GarrettCom Magnum 4K220 Installation And User Manual

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Magnum 4K-Series

4K Switches

Installation and User Guide

= X

UPLINK

2 4 6 8 10 12 14 16 18 20 22 24 2 6 2 8 3 0 3 2 3 4 3 6 3 8 4 0

1 3 5 7 9 11 13 15 17 19 21 23 25 2 7 2 9 3 1 3 3 3 5 3 7 3 9

115-230V~ 50/60 Hz

(-) GND (+)

48V DC

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UPLINK

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1 3 5 7 9 11 13 15 17 19 21 23 25 27 2 9 3 1 3 3 3 5 3 7 3 9

Power

Col/FDX

Col/FDX

Magnum 4K220R-Series

Ethernet 10/100 Switch

100M
Col/FDX
Link/Act

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

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Magnum



4K-Series

4K220 Switches

Installation and User Guide

Part #: 84-000094 (Rev D)

Trademarks
Ethernet is a trademark of Xerox Corporation
NEBS is a trademark of Telcordia Technologies
UL is a registered trademark of Underwriters Laboratories
GarrettCom, Magnum and Personal Switch are trademarks and Personal Hub is

a registered trademark of GarrettCom, Inc.

Important: The Magnum 4K220 Switches contains no user serviceable
parts. Attempted service by unauthorized personnel shall render all
warranties null and void. If problems are experienced with the Magnum
4K Switches, consult Section 6, Troubleshooting, of this User Guide.

Copyright  2004 GarrettCom, Inc. All rights reserved. No part
of this publication may be reproduced without prior written permission from
GarrettCom, Inc.

Printed in the United States of America.

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Contacting GarrettCom, Inc

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

GarrettCom, Inc.

47823 Westinghouse Drive

Fremont, CA 94539

Phone [phone]

Fax [phone]

Website: http://www.GarrettCom.com

email [e-mail]

Federal Communications Commission

Radio Frequency Interference Statement

This equipment generates, uses and can radiate 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 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.

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TABLE OF CONTENTS Page

1.0

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

1.1

T

ECHNICAL SPECIFICATIONS

.................................................................1

2.0

INTRODUCTION..................................................................................3

2.1

I

NSPECTING THE PACKAGE AND PRODUCT

............................................3

2.2

P

RODUCT DESCRIPTION - MAGNUM

4K220CR S

WITCHES

....................4

2.2.1

Magnum 4K220 Switch chassis...................................................4

2.2.2: Magnum 4K220CR “Reverse” model,.........................................5

2.2.3

Up-link port #39 for Cascading....................................................6

2.2.4

4K220C, 10/100 F/H dual-speed switched ports,.........................6

2.2.5

Frame Buffering and Latency.......................................................6

2.3

F

EATURES AND BENEFITS

......................................................................9

2.4

A

PPLICATIONS

.....................................................................................10

3.0

INSTALLATION................................................................................11

3.1

L

OCATING MAGNUM

4K220 S

WITCHES

..............................................11

3.2

C

ONNECTING ETHERNET MEDIA

.........................................................12

3.2.1

Connecting Twisted Pair ............................................................12

3.3

P

OWERING THE MAGNUM

4K220CR S

WITCH

.....................................12

3.4

RACK-MOUNTING

..................................................................................13

4.0

OPERATION........................................................................................14

4.1

S

WITCHING FUNCTIONALITY

...............................................................14

4.2

S

TATUS

LEDS.....................................................................................15

4.3

UP-

LINK PORT, FOR

RJ-45 P

ORT

#39 (

ONLY

) ......................................15

4.4

A

UTO-NEGOTIATION FOR

RJ-45 (

COPPER) PORTS

................................15

4.5

A

UTO-NEGOTIATION, FULL-DUPLEX MODE

..........................................16

4.6

F

LOW-CONTROL,

IEEE 802.3

X STANDARD

..........................................17

5.0

TROUBLESHOOTING.......................................................................17

5.1

B

EFORE CALLING FOR ASSISTANCE

....................................................18

5.2

W

HEN CALLING FOR ASSISTANCE

.......................................................18

5.3

R

ETURN MATERIAL AUTHORIZATION

(RMA) P

ROCEDURE

.................19

5.4

S

HIPPING AND PACKAGING INFORMATION

..........................................20

APPENDIX A: WARRANTY INFORMATION .........................................20

APPENDIX B : INTERNAL DC POWER SUPPLY OPTION...................21

APPENDIX C: INTERNAL DC DUAL-SOURCE POWER OPTION......24

R

EVISIONS

Rev D 10/04: edited minor update
Rev D 04/02: Updated Rack-mounting and Appendix B & C with 24VDC
and 125VDC Power Supply option
Rev C 05/01: Modify for 4K220CR specifications
REV B 04/01 : Change the company name to GarrettCom, Inc. (Formerly

it was Garrett Communications). There are no changes to the content of
the material at this time.
Rev A 03/00 : This revision is the initial release of the 4K Switch user
manual.

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The Magnum Line

ETHERNET CONNECTIVITY PRODUCTS

"DESIGNED AND MANUFACTURED IN THE USA"

OVERVIEW

GarrettCom, Inc. offers the premium-quality Magnum line of Ethernet LAN
connectivity products with industry-standard functionality and built-in fiber
configurability. Magnum products are designed for use in demanding Carrier Class,
Industrial Grade and OEM applications where reliability is a primary consideration.

4K-Series Switches, 100 & 10Mbps, copper ports with optional fiber

port, with auto-negotiating full switching performance

Quad-Series Fiber Switches, 100 & 10Mbps, fiber and copper
ports, mixed-speed and mixed-media types, full switching
performance
“Outdoor” Ethernet Switch, for temperature uncontrolled locations
6 10/100 and 2 100Mb fiber ports, can be connected in strings

Mixed-Media Fiber Hub, 16-port Stackable, 10/100 auto-sensing
Dual Speed 8-port and 16-port Stackables, 10/100 auto-sensing
Stackable Hubs, SNMP Optional

10Mb series and 100Mb series, both w/ optional port modules

Personal Switches

, 10/100Mb

8 port dual speed, Auto-negotiable with fiber option

Personal Hubs

, 100Mb or 10/100Mb

8-port, with two switched ports (1 fiber built in)
Personal Hubs, 10Mb series
8 or 9-port and 4 or 5-Port Personal Hubs, w/ man. up-link sw.

