Note: Be certain that the main power is

.

-negotiation will not function properly in your

-Series RJ-45 (copper) 4-

-negotiation. This is

evices presently or potentially connected, which will not

-negotiation. Examples include some NICs and most Media

20

Black Box Modular Switches Installation and User Guide (8/99)

negotiation (copper ports) is generally desirable

configuration. Under certain conditions,(where the connected device is full duplex and does not

operly)

negotiation is better and the internal jumper settings will permit this to be selected on a

Duplex, per port

duplex on all fiber 100Mbps ports, which is generally

popular. It works well under most circumstances, but cannot always be depended upon to work

Therefore, the default setting of auto-

because it is widely used and allows for the connection of various devices without re-

support Auto-negotiation; or the connected device does not support Auto-negotiation pr
no auto­per-port basis.

See Section 4.4 for additional information on auto-negotiation functionality.

3.5 Fiber ports, internal jumper settings for 100Mb fixed Half- or Full-

The factory (or default) setting is for full-

as expected. If full-duplex will not function properly in your setup, internal jumpers allow the
speed and mode of the LE14XXA-Series fiber 4-ports to be

Jumper Settings for 100Mbps Fiber Half or Full Duplex

Jumper Port

JP1-2, 6-7, 9-10

JP1-2, 7-8, 11-12

9 10 11 12

J1

5 6 7 8

1 2 3 4

Printed Circuit card

1
2

3

4

Pin 1-2, 6-7, 9-10

Pin 1-2, 7-8, 11-12

Factory Settings

Function Factory Settings Speed

FDX @100 config 100 Mb

HDX@100 config

1

100Mbps Full

J1

1 2 3

4

Duplex

100 Mb

YES

NO

100Mbps Half

1 2 3J14

Jumper Settings for HDX/FDX

J1 J2 J3

J4

Bottom QPM Retaining

Two(50) Pin

TOP

LED

QPM Connectors

(inserts into main board)

100 Mb

Duplex

100 Mb

Figure 3.5. Fiber ports, internal jumper settings. Note: Be certain that the main power is

disconnected before opening the unit or changing any internal jumper settings

21

Installation and User Guide (8/99)

-duplex. This is desirable when

-duplex. Examples include hubs which support only half-duplex by default.

Therefore, the default setting of full-duplex (fiber ports) is generally desirable because

-

ly along with switches). Under certain conditions,(where the connected

-duplex; or the connected device does not support

-duplex properly) no full-duplex is better and the internal jumper settings will permit this to

-port basis.

Combo(3+1) ports, internal jumper settings for 10/100 RJ-45 Auto-Negotiation

or 10 or 100Mb or for fixed Half- or Full-Duplex 100Mb, per port

The factory (default) setting is Auto-Negotiation on all RJ-45 ports and full-duplex on
fiber 10 Mbps or 100Mbps ports, which is generally

Jumper Settings for 10/100Mbps RJ-45 Auto-Negotiation,10 or 100Mbps RJ-45 & Fiber Half or Full Duplex

Jumper Port

JP2 -3, 6-7, 10-11 Pin 2-3, 6-7, 10-11 Auto-Negotiation YES

JP1-2, 6-7, 9-10
JP1-2, 7-8, 11-12

Factory Settings

For RJ-45 ports only

9 10 11 12

)

J1

5 6 7 8

1 2 3 4

Pin 1-2, 7-8, 11-12

10/100 Mbps

Auto Negotiation

J1

1 2 3 4

AUTO

Function

FDX @100 config 10 Mb or 100 MbPin 1-2, 6-7, 9-10

HDX@100 config

10 or100Mbps Full

10/100 Mb

J1 J2 J3

Printed Circuit card

TOP

1
2

3

4

LED

Factory Settings

YES

Duplex

100 Mb

NO

10 or100Mbps Half

J1

100 Mb

1 2 3

44

For RJ-45 &
Fiber port

1

J1

1 2 3

For RJ-45 &
Fiber port

Jumper Settings for HDX/FDX

J4

Bottom QPM Retaining

Two(50) Pin

QPM Connectors

(inserts into main board

Speed

10/100 Mb

10Mb or 100 Mb

Duplex

Be certain that the main power is

ar. Auto-Negotiation on RJ-45 and FDX on fiber port works well under most

-duplex will not

)

XXA-

22

Black Box Modular Switches Installation and User Guide (8/99)

e hubs that support only half

negotiation will not function properly in your setup, internal jumpers

negotiation. This is desirable when there are

Duplex

properly in your setup, internal jumpers allow the duplex mode of the

duplex.

Series Combo- 4ports to be fixed, even if the attached device may or may not support full­duplex. This is desirable when there are unknown devices presently or potentially connected,
which will not operate correctly with full-duplex. Examples includ
duplex by default.

