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724-746-5500   |   blackbox.com 

Page 30

LGB1108A Quick Start Guide

724-746-5500   |   blackbox.com 

Chapter 9: Cabling

Straight-Through Wiring

If the twisted-pair cable is to join two ports and only one of the ports has an internal crossover (MDI-X), the two pairs of wires 
must be straight-through. (When auto-negotiation is enabled for any RJ-45 port on this switch, you can use either straight-
through or crossover cable to connect to any device type.)

You must connect all four wire pairs as shown in the following diagram to support Gigabit Ethernet.

Figure 9-2. Straight-through wiring: EIA/TIA 586B RJ-45 wiring standard 10BASE-TX / 100BASE-T straight-through cable.

Crossover Wiring

If the twisted-pair cable is to join two ports and either both ports are labeled with an “X” (MDI-X) or neither port is labeled with 
an “X” (MDI), a crossover must be implemented in the wiring. (When autonegotiation is enabled for any RJ-45 port on this 
switch, you can use either straight-through or crossover cable to connect to any device type.)

You must connect all four wire pairs as shown in the following diagram to support Gigabit Ethernet.

Figure 9-3. Crossover wiring: EIA/TIA 586B RJ-45 wiring standard 10BASE-TX / 100BASE-T crossover cable.

1000BASE-T Pin Assignments

All 1000BASE-T ports support automatic MDI/MDI-X operation, so you can use straight-through cables for all network  
connections to PCs or servers, or to other switches or hubs. The table below shows the 1000BASE-T MDI and MDI-X port  
pinouts. These ports require that all four pairs of wires be connected. Note that for 1000BASE-T operation, all four pairs of wires 
are used for both transmit and receive. Use 100-ohm Category 5, 5e or 6 unshielded twisted-pair (UTP) or shielded twisted-pair 
(STP) cable for 1000BASE-T connections. Also be sure that the length of any twisted-pair connection does not exceed 100 meters 
(328 feet).

Summary of Contents for LGB1108A

Page 1: ...Gigabit Managed Switch LGB1108A LGB1126A LGB1148A Order toll free in the U S Call 877 877 BBOX outside U S call 724 746 5500 FREE technical support 24 hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746 Mailing address Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com Customer Support Information ...

Page 2: ...click on Talk to Black Box You ll be live with one of our technical experts in less than 30 seconds Trademarks Used in this Manual Black Box and the Double Diamond logo are registered trademarks of BB Technologies Inc Intel is a registered trademark of Intel Corporation Xerox is a registered trademark of Xerox Corporation Any other trademarks mentioned in this manual are acknowledged to be the pro...

Page 3: ...ence when the equipment is operated in a commercial environment Operation of this equipment in a residential area is likely to cause interference in which case the user at his own expense will be required to take whatever measures may be necessary to correct the interference Changes or modifications not expressly approved by the party responsible for compliance could void the user s authority to o...

Page 4: ...tes que impidan el flujo de aire por los orificios de ventilación 10 El equipo eléctrico deber ser situado fuera del alcance de fuentes de calor como radiadores registros de calor estufas u otros aparatos incluyendo amplificadores que producen calor 11 El aparato eléctrico deberá ser connectado a una fuente de poder sólo del tipo descrito en el instructivo de operación o como se indique en el apar...

Page 5: ... of Hardware 9 3 Network Planning 11 3 1 Introduction to Switching 11 3 2 Application Examples 11 4 Installation 13 4 1 Selecting a Site 13 4 2 Ethernet Cabling 13 4 3 Equipment Checklist 13 4 4 What s Included 14 4 5 Mounting Instructions 14 5 Network Connections 21 5 1 Connecting Network Devices 21 5 2 Twisted Pair Devices 21 6 Labeling Connections 25 7 Troubleshooting 26 8 Power and Cooling Pro...

Page 6: ... or 6 Ports LGB1108A 8 10 100 1000 Mbps TP 2 100 1000 Mbps SFP Fiber 10 100 1000 Mbps TP dual media ports 1 RJ 45 console port LGB1126A 20 10 100 1000 Mbps TP 4 100 1000 Mbps SFP Fiber 10 100 1000 Mbps TP dual media ports 2 10 1000M SFP ports 1 RJ 45 console port LGB1148A 44 10 100 1000 Mbps TP 4 100 1000 Mbps SFP Fiber 10 100 1000 Mbps TP dual media ports 1 DB9 console port Switching Database 8K ...

Page 7: ...ed pair copper IEEE 802 3z 1000BASE X Ethernet IEEE 802 3x flow control capability ANSI IEEE 802 3 autonegotiation IEEE 802 1Q VLAN IEEE 802 1p Class of service IEEE 802 1X Access control IEEE 802 1D Spanning tree IEEE 802 1w Rapid spanning tree IEEE 802 1s Multiple spanning tree IEEE 802 3ad Link aggregation control protocol LACP IEEE 802 1AB Link layer discovery protocol LLDP 1 5 Compliances Com...