Media Converters, 10Mb and 100Mb series

All media combinations, incl. fiber ST, SC, mm., single mode

The “X-line” of configurable MiXed Media products:
Stackable Concentrators, SNMP optional, 13-Ports
Mini-Concentrators, 7 Ports, Repeaters, 2-Ports

Repeater Port Modules (RPMs), 6 types for Ethernet media
Bridge Port Modules (BPMs), 4 types, for segment isolation

Fan-Outs, 10Mb series
2, 4 and 8 Port Models

Transceivers, 10Mb and 100Mb series 10Mb Mini-Transceivers

and Coax Models, All Types

Oct, 04

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1.0 SPECIFICATIONS

1.1 Technical Specifications

Performance

Aggregate Filtering Rate: 3M pps within each 20 port bank (all ports
100Mbps speed), 298K pps between port banks, 6M pps for all 40 ports
(all ports are wire speed)
Aggregate Forwarding Rate:(for Magnum 4K-Series Fast Ethernet ports)
(all ports are wire speed) 14.4M frames per second, 40-port units
Data Rate: 10 Mbps and 100Mbps

Address Table Capacity: 4K node addresses, self-learning with

address aging
Packet buffer size : 2 MB dynamic
Latency: 5 s + packet time (100 to 100Mbps)
15 s + packet time (10 to 10 Mbps, and 10 to 100Mbps)
PDV: 50BT
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 100Mb 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)

Connectors for copper wiring
Twisted Pair at 10/100Mb: RJ-45 shielded, female, front mounted

(for Magnum 4K-Series Fast Ethernet copper ports, use Cat 5 cable)

Manual switch-selections and jumpers

Fiber default: Full-duplex (Manual DIP switch settings inside of the chassis

can select each of fiber ports to HDX mode. DIP switch SW4 controls fiber
port # 2, whereas DIP switch SW6 controls fiber port #4. Down position will
sets half-duplex, up position (default) sets full-duplex).

Copper default: Auto-negotiation

LEDs: Per Port
LK/Act: Steady ON for Link with no traffic, blinking indicates port is

transmitting and receiving
FDX/Col: ON = Full-Duplex Mode
BLINKING = Half-Duplex Collision
100/10: ON = 100Mbps speed
OFF = 10 Mbps

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Operating Environment

Ambient Temperature: 32 to 120 F (0 to 50C)
Storage Temperature: -40to 160F (-40to 70C)
Ambient Relative Humidity: 5% to 95% (non-condensing)
Altitude: -200 to 13000ft (-60 to 4000m)
Conformal coating option: Request quote

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

4.45cm H x 43.2cm W x 22.9cm D
Weight: 7.1 lb. (3.2 Kg) rack-mount models
Cooling method: Fan cooled, @ 7 cfm

Power Supply (Internal)

AC Power Connector: IEC-type, male recessed at rear of chassis,

with adjacent manual ON-OFF switch (on AC models only)
Input Voltage: 110 to 240 VAC (auto-ranging)
Input Frequency: 47 to 63 Hz (auto-ranging)
Power Consumption: 28 watts typical
35 watts max
Power Supply Rating: 3Amps at 5VDC

DC Power Supply (Options)

-48VDC Power Input Voltage : 36 to 72 VDC (auto ranging)
24VDC Power Input Voltage : 20 to 40VDC
125VDC Power Input Voltage : 120 to 160VDC

Std. Terminal Block : “ -, GND, + ”
Power Consumption: same as for AC models, see above

For Dual Source and Redundant DC for –48VDC, 24VDC Power &
125VDC supply options (Optional), see Appendices

.

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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2.0 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 that 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 Magnum 4K220CR Switch
1 AC Power Cord (U.S. and other 115 VAC only)
1 Set of metal “Ears” for standard 19” rack mounting

1 Installation and User Guide (this manual)
1 Product Registration Card
Remove the items from the shipping container. Be sure to keep the shipping

container should you need to re-ship the unit at a later date. To validate the product
warranty, please complete and return the enclosed Product Registration Card to
GarrettCom, Inc. as soon as possible.

In the event there are items missing or damaged, contact the party from whom
you purchased the product. If the unit needs to be returned, please use the original
shipping container if possible. Refer to Section 6, Troubleshooting, for specific return
procedures.

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2.2 Product Description - Magnum 4K220CR Switches

Magnum 4K220CR Switches boost the performance of large Ethernet LANs,
with economical solution per switched port. The Magnum 4K220’s provide the
switching speed and the reliability to support multiple workgroups, each with its own
switched 100Mbps or 10Mbps domain, for increased network performance.

Designed specifically for the vertical rack space environment, the Magnum
4K220CR used in departments with multiple workgroups, in remote offices and in
network traffic centers or multi-system power users, the Magnum 4K220CR witches are
easy to install and use. Addresses of attached nodes are automatically learned and
maintained, adapting the switching services to network changes and expansions. Front­mounted LEDs provide status information on each port. The Magnum 4K-Series
Switches provide high performance plug-and-play operation in convenient rack-mount
packages.

The reverse port enclosure of Magnum 4K220CR switches are designed to
provide ease of maintainability to the larger network. The 40-port density in a 1U rack
mount “reverse” package is obtained by dedicating the front of the unit to the LED
indicators, and the rear side of the unit to wiring and power supply connection.

The Magnum 4K220CR switches are non-blocking on all ports and include
2MB dynamic packet buffers and a 4K-node address table for advanced performance as
well as to support large networks. The Magnum 4K-Series Switches, with store-and­forward switching, filter all faulty packets to minimize traffic congestion.