If auto­allow the speed and mode of the LE14XXA-Series RJ-45 (copper) 4-ports to be fixed, even if
the attached device may or may not support auto­unknown devices presently or potentially connected, which will not operate correctly with
auto-negotiation. Examples include some NICs and most Media Converters.

3.7 Fiber 10Mb ports, internal jumper settings for 10Mb fixed Half- or Full­at all ports

The factory (default) setting is for half-duplex on all fiber 10Mbps ports,

which is generally popular. HDX works well under most circumstances. If half-duplex on
10Mbps will not function
LE14XXA-Series fiber 4- ports to be changed, even if the attached device supports full­This is desirable when there are devices connected which will not operate correctly with half­duplex. Examples include Switches that support full-duplex only.

Jumper Settings for 10Mb Fiber Half or Full Duplex

Jumper Port

JP3

JP3
JFD1
JFD1

Factory Settings

10Mbps Half­Duplex

JFD1

1 2

3

OPEN OPEN

JP2-4

JP1-3

OPEN

4

Pin 2-4

PIN 1-3 FDX@10Mb config

OPEN

JFD1

1 2

3 4

10Mbps Full­Duplex

Function Factory Settings Speed

FDX @10Mb config 10 Mb

HDX@10Mb config YES

HDX @10Mb configNOYES

JFD1

1 2

3

4

NO

1

10Mbps Full

Duplex

JF3

10 Mb

Printed Circuit card

JFD1

TOP

Jumper Settings for HDX/FDX

LED

Jumper Settings for HDX/FDX

23

10 Mb

10Mb

10Mb

10Mbps Half Duplex

JF3

Factory Settings

10 Mb

Bottom QPM Retaining

JF3

Two(50) Pin

4PM Connectors

(inserts into main board )

JF3

1

3

5 6

7 8

2

4

Installation and User Guide (8/99)

Figure 3.7 10Mbps Fiber ports internal jumper settings.

Be certain that the main power is disconnected before opening the unit or changing any

re, the default setting of half-duplex ( fiber ports) is generally desirable because it is

-configuration.(where the

-duplex i.e., Hub and media-converters.)

For 10Mbps fiber ports, the user can set the jumpers either at full-duplex or half duplex on

Powering the LE14XXA-Series Switch

The Black-Box LE14XXA-Series Switches incorporate an internal universal power

-rear. A manual

-OFF switch is adjacent. A six-foot 115 VAC 60 Hz standard power cord is supplied

Figure 3.5: LE14XXA-Series

110-220

47-63Hz

1.0-0.5A

ON

VAC

OFF

AC power connector

The auto-ranging power supply supports installation environments where the AC

When connecting the Ethernet cabling, there is no need to power down the unit.

Power supply options are available to suit the LE14XXA-Series Switches to special

-availability communications and/or heavy industrial-grade applications, including:

-48VDC with single DC input,

-48VDC with dual-source DC input,

-48VDC with dual redundant internal power supply units and dual-source DC input,

AC with dual redundant internal power supply units and dual-source AC input

24

-

-port units will

-related

Black Box Modular Switches Installation and User Guide (8/99)
See the Appendices of this manual for more details. Use an RFQ for other variations.

25

Installation and User Guide (8/99)

4 Port Module (4PM) Installation

The LE14XXA-Series Modular Switches are normally received from the factory with

llowing procedure describes this operation.

Preparation for Installing and Removing 4PMs

STOP!!!

Be sure the power cord is unplugged

from the chassis before attempting to remove

and/or replace any 4PM cards.

Failure to do so may result in damage to the unit

and will void the warranty.

- Avoid Static Discharge: The port modules (like most electronic equipment)
are sensitive to static discharge. Use proper ESD measures when handling port
modules.

Make sure the 4PM Card package has all necessary accessories to install it properly.

The 4PM Card package for field installation comes along with a 4PM Card, two 7/16
stand-offs , two #4-40 Pan-Head screws, two #4-40 black color Flat-head screws and
two Headers pin.

-

Remove Chassis Cover

The LE14XXA-Series chassis are combined with top and bottom part and assembled

and three screws each on the left and right edges. Remove these screws. Once these are

20 Phillips Head Screws on Top

Removing

PWR

Magnum QS5116

Fiber Switch

GARRETT

Power Input

TopChassis Cover

Caution: Be careful not to disturb the power supply.

26

-top of the

Black Box Modular Switches Installation and User Guide (8/99)

ots located on the front of the LE1416Amodel, whereas LE1401A and LE1408A has two 4PM

front of the unit, there are two retaining screws for each 4PM card slot

as well as two other retaining screws on the rear top of the module. These four screws are used

ews are also used to secure the individual 4PM

cards, which can be subjected to significant forces from the attached cables. (See Figure 3.9.1c)

Looking down into the LE14XXA-Series unit, notice that there are individual 4PM
connector sockets along with two stand-offs for each 4PM card position. There are four 4PM
sl
slots in the front. (See Figure 3.9.1b).

