Connector and Cable SpecificationsFastHub 412 models 1x through 12x 12

FastHub 424 models 1x through 24x 24A P P E N D I X B

Connector and Cable SpecificationsThis appendix provides connector and cable descriptions for the following ports on the hub:

10/100 network and uplink ports

Console port

This appendix also provides:

Ethernet and FastHub cabling guidelines

Cabling information for avoiding cabling problems in Token-Ring environments

10/100 PortsTable B-1 lists the 10/100 network and uplink ports on the FastHub 400 models.

Table B-1 FastHub 10/100 Ports

Model Network Ports Uplink PortB-1

10/100 PortsThe 10/100 network ports and 10/100 uplink port use standard RJ-45 connectors. Table B-2 lists the pinouts for these ports.

Network PortsThe 10/100 network ports are internally crossed (shown with an X next to each port number). Use an Ethernet crossover cable to connect these ports to other network devices, such as switches or other hubs. Use a straight-through cable to connect these ports to workstations, servers, or routers. Use the following types of cable, appropriately:

10-Mbps network devicesCategory 3, 4, or 5 cable

100-Mbps network devicesCategory 5 cable

Caution When cabling an Ethernet network that contains autosensing 10/100 repeaters like the FastHub 400 series, use caution when using Category 3 and Category 4 cable. These cable types do not support 100BaseTX networks.

Note Use a straight-through cable to connect two ports when one of the ports is designated with an X. Use a crossover cable to connect two ports when both ports are designated with an X.

Table B-2 10/100 Port Connector Pinouts

Pin Signal1 RD+

2 RD-

3 TD+

4 NC

5 NC

6 TD-

7 NC

8 NCFastHub 400 10/100 Series Installation and Configuration GuideB-2

Uplink PortUplink PortThe 10/100 uplink port is not internally crossed. Use an Ethernet crossover cable to connect this port to other network devices, such as workstations, servers, or routers. Use a straight-through cable to connect this port to switches or other hubs. Use the following types of cable, appropriately:

10-Mbps network devicesCategory 3, 4, or 5 cable

100-Mbps network devicesCategory 5 cable

Caution When cabling an Ethernet network that contains autosensing 10/100 repeaters like the FastHub 400 series, use caution when using Category 3 and Category 4 cable. These cable types do not support 100BaseTX networks.

Note Use a straight-through cable to connect two ports when one of the ports is designated with an X. Use a crossover cable to connect two ports when both ports are designated with an X.

Caution If you connect to both port 12x and 12 (or port 24x and 24), you will disable both ports. Connector and Cable Specifications B-3

10/100 PortsEthernet Cable SchematicsFigure B-1 is a schematic of the types of cable (straight-through and crossover) used to connect the hub to network devices.

Figure B-1 Ethernet Cable Schematics

CrossoverStraight-Through

H54

62

Hub Adapter

3 TD+ 3 RD+

6 TD- 6 RD-

1 RD+ 1 TD+

2 RD- 2 TD-

Hub Hub

3 TD+ 3 TD+

6 TD- 6 TD-

1 RD+ 1 RD+

2 RD- 2 RD-FastHub 400 10/100 Series Installation and Configuration GuideB-4

Console PortConsole PortThe console port uses an 8-pin RJ-45 connector, as shown in Figure B-1. The supplied RJ-45-to-RJ-45 rollover console cable and adapter are used to connect the console port of the hub to a management station or modem. The following sections describe the supplied rollover console cable and adapter for the console port.

Identifying a Rollover CableYou can identify a rollover cable by comparing the two modular ends of the cable. Hold the cable ends side-by-side, with the tab at the back. The wire connected to the pin on the outside of the left plug should be the same color as the wire connected to the pin on the outside of the right plug (see Figure B-2).

Figure B-2 Identifying a Rollover Cable

Pin 1

H10

632

Pin 8

Pin 1 on one connector and pin 8 on the other connectorshould be the same color. Connector and Cable Specifications B-5

Console PortConnecting to a PCUse the thin, flat, RJ-45-to-RJ-45 rollover console cable and RJ-45-to-DB-9 female DTE adapter (labeled TERMINAL) to connect the hub console port to a PC running terminal emulation software. Figure B-3 shows how to connect the console port to a PC. Table B-3 lists the pin assignments for the console port, the RJ-45-to-RJ-45 rollover cable, and the RJ-45-to-DB-9 female DTE adapter (labeled TERMINAL).