Page 8: ...witch TP LEDs and 1 RJ 45 console port The LGB1126A has 20 10 100 1000BASE T RJ 45 ports 4 dual media UTP SFP ports 2 SFP ports 40 switch TP LEDs and 1 RJ 45 console port The LGB1148A has 44 10 100 1000BASE T RJ 45 ports 4 dual media UTP SFP ports 88 switch TP LEDs and 1 DB9 console port 2 2 Features Switch Architecture This switch performs a wire speed non blocking switching fabric which enables ...

Page 9: ...ared with RJ 45 ports 21 24 and 2 additional SFP ports The LGB1148A 48 Port Gigabit Managed Switch has 4 dual media UTP SFP ports Ports 45 48 The following table shows a list of transceiver types that have been tested with the switch For an updated list of vendors supplying these transceivers contact your local dealer For information on the recommended standards for fiber optic cabling see 1000 Mb...

Page 10: ...ED Conditions Status TP Link ACT Green Lit Green when TP link is good blinks when any traffic is present TP Speed Green Lit Green when the TP link is on 1000 Mbps Blinks when the TP link is on 100 Mbps Off when the TP link is on 10 Mbps SFP Link ACT Green Amber Lit Green when the SFP link is on 1000 Mbps Lit Amber when the SFP link is on 100 Mbps Blinks when any traffic is present Table 2 3 System...

Page 11: ...hernet or Gigabit Ethernet network to significantly increase bandwidth while using conventional cabling and network cards 3 2 Application Examples The Gigabit Managed Switch uses 8 20 or 44 Gigabit Ethernet TP ports with Auto MDI X and two slots for the removable SFP module which supports a number of types of fiber connections including LC and BiDi LC modules It is not only designed to segment you...

Page 12: ...46 5500 blackbox com Page 12 LGB1108A Quick Start Guide Chapter 3 Network Planning LGB1108A Figure 3 2 Peer to peer network connection LGB1108A LGB1108A Figure 3 3 Office network connection LGB1108A Internet ...

Page 13: ...es 100 to 240 VAC 50 to 60 Hz 4 2 Ethernet Cabling To ensure proper operation when installing the switch in a network make sure that the current cables are suitable for 100BASE TX or 1000BASE T operation Check the following criteria against the current installation of your network Cable type Unshielded twisted pair UTP or shielded twisted pair STP cable with RJ 45 connectors Category 5 or Category...

Page 14: ... port 4 5 Mounting Instructions The switch can be mounted in a standard 19 inch equipment rack or on a desktop or shelf Rackmounting Before rackmounting the switch check the following Temperature Since the temperature within a rack assembly may be higher than the ambient room temperature check that the rack environment temperature is within the specified operating temperature range 32 to 104 F 0 t...

Page 15: ...in this chapter Step 4 If installing multiple switches mount them in the rack one below the other in any order Desktop or Shelf Mounting Step 1 Attach the four adhesive rubber feet to the bottom of the first switch Figure 4 5 Attaching the adhesive rubber feet Step 2 Set the device on a flat surface near an AC power source making sure there are at least two inches of space on all sides for proper ...

Page 16: ...ication 1000BASE SX GE SFP Fiber Module LC Multimode 850 nm 1000BASE SX GE SFP Fiber Module LC Multimode 1310 nm 2 km 1000BASE LX GE SFP Fiber Module LC Single Mode 10 km 1000BASE LX GE SFP Fiber Module LC Single Mode 30 km 1000BASE LX GE SFP Fiber Module LC Single Mode 50 km 1000BASE LX GE SFP Fiber Module LC Single Mode 50 km 1000BASE LX GE SFP Fiber Module Bidi LC Single Mode 10 km 1310 nm 1000...

Page 17: ...power cable You must use a power cable set that has been approved for the socket type in your country Connecting to the Console Port The RJ 45 serial port on the switch s front panel is used to connect to the switch for out of band console configuration The command line driven configuration program can be accessed from a terminal or a PC running a terminal emulation program The pin assignments use...

Page 18: ...s Default baud rate 115 200 bps Character size 8 characters Parity None Stop bit One Data bits 8 Flow control none Using Web based Management The default values of the managed switch are listed in the table below Table 4 3 Using Web based Management IP Address 192 168 1 1 Subnet Mask 255 255 255 0 Default 192 168 1 254 Username admin Password ...

Page 19: ...will show the following screen and ask you to log in When you log in the first time the default username is admin and the password field remains blank Figure 4 9 Web User Interface screen NOTE If you need to configure the function or parameter refer to the detail in the User Guide Or access the switch and click help under the Web GUI A help screen will provide you with help content to walk you thr...

Page 20: ...724 746 5500 blackbox com Page 20 LGB1108A Quick Start Guide Chapter 4 Installation Figure 4 11 System Information Help screen ...

Page 21: ...the device is a network card and the switch is in the wiring closet attach the other end of the cable segment to a modular wall outlet that is connected to the wiring closet See the next section Network Wiring Connections Otherwise attach the other end to an available port on the switch Make sure each twisted pair cable does not exceed 328 ft 100 meters in length NOTE Avoid using flow control on a...

Page 22: ...e The lasers are inherently eye safe in normal operation However users should never look directly at a transmit port when it is powered on Step 1 Remove and keep the LC port s rubber plug When not connected to a fiber cable the rubber plug should be replaced to protect the optics Step 2 Check that the fiber terminators are clean You can clean the cable plugs by wiping them gently with a clean tiss...