AC Power Input

Back of Unit

Cooling Fan

Left
Side

LED Status Slot

Power Supply Board

Media Connector

Eight QPM Slots

with electronic
elements

Front of Unit

Right
Side

Figure 3.9.1b: LE1416A, Top View with Chassis Cover

Step 3. Remove bottom-front and modules rear top Retaining Screws in any 4PM or

Face Plates

On the bottom-

to secure a 4PM face plate in position. These scr

Two retaining screws on the rear top of
module

Magnum QS5116

Fiber Switch

GARRETT

Two Bottom retaining Screws for each QPM card

4PM CARDS

Magnum QS5116

Fiber Switch

GARRETT

1

TOP

J1 J2 J3
J4Printed Circuit card

Figure 3.9.1c: Front View - 4PM Retaining

Screws hold Face Plates

27

Installation and User Guide (8/99)

Installing 4PM Cards in the LE14XXA-Series

Up to four front-mounted 4PM cards may be installed in one LE1416A Fiber Hub
unit. Follow these steps to install a 4PM.

Remove top chassis cover. See procedure in Section 3.9.1 above.
Screw down tightly the two 7/16 stand-offs on the top of pre installed stand-offs from

the factory.

Align the two headers pin on the top of the two sets of socket fixed at the bottom side

of the 4PM module. (Note: After firmly attached the sockets and the header pin, move
the mounted pins slightly tilted towards the front of the chassis.

The figure here illustrates the
basic layout of an individual 4PM
card. Each 4PM card fits into the
selected 4PM connector socket
slot. Align the connector pins on

Uplink
Switch

Printed Circuit card

TOP

FRONT

Jumper Settings for HDX/FDX
and Auto Negotiation

J1 J2 J3 J4

LED

Two Set of Ten(10) Pin

4PM Connector

(inserts into main board )

the bottom of the 4PM card with
the connector socket inside the unit.

Be sure the 4PM front panel is guided into the front slot cut-out first and then

precisely aligned the header pins with the holes in the socket slot mounted on the
board. Slowly and carefully apply enough pressure on both rear corner of 4PM
Module to insert the 4PM card’s pins into position. A click sound will determine the
proper lockup of the two, see Figure 3.9.2b. (If you force the 4PM down when the
pins are not properly aligned with the holes in the header, the pins will become bent
and the 4PM is damaged).

Once inserted, the 4PM card will be secured by the header connector, the front panel

port slot cut-out, and retaining screws. Use #4-40 Pan Head retaining screws to secure
the module rear part and #4-40 Flat Head (Black color) retaining screws for front panel.

NOTE: If a 4PM is difficult to install, try it in another port slot. Some of the port
modules may fit easily in one port slot and be very hard to install in another.

28

Black Box Modular Switches Installation and User Guide (8/99)

Figure 3.9.2a:

Inserting

4PM Cards

Series unit to be

cover the slot opening in the front panel. This will maintain proper cooling air flow,

4PM

To properly remove a 4PM card from the Fiber Switch, follow the 3 steps below.

4PM CARDS

Magnum QS5116

Fiber Switch

GARRETT

1

TOP

J1 J2 J3
J4Printed Circuit card

into a

LE1416A

NOTE: All 4PM slots need not be filled in order for the LE14XXA-

operational. When leaving 4PM slots empty, always use a face plate ( 4PM-FP) to

safety, and operation as required by FCC, CE, and other regulations.

Step 7. The figure below shows the top view of 4PM Card after successfully installed the

cards inside the LE1416A.

AC Power Input

Back of Unit

Cooling Fan

Left
Side

Power Supply Board

Media Connector

Four QPM Slots

with electronic
elements

Front of Unit

Right
Side

Fig. 3.9.2b Top View : 4PM Module Installed inside a LE1416A

Step 8. Once all 4PM cards have been installed (including face plates for empty slots), the

chassis cover should be replaced.

3.9.3 Removing 4PM Cards

Step 1. Remove chassis cover See procedure in Section 3.9.1 above.

Caution: Be sure the power cord is unplugged.

Step 2. Remove bottom-front retaining screws for the 4PM and Face Plate

29

Installation and User Guide (8/99)

On the bottom-front of the unit there
are two retaining screws for each 4PM card and face plate slot. These screws are used
to secure a 4PM card in position (see Figure 3.9.3a). Remove the front screws first
and then screw mounted on the rear-top of the 4PM to be removed.

Two retaining screws on the rear top of
module

Magnum QS5116

Fiber Switch

GARRETT

Two Bottom retaining Screws for each QPM card

4PM CARDS

Magnum QS5116

Fiber Switch

GARRETT

1

J1 J2 J3

Printed Circuit card

J4

TOP

Figure 3.9.3a: Front View - Face Plate & 4PM Retaining Screws

Remove 4PM Card

Gently pull the 4PM card up and out of the connector socket (see Figure 3.9.3b).

