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Ethernet Media

4-12

Cabling Types

Crossovers

The 10BASE-T and 100BASE-TX specifications require that some UTP connections
be crossed over. Crossing over is the reversal of the transmit and receive pairs at
opposite ends of a single cable. Each cable that swaps the location of the transmit
and receive pairs at only one end is called a crossover cable. Those cables that
maintain the same pin numbers for transmit and receive pairs at both ends are
called straight-through cables.

The 10BASE-T and 100BASE-TX specifications are designed around connections
from networking hardware to end user stations being made through
straight-through cabling. Because of this, the transmit wires of a networking
device such as a standalone hub or repeater connect to the receive pins of a
10BASE-T or 100BASE-TX end station.

If two similarly-designed network devices are connected using a straight-through
cable, the transmit pins of one device are connected to the transmit pins of the
other device. In effect, the two devices will both attempt to transmit on the same
pair of the cable between them.

To overcome this, a crossover must be placed between two like devices on a
network, forcing the transmit pins of one device to connect to the receive pins of
the other device. When two like devices are being connected to one another using
UTP cabling, an odd number of crossover cables, preferably one, must be part of
the cabling between them.

Figure 4-6. Straight-Through vs. Crossover Cables

Tx+

Tx-

Rx-

Rx+

Tx+

Tx-

Rx-

Rx+

Path of Transmission

Path of Transmission

Crossover

Straight-Through

Tx+

Tx-

Rx-

Rx+

Tx+

Tx-

Rx-

Rx+

1845n06

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Содержание 100BASE-FX

Страница 1: ...Cabletron Systems Cabling Guide...

Страница 2: ......

Страница 3: ...HAS BEEN ADVISED OF KNOWN OR SHOULD HAVE KNOWN THE POSSIBILITY OF SUCH DAMAGES Copyright 1996 by Cabletron Systems Inc All rights reserved Printed in the United States of America Order Number 9031845...

Страница 4: ...Notice ii...

Страница 5: ...s 2 1 Media 2 1 Cable 2 1 Wire 2 2 Connector 2 3 Port 2 6 Test Characteristics 2 6 Chapter 3 Relevant Specifications EIA TIA 3 1 Universal Service Order Code USOC 3 2 National Electrical Code NEC 3 2...

Страница 6: ...IRL Single Mode 5 6 Cable Type 5 6 Attenuation 5 6 Insertion Loss 5 7 Delay 5 7 Length 5 7 10BASE2 5 8 Cable Type 5 8 Termination 5 8 Connectors Taps 5 8 Grounding 5 9 Length 5 9 10BASE5 Coaxial Cable...

Страница 7: ...7 Delay 6 7 Length 6 7 Chapter 7 Fast Ethernet Network Requirements 100BASE TX 7 1 Cable Type 7 1 Insertion Loss Attenuation 7 2 Impedance 7 2 Jitter 7 2 Delay 7 3 Crosstalk 7 3 Noise 7 3 Other Consid...

Страница 8: ...Token Ring Media Cabling Types 9 1 Shielded Twisted Pair STP 9 1 Unshielded Twisted Pair UTP 9 5 Fiber Optics 9 8 Connector Types 9 10 STP 9 10 Unshielded Twisted Pair Cable 9 15 Fiber Optics 9 17 Ch...

Страница 9: ...ded Twisted Pair STP 11 5 STP Cable Quality 11 7 Fiber Optics 11 8 Connector Types 11 11 UTP 11 11 STP 11 12 Fiber Optics 11 13 Chapter 12 FDDI Network Requirements MMF PMD 12 1 Cable Type 12 1 Attenu...

Страница 10: ...D Rings 13 10 J Hooks 13 11 Strain Relief Bracket 13 11 Innerduct 13 12 Latching Duct 13 12 Raceway 13 13 Labeling Tape 13 13 Ty Wraps and Adhesive Anchors 13 14 Chapter 14 Connecting and Terminating...

Страница 11: ...d cables The information presented in the initial sections is essential to a complete understanding of the material that is presented in later sections Following the introductory material detailed exa...

Страница 12: ...thernet networks intended to operate in full duplex mode Chapter 7 Fast Ethernet Network Requirements deals with the cable characteristics and requirements of the Fast Ethernet networking technology i...

Страница 13: ...thin this document are printed in boldface type References to other Cabletron Systems publications or documents are printed in italic type NOTE Note symbol Calls the reader s attention to any item of...

Страница 14: ...tance or a network installation plan from the Networking Services group contact your Cabletron Systems Sales Representative In addition to the availability of Networking Services the Cabletron Systems...

Страница 15: ...all fiber optic cable types such as single or multimode fiber optics Cable The term cable as used in this document indicates either a specific type of transmission media i e multimode fiber optic cab...

