RFL Electronics RFL 3000 4K24F User manual

Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
RFL Electronics Inc.
RFL 3000 4K-16 Ethernet Switch
Installation and User Guide

Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
April 27, 2006
RFL 3000™4K-Series
4K24 Switches
Installation and User Guide
Trademarks
Ethernet is a trademark of Xerox Corporation
NEBS is a trademark of Telcordia Technologies
UL is a registered trademark of Underwriters Laboratories
Important: The RFL 3000 4K24 Switches contains no user serviceable parts.
Attempted service by unauthorized personnel shall render all warranties null and
void. If problems are experienced with the RFL 3000 4K24 Switches, consult
Section 6, Troubleshooting, of this User Guide.
Copyright ©2003 RFL All rights reserved. No part
of this publication may be reproduced without prior written permission from
RFL

Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
Contacting RFL
Please use the mailing address, phone and fax numbers and email address listed below:
RFL Electronics Inc.
353 Powerville Road
Boonton TWP, NJ 07005-9151
Phone [phone]
Fax [phone]
Website: http://www.rflelect.com
email [email protected]m
Federal Communications Commission
Radio Frequency Interference Statement
Warning: Changes or modifications to this unit not expressly approved by the party
responsible for compliance could void the user’s authority to operate the equipment.
NOTE: This equipment has been tested and found to comply with the limits for a class
B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential installation.
This equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause harmful interference
in a residential installation. This equipment generates, uses, and can radiate frequency
energy and, if not installed and used in accordance with the instructions, may cause
harmful interfernce to radio communications. However, there is no guarantee that
interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause
harmful interference to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures.
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into n outlet on a ccircuit different from that to
which the receiver is connected.
- Consult the dealer or an experienced radio TV technician for help.
Canadian Emission
This Class B digital apparatus meets all requirements of the Canadian
Interference-Causing Equipment Regulations.

Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
1.0 SPECIFICATIONS.......................................................................................................................... 5
1.1 Technical Specifications............................................................................................................... 5
1.2 Ordering Information .................................................................................................................. 8
2.0 Introduction...................................................................................................................................... 8
2.1 Inspecting the Package and Product........................................................................................... 8
2.2 Product Description - RFL 3000 4K24 Switches........................................................................ 9
2.2.1 RFL 3000 4K24F and 4K24C Switch chassis ..................................................................... 9
2.2.2: RFL 3000 4K24FR “Reverse” model, front LEDs and connections in rear........................ 10
2.2.3 Up-link, port 1X for Cascading ......................................................................................... 11
2.2.4 Fiber-port options for 4K24F Model, 100Mb fiber ............................................................. 11
2.2.5 4K24C, 10/100 F/H dual-speed switched ports, RJ-45 (copper only)............................. 12
2.2.6 Frame Buffering and Latency ........................................................................................... 12
2.3 Features and Benefits................................................................................................................. 13
2.4 Applications................................................................................................................................. 14
3.0 Installation ...................................................................................................................................... 16
3.1 Locating RFL 3000 4K24 Switches ........................................................................................... 16
3.2 Connecting Ethernet Media....................................................................................................... 17
3.2.1 Connecting Fiber Optic ST-type, “twist-lock”................................................................ 17
3.2.2 Connecting Fiber Optic SC-type and MTRJ, "Snap-In" ............................................... 18
3.2.3 Connecting Single-Mode Fiber Optic................................................................................ 18
3.2.4 Connecting Twisted Pair (RJ-45,CAT3, CAT5, Unshielded or Shielded)..................... 19
3.3 Rack-mounting ............................................................................................................................ 19
3.4 Installing and Removing FKM Fiber Port Modules................................................................ 20
3.4.1 Preparation for Changing FKM Fiber Port Modules ..................................................... 21
3.4.2 Installing FKM Modules in RFL 3000 4K24F Switches.................................................. 22
3.4.3 Removing FKM Modules from RFL 3000 4K24F Switches............................................ 23
3.5 Manual settings for Fiber ports (HDX or FDX) ...................................................................... 24
3.6 Powering the RFL 3000 4K24 Switch....................................................................................... 25
4.0 OPERATION.................................................................................................................................. 25
4.1 Switching Functionality ............................................................................................................. 25
4.2 Status LEDs................................................................................................................................. 26
4.3 Up-link Port, for RJ-45 Port #1X only...................................................................................... 26
4.4 Auto-negotiation for RJ-45 (copper) ports............................................................................... 27
4.5 Auto-negotiation, full-duplex mode........................................................................................... 28
4.6 Flow-control, IEEE 802.3x standard......................................................................................... 28
4.7 Power Budget Calculations for 4K-Series with Fiber Media.................................................. 29
5.0 Introduction - RFL 3000 4K24 Fiber-Port Modules (FKM’s).................................................... 29
5.1 Inspecting the Package and Product (Optional)...................................................................... 30
5.2 Product Description.................................................................................................................... 30
5.2.1 FKM-MST, 100Mbps multi-mode FX-ST-type, “twist-lock” connector ..................... 30
5.2.2 FKM-MSC 100Mbps multi-mode FX-SC-type, “snap-in” connector.......................... 31
5.2.3 FKM-SSC and –SSCL 100Mbps single-mode FX-SC-type, “snap-in”......................... 31
5.2.4 FKM-MTRJ, 100Mb multi-mode FX, MTRJ small-form-factor connector ............... 31
5.2.5 FKM-Blank......................................................................................................................... 32
6.0 TROUBLESHOOTING................................................................................................................. 32
6.1 Before Calling for Assistance..................................................................................................... 32
6.2 When Calling for Assistance...................................................................................................... 33
6.3 Return Material Authorization (RMA) Procedure.................................................................. 33
6.4 Shipping and Packaging Information....................................................................................... 34
APPENDIX A: WARRANTY INFORMATION.................................................................................... 35
APPENDIX B : Internal DC Power Supply Options............................................................................... 36
APPENDIX C: Internal DC Dual-Source Power Option........................................................................ 39

Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
1.0 SPECIFICATIONS
1.1 Technical Specifications
Performance
Aggregate Filtering Rate: 4.8Gb/sec for 24 100Mbps ports
(all ports are wire speed)
Aggregate Forwarding Rate: (for RFL 3000 4K-Series Fast Ethernet
ports)
(all ports are wire speed)14.4M frames per second, 24-port units
Data Rate: 10 Mbps and 100Mbps
Address Table Capacity: 2K node addresses, self-learning with address aging
Packet buffer size : 1 MB dynamic
Latency: 5 μs + packet time (100 to 100Mbps)
15 μs + packet time (10 to 10 Mbps, and 10 to 100Mbps)
Network Standards
Ethernet V1.0/V2.0 IEEE 802.3: 10BASE-T,
IEEE 802.3u: 100BASE-TX, 100BASE-FX
Maximum 10 Mbps Ethernet Segment Lengths
Unshielded twisted pair - 100 m (328 ft)
Shielded twisted pair - 150 m (492 ft)
10BASE-FL multi-mode fiber optic - 2 km (6,562 ft)
10BASE-FL single-mode fiber optic - 10 km (32,810 ft)
Maximum Standard 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)
100BASE-FX, half-duplex, multi-mode - 412 m (1350 ft)
100BASE-FX, full-duplex, multi-mode - 2.0 km (6,562 ft)
100BASE-SX, short wavelength HDX m.m. - 300 m ( 935 ft)
100BASE-FX, half-duplex, single-mode - 412 m (1350 ft)
100BASE-FX, full-duplex, single-mode - 20.0 km (49,215 ft)
100BASE-FX, full-duplex, s.m. (Long Reach)- 40.0 km (132,215 ft)
Connectors for copper wiring
Twisted Pair at 10/100Mb: RJ-45 shielded, female, front mounted
(for RFL 3000 4K-Series Fast Ethernet copper ports, use Cat 5 cable)
Fiber Multi-mode connector types:
Fiber Port, SC-type (snap-in): Fiber optic multi-mode, 100BASE-FX
Fiber Port, ST-type (twist-lock): Fiber optic multi-mode, 100BASE-FX
Fiber Port, MTRJ-type (plug-in): Fiber optic multi-mode, 100BASE-FX

Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
Fiber Single-mode connector types:
Fiber Port, SC-type: Fiber optic single-mode, 100BASE-FX
Fiber Port, SC-type: Fiber optic "long-reach” single-mode, 100BASE-FX
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
Operating Environment
Ambient Temperature: 25°to 140°F (-5°to 60°C)
Storage Temperature: -40°to 185°F (-40°to 85°C)
Ambient Relative Humidity: 5% to 95% (non-condensing)
Altitude: -200 to 13,000 ft. (-60 to 4000m)
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: 20 watts typical, 35 watts max
Power Supply Rating: 3Amps at 5VDC

Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
DC Power Supply (Options)
-48VDC Power Input Voltage : 36 to 72 VDC
24VDC Power Input Voltage : 20 to 36VDC
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 & 125VDC
supply options (Optional), see Appendices
Agency Approvals
UL listed (UL1950), cUL, CE
Emissions meet FCC Part 15 Class B
Optional: ETSI and NEBS L3 Certified
Warranty Three years, return to factory. Made in USA

Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
1.2 Ordering InformationRFL 3000 4K24 Switches
MODEL DESCRIPTION
RFL 3000 4K24F Ethernet Switch with 22 RJ-45 ports, each auto-sensing for 10Mbps/10Mbps FDX/HDX
operation. Optional fiber port may be configured from the family of modules below. Each
port is switched and provides a full-speed traffic domain with non-blocking performance.
Includes internal auto-ranging power supply, cooling fan, and metal brackets for rack-
mounting. LEDs and user ports are in the front, power input is in the rear. Units with -
48V power supply options available
RFL 3000 4K24FR “Reverse” model, Same as Model 4K24F Switch except user ports and the power input
connectors are in the rear.
LEDs are in the front.
RFL 3000 4K24C Same as RFL 3000 4K24F, but with all 24 RJ-45 ports “Copper”.
RFL 3000 4K24CR “Reverse” model, Same as Model 4K24C Switch except user ports and the power input
connectors are in the rear.
LEDs are in the front.
Fiber port modules for RFL 3000 4K-Series (Models 4K24F and 4K16):
FKM-2SC Fiber module with two 100Mbps multi-mode FX SC connectors
FKM-2ST Fiber module with two 100Mbps multi-mode FX ST connectors
FKM-2MTRJ Fiber module with two 100Mbps multi-mode FX “MTRJ” Small Form Factor connectors
FKM-2SSC Fiber module with two 100Mbps 20Km single-mode FX SC connectors
FKM-2SSCL Fiber module with two 100Mbps 40 Km “long-reach” single-mode FX SC connectors
FKM-1MTRJ Fiber module for 4K-Series Switches, with one 100Mbps multi-mode FX “MTRJ” Small
Form Factor connector
FKM-1SSC Fiber module with one 100Mbps 20Km single-mode FX SC connectors
FKM-1SSCL Fiber module with one 100Mbps 40 Km “long-reach” single-mode FX SC connectors
FKM-BLNK Blank face plate, included in 4K24 switch unit when no fiber port option is selected
Special Package Models – request quote for specials, such as the “Air Flow Modified” version with –48CDV
power for Telco racks
RFL reserves the right to change specifications, performance
characteristics and/or model offerings without notice.
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 RFL 3000 4K24 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)
1Product Registration Card

Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
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 RFL 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.
2.2 Product Description - RFL 3000 4K24 Switches
RFL 3000 4K24 Switches boost the performance of large Ethernet LANs, with
the flexibility of both twisted-pair switched ports and fiber ports. Fiber ports may
number zero, one or two, and may be configured from a variety of user-selected popular
fiber connectors. The RFL 3000 4K24’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 and with “future-proof” fiber up-link ports built in.
The RFL 3000 24-port 4K24F Switches offer application flexibility with a series
of optional fiber connector types. All applicable fiber port connector types (100Mbps FX-
ST, SC, MTRJ) along with multi-mode, single and “long-haul” capability are
configurable using a family of one- or two -port modules . Optional fiber ports are
normally configured and tested with the RFL 3000 4K24F unit in the factory, but may be
configured in the field. The 22 copper RJ-45 ports are dual speed 10/100 Mb auto-
negotiating. The model 4K24C has 24 twisted-pair ports and no fiber -built-in options.
Designed for use in departments with multiple workgroups, in remote offices and
in network traffic centers or multi-system power users, the RFL 3000 4K24F and 4k24C
Switches 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 RFL 3000
4K-Series Switches provide high performance plug-and-play operation in convenient
rack-mount packages.
The RFL 3000 4K24F and 4K24C switches are non-blocking on all ports and
include 1MB packet buffers and a 2K-node address table for advanced performance as
well as to support large networks. The RFL 3000 4K-Series Switches, with store-and-
forward switching, filter all faulty packets to minimize traffic congestion.
2.2.1 RFL 3000 4K24F and 4K24C Switch chassis
RFL 3000 4K24F and 4K24C Switches come in a 24-port rack-mountable chassis.
The optional fiber port is user configurable and can be selected from the offered popular
fiber port connector types. The fiber-port modules are normally factory installed. (See
Section 5)

Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
The 4K24F 19” rack-mountable switches come with twenty two 10/100 RJ-45 ports and
two optional 100Mbps fiber ports (ports #2 and #4) i.e., with a total capacity of 24
switched ports. These rack-mount units are typically used in larger network wiring
centers.
2X 4X 6 8 10 12 14 16 18 20 22 24
1 X 1 3 5 7 9 11 13 15 17 19 21 23
Magnum 4024F Switch
100M
Col/FDX
Link/Act
Power 100M
Col/FDX
Link/Act
TX X
2 4X 6 8 10 12 14 16 18 20 22 24
1X 1 3X 5 7 9 11 13 15 17 19 21 23
Magnum 4016C Switch
100M
Col/FDX
Link/Act
Power 100M
Col/FDX
Link/Act
Figure 2.2.1a: Front view, 24-port RFL 3000 4K24F and 4K24C Switches
The LED status indicators and the manual switches are located on the front panel
of RFL 3000 4K24F and 4K24C 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 rear. Fan-
driven cooling air flows left to right.
ON
OFF
110-220
VAC
47-63Hz
1.0-0.5A
Figure 2.2.1b: Rear view - RFL 3000 table-top & rack-mount 4K24C and/or 4K24F Switch
2.2.2: RFL 3000 4K24FR “Reverse” model, front LEDs and connections in rear
Front View, with –48V power option
2 4X 6 8 10 12 14 16 18 20 22 24
(-) GND (+)
48V DC 1 X 1 3X 5 7 9 11 13 15 17 19 21 23
ON
OFF
TX R X TX R X
Rear View
The RFL 3000 4K24FR is like the 4K24F except that the front panel has the
LEDs, 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.
+
GND Magnum 4024F Switch
100M
Col/FDX
Link/Act
Power 100M
Col/FDX
Link/Act

Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
The RFL 3000 4K24FR is dual-speed 10/100Mbps switch and has two fiber
connector port options. The switching capability allow the RFL 3000 4K24F to support
multiple workgroups smoothly, each with its own switched 100Mbps or 10Mbps domain.
The 4K24FR 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
RFL 3000 4K24FR a good high-availability choice for telcos, ISPs, broadcast equipment,
medical, brokerage firm and financial facilities.
2.2.3 Up-link, port 1X for Cascading
The unit has an Up-link Port 1X, located on the left-front side of the hub. It enables the
first port’s RJ-45 cable to either connect to a user station ( port 1) or to be cascaded to
another hub (port 1X) with cross-over. (See Section 4.4 for more details about Up-link).
Like all 4K24C ports, Port # 1X is a dual-speed switched port which will sense the speed
of the connected device. Use port 1X on one 4K24 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 4K24C together, the auto-sensing
feature will cause the connecting up-link to operate at 100Mb FDX speed.
2.2.4 Fiber-port options for 4K24F Model, 100Mb fiber
FH
Figure 2.2.5 Fiber-Ports, FKM-1ST, FKM-1SC, FKM-1MTRJ
Two fiber ports are optional for RFL 3000 4K24F Switch. In a two-fiber port
module, all of the fiber ports are of the same speed, the same multi- or single-mode type,
and the same connector type. Multi-mode 100Mbps models are available with ST, SC,
and MT-RJ connectors. Single-mode 100Mbps models are available with SC connectors.
The 100Mb fiber port modules on the RFL 3000 4K24F normally are set (factory
default) to operate in full-duplex mode for best fiber distance and performance. On the
RFL 3000 4K24F, the user may select full- or half-duplex mode per-port with an internal
jumper setting (See Section 3.4) for the flexibility to adapt to any type of Fast Ethernet
devices.
On RFL 3000 fiber FKMs, there are two LED’s per fiber port mounted on the
front of the chassis. The Link (LK) LED indicates “ready for operation” when lit, and an
LED indicates Receiving Activity (ACT) on the port. A fiber cable must be connected to

Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
each 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 LK LEDs to provide valid indications of operating
conditions.
2.2.5 4K24C, 10/100 F/H dual-speed switched ports, RJ-45 (copper only)
The RFL 3000 4K24C copper has 24 ports that are dual speed 10/100Mb
switched RJ-45 ports 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 4X 6 8 10 12 14 16 18 20 22 24
1X 1 3X 5 7 9 11 13 15 17 19 21 23
Magnum 4016C Switch
100M
Col/FDX
Link/Act
Power 100M
Col/FDX
Link/Act
2.2.6 Frame Buffering and Latency
The RFL 3000 4K24F or 4K24C are store-and-forward switches. 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, 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.

Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
To minimize the possibility of dropping frames on congested ports, each RFL
3000 4K24 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 RFL 3000 4K24 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 RFL 3000 4K24 Switches are constantly adapting internally to
provide maximum network performance with the least dropped packets.
When the 4K24 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 RFL 3000 4K24 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.
The latency (the time the frame spends in the Switch before it is sent along or
forwarded to its destination) of the 4K24 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
4K24 Switch’s latency is 5 microseconds plus the packet time. See Section 1.1,
Specifications.
2.3 Features and Benefits
100Mb switching services for high performance Ethernet LANs
RFL 3000 4K24 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.
Option to configure with one or two fiber ports
Fiber port modules are available with one or two 100Mb mm-ST, SC, MTRJ
or single-mode SC. The configuration flexibility of fiber ports allows 4K24
switches to adapt to mixed and changing fiber types.
RJ-45 (copper) ports, with N-way auto-negotiation

Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
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.
Standard (ports in front) or Reverse (ports in rear) rack mounting
The 4K24 is offered with ports and LEDs in the front, or in a “reverse”
package with LEDs in front and all Ethernet and power cables in the rear. As
a special feature of the 4K24 Reverse, LEDs are both front and rear. .
Standard 19’ rack mount brackets are included, while ETSI and 23” Telco are
optional.
Plug-and-Play installation for high performance switching
RFL 3000 4K24 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.
Standard AC power input, -48VDC, 24VDC, or 125VDC is available
Standard AC power input is IEC plug, auto-ranging for worldwide use. For
special applications, models with –48VDC, 24VDC, or 125VDC are available.
Dual source DC input can also be selected and configured on the –48VDC,
24VDC, and 125VDC input models.
Extended Temperature Operation
The RFL 3000 4K24 has been tested for operation at temperatures of –5’C to
55’C. NEBS-certified models have been tested to a greater range per
NEBS Level 3 requirements.
2.4 Applications
RFL 3000 4K24 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 4K24 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 via either optional fiber or twisted pair cabling, and may be 100Mbps or 10 Mbps
speed and full-or half-duplex mode. The 24-ports non-blocking switching capability of
RFL 3000 4K24’s support larger networks with multiple workgroups.
The mixed-media capability is ideal for upgrading existing Ethernet LAN
networks, where existing cabling must be accommodated. The fiber-built-in media
capability is ideal for integrating future-proof fiber cabling into the LAN structure.

Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
Example1: In a typical application, a Switch is needed to provide a Fast Ethernet
departmental backbone. The 4K24F consists of twenty-two high-speed LAN segments,
each operating over 100Mb full-duplex RJ-45 lines. In addition, two fiber backbone
segments interconnect with the network center. The Switch needs to provide high-speed
switching support for two central servers, for a 100Mb connection to a router, and to a
mix of 10 and 100Mbps local workgroups of over a dozen users, printers, etc.
The RFL 3000 4K24F, equipped with two 100Mb fiber ports and 22 RJ-45 10/100 ports,
provides an economical solution in a rack-mount box. No Media Converters are needed.
The two-port Fiber FKM can be selected to provide the 100Mbps fiber connector type
desired. FKMs with either multi-mode or single-mode fiber types are available. The fiber
interconnects provide switched ports for fiber distances with high bandwidth.
The requirement for connecting local devices over twisted pair cabling is handled
by the RFL 3000 4K24F with 22 RJ-45 ports.
Since 100Mb fiber Ethernet has severe distance limitations at half-duplex, it is
necessary in high speed backbones to operate fiber links in the full-duplex mode. Many
low-end switches that only have RJ-45 N-way 10/100Mb ports would need to have a
media converter on each fiber line. But many media converters do not support auto-
negotiation and would not enable the fiber backbone lines to operate full-duplex. But the
RFL 3000 4K24F . . . with the optional two switched fiber ports at 100Mb speed, with
full-duplex mode as a default setting on fiber ports, and with a large batch of RJ-45 N-
way 10/100Mb ports as well. . . handles this application readily.
Router
2X 4X 6 8 10 12 14 16 18 20 22 24
1 X 1 3 5 7 9 11 13 15 17 19 21 23
Magnum 4024F Switch
100M
Col/FDX
Link/Act
Power 100M
Col/FDX
Link/Act
TX X
TX RX
Tx Rx UPLINK
FH
= X
2SW
UPLINK 3 4 5 6 7 8
1SW
Magnum DS80F Dual Speed
Personal Hub
PORTS 1SW 2SW 3 4 5 6 7 8
Link/Act
Speed
F/H
Power
Error
Figure 2.4b: The RFL 3000 4K24F provides 10/100Mb speed with high bandwidth
and fiber interconnects for a departmental LAN
Example 2: In another situation for a small office, a central Switch is needed to provide
for a 24-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 3 ports are for future expansion.
GARRETT
12V, 1.5Am ps
10 10

Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
The RFL 3000 4K24 Switch fits nicely in this environment, and offers future
backbone expansion. The 24 switched copper ports are provfided by a RFL 3000 4K24.
Should the number of servers expand, more than one server can be accessed at full speed
from any switched 4K24 port by any of the users simultaneously.
Router
10 10
2 4X 6 8 10 12 14 16 18 20 22 24
1X 1 3X 5 7 9 11 13 15 17 19 21 23
Magnum 4016C Switch
100M
Col/FDX
Link/Act
Power 100M
Col/FDX
Link/Act
10
Fig 2.4c: RFL 3000 4K24 provides a 10/100Mb Switch with non-blocking
performance for small a office
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 500C.
2.) If the equipment is mounted in an enclosed or multiple rack assembly, adequate air
flow must be maintained for proper and safe operation.
3.) If the equipment is mounted in an enclosed or multiple rack system placement of
the equipment must not overload or load unevenly the rack system.
4.) If the equipment is mounted in an enclosed or multiple rack assembly, verify the
equipment’s power requirements to prevent overloading of the building/s electrical
circuits.
5.) If the equipment is mounted in an enclosed or multiple rack assembly verify that
the equipment has a reliable and uncompromised earthing path.
6.) If the intra-building wiring (cabling) is involved with this product(NEBS), then it
is recommended to have shielded cable and the shield is grounded at both ends.
Installation: This section describes installation of the RFL 3000 4K-Series Switches, as
well as connection of the various Ethernet media types.
3.1 Locating RFL 3000 4K24 Switches

Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
The location of a RFL 3000 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 RFL
3000 4K-Series site. The rugged metal case of the RFL 3000 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.
F
H
ON
OFF
110-220
VAC
47-63Hz
1.0-0.5A
Figure 3.1: Location of RFL 3000 4K24’s cooling fan exhaust
3.2 Connecting Ethernet Media
The RFL 3000 4K24 Switches are specifically designed to support all standard Ethernet
media types within a single Switch unit. This is accomplished by using a family of Fiber-
port Modules (FKMs) which can be individually selected and configured per-port. See
Section 2.4 for a description of the FKMs.
The various media types supported along with the corresponding IEEE 802.3 and 802.3u
standards and connector types are as follows:
IEEE Standard Media Type Max. Distance Port Module
Fiber:
100BASE-FX mm1Fiber 2.0km (6,562 ft) FKM-MST
mm1Fiber 2.0km (6,562 ft) FKM-MSC
mm1Fiber 2.0km (6,562 ft) FKM-MTRJ (SFF)
sgl.m
2Fiber 18.0km (95K ft) FKM-SSC
sgl.m
2Fiber 40.0km (12K ft) FKM-SSCL
Copper:
10BASE-T & 100BASE-TX twisted pair 100m (328 ft) RJ45
1mm = multi-mode 2sgl.m = single-mode
3.2.1 Connecting Fiber Optic ST-type, “twist-lock”
The following procedure applies to installations using a FKM with ST-type fiber
connectors. This procedure applies to ports using a FKM-MST or FKM10-MST.

Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
1. Before connecting the fiber optic cable, remove the protective dust caps from the
tips of the connectors on the FKM. Save these dust caps for future use.
2. Wipe clean the ends of the dual connectors with a soft cloth or lint-free lens tissue
dampened in alcohol. Make certain the connectors are clean before connecting.
Note: One strand of the duplex fiber optic cable is coded using color bands at
regular intervals; you must use the color-coded strand on the associated ports at
each end of the fiber optic segment.
3. Connect the Transmit (TX) port (light colored post) on the RFL 3000 FKM to the
Receive (RX) port of the remote device. Begin with the color-coded strand of
the cable for this first TX-to-RX connection.
4. Connect the Receive (RX) port (dark colored post on the PM) to the Transmit (TX)
port of the remote device. Use the non-color coded fiber strand for this.
5. The LINK LED on the front of the FKM will illuminate when a proper connection
has been established at both ends (and when power is ON in the unit). If LINK is
not lit after cable connection, the normal cause is improper cable polarity. Swap the
fiber cables at the FKM connector to remedy this situation.
3.2.2 Connecting Fiber Optic SC-type and MTRJ, "Snap-In"
The following procedure applies to installations using a FKM with SC-type and
MTRJ-type fiber connectors, i.e., using FKM-MSC, FKM-MTRJ, FKM-SSC and –SSCL
single-mode.
When connecting fiber media to SC or MTRJ connectors, simply remove (and
save) the dust cover plugs and snap on the two square male connectors into the SC female
jacks of the FPM until it clicks and secures.
3.2.3 Connecting Single-Mode Fiber Optic
When using single-mode fiber cable, be sure to use single-mode fiber port
connectors. Single-mode fiber cable has a smaller diameter than multi-mode fiber cable
(9/125 microns for single-mode, 50/125 or 62.5/125 microns for multi-mode where xx/xx
are the diameters of the core and the core plus the cladding respectively). Single-mode
fiber allows full bandwidth at longer distances than multi-mode, and may be used to
connect nodes or switched ports, to 20+Km distance with the FKM-SSC and 40+Km
with the “long reach” FKM-SSCL.
The same procedures as for multi-mode fiber applies to single-mode fiber
connectors. Follow the steps listed in Section 3.2.2 above.

Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
3.2.4 Connecting Twisted Pair (RJ-45,CAT3, CAT5, Unshielded or Shielded)
The RJ-45 ports of the RFL 3000 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 Rack-mounting
Installation of a RFL 3000 4K24 Switch in a 19” rack is a simple procedure. The
units are 1U (1.70”) high. When properly installed, the front-mounted LED status
indicators should be in plain view and easy to read. Rack-mount installation requires
special “19” rack-mounted brackets and screws (included with each 4K24 unit). The
brackets attach to the front sides of the Switch, which is then fastened into a standard 19”
RETMA rack.
2X 4X 6 8 10 12 14 16 18 20 22 24
1X 1 3 5 7 9 11 13 15 17 19 21 23
Magnum 4024F Switch
100M
Col/FDX
Link/Act
Power 100M
Col/FDX
Link/Act
TX X TX RX

Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
The 23” brackets and ETSI brackets are also available (optional) for Rack-mounting of
RFL 3000 4K Series Switches. The 23” brackets are popular in the Telco industry where
they are a standard for Central Office rack-mounting purposes. The 23” brackets are
mainly used for larger equipment assemblies in rack-mounting frames, and are frequently
accessed in operation from both sides.
The ETSI (European Telephone standard) brackets are similar to the 19”
brackets but use metric dimensions.
The optional 23” brackets and the ETSI brackets come as a pair in a package along with
the necessary screws for attaching the brackets to the sides of the RFL 3000 Switch unit.
2X 4X 6 8 10 12 14 16 18 20 22
1 X 1 3 5 7 9 11 13 15 17 19 21
RFL 3000 4024F
100
Col/FD
Link/Act
Powe 100
Col/FD
X
Link/Act
TX X TX RX
2X 4X 6 8 10 12 14 16 18 20 22
1 X 1 3 5 7 9 11 13 15 17 19 21
RFL 3000 4024F
100
Col/FD
X
Link/Ac
Powe 100
Col/FD
Link/Ac
TX X TX RX
2X 4X 6 8 10 12 14 16 18 20 22
1 X 1 3 5 7 9 11 13 15 17 19 21
RFL 3000 4024F
100
Col/FD
Link/Act
Powe 100
Col/FD
Link/Ac
TX X TX RX
2X 4X 6 8 10 12 14 16 18 20 22
1 X 1 3 5 7 9 11 13 15 17 19 21
RFL 3000 4024F
100
Col/FD
X
Link/Act
Powe 100
Col/FD
Link/Ac
TX X TX RX
Fig 3.3 Multiple RFL 3000 4K24 units rack-mounted in a 23” Rack-mount frame
3.4 Installing and Removing FKM Fiber Port Modules
STOP!!!
Be sure the power cord is unplugged
from the chassis before attempting to remove
and/or replace any FPM modules.
Failure to do so may result in damage to the unit
and may void the warranty.
-Caution- Avoid Static Discharge: The Fiber port modules (like most electronic
equipment) are sensitive to static discharge. Use proper ESD measures when
handling port modules.