J1 J2 J3

4PM CARDS

Printed Circuit card

J4

TOP

Magnum QS5116

Fiber Switch

1

GARRETT

Figure 3.9.3b: Removing a 4PM Card

If the slot from which the 4PM card has been removed is to remain unused, be sure to
install a 4PM face plate cover in it. If another 4PM card is replacing the one that has
been removed, follow the steps as described for installing a 4PM card discussed in
Section 3.9.1.

30

Black Box Modular Switches Installation and User Guide (8/99)

speed among all

devices. There is no software configuring to

port. Half / Full duplex mode and 10 or 100Mbps selection for

be done through jumper settings inside the unit. The internal functions of

Each time a packet arrives on one of the switched ports, the decision is taken to either

ts whose source and destination addresses are on the same

port segment will be filtered, constraining them to one port and relieving the rest of the network

ed to the appropriate port, and will not be sent to the other ports where it is not needed.

which eliminates bad packets and enables peak performance to be achieved when there is heavy

esses

4.0 OPERATION
This chapter describes the functions and operation of the LE14XXA-Series.

4.1 Switching Functionality

A LE14XXA-Series provides switched connectivity at Ethernet wire-

of its ports. The LE14XXA-Series supports10/100Mbs for copper media and 10 or 100Mb
separate traffic domain for fiber port to maximize bandwidth utilization and network
performance. All ports can communicate to all other ports in a LE14XXA-Series, but local
traffic on a port will not consume any of the bandwidth on any other port.

LE14XXA-Series units are plug-and-play

be done at installation or for maintenance. The only hardware configuration settings are user
options for UP-LINK on RJ-45 4­the switched ports can
both are described below.

Filtering and Forwarding

filter or to forward the packet. Packe

from processing them. A packet whose destination address is on another port segment will be
forward
Traffic needed for maintaining the operation of the network (such as occasional multi-cast
packets) are forwarded to all ports.

The LE14XXA-Series Switches operate in the store-and-forward switching mode,

traffic on the network.

Address Learning

All 16-port LE14XXA-Series units have address table capacity of 24K node addr

(12K for 8-port models), suitable for use in large networks. They are self-learning, so that as

31

Installation and User Guide (8/99)

-Port Switch

An address-aging algorithm causes least-used addresses to fall out in favor of new

-used addresses. To reset the address buffer, cycle power down-and-up.

Status LEDs

For all LE14XXA-Series models :
PWR : Power LED, ON when AC power is applied to the unit.

LK : Steady ON, Link status for 10 Mbps and 100Mbps operation.
ACT : ON with port activity for 10 Mbps and 100Mbps operation.
F/H : Full / Half duplex LED, ON when the port is running full duplex, OFF

for half duplex.

100/10 : Speed LED, ON when the speed is 100Mbps , OFF when the speed is

10 Mbps

Up-link push-button, for RJ-45 4-port only

1 2 3 4

LK

ACT

Figure 4.3 : Up-link push-

-45 4-port

x

100/10 FDX/HDX

The unit has a manual Up-link

-button, located on the front panel next to 10/100Mb RJ-45 4-port # 1 which it controls. It

tching hub in the network. Verify proper Up-link push-

Auto-negotiation, for Fast Ethernet copper ports

The LE14XXA-Series Fast Ethernet copper ports can be set for either fixed 100Mb

-way auto-negotiation per the IEEE802.3u standard. The selection is

-setting instructions). The factory default

-negotiation. At 100Mb-fixed speed, the user may select half- or full-duplex

-45 port separately.

32

Black Box Modular Switches Installation and User Guide (8/99)

Switch copper ports is to connect one

other remote 100Mb device. In this case, it is desirable to operate the fiber link at 100Mb speed,

45 ports handle this situation by changing the internal jumper

negotiation and connected to

are 4 different speed and F/H modes selection depending

duplex, (3)

nding order and will normally arrive at

controlled process, the original “highest order mode” result can change

network changes that may occur). If the device at the other end is not

standard.

One frequently-used application for the 4-Port-

of them using a fiber media converter to another Switch in the network backbone, or to some

and at either half- or full duplex mode depending on the capabilities of the remote device.
Standard commercially-available Fast Ethernet media converters mostly do not support auto­negotiation properly, and require that the switched port to which they are connected be at
100Mb fixed speed. Attachment to 10/100 auto-negotiation ports typically will not work
properly. The 4-Port-Switch’s RJ­settings. (see Section 3.4)

When 4Port-Switch’s RJ-45 copper ports are set for auto-

an another auto-negotiating device, there
on what the other device supports. These are: (1) 100Mb full-duplex, (2) 100Mb half­10 Mb full-duplex and (4) 10 Mb half-duplex.