Страница 16: ...able management devices such as wallplates patch panels and punchdown blocks between the two devices When a specific type of cabling is referred to when identifying a cable run the term refers only to...

Страница 17: ...een that protects the core or strands of the cable from interference from outside electrical influences The shield is wrapped around the core and is separated from the core by a layer of insulator Gau...

Страница 18: ...e it is connected to Pins may be fully exposed for insertion into a channel or partially exposed for connection to a contact Fully exposed pins will protrude from a housing or insulator Partially expo...

Страница 19: ...made between one male connector and one female connector The connectors themselves will not allow male male or female female connections Some connectors are genderless or hermaphroditic These are con...

Страница 20: ...on of current Impedance is measured in ohms Cables with high Impedance values are highly resistant to the transmission of electrical signals Some network operation specifications and network devices r...

Страница 21: ...al or optical impulse traveling through the cable The effect of attenuation is a gradual decrease in the power or clarity of a signal after it traverses a length of cabling The measure of the attenuat...

Страница 22: ...Cabling Terms 2 8 Test Characteristics...

Страница 23: ...is document Some of the aspects treated by the higher level specifications are discussed in the sections which follow as they impact or affect the use or selection of cabling materials in certain faci...

Страница 24: ...y Association Universal Service Order Code USOC The USOC specification is similar to many EIA TIA specifications including EIA TIA 568 The USOC specification describes among other things the construct...

Страница 25: ...cable should be used for no other purpose AUI cable is available in two basic types standard AUI and office AUI AUI cable is made up of four individually shielded pairs of wire surrounded by an overa...

Страница 26: ...will not function Likewise two AUI device ports should never be directly attached without using transceivers Standard The gauge of the internal wires that make up the cable determines the thickness an...

Страница 27: ...wo cable types that can support network operation using only one strand of cabling with a shared axis These are commonly accepted as the coaxial cables and are divided into two main categories thick a...

Страница 28: ...or terminators Thick coaxial cable is often bright yellow or orange in color The outer jacket will frequently be marked with annular rings dark red or black sections of jacketing that are spaced 2 5 m...

Страница 29: ...mmonly made up of two four or 25 pairs of 22 24 or 26 AWG unshielded copper solid or stranded wires These pairs of wires are twisted together throughout the length of the cable and are broken up into...

Страница 30: ...As the encoded transmissions are now identical there is no change to the data content Line noise spikes however are combined with noise spikes of their exact opposite polarity causing them to cancel...

Страница 31: ...st manufacturers supply hardware built to both of these specifications The more common of the two specifications in 10BASE T applications is EIA TIA 568A Four Pair Cable The typical single UTP cable i...

Страница 32: ...end stations Table 4 1 10BASE T 100BASE TX Four Pair Wire Use Wire Color EIA TIA Pair Ethernet Signal Use 568A 568B White Blue W BL Pair 1 Not Used Blue BL White Orange W OR Pair 2 RX TX Orange OR RX...

Страница 33: ...r pair they are associated with There are two ways of identifying sets of pairs in a 25 pair cable The first is based on the connection of a 25 pair cable to a specific type of connector designed espe...

Страница 34: ...37 A23 B23 TX Orange Black 12 A24 B24 7 RX Black Green 38 A25 B25 RX Green Black 13 A26 B26 TX Black Brown 39 A27 B27 TX Brown Black 14 A28 B28 8 RX Black Gray 40 A29 B29 RX Gray Black 15 A30 B30 TX Y...

Страница 35: ...RX Blue Violet 21 A42 B42 TX Violet Orange 47 A43 B43 TX Orange Violet 22 A44 B44 12 RX Violet Green 48 A45 B45 RX Green Violet 23 A46 B46 TX Violet Brown 49 A47 B47 TX Brown Violet 24 A48 B48 Unused...

Страница 36: ...evice such as a standalone hub or repeater connect to the receive pins of a 10BASE T or 100BASE TX end station If two similarly designed network devices are connected using a straight through cable th...

Страница 37: ...pairs that make up the cable Category 3 UTP cabling must not produce an attenuation of a 10 MHz signal greater than 98 dB km at the control temperature of 20 C Category 4 Category 4 UTP cabling is co...

Страница 38: ...up of a glass strand the core that allows for the easy transmission of light the cladding a less transmissive glass layer around the core that helps keep the light within the core and a plastic buffe...

Страница 39: ...tiple strand cables are available with anywhere from two to 24 or more strands of fiber optics all gathered together into one protective jacket Multimode Multimode fiber optic cabling is designed and...

Страница 40: ...fiber is more expensive to produce than multimode fiber and is typically used in long haul applications Due to the very demanding tolerances involved in connecting two transmissive media with diamete...