The Magnum 4K220CR switches comes along in a rugged metal enclosure
with an auto-ranging power supply for operation with standard AC power worldwide.

2.2.1 Magnum 4K220 Switch chassis

Magnum 4K220 Switches come with a 40-switched RJ-45 ports enclosed in a

rack-mountable chassis and ready to install in any of the ETSI (19”) and TELCO (23”)
environments by the available brackets.

The LED status indicators and the manual switches are located on the front
panel of Magnum 4K220 Switches. There are Full-duplex/Collision (FDX/COL),
Link/Activity (LINK/ACT) and (100/10) LED indicators for each 10Mbps and
100Mbps domain, for visual indication of the operating status of each domain. The IEC
standard AC power connector (and a manual ON - OFF power switch) is located at the

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rear. Fan-driven cooling air flows left to right.

Fig. 2.2.1: Magnum 4K220CR “Reverse” model, front LEDs and
connections in Rear , AC power supply version

2.2.2: Magnum 4K220CR “Reverse” model, front LEDs and
connections in Rear , -48VDC optional power supply version

The Magnum 4K220CR-48VDC has the LEDs on the front panel, and all
the connecting ports and power feeds are in the back. This is convenient for rack­mounting where cabling is accessed from the rear of the rack while the operating status
LEDs are monitored from the front. Typically such arrangements are found in telco rack
installations.

The Magnum 4K220CR-48VDC is a dual-speed 10/100Mbps switch. The
switching capability allow the Magnum 4K220CR to support multiple workgroups
smoothly, each with its own switched 100Mbps or 10Mbps domain.

The 4K220CR may be equipped with an optional internal -48VDC power
supply (See Appendix A). There is an additional option of a dual-source -48V input
(See Appendix B). The DC power feed options and the high quality and versatility
make the Magnum 4K220CR a good high-availability choice for network traffic center

= X

UPLINK

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1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39

115-230V~ 50/ 60 Hz

Power

Col/FDX

Col/FDX

Magnum 4K220R-Series

Ethernet 10/100 Switch

100M
Col/FDX
Link/Act

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

(-) GND (+ )

48V DC

= X

UPLINK

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1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39

Power

Col/FDX

Col/FDX

Magnum 4K220R-Series

Ethernet 10/100 Switch

100M
Col/FDX
Link/Act

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

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applications telcos, ISPs, broadcast equipment, medical, brokerage firm and financial
facilities.

2.2.3 Up-link port #39 for Cascading

The 4K220CR unit has an Up-link switch, located next to the port#
(39). The thumb-operated slide switch enables the port’s RJ-45 cable to either connect
to a user station or to be cascaded to another hub, when in the cross-over position. (See
Section 4.4 for more details about Up-link). Like all 4K220C ports, Port # 39 is a dual­speed switched port which will sense the speed of the connected device. Use port # 39
in x-position on one 4K220CR and port 1 (or any port) on the second, i.e., use only one
crossover port for a cascaded connection.

When the Up-link port is used to cascade two 4K220C together, the auto-

sensing feature will cause the connecting up-link to operate at 100Mb FDX speed.

2.2.4 4K220C, 10/100 F/H dual-speed switched ports, RJ-45 (copper
only)

The Magnum 4K220CR has 40 switched RJ-45 ports that are dual speed
10/100Mbps and Auto-negotiating. The 10/100Mb switched ports are independently N­way auto-negotiating for operation at 10 or 100Mb speed in full- or half-duplex mode
(as a default setting). They independently move to half-duplex mode at 10 Mb or at
100Mb speed if the device at the other end of the twisted pair cable is half-duplex or is
not an auto-negotiating device.

There are three LED’s for each port. The LK/Act (Link/Activity) steady ON
indicates Link with no traffic, and blinking indicates the port is receiving and
transmitting. The Speed LED indicates operation at 100Mb speed when ON and at 10
Mb speed when OFF (when auto-negotiation is enabled). The Fdx/Col LED is ON to
indicate full-duplex operation and OFF to indicate half-duplex mode and collisions. A
twisted pair cable must be connected into each RJ-45 10/100Mb port and a proper Link
(LK lit) must be made with the device at the other end of the cable in order for the
LEDs to provide valid indications of operating conditions.

2.2.5 Frame Buffering and Latency
The Magnum 4K220CR is a store-and-forward switch. Each frame (or

packet) is loaded into the Switch’s memory and inspected before forwarding can occur.
This technique ensures that all forwarded frames are of a valid length and have the
correct CRC, i.e., are good packets. This eliminates the propagation of bad packets,

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enabling all of the available bandwidth to be used for valid information.
While other switching technologies such as "cut-through" or "express" impose

minimal frame latency, they will also permit bad frames to propagate out to the Ethernet
segments connected. The "cut-through" technique permits collision fragment frames,
which are a result of late collisions, to be forwarded to add to the network traffic. Since
there is no way to filter frames with a bad CRC (the entire frame must be present in
order for CRC to be calculated), the result of indiscriminate cut-through forwarding is
greater traffic congestion, especially at peak activity. Since collisions and bad packets
are more likely when traffic is heavy, the result of store-and-forward operation is that
more bandwidth is available for good packets when the traffic load is greatest.

To minimize the possibility of dropping frames on congested ports, each
Magnum 4K220 Switch dynamically allocates buffer space from a 1MB memory pool,
ensuring that heavily used ports receive very large buffer space for packet storage.
(Many other switches have their packet buffer storage space divided evenly across all
ports, resulting in a small, fixed number of packets to be stored per port. When the port
buffer fills up, dropped packets may result.) This dynamic buffer allocation provides the
capability for the maximum resources of the Magnum 4K220 unit to be applied to all
traffic loads, even when the traffic activity is unbalanced across the ports. Since the
traffic on an operating network is constantly varying in packet density per port and in
aggregate density, the Magnum 4K220 Switches are constantly adapting internally to
provide maximum network performance with the least dropped packets.