Page 23: ...eparate collision domains you should not include the switch or connected cabling in your calculations for cascade length involving other devices 1000BASE T Cable Requirements All Category 5 UTP cables that are used for 100BASE TX connections should also work for 1000BASE T providing that all four wire pairs are connected However it is recommended that for all critical connections or any new cable ...

Page 24: ...00 m 1641 ft 550 m 1805 ft LC LC Table 5 3 Maximum 1000BASE LX LHX XD ZX Gigabit fiber cable lengths Fiber Size Fiber Bandwidth Maximum Cable Length Connector 9 125 micron single mode fiber 1310 nm n a 10 km 6 2 miles LC 9 125 micron single mode fiber 1550 nm n a 30 km 18 6 miles 50 km 31 1 miles LC LC Table 5 4 Maximum 1000BASE SX Gigabit fiber cable lengths Fiber Size Fiber Bandwidth Maximum Cab...

Page 25: ...bel the opposing ends of each cable Using your building s floor plans draw a map of the location of all network connected equipment For each piece of equipment identify the devices to which it is connected Note the length of each cable and the maximum cable length supported by the switch ports To make your labels easy to understand use a location based key when assigning prefixes to your cable lab...

Page 26: ...re all devices connected to the 10 26 or 48 Port Gigabit Managed Switch are configured to auto negotiate or are configured to connect at half duplex all hubs are configured this way for example Faulty or Loose Cables Look for loose or obviously faulty connections If they appear to be OK make sure the connections are snug If that does not correct the problem try a different cable Non Standard Cable...

Page 27: ... Verify that the switch and attached device are powered on Be sure the cable is plugged into the switch and corresponding device If the switch is installed in a rack check the connections to the punchdown block and patch panel Verify that the proper cable type is used and that its length does not exceed specified limits Check the adapter on the attached device and cable connections for possible de...

Page 28: ...ernate environment where you are sure that all the other components are functioning properly 8 2 In band Access You can access the management agent in the switch from anywhere within the attached network using Telnet or a Web browser However you must first configure the switch with a valid IP address subnet mask and default gateway If you have trouble establishing a link to the management agent ch...

Page 29: ...ts Use unshielded twisted pair UTP or shielded twisted pair STP cable for RJ 45 connections 100 ohm Category 3 or better cable for 10 Mbps connections or 100 ohm Category 5 or better cable for 100 Mbps connections Also be sure that the length of any twisted pair connection does not exceed 100 meters 328 feet The RJ 45 ports on the switch base unit support automatic MDI MDI X operation so you can u...

Page 30: ...ed in the wiring When autonegotiation is enabled for any RJ 45 port on this switch you can use either straight through or crossover cable to connect to any device type You must connect all four wire pairs as shown in the following diagram to support Gigabit Ethernet Figure 9 3 Crossover wiring EIA TIA 586B RJ 45 wiring standard 10BASE TX 100BASE T crossover cable 1000BASE T Pin Assignments All 100...

Page 31: ...abling must pass tests for Attenuation Near End Crosstalk NEXT and Far End Crosstalk FEXT This cable testing information is specified in the ANSI TIA EIA TSB 67 standard Additionally cables must also pass test parameters for Return Loss and Equal Level Far End Crosstalk ELFEXT These tests are specified in the ANSI TIA EIA TSB 95 Bulletin The Additional Transmission Performance Guidelines for 100 O...

Page 32: ...dispersion shifted fiber single mode 9 125 micron core Longer spans and extended reach Optimized for wavelength division multiplexing WDM transmission across wavelengths from 1285 to 1625 nm The zero dispersion wavelength is in the 1310 nm region G 653 Dispersion shifted fiber single mode 9 125 micron core Longer spans and extended reach Optimized for operation in the region from 1500 to 1600 nm G...

Page 33: ... Ethernet A network communication system developed and standardized by DEC Intel and Xerox using baseband transmission CSMA CD access logical bus topology and coaxial cable The successor IEEE 802 3 standard provides for integration into the OSI model and extends the physical layer and media with repeaters and implementations that operate on fiber Thin coax and twisted pair cable Fast Ethernet A 10...

Page 34: ...nnector for twisted pair wiring Switched Ports Ports that are on separate collision domains or LAN segments TIA Telecommunications Industry Association Transmission Control Protocol Internet Protocol TCP IP Protocol suite that includes TCP as the primary transport protocol and IP as the network layer protocol User Datagram Protocol UDP UDP provides a datagram mode for the packet switched communica...

Page 35: ...724 746 5500 blackbox com Page 35 LGB1108A Quick Start Guide Notes ...

Page 36: ... and power and surge protection products to media converters and Ethernet switches all supported by free live 24 7 Tech support available in 30 seconds or less Copyright 2012 Black Box Corporation All rights reserved Black Box Tech Support FREE Live 24 7 Tech support the way it should be Great tech support is just 30 seconds away at 724 746 5500 or blackbox com LGB1108A Quick Start Guide Rev 1 ...

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