Страница 41: ...ted at the upper right hand corner of the female DB15 connector is identified as channel 1 The numbering continues across the top of the connector to channel 8 at the upper left hand corner The channe...

Страница 42: ...4 3 AUI Pinouts AUI Connector Pin Wire Function 1 Logic Ref 2 Collision 3 Transmit 4 Logic Ref 5 Receive 6 Power Return 7 No Connection 8 Logic Ref 9 Collision 10 Transmit 11 Logic Ref 12 Receive 13 P...

Страница 43: ...the cable When used to provide a transceiver tap the coaxial cable is broken at an Annular Ring and two N Type connectors are attached to the resulting bare ends These N Type connectors once in place...

Страница 44: ...gh the insulator to the core wire where signals pass through the cable By contacting the core the pin creates a tap The signals travel through the pin to and from the core Non Intrusive taps are made...

Страница 45: ...commends the use of the crimp on BNC connectors for more stable and consistent connections BNC connectors use the same pin and channel system to provide a contact that is used in the thick coaxial N T...

Страница 46: ...nectors on the cable itself and one of which is used for connection to the Female BNC connection of a transceiver or Desktop Network Interface Card DNI or NIC on a workstation Figure 4 13 Thin Coax T...

Страница 47: ...lip allows the clip to be lowered to release the connector from the port For a complete discussion of connecting and disconnecting RJ45 connectors refer to Chapter 14 Connecting and Terminating RJ45 c...

Страница 48: ...wires or cables coming into the connector The pinout used in any connector is dependent upon the wiring specification to which the cable is constructed The 10BASE T standard requires that all the cab...

Страница 49: ...lf is sizable and the cables that it connects to are often quite heavy so the RJ21 relies on a tight fit and good cable management practices to keep itself in the port Some devices may also incorporat...

Страница 50: ...n 50 rows of four columns each The pins that make up the punchdown block are identified by the row and column they are members of Each of the four columns is lettered A B C or D from leftmost to right...

Страница 51: ...Connector Types 4 27 Ethernet Media Figure 4 19 Punchdown Block Mapping for UTP Cabling A B C D 01 10 11 20 21 30 31 40 41 50 1845n19...

Страница 52: ...different in construction and are not to be used interchangeably Designed by AT T the ST connector replaces the earlier Sub Miniature Assembly or SMA connector The ST connector is a keyed locking conn...

Страница 53: ...he inner housing fits loosely into the outer and slides back and forth with a travel of approximately 2 mm 0 08 in The inner housing ends in two floating ferrules which are very similar to the floatin...

Страница 54: ...Ethernet Media 4 30 Connector Types...

Страница 55: ...may not meet the quality requirements of the networking specification and may therefore be unable to meet the tested characteristics listed below The Category of cabling used in a network installatio...

Страница 56: ...ng or clocking schemes may be affected by jitter due to excessive signal reflection Any 10BASE T cable installation should not exceed 5 0 ns of jitter If a cable run meets the 10BASE T impedance requi...

Страница 57: ...amount of acceptable cable noise on a 10BASE T segment If a cable that meets all other requirements for 10BASE T operation is experiencing an unusual number of errors the introduction of noise may be...

Страница 58: ...ed above As long as all specifications are met for the entire length of the cable UTP cable segments can be run up to a maximum allowable length of 200 m 656 ft 10BASE F Multimode All Cabletron System...

Страница 59: ...typical dB loss for a splice or a connector is less than 1 dB The loss statistics for any fiber optic cable management hardware should be available from the manufacturer Delay As fiber optic cabling i...

Страница 60: ...quire that installed single mode fiber optic facility cabling and cable hardware meet the following minimum specifications If a network cabling installation is not within the limitations presented her...

Страница 61: ...25 6 s the Ethernet network is out of specifications and error conditions may result To eliminate propagation delay problems incorporate some form of segmentation such as bridging or routing into the...

Страница 62: ...twork device supports internal termination and that device is located at one end of the 10BASE2 cable no external terminators need to be added to the cable segment Connectors Taps 10BASE2 cables may o...

Страница 63: ...10BASE5 specification details the use of thick coaxial cabling and Attachment Unit Interface AUI cables If a thick coaxial cable network does not meet the requirements listed here operation of the 10B...

Страница 64: ...connectors This number does not count the terminating connectors at each end of the cable as taps Grounding Each thick coaxial cable segment should be connected to earth ground at only one point The...

Страница 65: ...end devices must be capable of operating in full duplex mode Cable Type Network operations using 10BASE T are more demanding than normal telephony and thus require specific high quality cabling in ord...

Страница 66: ...t be exceeded Impedance Cabletron Systems 10BASE T equipment requires that 10BASE T cables in the Ethernet network have an impedance within the range of 75 to 165 Typical UTP cables used in Ethernet e...