When the 4K220 Switch detects that its free buffer queue space is low, the
Switch sends industry standard (full-duplex only) PAUSE packets out to the devices
sending packets to cause “flow control”. This tells the sending devices to temporarily
stop sending traffic, which allows a 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 Magnum 4K220 Switches is a collision-based
flow-control mechanism (when operating at half-duplex only). When the Switch detects
that its free buffer queue space is low, the Switch prevents more frames from entering
by forcing a collision signal on all receiving half-duplex ports in order to stop incoming
traffic.

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The latency (the time the frame spends in the Switch before it is sent along or
forwarded to its destination) of the 4K220 Switches varies with the port-speed types,
and the length of the frame is a variable here as it is with all store-and-forward switches.
The 4K220 Switch’s latency is 5 microseconds plus the packet time. See Section 1.1,
Specifications.

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2.3 Features and Benefits

 100Mb switching services for large, high performance Ethernet

LANs

Magnum 4K220 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.

 RJ-45 (copper) ports with N-way auto-negotiation

RJ-45 ports provide twisted pair segment connections with N-way auto-

negotiation and switching capability per port.

 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.

 Reverse (ports in rear) rack mounting

Magnum 4K220 Switches are in a “reverse” package with LEDs in front

and all wiring and cables in the rear.

 Plug-and-Play installation for high performance switching

Magnum 4K220 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.

 World-wide AC power suppl y, DC optional

An internal auto-ranging AC power supply allows any Magnum 4K220
Switches to be used throughout the world. (A special -48VDC power
supply is optional, see Appendices B and C).

 Non-blocking performance supports multiple workgroups

The 40 ports switching capability of Magnum 4K220s allows them to
support multiple workgroups smoothly, with non-blocking performance
across all segments under any traffic conditions.

 Provide economical solution for larger network and ready to use in
ETSI and Telco environments

The economical Magnum 4K220’s are designed specifically for easy to

use and provide reliability to ETSI and Telco environments.

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2.4 Applications

Magnum 4K220 Switches offer high performance flexibility, and are easily

used in a variety of applications including client/server computing, performance
upgrades of departmental networks, and collapsed backbone applications. The Dual­Speed characteristic of the 4K220 Switches enables them to inter-connect a series of
subnets (one subnet per 4K-Series Switch port) in a LAN traffic center. The subnet
connections may be 100Mbps or 10 Mbps speed and full-or half-duplex mode. The 40­ports non-blocking switching capability of Magnum 4K220’s support larger networks
with multiple workgroups.

Example1: In a setup for a typical small office, a central Switch is needed to provide
for a 40-segment 100Mb Fast Ethernet LAN with switched copper support for 3 high
speed local servers for different departments, and with 15 segmented users and three
printers. In addition, the router and extra ports are for future expansion.

The Magnum 4K220 Switch fits nicely in this environment, and offers future
backbone expansion. The 40 switched copper ports are provided by a Magnum 4K220.
Should the number of servers expand, more than one server can be accessed at full
speed from any switched 4K220 port by any of the users simultaneously.

Fig 2.4c: Magnum 4K220 provides a 10/100Mb Switch with non-blocking
performance for a small office

= X

UPLINK

2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40

1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39

115-230V~ 50/60 Hz

Router

10

10

10

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3.0 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 50

0

C.

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.

6.)

If the intra-building wiring (cabling) is involved with
this product, then it is recommended to have shielded cable and
the shield is grounded at both ends.

Installation: This section describes installation of the Magnum 4K-Series Switches, as
well as connection of the various Ethernet media types.

3.1 Locating Magnum 4K220 Switches

The location of a Magnum 4K-Series Switch is dependent on the physical
layout of the network. Typically the Switch is placed in a central wiring location where
groups of network devices need to be connected in order to communicate with each
other. These Switches are typically rack mounted in a wiring closet (see Section 3.3.2
below), but they have rubber feet and can also be installed on a shelf or table top.

Locate an AC receptacle that is within six feet (2 meters) of the intended
Magnum 4K-Series site. The rugged metal case of the Magnum 4K-Series will
normally protect it from accidental damage in a lab or workplace setting. Maintain an
open view of the front to visually monitor the status LEDs. Keep an open area around
the unit so that cooling can occur from the small fan on the left side, while the unit is in
operation. See figure below.

Figure 3.1: Location of

Magnum 4K220’s cooling

fan exhaust

= X

UPLINK

2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 3 4 36 38 40

1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39

115-230V~ 50/60 Hz

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3.2 Connecting Ethernet Media

The Magnum 4K220 Switches are specifically designed to support twisted pair
Ethernet media. The media types supported along with the corresponding IEEE 802.3
and 802.3u standards are as follows:

IEEE Standard

Media Type Max. Distance Port Module

Copper:

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

RJ45

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

The RJ-45 ports of the Magnum 4K-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

NOTE : 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.

1. Using standard twisted pair media, insert either end of the cable with an RJ-45
plug into the RJ-45 connector of the port. Note that, even though the connector
is shielded, either unshielded 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 Powering the Magnum 4K220CR Switch

Figure 3.5: Magnum 4K220 AC
power connector

= X

UPLINK

2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40

1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39

115-230V~ 50/60 Hz

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= X

UPLINK

2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38

1 3 5 7 9 11 13 15 1 7 19 21 23 25 27 2 9 31 33 35 37 39

115-230V~ 50/60 Hz

= X

UPLINK

2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38

1 3 5 7 9 11 13 15 1 7 19 21 23 25 27 2 9 31 33 35 37 39

115-230V~ 50/60 Hz

= X

UPLINK

2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38

1 3 5 7 9 11 13 15 1 7 19 21 23 25 27 2 9 31 33 35 37 39

115-230V~ 50/60 Hz

= X

UPLINK

2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38

1 3 5 7 9 11 13 15 1 7 19 21 23 25 27 2 9 31 33 35 37 39

115-230V~ 50/60 Hz

Magnum 4K-Series Switches incorporate an internal universal power supply, and have a
recessed male IEC connector for the AC power cord at the left-rear.