Figure B-3 Connecting the Console Port to a PC

Table B-3 Console Port Signaling and Cabling Using a DB-9 Adapter

ConsolePort (DTE)

RJ-45-to-RJ-45 Rollover Cable

RJ-45-to-DB-9Terminal Adapter

ConsoleDevice

Signal RJ-45 Pin RJ-45 Pin DB-9 Pin SignalRTS 11

1 Pin 1 is connected (inside the terminal adapter) to Pin 8.

8 8 CTS

DTR 2 7 6 DSR

TxD 3 6 2 RxD

GND 4 5 5 GND

GND 5 4 5 GND

RxD 6 3 3 TxD

DSR 7 2 4 DTR

CTS 81 1 7 RTS

PC

1451

1

RJ-45-to-RJ-45rollover cable

RJ-45-to-DB-9 adapter (labeled TERMINAL)

FastHub 400M modelsFastHub 400 10/100 Series Installation and Configuration GuideB-6

Ethernet and FastHub Cabling GuidelinesEthernet and FastHub Cabling GuidelinesThis section provides cabling guidelines for building networks using the FastHub 400 series and other repeaters.

Repeater TypesThe IEEE 802.3u standard defines two different classes of Ethernet repeaters, Class I and Class II.

The FastHub 400 series are Class II repeaters with the following advantages:

Class II repeaters support two repeaters for building a single network. (Class I repeaters limit a network to one repeater.)

Class II repeaters support longer cable segments in single repeater configurations than Class I repeaters.

Switches with Internal RepeatersMany switches have internal repeaters or plug-in repeater modules. In this type of device, the switch is actually attached to a port on the internal repeater. When connecting the hub to a switch, find out whether the port you are connecting to is a repeater port, and then take one of the following steps:

If it is not a repeater port, the switch acts as an ordinary end-station, and you do not have to take any special steps.

If the port is a Class I repeater port, do not connect the FastHub 400 series or any other repeater to the port. Connector and Cable Specifications B-7

Ethernet and FastHub Cabling GuidelinesGeneral Guidelines for Ethernet NetworksTable B-4 describes some guidelines when creating Ethernet networks with multiple repeaters. Exact figures could vary, depending on the manufacturer of the network equipment.

FastHub Example ConfigurationsThe IEEE 802.3u standard specifies network configurations using Class II repeaters. These configurations were designed to satisfy the requirements of most networks that are built to the EIA/TIA-568 wiring standard. This standard specifies 100-meter Category 5 connections from wiring closets to desktops.

Note In any configuration, the maximum Category 5 cable length is 100 meters. Longer segment lengths are possible only when using multimode fiber-optic cable (hereafter referred to as fiber cable).

Note In the following configurations, each FastHub model can be a single unit or a FastHub stack.

Table B-4 10BaseT and 100BaseTX Guidelines

Specification 10BaseT 100BaseTXMaximum segment length 100 meters 100 meters

Maximum number of segments per network 5 Class II2 Class I1

Maximum number of hops1

1 Hops = other repeaters.

4 Class II1 Class Inone

Maximum number of stations per segment 1024 1024

Cable type supported Category 3, 4, or 5 Category 5FastHub 400 10/100 Series Installation and Configuration GuideB-8

FastHub Example ConfigurationsSingle FastHub Unit with Category 5 Cable SegmentsWith only Category 5 cable segments, the maximum length for any cable segment is 100 meters, as shown in Figure B-4.