Страница 67: ...t of acceptable cable noise on a 10BASE T segment If a cable that meets all other requirements for 10BASE T operation is experiencing an unusual number of errors the introduction of noise may be a pro...

Страница 68: ...As long as all specifications are met for the entire length of the cable UTP cable segments can be run up to a maximum allowable length of 200 m 656 ft 10BASE F Multimode All Cabletron Systems 10BASE...

Страница 69: ...10 0 dB or less between any two stations or devices connected by fiber optic cabling When calculating insertion loss you must consider and count any loss introduced by fiber optic splices barrel conne...

Страница 70: ...and cable hardware meet the following minimum specifications If a network cabling installation is not within the limitations presented here the operation of the FOIRL products may be affected Cable T...

Страница 71: ...ay exceeds 25 6 s the Ethernet network is out of specifications and error conditions may result To eliminate propagation delay problems incorporate some form of segmentation such as bridging or routin...

Страница 72: ...Full Duplex Ethernet Network Requirements 6 8 Ethernet FOIRL Single Mode...

Страница 73: ...equired The 100BASE TX specification for Fast Ethernet networks requires UTP cabling Category 5 Categories of UTP cabling below Category 5 may not meet the quality requirements of the networking speci...

Страница 74: ...equency of 100 MHz This calculation must take all cabling devices in the cable path into account A typical insertion loss test must include the jumper cabling used at the station and at the wiring clo...

Страница 75: ...dation examine the cable or cables in question If they are near possible sources of outside noise such as lighting fixtures electric motors or transformers reroute the cable Other Considerations Due t...

Страница 76: ...tic cables must be tested for attenuation with a fiber optic attenuation test set The test set must be configured to determine attenuation of the cable at a wavelength of 850 nm The attenuation test w...

Страница 77: ...timode fiber optic cable segment to 412 m or less Assuming that a fiber optic cable meets all other limitations for 100BASE FX usage it is possible to extend a multimode fiber optic link to an estimat...

Страница 78: ...d into two categories or classes by the 100BASE TX standard The difference between these Class I and Class II repeaters is the method each uses to handle received signals for transmission The differen...

Страница 79: ...different maximum network radii as shown in Table 7 1 Buffered Uplinks Several Fast Ethernet devices support the incorporation of buffered uplinks to help alleviate the pressures placed on network de...

Страница 80: ...Fast Ethernet Network Requirements 7 8 Hybrid Installations...

Страница 81: ...are not capable of full duplex operation a standard Fast Ethernet link will be automatically established Cable Type 100BASE TX network operations are more demanding than those of standard Ethernet and...

Страница 82: ...work have an impedance within the range of 75 to 165 Typical UTP cables used in Fast Ethernet environments have an impedance between 85 and 111 Jitter Jitter may be caused by intersymbol interference...

Страница 83: ...cabling it is susceptible to changes in attenuation due to heat In an installation that exceeds the control temperature of 20 C 68 F the attenuation of PVC jacketed UTP cabling that is within the 11...

Страница 84: ...100 m 328 ft over a UTP cable segment that meets the quality values listed above As long as all specifications are met for the entire length of the cable UTP cable segments can be run up to a maximum...

Страница 85: ...s within an acceptable level The acceptable level of attenuation for a 100BASE FX cable is 11 0 dB Insertion Loss The 100BASE FX specification allows for a total dB loss of 10 dB or less between any t...

Страница 86: ...ength The 100BASE FX specification limits a multimode fiber optic cable segment to 412 m or less Assuming that a fiber optic cable meets all other limitations for 100BASE FX usage it is possible to ex...

Страница 87: ...sulating material such as Polyvinyl Chloride PVC These wires are twisted around one another in a specific arrangement to form pairs The pairs are made up of associated wires transmit wires are paired...

Страница 88: ...e original signal Both the original and the inverted signal are then transmitted the original signal over the TX transmit wire the inverted signal over the TX wire As these wires are the same length t...

Страница 89: ...in Token Ring environments falls into four types called Type 1 Type 2 Type 6 and Type 9 Any of these cable Categories can be used in a Token Ring installation provided that the requisite IEEE 802 5 s...

Страница 90: ...outer wires may be used to carry telephone traffic as the shields surrounding the inner network wires is intended to eliminate the interference that might otherwise occur between the inner and outer p...

Страница 91: ...els The numbering of the wires in USOC standard cables is based on the color of the insulating jacket that surrounds the core of each wire Each jacket will have an overall color brown blue orange gree...

Страница 92: ...be used in a Token Ring installation provided that the requisite IEEE 802 5 specifications regarding the cables are met Table 9 2 IEEE 802 5 Wire Use Wire Color USOC Pair Token Ring Signal Use 568A 5...