The auto-negotiation logic will attempt to operate in desce
the highest order mode that both devices can support at that time. (Since auto-negotiation is
potentially an externally­at any time depending on
an auto-negotiating device, the 4Port-Switch’s RJ-45 ports will try to detect its idle signal to
determine 10 or 100 speed, and will default to half-duplex at that speed per the IEEE

General information -

Auto-negotiation per-port for 802.3u-compliant switches occurs when:

the devices at both ends of the cable are capable of operation at either 10 Mb or
100Mb speed and/or in full- or half-duplex mode, and can send/receive auto­negotiation pulses, and . . .

-- when the second of the two connected devices is powered up*, i.e., when
LINK is established for a port, or

-- when LINK is re-established on a port after being lost temporarily.

33

Installation and User Guide (8/99)

• NOTE – some NIC cards only auto-negotiate when the computer system that they

are in is powered up. These are exceptions to the “negotiate at LINK – enabled” rule
above, but may be occasionally encountered.

When operating in 100Mb half-duplex mode, cable distances and hop-counts may be

-times must account for all

-Series Fast Ethernet

-duplex, the bit time delay is 50BT.

Auto-negotiation for 10 Mb ports, half- or full-duplex mode

Full-duplex Ethernet provides separate Transmit and Receive data paths, enabling

-directional collision-free data movements on a port. The network topology must

-duplex mode, the cable distance is only limited by

-domain restrictions or

The LE14XXA-Series Switches perform half- or full-duplex mode auto-negotiation

-negotiation or is set to operate as full-duplex, the 4-Port Switch

-duplex. If the attached device or node doesn’t support F/H mode auto-

-Port-Switch’s

-45 ports will default to operate at half-duplex.

Flow-control, IEEE 802.3x standard

Black-Box LE14XXA- Series Switches incorporate a flow-control mechanism for Full-

-control is to reduce the risk of data loss if a long burst of
ames until its buffer memory is full. This is most likely to

to one 100Mb port, and in other protracted heavy traffic situations.

LE14XXA-Series Fiber Switches implement the 802.3x flow control (non-blocking) on

-Duplex ports, which provides for a “PAUSE” packet to be transmitted to the sender when
buffer is nearly filled and there is danger of lost packets. The transmitting device is

-switch port for sufficient time to let the Switch

34

Black Box Modular Switches Installation and User Guide (8/99)

, the Switch will send

transmitting device must also support the 802.3x flow control standard in order to communicate

ers necessary to compute

The following data has been collected from component manufacturer’s (HP’s and Siemens’) web

Speed,

X’mitr

R’cvr

Worst*

Km, fdx

9.5

reduce the buffer space used. When the available free-buffer queue increases
a “RESUME" packet to indicate the transmitter to start sending the packets. Of course, the

properly during normal operation.

Note: When in Half-Duplex mode, the Modular -switch implements a back-

pressure algorithm on 10/100 Mb ports for flow control. That is, the switch prevents
frames from entering the device by forcing a collision indication on the half-duplex
ports that are receiving. This temporary “collision” delay allows the available buffer
space to improve, as the switch catches up with the traffic flow.

4.7 Power Budget Calculations for LE14XXA-Series 4PM’s with Fiber Media
Receiver Sensitivity and Transmitter Power are the paramet

the power budget. To calculate the power budget of different fiber media installations using
LE14XXA models, the following equations should be used:
OPB (Optical Power Budget) = PT(min) - PR(min)
where PT = Transmitter Output Power, and PR = Receiver Sensitivity

Worst case OPB = OPB - 1dB(for LED aging) - 1dB(for insertion loss)
Worst case distance = {Worst case OPB, in dB} / [Cable Loss, in dB/Km]
where the “Cable Loss” for 62.5/125 and 50/125µm (M.m) is 2.8 dB/km,
and the “Cable Loss” for 100/140 (Multi-mode) is 3.3 dB/km,
and the “Cable Loss” for 9/125 (Single-mode) is 0.5 dB/km

sites and catalogs to provide guidance to network designers and installers.

Fiber

Port

Module

LE1424C 10 Mb

LE1428C 100Mb

LE1421C

LE1422C

Std.

FL

FX

100Mb

FX

100Mb

FX

Mode

Multi-

mode

Multi-

mode

Single-

mode

Multi-

mode

Std.

Wave
km
fdx

(hdx)

2

(2)

2

(0.4)

18+

(0.4)

2

(0.4)

Cable

-

Size

µm

62.5/12
5

100/14

0

50/125

62.5/12
5

50/125

62.5/12
5

50/125

Outpu

t

P

dB

T ,

-15.0

-9.5

-19.5

-20

-23.5

-20

-23.5

lengt

h

nm

850

1300

1300 9/125 -15 -31 14 28 17.5 35

1300

Sens.

