Cabletron Systems bridges manuale d’uso

Cabletron Systems Networking Guide Workgroup Solutions[...]

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i Notice Notice Cabletron Systems r eserves the right to make changes in specifications and other information contained in this document without prior notice. The reader should in all cases consult Cabletr on Systems to determine whether any such changes have been made. The hardwar e, firmware, or softwar e described in this manual is subject to [...]

Notice ii[...]

iii Chapter 1 Intr oduction Using This Guide ......................................................................................................................... 1-1 Document Organization ............................................................................................................. 1-2 Document Conventions ......................[...]

Contents iv Chapter 5 Netw ork Design The Role of the W orkgroup ........................................................................................................ 5-2 W orkgroup Establishment Criteria .................................................................................... 5-3 Selecting W orkgroup T echnologies ..................[...]

v Contents Appendix A Char ts and T ables W orkgroup Design T ables ......................................................................................................... A-1 Ethernet ................................................................................................................................. A-1 Fast Ethernet................[...]

Contents vi[...]

1-1 Chapter 1 Intr oduction Using This Guide The Cabletron Systems Networking Guide - W orkgroup Solutions is intended to provide much of the information necessary to allow Network Managers to design and evaluate workgroup networks using the Cabletr on Systems family of standalone and stackable networking products. This guide also pr ovides the met[...]

Introduction 1-2 Document Organization Document Or ganization The following summarizes the organization of this manual: Chapter 1, Introduction , provides basic information about this document, including the organization and format of the document. Chapter 2, Review of Networking , describes the important design restrictions and characteristics of [...]

Document Conv entions 1-3 Introduction Document Con ventions W arnings and Notifications Formats References to chapters or sections within this document ar e printed in boldface type. References to other Cabletr on Systems publications or documents are printed in italic type. Additional Assistance The design of a network is a complex and highly sp[...]

Introduction 1-4 Related Documentation Related Documentation The following publications may be of assistance to you in the design process. Several of these documents present information supplied in this guide in gr eater or lesser detail than they are pr esented here. • Cabletron Systems Networking Guide - MMAC-FNB Solutions • Cabletron Systems[...]

2-1 Chapter 2 Re vie w of Netw orking This chapter discusses the defining characteristics of three major Local Area Network (LAN) technologies. Before discussing the selection of networking har dware for workgr oup design, an understanding of the major standardized networking technologies available for these designs is necessary . This chapter pro[...]

Re view of Netw or king 2-2 Ether net Ethernet Ethernet is a local area networking technology that was initially developed in the 1970s by the Xerox Corporation. It is based on the principles of workstations being responsible for their own transmissions and operation. It is sometimes referr ed to as 802.3 networking, in refer ence to the number of [...]

F ast Ether net 2-3 Re view of Netw or king • AUI Length: The maximum Attachment Unit Interface (AUI) cable length is 50 m for connections from a transceiver to an Ethernet device. The 50 m distance is the allowable maximum for standard AUI, while a maximum length of 16.5 m has been set for office AUI. • Number of Stations per Network: IEEE st[...]

Re view of Netw or king 2-4 F ast Ether net This signal path, two end stations and the repeaters between them, is called the network radius. Unlike standard Ethernet networks, Fast Ethernet networks have a maximum network radius that may restrict the lengths of station cabling to less than the maximum allowable distances for single links. T ypicall[...]

T oken Ring 2-5 Re view of Netw or king Fast Ethernet networks designed using Class II repeaters may not exceed the following maximum network radii: - 200 m for homogenous 100BASE-TX networks - 320 m for homogenous 100BASE-FX networks • Buffer ed Uplinks: If a buffer ed uplink is used to make a connection, the allowable length of the buffer ed up[...]

Re view of Netw or king 2-6 T oken Ring The transmission and reception of the token determines the amount of time that any station will have to transmit data during its turn, offering a measur e of predictability not available in Ethernet or Fast Ethernet. This pr edictability also allows T oken Ring networks to incorporate special error -detection[...]

T oken Ring 2-7 Re view of Netw or king T oken Ring networks can use a variety of physical cabling, including Unshielded T wisted Pair (UTP), Shielded T wisted Pair (STP), or fiber optic cabling. The characteristics of the various cables can directly impact the operational limitations of a T oken Ring network which uses a particular media. • Lob[...]

Re view of Netw or king 2-8 T oken Ring • Number of Stations Per 4 Mbps T oken Ring: In the same fashion as the limits imposed on cable lengths due to the operating speed of the network and type of cabling used, there ar e limitations on the number of stations that may be connected to a single ring using active circuitry . If these numbers are ex[...]

T oken Ring 2-9 Re view of Netw or king There ar e other limitations involved in the IEEE 802.5 standard and the various cable specifications that are mor e detailed and complex. These limitations are covered in detail in the Cabletr on Systems Cabling Guide and the Cabletr on Systems T oken Ring T echnology Overview .[...]

Re view of Netw or king 2-10 T oken Ring[...]

3-1 Chapter 3 The W orkgr oup Appr oac h This chapter describes the basic operation and design of stackab le and standalone de vices and the methods used to meet common networking needs with these de vices. Standalone and stackable networking devices are specialized and important parts of any end-to-end network design strategy . Understanding the d[...]

The W or kgroup Approach 3-2 Standalones Standalones, the Original Networking De vices Standalone devices are the second oldest devices in Local Area Networking, having been developed shortly after transceivers. The basic and most straightforward standalone device is the r epeater or concentrator , a device that allows a network signal received on [...]