A manual AC power ON-OFF switch is adjacent. A six-foot 115 VAC 60 Hz

standard power cord is supplied with each unit shipped within North America.
For DC power options, see Appendices.

3.4 Rack-mounting

Installation of a Magnum 4K220 Switch in a 19” rack or a 23” rack is a

simple procedure. The units are 1U (1.75”) high. When properly installed, the front-

mounted LED status indicators

should be in plain view and easy to

read. Rack-mount installation

requires special rack-mounted

brackets and screws (included with each 4K220 unit). The brackets attach to the front

sides of the Switch, and then fastened into a standard 19” rack or 23” rack.

The 23”
brackets and ETSI brackets are
also available (optional) for
Rack-mounting purpose with
Magnum 4K Series Switches.
The 23” brackets are more
popular in TELCO Industry
and consider as a standard for
Rack-mounting purpose. The
23” brackets are mainly being
used for Huge rack-mounting
frame to provide more secure
and stability to the unit in the
TELCO industry.

The ETSI (European
standard) brackets are
moreover looks similar to the
23”

Fig 3.3 Multiple
Magnum 4K220 units rack-mounted in a 23” Rack-mount frame

brackets and mostly used in the ETSI standard industry.
The optional 23” brackets and the ETSI brackets come in a package along with the

necessary screws for the convenient to the customer

= X

UPLINK

2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40

1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39

115-230V~ 50/60 Hz

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4.0 OPERATION

This chapter describes the functions and operation of the 4K-Series.

4.1 Switching Functionality

Magnum 4K-Series units provide switched connectivity at Ethernet wire-

speed among all of its ports simultaneously. They support 10/100Mbs for copper media
and 100Mb for fiber ports to maximize bandwidth utilization and network performance.
All ports can communicate to all other ports in a Magnum 4K-Series, but local segment
traffic on a port will not consume any of the bandwidth on any other port.

Magnum 4K-Series units are plug-and-play devices. There is no software
configuring to be done at installation or for maintenance. The only hardware
configuration settings are user options for UP-LINK on RJ-45 port. The internal
functions of both are described below.

Filtering and Forwardi ng
Each time a packet arrives on one of the switched ports, the decision is taken

to either filter or to forward the packet. Packets whose source and destination addresses
are on the same port segment will be filtered, constraining them to that one port and
relieving the rest of the network from processing them. A packet whose destination
address is on another port segment will be forwarded to the appropriate port, and will
not be sent to the other ports where it is not needed. Traffic needed for maintaining the
operation of the network (such as occasional multi-cast packets) is forwarded to all
ports.
The Magnum 4K-Series Switches operate in the store-and-forward switching

mode, which eliminates bad packets and enables peak performance to be achieved when
there is heavy traffic on the network.

Address Learning
All 40-port Magnum 4K-Series units have address table capacity of 4K node

addresses, suitable for use in large networks. They are self-learning, so that as nodes are
added or removed or moved from one port / segment to another, the 4K220 Switch
automatically keeps up with node locations.

An address-aging algorithm causes least-used addresses to fall out of the
address buffer in favor of new and frequently-used addresses. To reset the address
buffer, cycle power down-and-up.

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4.2 Status LEDs

For Magnum 4K220 models :

PWR : Power LED, ON when external power is applied to the unit.

Link/Act : Steady ON for link with no traffic, blinking indicates port is

transmitting and receiving.

FDX/Col : Full / Half duplex LED, steady ON when the port is running

full duplex, blinking for collisions

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

speed is 10 Mbps

4.3 Up-link Port, for RJ-45 Port #39 (only)

Magnum 4K220’s each have one Up-link port, port # 39, with a thumb
operated slide switch for regular (=) or crossover (X) connections. The Up-link port
allows non-node (switch-to-repeater, switch-to-switch, etc.) connections without a
special cross-over cable. It works the same for 10Mb or 100Mb connections.

Use port #39 in the = position (or ports 1 thru 40) for straight-through
twisted pair cabling from the 4K220 switched port to a user device. Use port #39 in
the “X” port for cross-over or up-link segment connections to a repeater or hub or
switch. Verify proper port connection by noting the port’s LINK/ACT status, which
is illuminated when a proper link is made, and is blinking when there is activity.

4.4 Auto-negotiation for RJ-45 (copper) ports

The 4K220CR Switch’s RJ-45 copper ports are N-way auto-negotiation.
There are 4 different speed and F/H modes selection depending on what the other
device supports. These are: (1) 100Mb full-duplex, (2) 100Mb half-duplex, (3) 10 Mb
full-duplex and (4) 10 Mb half-duplex.

The auto-negotiation logic will attempt to operate in descending order and
will normally arrive at the highest order mode that both devices can support at that time.
(Since auto-negotiation is potentially an externally-controlled process, the original
“highest order mode” result can change at any time depending on network changes that
may occur). If the device at the other end is not an auto-negotiating device, the 4K220­Switch’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 standard.

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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 auto-negotiation 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.

 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 limited within that collision domain. The Path Delay Value (PDV) bit-times
must account for all devices and cable lengths within that domain. For Magnum 4K­Series switched ports operating at 100Mb half-duplex, the bit time delay is 50BT.

4.5 Auto-negotiation, full-duplex mode

Full-duplex Ethernet provides separate Transmit and Receive data paths,
enabling simultaneous bi-directional collision-free data movements on a port. The
network topology must be a “star” type, not a “bus” type. With full-duplex mode, the
cable distance is only limited by the physical layer line driver and cable attenuation.
There are no collision-domain restrictions or limitations.

The Magnum 4K-Series Switches perform half- or full-duplex mode auto­negotiation independently on all switched ports. If the device or node on the other end
of a port’s attached cable supports F/H mode, auto-negotiation or is set to operate as
full-duplex, the Magnum 4K220 Switch will negotiate to run full-duplex. If the
attached device or node doesn’t support F/H mode, auto-negotiation (for example, if it
is a 10 Mb repeater or a standard 100Mb hub), the 4K220-Switch’s RJ-45 ports will
default to operate at half-duplex.