Страница 93: ...305 m 1000 ft at the control temperature of 20 C Category 4 Category 4 UTP cabling is constructed in the same manner as the Category 3 cabling discussed previously Category 4 UTP is constructed using...

Страница 94: ...of the LED Not all the rays of light enter the fiber and those that do often do so at an angle which reduces the amount of distance the signal can effectively cover Single mode fiber optics use lasers...

Страница 95: ...ingle narrow ray of light the transmissive core of single mode fiber optics is typically very small 8 to 12 m Single mode fiber is more expensive to produce than multimode fiber and is typically used...

Страница 96: ...lease mechanisms within the connector open the transmit and receive paths in the MIC connector when it is properly attached to another MIC connector Once unplugged the paths are looped back onto one a...

Страница 97: ...rting from the far right pin The lower four pins are numbered from six to nine beginning also at the far right The arrangement of pins in the DB9 connector is shown in Figure 9 5 below Figure 9 5 DB9...

Страница 98: ...TP PMD The difference between the shielded RJ45 and the standard RJ45 is the addition of a metal shielding ground to the plastic housing of the RJ45 connector This shield is connected to the braided...

Страница 99: ...n a series of points that pierce the jacket of the wires and make the connection to the core Different types of connections are required for each type of core composition These connectors are differen...

Страница 100: ...STP cable must be connected to the metal shield of the RJ45 connector The USOC specification orders the pairs in a four pair cable into the pinout shown in Figure 9 7 below The RJ45 connector in the...

Страница 101: ...gurations stranded and solid These names refer to the type of UTP cabling that they are designed to connect to The blades of the RJ45 connector end in a series of points that pierce the jacket of the...

Страница 102: ...e locking clip up The contact blades of the RJ45 connector are numbered from left to right for purposes of identification Figure 9 9 USOC Pair Association The EIA TIA specifications which are used in...

Страница 103: ...rand The ST connector is a locking keyed connector The ST connector may either be male or female Male ST connectors are typically attached to cable strand ends while the female ST connectors are usual...

Страница 104: ...and guide channels pulling the ST connectors together Once the locking pins have reached the ends of the guide channels the ST connector locks into position The locking mechanism of the ST connector...

Страница 105: ...The IEEE 802 5 specifications for Token Ring require the use of STP cables that meet certain design and construction requirements Cabling that is not specifically designed for use in IEEE 802 5 netwo...

Страница 106: ...attenuation for STP cables of Types 1 and 2 are not dependent upon the circuitry type being used by the Token Ring networking hardware The attenuation limit for Type 1 or Type 2 STP at 4 MHz is 22 dB...

Страница 107: ...erating at 4 Mbps may incorporate Type 1 or Type 2 STP links with lengths not exceeding 300 m 984 ft If the Token Ring network operates at 16 Mbps this length is reduced to 150 m 492 ft If the Token R...

Страница 108: ...Type 1 STP link measuring 60 meters the maximum length of Type 6 cable that could be connected to it would be 26 4 m Figure 10 1 Type 6 Cable Calculations Trunk Cable Length Just as there are maximum...

Страница 109: ...A TIA end to end specifications for a Category 5 installation Attenuation The maximum allowable attenuation for any Token Ring UTP cable link is dependent upon the operating speed of the Token Ring ne...

Страница 110: ...stallation Category 3 The maximum acceptable amount of near end crosstalk for a Category 3 UTP link is 23 dB 1000 ft Category 4 The maximum acceptable amount of near end crosstalk for a Category 4 UTP...

Страница 111: ...set to operate at the higher 16 Mbps speed can support a maximum Category 5 link length of 120 m 393 ft The use of passive Token Ring technology reduces the maximum link length to 130 m 426 ft at 4 Mb...

Страница 112: ...aximum Category 5 UTP trunk link length of 120 m 393 ft IEEE 802 5j Multimode Fiber Optics Cable Type IEEE 802 5j multimode fiber optic products for Token Ring networks require specific types of cabli...

Страница 113: ...ptable levels of attenuation for the types of multimode fiber optic cabling supported by Cabletron Systems products are listed in Table 10 1 Link Length The IEEE 802 5j specification sets the maximum...

Страница 114: ...ity to establish links Attenuation Single mode fiber optic cables must be tested with an attenuation test set configured for a 1 300 nm wavelength The attenuation test will confirm or deny that the ca...

Страница 115: ...r 26 AWG unshielded copper solid or stranded wires These pairs of wires are twisted together throughout the length of the cable These twisted pairs of wire within the UTP cable are broken up into tran...

Страница 116: ...nce that affects one member of the pair with have the same effect on the other member of that pair The transmission travels through the cable eventually reaching a destination transceiver At this loca...