Figure B-4 Single FastHub Unit with Category 5 Cable Segments

SYSTEM RPS

10010010

UTL

MODE

1x 2x 3x 4x 5x 6x 7x 8x 249x 10x 11x 12x 13x 14x 15x 16x 17x 18x 19x 20x 22x 23x 24x21x

10BaseT/100BaseTx

100 metersmaximum

Category 5 straight-through cable 1570

5 Connector and Cable Specifications B-9

Ethernet and FastHub Cabling GuidelinesSingle FastHub Unit with Category 5 Segments and One Fiber-Cable SegmentThe example in Figure B-5 shows the hub connected to stations through its 10/100 ports and the optional 100BaseFX module port. The hub is also connected to a server through its 100BaseFX switched uplink module port. The maximum Category 5 cable segment length is 100 meters. The maximum fiber-cable segment length is 412 meters if the link is operating in half-duplex mode (2 kilometers in full duplex).If all Category 5 cable segments connected to the FastHub unit are less than 100 meters, the length of the fiber-cable segment can be increased.

Figure B-5 Single FastHub Unit with Category 5 Segments and One Fiber-Cable Segment

10010010

UTL

SYSTEM RPS

MODE

1x 2x 3x 4x 5x 6x 7x 8x 249x 10x 11x 12x 13x 14x 15x 16x 17x 18x 19x 20x 22x 23x 24x21x

10BaseT/100BaseTx

100 metersmaximumsegment

2 kilometersmaximum

1567

1Category 5 straight-through cableMultimode fiber-optic cableFastHub 400 10/100 Series Installation and Configuration GuideB-10

FastHub Example ConfigurationsTwo FastHub Units with Category 5 Cable SegmentsThe maximum Category 5 cable segment length is 100 meters. When stations are connected to the FastHub units with 100-meter cable segments, the cable connecting the two FastHub units is limited to a distance of 5 meters, as shown in Figure B-6.

If all of the cable segments connecting stations to one or both of the FastHub units are less than 100 meters, the length of the cable segment connecting the two FastHub units can be increased.

Figure B-6 Two FastHub Units with Category 5 Cable Segments

10010010

UTL

SYSTEM RPS

MODE

1x 2x 3x 4x 5x 6x 7x 8x 249x 10x 11x 12x 13x 14x 15x 16x 17x 18x 19x 20x 22x 23x 24x21x

10BaseT/100BaseTx

10010010

UTL

SYSTEM RPS

MODE

1x 2x 3x 4x 5x 6x 7x 8x 249x 10x 11x 12x 13x 14x 15x 16x 17x 18x 19x 20x 22x 23x 24x21x

10BaseT/100BaseTx

5 meters100 metersmaximumsegment

100 metersmaximum

1570

6

Category 5 straight-through cable Connector and Cable Specifications B-11

Ethernet and FastHub Cabling GuidelinesIncreasing the Distance Between Two FastHub Units By Reducing Maximum Cable Segments

You can increase the distance between two FastHub units by reducing the maximum cable segments connecting them to stations. The maximum Category 5 equivalent distance between any two stations separated by two FastHub units is 205 meters.

In the following example, you need to separate the two repeaters by 60 meters (see Figure B-7). Using A + B + C = 205 meters and substituting 60 meters for segment B, we arrive at A + C 145 meters. Neither segment A or C can be greater than 100 meters.

Figure B-7 Increasing the Distance Between Two FastHub Units

10010010

UTL

SYSTEM RPS

MODE

1x 2x 3x 4x 5x 6x 7x 8x 249x 10x 11x 12x 13x 14x 15x 16x 17x 18x 19x 20x 22x 23x 24x21x

10BaseT/100BaseTx

10010010

UTL

SYSTEM RPS

MODE

1x 2x 3x 4x 5x 6x 7x 8x 249x 10x 11x 12x 13x 14x 15x 16x 17x 18x 19x 20x 22x 23x 24x21x

10BaseT/100BaseTx

10010010

UTL

SYSTEM RPS

MODE

1x 2x 3x 4x 5x 6x 7x 8x 249x 10x 11x 12x 13x 14x 15x 16x 17x 18x 19x 20x 22x 23x 24x21x

10BaseT/100BaseTx

10010010

UTL

SYSTEM RPS

MODE

1x 2x 3x 4x 5x 6x 7x 8x 249x 10x 11x 12x 13x 14x 15x 16x 17x 18x 19x 20x 22x 23x 24x21x