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4.6 Flow-control, IEEE 802.3x standard

Magnum 4K- Series Switches incorporate a flow-control mechanism for Full-

Duplex mode. The purpose of flow-control is to reduce the risk of data loss if a long
burst of activity causes the switch to save frames until its buffer memory is full. This is
most likely to occur when data is moving from a 100Mb port to a 10 Mb port, and the
speed difference makes the 10Mb port unable to keep up. It can also occur when
multiple 100Mb ports are attempting to transmit to one 100Mb port, and in other
protracted heavy traffic situations.

Magnum 4K-Series Switches implement the 802.3x flow control (non­blocking) on Full-Duplex ports, which provides for a “PAUSE” packet to be transmitted
to the sender when the packet buffer is nearly filled and there is danger of lost packets.
The transmitting device is commanded to stop transmitting into the switched port for
sufficient time to let the Switch reduce the buffer space used. When the available free­buffer queue increases, the Switch will send a “RESUME" packet to indicate the
transmitter to start sending the packets. Of course, the transmitting device must also
support the 802.3x flow control standard in order to communicate properly during
normal operation.

Note: When in Half-Duplex mode, the 4K220-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.

5.0 TROUBLESHOOTING

All Magnum Ethernet products are designed to provide reliability and
consistently high performance in all network environments. The installation of
Magnum 4K220 Series Switches is a straightforward procedure (see INSTALLATION,
Section 2.6); the operation is also straightforward and is discussed in Section 4.

Should problems develop during installation or operation, this section is
intended to help locate, identify and correct these types of problems. Please follow the
suggestions listed below prior to contacting your supplier. However, if you are unsure
of the procedures described in this section or if the Magnum 4K220 Series Switch is not
performing as expected, do not attempt to repair the unit; instead contact your supplier
for assistance or contact GarrettCom Customer Support.

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5.1 Before Calling for Assistance

1. If difficulty is encountered when installing or operating the unit, refer back to
the Installation Section of the applicable chapter of this manual. Also check
to make sure that the various components of the network are interoperable.

2. Check the cables and connectors to ensure that they have been properly
connected and the cables/wires have not been crimped or in some way
impaired during installation. (About 90% of network downtime can be
attributed to wiring and connector problems.)

3. Make sure that an AC power cord is properly attached to each Magnum

4K220 unit. Be certain that each AC power cord is plugged into a functioning

electrical outlet. Use the PWR LEDs to verify each unit is receiving power.

4. If the problem is isolated to a network device other than the Magnum 4K220

product, it is recommended that the problem device is replaced with a known

good device. Verify whether or not the problem is corrected. If not, go to

Step 5 below. If the problem is corrected, the Magnum 4K220 Series

Switches

and its associated cables are functioning properly.

5. If the problem continues after completing Step 4 above, contact your supplier

of the Magnum 4K220 unit or if unknown, contact GarrettCom, Inc.by fax,

phone or email ([e-mail]) for assistance.

5.2 When Calling for Assistance

Please be prepared to provide the following information.

1. A complete description of the problem, including the following points:
a. The nature and duration of the problem;
b. Situations when the problem occurs;
c. The components involved in the problem;
d. Any particular application that, when used, appears to create the problem;

2. An accurate list of GarrettCom product model(s)involved, with serial
number(s). Include the date(s) that you purchased the products from your
supplier.

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3. It is useful to include other network equipment models and related hardware,

including personal computers, workstations, terminals and printers; plus, the
various network media types being used.

4. A record of changes that have been made to your network configuration prior

to the occurrence of the problem. Any changes to system administration
procedures should all be noted in this record.

5.3 Return Material Authorization (RMA) Procedure

All returns for repair must be accompanied by a Return Material
Authorization (RMA) number. To obtain an RMA number, call GarrettCom
Customer Service at [phone] during business hours in California or email to
[e-mail]). When calling, please have the following information
readily available:

Name and phone number of your contact person.
Name of y our company / institution
Your shipping address
Product name
Serial Number (or Invoice Number)
Packing List Number (or Sales Order Number)

Date of installation
Failure symptoms, including a full description of the problem.

GarrettCom will carefully test and evaluate all returned products, will repair
products that are under warranty at no charge, and will return the warranty-repaired
units to the sender with shipping charges prepaid (see Warranty Information,
Appendix A, for complete details). However, if the problem or condition causing
the return cannot be duplicated by GarrettCom, the unit will be returned as:

No Problem Found.

GarrettCom reserves the right to charge for the testing of non-defective
units under warranty. Testing and repair of product that is not under warranty will
result in a customer (user) charge.

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5.4 Shipping and Packaging Information

Should you need to ship the unit back to GarrettCom, please follow these
instructions:

1. Package the unit carefully. It is recommended that you use the original

container if available. Units should be wrapped in a "bubble-wrap" plastic
sheet or bag for shipping protection. ( You may retain all connectors and
this Installation Guide.)

CAUTION

:

Do not pack the unit in Styrofoam "popcorn" type packing

material. This material may cause electro-static shock damage to the unit.

2. Clearly mark the Return Material Authorization (RMA) number on the

outside of the shipping container.

3. GarrettCom is not responsible for your return shipping charges.

4. Ship the package to:

GarrettCom, Inc.

47823 Westinghouse Drive

Fremont, CA 94539
Attn.: Customer Service

APPENDIX A: WARRANTY INFORMATION

GarrettCom, Inc. warrants its products to be free from defects in
materials and workmanship for a period of three (3) years from the date of
shipment by GarrettCom.

During this warranty period, GarrettCom will repair or, at its option,
replace components in the products that prove to be defective at no charge other
than shipping and handling, provided that the product is returned pre-paid to
GarrettCom.

This warranty will not be effective if, in the opinion of GarrettCom, the
product has been damaged by misuse, misapplication, or as a result of service or
modification other than by GarrettCom.