Страница 117: ...eight wires in a four pair cable the EIA TIA specification to which the cable is constructed is of prime importance The arrangement of the wires and pairs in the EIA TIA 568 specifications is discuss...

Страница 118: ...lity characteristics detailed in the ANSI X3T9 5 TP PMD specification UTP cabling that is Category 4 or lower is not capable of meeting the stringent quality requirements of the TP PMD specification a...

Страница 119: ...ated wires transmit wires are paired with transmit wires receive wires are paired with receive wires Each pair in the STP cable is then surrounded by a metallic foil shield that runs the length of the...

Страница 120: ...both signals are read in The original signal is unchanged but the signal that had previously been inverted is reverted to the original state When this is done it returns the encoded transmission to it...

Страница 121: ...ndividual wires are twisted into pairs The pairs that are formed by this twisting are then surrounded by a mylar foil shield These shielded pairs are then laid alongside one another in an overall brai...

Страница 122: ...tic which uses pulses of light as a transmission method Because fiber optics do not utilize electrical charges to pass data they are free from the possibility of interference due to proximity to elect...

Страница 123: ...surrounds the core Thus fiber optic measurements will usually provide two numbers separated by the symbol The first number is the diameter in microns of the core The second is the diameter of the cla...

Страница 124: ...ng technology allows for the creation of single mode fiber optic cabling runs of up to 58 km Due to the very demanding tolerances involved in connecting two transmissive media with diameters approxima...

Страница 125: ...ing RJ45 connectors for UTP cabling are available in two basic configurations stranded and solid The names refer to the type of UTP cabling that they are designed to connect to The blades of the RJ45...

Страница 126: ...braided outermost shield of the STP cable The connector itself is a rectangular keyed connector with a locking clip The RJ45 connector may only be inserted into an RJ45 port in its proper alignment a...

Страница 127: ...In addition to arranging the cables properly the braided shield of the STP cable must be connected to the metal shield of the RJ45 connector Fiber Optics FDDI MIC The FDDI Media Interface Connector no...

Страница 128: ...DDI connectors and ports each incorporate floating ferrules that make the final connection between fibers These floating ferrules are held in place relatively loosely This arrangement allows the ferru...

Страница 129: ...nner housing fits loosely into the outer and slides back and forth with a travel of approximately 2 mm 0 08 in The inner housing ends in two floating ferrules which are very similar to the floating fe...

Страница 130: ...FDDI Media 11 16 Connector Types...

Страница 131: ...with MMF PMD compliant products but the performance of links made with these nonstandard cables will be reduced Attenuation The FDDI specification allows any FDDI link made over multimode fiber optic...

Страница 132: ...equirements are not met the strength of the FDDI signal will be insufficient for proper recognition and reception If an FDDI transmitter does not produce signals with an emitted power of 20 dBm or bet...

Страница 133: ...power requirements If these power requirements are not met the strength of the FDDI signal will be insufficient for proper recognition and reception If an FDDI transmitter does not produce signals wit...

Страница 134: ...er requirements If these power requirements are not met the strength of the FDDI signal will be insufficient for proper recognition and reception If an FDDI transmitter does not produce signals with a...

Страница 135: ...ification details the use of STP cabling for Single Attached Station connections only The use of STP cabling to configure a dual counterrotating ring is not in compliance with the TP PMD specification...

Страница 136: ...FDDI Network Requirements 12 6 TP PMD STP...

Страница 137: ...ng plant or troubleshooting operations and can help speed the process of locating and repairing cable problems The three types of cable management devices treated in this section are those used for ha...

Страница 138: ...small as one meter 3 28 ft to as tall as two meters 6 56 ft or more Equipment is fastened to the rack with screws or bolts The bolts are passed through some form of frame on the device to be mounted...

Страница 139: ...s to ensure that unauthorized personnel will not be able to modify the current organization of cables and devices The enclosed equipment cabinet also presents a more finished appearance and is often u...

Страница 140: ...simplified connections to jumper cabling allowing a single manageable point of access for several cables Patch panels are typically built to be mounted in a relay rack or enclosed equipment cabinet Th...

Страница 141: ...ons The harmonica provides front surface modular connections like a patch panel The back surface provides one or more RJ21 connectors Through the use of a harmonica one or more 24 pair UTP cables with...

Страница 142: ...n and the rightmost column of pins to the inside right column Punchdown blocks are also available which provide a prewired 50 pin RJ21 connector for connection to 25 pair facility UTP Punchdown blocks...

Страница 143: ...x provides an access point for multiple strand facility fiber optic cable As distribution boxes are commonly used as intermediary cabling devices they are designed to be mounted to walls or ceilings F...

Страница 144: ...nstruction of a modular wallplate allows a number of individually selected connector types to be placed in each individual wallplate Using the modular wallplate construction options you may have wallp...