10BaseT/100BaseTx

10010010

UTL

SYSTEM RPS

MODE

1x 2x 3x 4x 5x 6x 7x 8x 249x 10x 11x 12x 13x 14x 15x 16x 17x 18x 19x 20x 22x 23x 24x21x

10BaseT/100BaseTx

FastHubFastHub stack

A

B

C

1621

3

Category 5 straight-through cable

A + B + C 205 metersWhere A is longest segment connected to stations on FastHub 1Where B is longest segment connected to stations on FastHub 2

Multimode fiber-optic cableFastHub 400 10/100 Series Installation and Configuration GuideB-12

FastHub Example ConfigurationsIncreasing the Distance Between Two FastHub Units by Connections through Switched Uplink Modules

You can increase the distance between two FastHub units by connecting them through their switched uplink modules (10BaseT/100BaseTX or 100BaseFX). As shown in Figure B-8, the maximum length for segment B is 100 meters for Category 5 and 412 meters for fiber in half-duplex mode (2 kilometers in full duplex). Segments A and C can be no greater than 100 meters.

Figure B-8 Increasing the Distance Between Two FastHub Units

10010010

UTL

SYSTEM RPS

MODE

1x 2x 3x 4x 5x 6x 7x 8x 249x 10x 11x 12x 13x 14x 15x 16x 17x 18x 19x 20x 22x 23x 24x21x

10BaseT/100BaseTx

10010010

UTL

SYSTEM RPS

MODE

1x 2x 3x 4x 5x 6x 7x 8x 249x 10x 11x 12x 13x 14x 15x 16x 17x 18x 19x 20x 22x 23x 24x21x

10BaseT/100BaseTx

FastHubFastHub

A

B

C

1760

8Category 5 straight-through cable

A + B + C 205 metersWhere A is longest segment connected to stations on FastHub 1Where B is longest segment connected to stations on FastHub 2

Multimode fiber-optic cable Connector and Cable Specifications B-13

Avoiding Cabling Problems in Token-Ring EnvironmentsAvoiding Cabling Problems in Token-Ring EnvironmentsShielded twisted-pair cable is the most commonly used cable in Token-Ring environments. The media interface connectors (MICs) and balunsused to connect shielded twisted-pair and unshielded twisted-pair cablingcreate a loopback when they are disconnected; the loopback might cause anomalies with the hub.

To prevent loopback problems when using shielded twisted-pair cabling in a Token-Ring network environment, make sure the MICs and baluns are never left unconnected when they are part of a link connected to the hub (see Figure B-9).

Figure B-9 Shielded Twisted-Pair Cable Connections

10010010

UTL

SYSTEM RPS

MODE

1x 2x 3x 4x 5x 6x 7x 8x 249x 10x 11x 12x 13x 14x 15x 16x 17x 18x 19x 20x 22x 23x 24x21x

10BaseT/100BaseTx

10010010

UTL

SYSTEM RPS

MODE

1x 2x 3x 4x 5x 6x 7x 8x 249x 10x 11x 12x 13x 14x 15x 16x 17x 18x 19x 20x 22x 23x 24x21x

10BaseT/100BaseTx

UTP

Ethernetcable

Ethernetcable

Ethernetcable

MIC/BalunMIC/Balun

Foil twisted-pair cable

Incorrect

UTPCorrect

Correct (no connection)

MIC/BalunMIC/Balun

UTP

MIC/BalunMIC/Balun 1451

6

Foil twisted-pair cable

Foil twisted-pair cable100

10010UTL

SYSTEM RPS

MODE

1x 2x 3x 4x 5x 6x 7x 8x 249x 10x 11x 12x 13x 14x 15x 16x 17x 18x 19x 20x 22x 23x 24x21x

10BaseT/100BaseTxFastHub 400 10/100 Series Installation and Configuration GuideB-14

Single FastHub Unit with Category 5 Cable SegmentsSingle FastHub Unit with Category 5 Segments and One Fiber-Cable SegmentTwo FastHub Units with Category 5 Cable SegmentsIncreasing the Distance Between Two FastHub Units By Reducing Maximum Cable SegmentsIncreasing the Distance Between Two FastHub Units by Connections through Switched Uplink Modules

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