GarrettCom Magnum 4K220 User manual

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Corporate Headquarters
GarrettCom, Inc.
213 Hammond Ave.
Fremont, CA 94539
Phone [phone]
Fax [phone]
Website: http://www.GarrettCom.com
email [email protected]
Magnum 4K-Series
4K Switches
Installation and User Guide
= 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
(-) GND (+)
48V DC = 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
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 [email protected]
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 S PECIFICATIONS .................................................................1
2.0 INTRODUCTION..................................................................................3
2.1 I NSPECTING THE P ACKAGE AND P RODUCT ............................................3
2.2 P RODUCT D ESCRIPTION - M AGNUM 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 B ENEFITS ......................................................................9
2.4 A PPLICATIONS .....................................................................................10
3.0 INSTALLATION................................................................................11
3.1 L OCATING M AGNUM 4K220 S WITCHES ..............................................11
3.2 C ONNECTING E THERNET M EDIA .........................................................12
3.2.1 Connecting Twisted Pair ............................................................12
3.3 P OWERING THE M AGNUM 4K220CR S WITCH .....................................12
3.4 R ACK - MOUNTING ..................................................................................13
4.0 OPERATION........................................................................................14
4.1 S WITCHING F UNCTIONALITY ...............................................................14
4.2 S TATUS LED S .....................................................................................15
4.3 U P - LINK P ORT , 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 C ALLING FOR A SSISTANCE ....................................................18
5.2 W HEN C ALLING FOR A SSISTANCE .......................................................18
5.3 R ETURN M ATERIAL A UTHORIZATION (RMA) P ROCEDURE .................19
5.4 S HIPPING AND P ACKAGING I NFORMATION ..........................................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.

Magnum 4K220 Switches Installation and User Guide (10/04)
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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 Mi X ed 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. Front-
mounted 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-and-
forward 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 rack-
mounting 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
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Magnum 4K220R-Series
Ethernet 10/100 Switch
100M
Col/FDX
Link/Act
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Col/FDX Col/FDX
Magnum 4K220R-Series
Ethernet 10/100 Switch
100M
Col/FDX
Link/Act
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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 dual-
speed 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 N-
way 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 supply, 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 Dual-
Speed 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 40-
ports 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
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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
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 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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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 17 19 21 23 25 27 29 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 17 19 21 23 25 27 29 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 17 19 21 23 25 27 29 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 17 19 21 23 25 27 29 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 Forwarding
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 4K220-
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 standard.