Страница 145: ...ol the placement of cable in a facility Cable management is an often overlooked but exceptionally important part of installation planning and maintenance The devices described below can prove very use...

Страница 146: ...e in place and secured using screws rivets or adhesive cabling is passed through the rings The D rings support the weight of the cables run through them and keep the cables in one location D rings may...

Страница 147: ...hich provides lines of J hooks along the walls for the routing of temporary cables Figure 13 9 J Hooks Strain Relief Bracket The strain relief bracket is a cable management device that is often used w...

Страница 148: ...for network or telephony cabling are already installed in walls of these types cabling should not be fished down within them In these situations the use of a surface mount box takes care of the need f...

Страница 149: ...s the tray type raceway Open on the top the tray type raceway is often run along walls like a series of D rings or used in open areas such as the space above suspended ceilings to force cabling to fol...

Страница 150: ...ve Anchor Ty wraps are inexpensive and easy to use even with one hand They are tough and flexible resistant to water and moisture and last for years Besides being used to bundle cable together Ty wrap...

Страница 151: ...pes Ethernet DB15 DB15 connectors and ports are used to make connections between Ethernet transceivers and Ethernet stations The DB15 connector is the most commonly encountered Ethernet AUI cable conn...

Страница 152: ...he port If a link indicator is present for the port check to see if it is on If it is not on perform the following actions until you achieve a valid link Check that the Ethernet transceiver device at...

Страница 153: ...aised locking clip of the RJ45 connector is inserted into the correct location Figure 14 2 RJ45 Connector Insertion 2 Press the RJ45 connector into the port until the click of the locking clip is felt...

Страница 154: ...e port If the connector will not come out there may be damage to the locking clip Examine the arm of the locking clip While pressing the arm back toward the shell of the connector verify that the clip...

Страница 155: ...loss and cable specifications outlined in 10BASE T Twisted Pair Network Requirements If all else fails contact Cabletron Systems Technical Support To remove the RJ21 connector from the jack unfasten a...

Страница 156: ...or does not show a valid connection perform the following actions until you achieve a link Examine the BNC connector for a bent or damaged center pin A badly corroded pin may not connect properly Veri...

Страница 157: ...le continuing to apply light forward pressure As the threads of the male and female housings match up the contacts will be pulled together 3 Once the male N type connector housing can no longer be tur...

Страница 158: ...eck that they are on If an indicator is present but not on that port does not have a valid link Perform each of the following steps until you reach a resolution of the problem and achieve a link Check...

Страница 159: ...The connector will only connect if it is properly aligned Figure 14 7 DB9 Connector Insertion 2 Firmly press the DB9 connector over the DB9 port Once the connector has been fully inserted secure the...

Страница 160: ...fications outlined in Token Ring Network Requirements If all else fails contact Cabletron Systems Technical Support To remove the DB9 connector from the port once it is locked in unscrew both of the m...

Страница 161: ...Check the cable for continuity Check that the twisted pair connection meets dB loss and cable specifications outlined in IEEE 802 5 Twisted Pair Network Requirements If all else fails contact Cabletr...

Страница 162: ...the locking arms on the top and bottom of one connector should snap into place with an audible click If the connectors do not slide together rotate one of the two connectors 180 and re attempt the con...

Страница 163: ...h strand of cable 1 Remove the protective plastic covers from the fiber optic ports on the applicable port on the module and from the ends of the connectors on each fiber strand 2 Attach one fiber to...

Страница 164: ...optic cable If this is unsuccessful contact Cabletron Systems Technical Support FDDI RJ45 The RJ45 connector is used to make TP PMD connections using either UTP or STP cabling The instructions which...

Страница 165: ...RJ45 connector from the port once it is locked in grasp the cable where it enters the network device Using your finger or a non conductive probe the cap of a ballpoint pen is a useful tool for recesse...

Страница 166: ...ed in Table 14 1 below Snap the insert into place in the recessed channel of the FDDI MIC connector The MIC connector is now ready to be connected to the type of port indicated by the key 1 Align the...

Страница 167: ...eck that the fiber optic connection meets all cable specifications outlined in ANSI X3T9 5 MMF PMD or SMF PMD Network Requirements whichever applies If all else fails contact Cabletron Systems Technic...

Страница 168: ...s are prelabeled providing matching labels or tapes at both ends of each strand of cable 1 Remove the protective plastic covers from the fiber optic port on the applicable module and from the ends of...

Страница 169: ...pecifications outlined in FDDI Network Requirements If you are still unable to establish a link attempt to make the connection between the devices with another fiber optic cable If this is unsuccessfu...

Страница 170: ...Connecting and Terminating 14 20 FDDI...