GarrettCom reserves the right to make a charge for handling and
inspecting any product returned for warranty repair which turns out not to be
faulty.

Please complete the warranty card as this acts as a product registration,
and mail it to GarrettCom within two weeks of your purchase.

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APPENDIX B : Internal DC Power Supply Option

B1.0 SPECIFICATIONS - FOR MAGNUM 4K-SERIES SWITCHES

Power Supply (Internal -48VDC Option)
DC Power Connector: 3 terminals: “

-

“, “GND”, “+”
Input Voltage: 36 - 70 VDC (auto-ranging)
Power Consumption: Model 4K24: 28 watt typical, 35 watts max.

Power Supply (Internal 24 VDC Option) Industrial Appl i cation
DC Power Connector: 3 terminals: “

-

“, “GND”, “+”
Input Voltage: 20 - 40 VDC (auto-ranging)
Power Consumption: Model 4K24: 28 watt typical, 35 watts max.

Power Supply (Internal 125 VDC Option) Industrial Application
DC Power Connector: 3 terminals: “

-

“, “GND”, “+”
Input Voltage: 120 - 160 VDC (auto-ranging)
Power Consumption: Model 4K24: 28 watt typical, 35 watts max.

With the exception of the power supply, all specifications and functions of

Magnum 4K-Series-48VDC, 24VDC and 125VDC models are identical to those
listed in the main manual.

B2.0 -48VDC, 24VDC & 125VDC POWER OPTION, THEORY OF
OPERATION

The -48VDC, 24VDC & 125VDC power option are designed using diodes
inside on each DC power input line behind the two external power connection
terminals, so that the power from an
external source can only flow into
the hub. This allows the Switch to
operate only whenever DC power is
correctly applied to the two inputs.
It protects the Switch from incorrect DC input connections. An incorrect polarity
connection, for example, will neither effect the Switch, nor its power supply internally,
nor will it blow the fuse in the internal power supply.
The manual power “On-Off” Switch (optional) is used for powering the unit
on and off when it is placed into or taken out of service.

B3.0 APPLICATIONS

Magnum 4K-Series Fiber Switches are easily installed in a variety of
applications where -48VDC, 24VDC & 125VDC power is used as the primary power
source. The- 48VDC, 24VDC & 125VDC power configuration provides an Ethernet

A+

A-

GND

GND

CHASSIS

FUSE

+

-

SUPPLY

HUB

POWER SWITCH

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networking solution utilizing a special power supply in hubs with a proven track record.
The –48VDC solution is particularly useful in the telecommunication
industry, where it is common for facilities to operate on -48VDC power. Such
companies include regular and wireless telephone service providers, Internet Service
Providers (ISPs) and other communication companies. In addition, many high
availability equipment services, such as broadcasters, publishers, newspaper operations,
brokerage firms and other facilities often use a battery backup system to maintain
operations in the event of a power failure. It is also frequently used for computer system
backup, management and operations monitoring equipment.
The 24VDC & 125VDC solution are particularly useful in the
Industrial environment, where it is common facilities to operate on 24VDC & 125VDC
power. The 125VDC solution is mainly used in Utilities Industries, such as Electric
substation, Electrical generating plant etc. Whereas 24VDC application is mainly in the
Industrial environment, such as chemical plants, paper mill, stone quarrying plant,
wastewater treatment Plant etc.

B4.0 INSTALLATION

This section describes the installation of the -48 VDC, 24VDC & 125VDC
power source leads to the -48 VDC, 24VDC & 125VDC power terminal block on the
Magnum 4Ks. (see figure below).

Figure B4.1: -48VDC Terminal

Block on Magnum 4Ks-48VDC

The -48VDC terminal
block on the Magnum Ks is
located on the rear of the unit and
is equipped with three (3) screw-down lead posts and it is similar for 24VDC and
125VDC Magnum 4Ks too. The leads are identified as negative (-), positive (+), and
chassis ground (GND). The actual connection procedure is very straightforward.
Simply connect the leads to the Magnum unit, beginning with ground. Ensure that each
lead is securely tightened.

Note: Before connecting to Terminal Block of –48VDC, 24VDC or 125VDC, always
use a digital voltmeter to measure the output voltage of the power supply and
determine the lead which is more “+ve potential Lead”. The more “+ve” voltage
terminal lead from 48V or –48V Power supply must be connected to the post labeled
“+”.
The GND can be hooked at the last.

36-70VDC

_

+

GND

ON
OFF

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An ON-OFF manual switch is included, located in the rear at the DC power
input. This can be used in conjunction with power connections, and as a
RESET for the 4K-Series Switch.

B4.1 UL Requirements

1. Minimum 14 AWG cable for connection to a Centralized DC power source.

2. Fastening torque of the lugs on the terminal block: 9 inch pound max.

3. Centralized DC Power Source cable securement, use at least four cable ties to

secure the cable to the rack at least 4 inches apart with the first one located
within 6 inches of the terminal block.

B5.0 OPERATION

Operation of the Magnum 4Ks with the optional -48VDC, 24VDC &
125VDC power supply is identical to that of the standard AC-powered
models.

B6.0 ORDERING INFORMATION

To order the optional -48VDC power supply factory installed, add

a suffix of “-48VDC” after the product’s standard model # Example:

Magnum 4K220-48VDC.

Similarly to order the optional 24VDC or 125VDC Industrial
specific Power supply factory installed, add a suffix of “ 24VDC” OR
“125VDC” after the product ‘s standard model # Example: Magnum 4K220­24VDC or Magnum 4K220- 125VDC.

B7.0 TROUBLESHOOTING
Please refer to Section 6.0 for troubleshooting

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APPENDIX C: Internal DC Dual-Source Power Option

C1.0 SPECIFICATIONS - FOR MAGNUM 4K-SERIES FIBER SWITCH

Power Supply (Internal, -48VDC Dual-Source, model # Dual-Src-48V)

DC Power Connector: First Source: “A+”, “A

-“

, 2nd Source “B-“, “B+”
GND: Terminal for “earth” or ground wire connection to the hub chassis
Input: Two separate sources, each at 36 - 70 VDC (auto-ranging)
Power Consumption: Model -4K220: 28 watt typical, 35 watts max.