P

R

dB

,

-31

-31

-31

-31

-31

-31

-31

Wors

t

OPB,

dB

14

19.5

9.0

5.5

9.0

5.5

distanc

e Km,

fdx

5

5.9

3.4

2.5

2.0

3.0

2.0

typica

l

OPB,

dB

17

23.5

13.5

14
12 5 4

15.8

12.2

typical*

distanc

35

e

6
7

4.8

5.5

4.0

Installation and User Guide (8/99)

100Mb

FX

Multi-

mode

2

1300 62.5/125 -14 -31 15 5

(0.4)

16 5.7

e: The use of either multi-mode or single-mode fiber to operate at 100Mbps speed over

long distances (i.e., in excess of approx. 400 meters) can be achieved only if the
following factors are both applied:

• The 100Mb fiber segment must operate in full-duplex (FDX) mode, i.e. the full-duplex

(factory default) setting for 100Mbps fiber ports must be used, and

• The worst-case OPB of the fiber link must be greater than the fiber cable’s passive

Attenuation.

(Attenuation = Cable loss + LED aging loss + Insertion loss + safety factor)

Introduction - LE14XXA-Series 4-Port Modules(4PM)

This chapter describes each 4-Port Module (4PM), including appearance,
functionality, and status displays.

Inspecting the Package and Product

This section applies only to 4PMs shipped as separate items, i.e., 4PMs not factory
installed in a LE14XXA-Series 4PM slot.

Examine the shipping container for obvious damage prior to installing a 4PM; notify
the carrier of any damage which you believe occurred during shipment or delivery.
Inspect the contents of this package for any signs of damage and ensure that the items
listed below are included.

This package should contain:

Installation instructions, with illustrations

Remove the 4PM(s) from the shipping container. Be sure to keep the shipping container
should you need to ship any of the 4PMs separately at a later date.

In the event there are items missing or damaged contact your supplier. If you need to
return the unit, use the original shipping container if possible. Refer to Chapter 5 for
specific return procedures.

Product Description

One or more 4PMs.

36

Black Box Modular Switches Installation and User Guide (8/99)

port,

the front port slots are designed to support all standard Ethernet media types at 10 or

the FDX/HDX LED indicates

-

duplex when off). Lettering on the

An important feature of the LE14XXA-Series is the use of 4-Port Modules (4PMs)
and for flexible mixed-media connectivity to RJ-45 and fiber media use of Combo 4­port module. Since the LE14XXA-Series have dual-speed capability for copper-

100Mps speed. Each 4PM provides one port for connecting one Ethernet segment
with its individual connector type and media.

For a list and brief illustration of 4-Port Module types, refer to Section 2.4
Each 4PM is individually described in the following sections.

5.2.1 LE1428C, 100Mb multi-mode FX-ST-4-port Module, “twist lock” connector

The LE1428C is a multi-mode 100Mbps fiber optic 4-port
module equipped with a dual ST-type

connector. It functions as a fiber optics
transceiver to support 100BASE-FX
network segments. When installed in a
LE14XXA-Series Fiber Switches, it

100BASE-FX, and 10BASE-FL

ST Connectors

3

FDX/HDX

LK

1

2
3
4

2

1 2 3 4

1

ACT

supports fiber optic cable distances up the
IEEE-sp ecified 100Mbps shared-collision­domain distance limits, i.e., typically 2km at
full-duplex and 412m at half-duplex.

ACTIVITY

3

2

LINK

FULL/HALF
DUPLEX MODE

1

The module is equipped with an Activity (ACT) LED, a Link (LK) LED which
indicates proper connectivity with the remote device when lit, and
the full or half-duplex mode. Lettering on the front of the module identifies it as “100 FX” to
avoid confusion with other similar-looking 10 Mb fiber 4PMs.

5.2.1a LE1424C, 10 Mbps multi-mode FL-ST-4-port type, “twist-lock” connector

The LE1424C is a multi-mode 10 Mbps fiber optic module equipped with a dual ST
type connector. It looks similar to the 100Mb LE1428C, but has the lettering “10 Mb” on the
front to distinguish it. It supports fiber optic cable distances up the IEEE -standard 10 Mb
distance limits , i.e., typically 2km at full-duplex and at half-duplex.

Each port has an Activity (ACT) LED indicating packets being received, a
Link (LK) LED that indicates proper connectivity with the remote device when lit, and a
FDX/HDX LED to indicate full-duplex mode when lit (or half-

37

Installation and User Guide (8/99)

-looking 100Mb

LE1419C 100Mbps multi-mode FX-SC-4-port type, “snap-in” connector

The LE1419C is also a multi-mode 100Mbps

.HDX operational, and the same

-plate lettering.
While the functionality of the these two

100BASE-FX Multi-Mode

SC Connectors

3

FDX/HDX

1

2

3

4

1

ACT

LK

4

2

1 2 3 4

ACTIVITY

FULL/HALF

3

DUPLEX MODE

-type "snap-in" connector instead of an ST-type.

2

1

ACT

LINK

LE1421C 100Mbps single-mode FX-SC-type, “snap-in” connector

The LE1421C is a single-mode 100Mbps fiber optic module equipped with a dual SC-

le-mode fiber network segments.