Страница 171: ...um and recommended characteristics for standards compliant cabling for Ethernet Token Ring and FDDI networks Ethernet 10BASE5 Cable Characteristics 10BASE2 Cable Characteristics Aspect Limit Tap Spaci...

Страница 172: ...10 MHz 11 5 dB Jitter 5 0 ns One way Propagation Delay 1000 ns Max Length 200 m Aspect 50 125 m 62 5 125 m 100 140 m Attenuation 850 nm 13 0 dB 16 0 dB 19 0 dB Insertion Loss 10 MHz 10 dB 10 dB 10 dB...

Страница 173: ...itter 5 0 ns One way Propagation Delay 1000 ns Max Length simplex 200 m Max Length duplex 200 m Aspect 50 125 m 62 5 125 m 100 140 m Attenuation 850 nm 13 0 dB 16 0 dB 19 0 dB Insertion Loss 10 MHz 10...

Страница 174: ...m IBM Types 6 9 200 m 100 m passive IBM Types 1 2 200 m 100 m IBM Type 9 133 m 66 m UTP active Category 5 250 m 120 m Categories 3 4 200 m 100 m passive Category 5 130 m 85 m Categories 3 4 100 m 60...

Страница 175: ...nuation dB km 22 45 33 66 Aspect Category 3 Category 4 Category 5 4 Mbps 16 Mbps 4 Mbps 16 Mbps 4 Mbps 16 Mbps Impedance 85 115 Attenuation dB km 56 131 42 88 42 82 Near End Crosstalk 23 dB 1000 ft 36...

Страница 176: ...y 5 UTP cabling only IBM Type 1 STP cabling only Table 14 2 FDDI Distance Limitations Media PMD Standard Max Link Distance Fiber Optics Multimode MMF PMD 2 km Fiber Optics Single Mode SMF PMD 60 km Un...

Страница 177: ...h governs the operation of devices connecting to Ethernet fiber optic cable Supersedes previous FOIRL standard 10BASE T IEEE standard which governs the operation of devices connecting to Ethernet Unsh...

Страница 178: ...tstrap Protocol Checks MIB variables of an SNMP manageable device to determine whether it should start up using its existing firmware or boot up from a network server specifically configured for the p...

Страница 179: ...to a password a Community Name acts to restrict access to control capabilities and network statistics Concentrator A network device which allows multiple network ports in one location to share one ph...

Страница 180: ...pin connector typically used in Token Ring networks and for serial communications between computers Decryption The translation of data from an encrypted see encryption form into a form both recogniza...

Страница 181: ...sion See also CSMA CD Fault Tolerance The ability of a design device or network to operate at full or reduced capacity after suffering a failure of some essential component or connection See also redu...

Страница 182: ...ting modular chassis and reinserted or replaced without requiring that the chassis and all associated modules be powered down Hub See Modular Chassis IANA Internet Assigned Numbers Authority An agency...

Страница 183: ...e electrical signals Jitter is often a result of passing a signal through too many repeaters LAN Local Area Network LANVIEW A system which relates diagnostic troubleshooting and operational informatio...

Страница 184: ...network or networks Module A discrete device which is placed in a modular chassis to provide functionality which may include but is not limited to bridging routing connectivity and repeating Modules...

Страница 185: ...sed by Token Ring end nodes to the MAU to open the relay for that port Plenum A cabling term which indicates a cable with insulating material that is considered safe to use in return air plenum spaces...

Страница 186: ...ent network segments but allows information to flow between them when necessary The router unlike a bridge examines the data contained in every packet it receives for more detailed information Based o...

Страница 187: ...e some ports while others remain in a standby condition avoiding the data loops and providing redundant paths in the event of bridge failures SQE Signal Quality Error A self monitoring test performed...

Страница 188: ...ies that it may transmit data for a specified length of time Once that time has expired the station must stop transmitting and pass the token along to the next station in the network Token Ring A netw...

Страница 189: ...5 10 terminators 5 9 10BASE F attenuation 5 5 6 5 cable requirements 5 4 6 4 insertion loss 5 5 6 5 link length 5 6 6 6 propagation delay 5 5 6 5 10BASE T 5 1 6 1 attenuation 5 1 5 3 6 2 6 3 cable de...

Страница 190: ...able quality 11 7 STP cable types 12 5 STP link length 12 5 UTP attenuation 12 4 UTP cable quality 11 4 UTP cable types 11 1 12 4 UTP link length 12 5 Fiber Optics composition 4 14 identifying 4 15 mu...

Страница 191: ...ASE5 Thin coaxial cable 4 4 Thinnet See 10BASE2 Token Ring link length combined media 10 4 multimode fiber attenuation 10 9 link length 10 9 trunk length 10 9 single mode fiber attenuation 10 10 link...

Страница 192: ...Index 4...

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