Power Supply (Internal, 24VDC Dual-Source, model # Dual-Src-24V)

DC Power Connector: First Source: “A+”, “A

-“

, 2nd Source “B-“, “B+”
GND: Terminal for “earth” or ground wire connection to the hub chassis
Input: Two separate sources, each at 20 - 40 VDC (auto-ranging)
Power Consumption: Model -4K220: 28 watt typical, 35 watts max.

Power Supply (Internal, 125VDC Dual-Source, model # Dual-Src-125V)

DC Power Connector: First Source: “A+”, “A

-“

, 2nd Source “B-“, “B+”
GND: Terminal for “earth” or ground wire connection to the hub chassis
Input: Two separate sources, each at 120 - 160 VDC (auto-ranging)

Power Consumption: Model -4K220: 28 watt typical, 35 watts max.
With the exception of the dual DC input power connections and the power supply, all
specifications and configuration options for the Magnum 4K220 -48VDC with this Dual­Source option are identical to those listed in the Magnum 4K-Series Fiber Switches
Installation and User Guide, including Appendix B “Internal DC Power Supply Option”

C2.0 MAGNUM 4K-SERIES , with -48VDC, 24VDC & 125VDC Dual-Source
option

The 4K220-Switch models with the internal -48VDC, 24VDC & 125VDC
Dual-Source power supply are designed for installations where a battery plant is the
power source, and where two separate power sources are utilized in order to increase
operational uptime and to simplify maintenance.

The functionality of the Magnum 4K-Series -48VDC, 24VDC & 125VDC

Dual-Source Option units are identical to the standard AC-powered models. Refer to
the main sections of this Installation and User Guide for a detailed description of the
Magnum 4K-Series Switches.

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C3.0 DUAL-SOURCE OPTION, THEORY OF OPERATION

The Dual-Source DC power option is designed using diodes inside of the
chassis on each DC power input line.
A diode is placed in each of the four
input lines (behind the four external
power connection terminals) so that
power from an external source can
only flow into the unit. This allows
the unit to operate whenever DC power is correctly applied to either or both of the two
inputs

C4.0 FEATURES AND BENEFITS OF THE DUAL-SOURCE DESIGN

a) The Switch unit can receive power from either input, “A” or “B”. The hub will normally

draw its power from the DC source with the highest voltage at a given time.

b) The Switch unit will not allow power to flow from a higher voltage input to a lower voltage

input, i.e. the two DC power sources are not mixed together by the hub.

c) When one correct DC input is present, the Switch will receive power if the other DC input is

absent, or even if it is connected with reverse polarity or shorted or grounded.

d) Reverse polarity connections, if they should accidentally occur on either input, will not

damage the Switch or power supply internally (nor will it blow the fuse in the internal power
supply) because of the blocking action of the diodes. This is true even if one input
connection is reversed while the Switch is operating from the other source.

e)

The Switch will not receive power (and will not work) when both inputs are simultaneously
absent or are both incorrectly connected.

C5.0 INSTALLATION

This section describes the proper connection of the -48VDC, 24VDC &
125VDC dual source leads to the -48VDC power terminal block on the Magnum 4K­Series Switch (shown in Figure )
The -48VDC terminal block on the Magnum 4K-Series Switch, as shown in Fig C5.0 is
located on the right rear of the unit and
is equipped with five (5) screw-down
lead posts. The primary terminals are
identified as positive (A+), negative
(A-), and the secondary power
terminals as negative (B-),
positive(B+), and the chassis “earth”
or ground (GND), #6 nut.
Figure C5.0: -48VDC Dual-Source, wiring connections to the External
Terminal Block on a Magnum 48VDC with Dual-Source option

Note: Before connecting to Terminal Block of –48VDC, 24VDC or 125VDC, always
use a digital voltmeter to measure the output voltage of the power supply and
determine the lead which is more “+ve potential Lead”. The more “+ve” voltage
terminal lead from 48V or –48V Power supply must be connected to the post labeled
“+”.
The GND can be hooked at the last.

GND

FUSE

+

-

SUPPLY

A+

A­B-

B+

GND

CHASSIS

HUB

36-70VDC

GND

A+ A- B- B+

36-70VDC

Magnum 4K220 Switches Installation and User Guide (10/04)

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The connection procedure is straightforward. Simply connect the DC leads to the
Switch’s power terminals, positive (+) and negative (-) screws. The use of Ground
(GND) is optional; it connects to the Switch chassis. Ensure that each lead is securely
tightened.
The 24VDC & 125VDC terminal block on Magnum 4K-Series Switch also has
everything similar to –48VDC info. Described above.

C5.1 UL Requirements
The following must be adhered to in order to conform to UL requirements:

1. Minimum 14 AWG cable for connection to a Centralized DC power source.

2. Fastening torque of the lugs on the terminal block: 9 inch pound max.

3. Centralized DC Power Source cable securement, use at least four cable ties to

secure the cable to the rack at least 4 inches apart with the first one located
within 6 inches of the terminal block.

C6.0 ORDERING INFORMATION
To order the optional Dual-Source

-48VDC power supply factory installed,

order “Dual-Src48V” as a separate line item following the product model.

Example: Magnum 4K220-48VDC
Dual-Src-48V for regular dual-source model w/ ON-OFF

switch or Dual-Src48V-NOSWITCH

Similarly to order the optional Dual –source

24VDC power supply factory

installed, order “Dual-Src24V” , and for Dual-source

125VDCpower supply
factory installed, order “Dual-Src125V” as a separate line item following the
product model. Also order for Regular, or No Switch as mentioned above.

C7.0 OPERATION
Operation of the Dual-Source Magnum 4K-Series-48VDC, 24VDC &

125VDC Switch models are identical to that of the standard models.