100BASE-FX Single-Mode

TheLE1421C, when installed in a

-Series Modular Switch operating at

-duplex, supports single-mode fiber

3

FDX/HDX

Each port is equipped with an Activity

1

-

-mode LE1419C, the label “Sgl. M.” is at the top of the faceplate

38

-Switches, supporting

SC Connectors

2

1 2 3 4

LK

1

ACT

2
3
4

ACTIVITY

FULL/HALF

3

DUPLEX MODE

2

1

ACT

LINK

Black Box Modular Switches Installation and User Guide (8/99)

factor

DUPLEX MODE at the port. It has the same “100Mb FX” lettering on the faceplate. Note that

RJ type.

5.2.4 LE1422C, 100Mb multi-mode FX 4-Port, MTRJ small-form-factor connector

LE1422C is a multi-mode fiber optic 4-port module equipped with a small-form­MTRJ-type connector. It looks almost like
an RJ-45 port, but it is black in color. The
MT-RJ’s small size and ease of connection
make it a good choice for 100Mbps “fiber-

100BASE-FX MTRJ

Connectors

3

FDX/HDX

1
2
3
4

2

1 2 3 4

LK

1

ACT

to-the-desktop” Ethernet connectivity.
When installed in a LE14XXA-Series full­duplex Switch, it supports fiber optic cable
distances up the IEE-standard 100Mbps
shared-collision-domain distance limits, i.e.,

ACTIVITY

1

3 FULL/HALF

DUPLEX MODE

“small-form-factor”

2

LINK

typically 2 km at full-duplex and 412m at
half-duplex.

The functionality of this 100BASE-FX multi-mode 4PM is same as the ST and SC­types, and it is equipped with the same ACTIVITY (ACT), LINK (LK) LEDs to indicate
proper connectivity with the remote device and (FDX/HDX) indicate the FULL OR HALF

the other end of the fiber cable may have a different connector, not necessarily an MT-

5.2.5 LE1423C, 100Mbps multi-mode FX 4-Port, VF-45 small-form-factor connector

39

Installation and User Guide (8/99)

LE1423C is a 4-port multi-mode fiber FX “small-form-factor” VF-45 connector used

-to-the-desktop links. Its size is similar to the MT-RJ port, but the

-45 shell is slightly larger. When not in use, its appearance is distinctive because it has a tiny

When installed in a LE14XXA-Series

100BASE-FX MV45

Connectors

-duplex, it supports fiber

-duplex.

-standard 100Mbps

-duplex and

3

FDX/HDX

1
2
3
4

2

LK

ACT

1

The small size, about the same as an RJ-45,

ge of “future-proof” fiber

ACTIVITY

1

FULL/HALF

3

DUPLEX MODE

“small-form-factor”

2

The cable port is a “plug-in” connector, with

remote device, an

-duplex mode when lit (or half-duplex when off).

LE1425C (Twisted Pair), 10/100Mb TP 4-Port

The LE1425C module supports Ethernet twisted pair segments of any standard length.

-port RJ-45 connector with 10/100 and auto-negotiating capability on each

-45 connector is shielded to minimize emissions and will allow both unshielded

d pair (UTP) and shielded twisted pair (STP) cable connections.

The LE1425C 4-port module is equipped with a Media Dependent Interface-

-X) push-button to allow for one cascaded connections. This feature eliminates

10/100BASE-T,4Port

RJ-45 Connectors

With the push-button in the IN (X)

-TP port is used for

-link connections (i.e.: a

Cross-Over
Push Switch

40

x

1

ACTIVITY

LK

2

1 2 3 4

100/10 FDX/HDX

4

2

LINK

FULL/HALF

ACT

LINK

1

3

Black Box Modular Switches Installation and User Guide (8/99)

hub or switch typically.) When used for segments going to workstations

T unshielded twisted pair wiring (UTP)

wiring (STP) of 150m (500 ft.). Each port has an Activity (ACT) LED indicating packets being

when lit, a

duplex when off), and a “speed”

,

45 port

links using twisted pair wiring, i.e., the transmit and the receive

, other pins not

-

connection to another
and other user node device connections, the MDI-X push-button should be in the OUT (=)
position.

The LE1425C will support 10BASE-

environments with maximum segment distances up to 100m (325 ft.), or shielded twisted pair

received, a Link (LK) LED that indicates proper connectivity with the remote device
FDX/HDX LED to indicate full-duplex mode when lit (or half­LED indicating 100Mb when lit (or 10 Mbps when off).

Important Note: For the LE1425C Crossover Push-button ­ OUT for workstations and user connections.
IN for Up-Link connections to other hubs, etc.

The RJ-45 pins normally (TP crossover push-button DOWN) are per the standard for
hubs-to-users twisted pair wiring: 1 = receive+, 2 = receive-, 3 = transmit+, 6 = transmit­other pins not used. When the TP crossover push-button is UP, the pins of the RJ­are per the standard for up­pairs are exchanged: 1 = transmit+, 2 = transmit-, 3 = receive+, 6 = receive­used.

5.2.7 LE1426C, “3TP + 1F” 3 10/100Mb RJ-45 and 1 100Mb Fiber SC (multi-mode)
Connector Combo 4-Port

The LE1426C Combo 4-port
supports three auto-negotiating twisted pair
ports at 10/100Mbps FDX/HDX, and one
fiber port with 100Mbps multi-mode FX SC
connector. The three RJ-45 ports on the right
operate the same as those in the same place

10/100BASE-T and 100BASE-FX Combo

Quad-Port Connectors

2

1 2 3 4

5

LK

HDX/FDX

100/10 FDX/HDX

1

ACTIVITY

FULL/HALF

3

DUPLEX (RJ-45)

5

FULL/HALF DUPLEX(FIBER)

ACT

4

2

LINK

4

1

3

SPEED

on the QPM-RJ45 module.

The fiber SC connector functions as a fiber optics transceiver to support 100BASE­FX network segments. When installed in a LE14XXA-Series Fiber Switches, it supports fiber
optic cable distances up the IEEE-standard 100Mbps distance limits, i.e., typically 2km at full
duplex and 412m at half-duplex. The factory default setting is for full-duplex operation, and a
jumper on the module must be moved to select half-duplex. (See Section 3.4).

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Installation and User Guide (8/99)

Each 3+1 combo 4-port has an Activity (ACT) LED indicating packets being received,

-duplex mode when lit (or half-duplex when off). In addition, the

-45 ports have a “speed” LED indicating 100Mb when lit (or 10 Mbps when off). The fiber

LE1427C, “3TP + 1F” 3 10/100Mb RJ-45 and 1 100Mb Fiber ST (multi-mode)

Connector Combo 4-Port

-port, supports three auto-negotiating twisted pair ports at

-mode similar to the FX SC connector. It

00) Speed, FDX/HDX

-mode 100Mbps fiber optic transceiver module, similar

LE1429C, “3 + 1” 3 10/100Mb RJ-45 and 1 100Mb Fiber SC Single-mode

Connector, “Combo” 4-Port Module

The LE1428C is also a 3+1 Combo 4-port module. It is the same as the LE1426C

-mode. See Section 5.2.3 for a description of

-mode fiber port.

4PM-FP

The 4PM-FP is a blank face plate that must be installed in empty 4PM slot. When the

-FP face plate in order

Fig.5.2.10 Blank Face Plate

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Black Box Modular Switches Installation and User Guide (8/99)

If you have difficulty installing or operating the LE14XXA Modular Switches, refer to

nnected

and the cables/wires have not been crimped or in some way impaired during installation.

Check that the AC power cord is plugged into a functioning electrical outlet. Make sure

Use the PWR

6.0 TROUBLESHOOTING

If problems should develop during installation or operation, follow the suggestions
below prior to calling Technical Support for help. If you are unsure of any procedure
described in this chapter, or if the LE14XXA is not operating as expected, do not
attempt to repair or alter the unit. Contact Black Box for assistance.

6.1 Before Calling for Assistance

1.

Chapters 3 and 4. Make sure that the various other components of the network are
working.

2. Check the cables and connectors to make sure that they have been properly co

3.
that the AC power cord is properly plugged into the Modular Switches.
LED to verify that the unit is receiving proper power.

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Installation and User Guide (8/99)

4. If the problem is isolated to a network device other than the LE14XXA -Series Modular
Switch, replace the problem device with a known good device. Verify whether or not
the problem is corrected. If it is not, go to step 5. If the problem is corrected, the
Modular Switches and its associated cables will function properly.

5. If the problem still exists, contact Black Box.

When Calling for Assistance

If you determine that your LE14XXA-Series Modular Switch is malfunctioning, do
not attempt to alter or repair the unit. It contains no user-serviceable parts. Contact Black
Box at [phone].

Before you do, make a record of the history of the problem. Black Box will be able
to provide more efficient and accurate assistance if you have a complete description,
including:

• the nature and duration of the problem.

• when the problem occurs.

• the components involved in the problem.

• any particular application that, when used, appears to create the problem or

make it worse.

Shipping and Packaging Information

If you need to transport or ship your LE14XXA -Series Modular Switch:

• Package it carefully. We recommend that you use the original container.

• If you are shipping the LE14XXA -Series Modular Switch for repair, make sure you

include everything that was in the original package. Before you ship, contact Black
Box to get a Return Materials Authorization (RMA) number.

Ship the package to:

Black Box Corporation
1000 Park Drive
Lawrence, PA 15055
Phone: [phone]
Fax: [phone]

44

Black Box Modular Switches Installation and User Guide (8/99)

Black Box Corporation

The World’s Source for Connectivity

 Copyright 1999. Black Box Corporation. All rights reserved.

1000 Park Drive · Lawrence, PA 15055 · [phone] · Fax [phone]

45