Standalones 3-3 The W or kgroup Approach Management of Standalones As standalone devices became more complex, the need to contr ol them became greater . The need to have some form of troubleshooting and contr ol process in place for an eight-port repeater is minimal. In a r epeated network where mor e than 200 users are connected to a single r epea[...]

The W or kgroup Approach 3-4 Stackab les Stac kables T o cope with the limited flexibility and expandability of standalones, the stackable hub, or stackable, was developed. The stackable design allowed a series of devices to act as a single device. W ith a stackable hub system, five separate devices could act as a single device. From the point of[...]

Stackab les 3-5 The W or kgroup Approach How Stac ks W ork Stackable hubs communicate with one another through pr oprietary interconnection cables. The cables used in Cabletr on Systems’ stackable hub solution are called HubST ACK Interconnect Cables. In Ethernet stackable environments, these cables ar e short, multistrand cables with special, D-[...]

The W or kgroup Approach 3-6 Stackab les HubST ACK Interconnect Cables are connected in a particular sequence, fr om the OUT port of the first device in the stack to the IN port of the next. This arrangement is repeated fr om device to device as more stackable hubs ar e incorporated in the stack, as shown in Figure 3-3. Intelligence in the Stack O[...]

Stackab les 3-7 The W or kgroup Approach Initially , Network Designers wishing to make connections from stacks to backbone technologies would be forced to add an additional standalone device to the network at the workgroup ar ea. The addition of a standalone switch, bridge, or router that supported the technology of the stack and the technology of [...]

The W or kgroup Approach 3-8 Stackab les In addition, stackable and standalone devices are typically available for only the most common of networking media: UTP and STP . In situations where several users connect to the network with UTP , a few make their connections with fiber optics, and there is a handful of existing coaxial cable segments, a s[...]

4-1 Chapter 4 PIMs and BRIMs This chapter deals with the special methods of connecting standalone and stackab le de vices to one another regardless of cabling media or netw orking technology . While many network design implementations are simple and straightforwar d, there ar e several that must incorporate complexity beyond a single segment, media[...]

PIMs and BRIMs 4-2 P or t Interface Modules The PIMs can be added at any time, allowing a Network Manager to add capabilities for special links at any time. Originally developed for use in the Cabletron Systems Media Interface Module (MIM) line for the MMAC-FNB modular chassis, the PIMs allow a device to support an additional type of cabling in add[...]

P or t Interface Modules 4-3 PIMs and BRIMs The suffix of the PIM’s pr oduct name, which follows the hyphen, specifies what media type and connector style the PIM provides. T ypically any alphabetic characters indicate the media, while numerical characters indicate a special connector type for that media. The “F” in the example shown in Fig[...]

PIMs and BRIMs 4-4 P or t Interface Modules TPIMs TPIMs are T oken Ring Port Interface Modules. A TPIM provides a single T oken Ring connection. If the T oken Ring device the TPIM has been placed in allows it, the TPIM connection can be used as either a station port or a RI/RO port. All TPIMs use active T oken Ring circuitry . The available TPIMs a[...]

P or t Interface Modules 4-5 PIMs and BRIMs APIMs The Asynchronous T ransfer Mode (A TM) Port Interface Modules, or APIMs, ar e designed to allow connection to differing A TM networks, supporting not only differ ent media, but differ ent speeds of A TM transmission. When selecting an APIM, the Network Designer must ensure that the APIM supports bot[...]

PIMs and BRIMs 4-6 P or t Interface Modules T able 4-1 provides basic information r egarding the available PIMs and the connectors, media, and technologies they support. T able 4-1. PIM Reference T able PIM T echnology Media Connector EPIM-A Ethernet AUI DB15 (Male) EPIM-C Ethernet Thin Coaxial RG58 EPIM-F1 Ethernet Multimode Fiber Optics SMA EPIM-[...]

P or t Interface Modules 4-7 PIMs and BRIMs FPIM-00 FDDI Multimode Fiber Optics FDDI MIC FPIM-01 FDDI Multimode Fiber Optics SC FPIM-02 FDDI UTP RJ45 FPIM-04 FDDI STP RJ45 FPIM-05 FDDI Single Mode Fiber Optics FDDI MIC FPIM-05 FDDI Single Mode Fiber Optics SC APIM-1 1 A TM (T AXI) Multimode Fiber Optics SC APIM-21 A TM (OC3c) Multimode Fiber Optics[...]

PIMs and BRIMs 4-8 Bridge/Router Interface Modules Bridge/Router Interface Modules In the same way that Cabletron Systems supplied a method for connecting a single network technology to differ ent types of media, the Bridge/Router Interface Module, or BRIM, allows one networking technology to be connected to either a separate, segmented network or [...]

Bridge/Router Interface Modules 4-9 PIMs and BRIMs BRIM-F6 The BRIM-F6 is an FDDI bridging device used to connect a standalone device to an FDDI network. The BRIM-F6 provides two user -configurable FPIM slots, allowing the Network Designer to specify and use any type of standard FDDI media for connection to the BRIM. The BRIM can be configured to[...]

PIMs and BRIMs 4-10 Bridge/Router Interface Modules The available BRIMs and the technologies they support are detailed in T able 4-2. This table can be useful for the selection of a BRIM when designing a workgroup requiring a connection to a particular networking technology . T able 4-2. BRIM Reference T able BRIM T echnology Connector T ype BRIM-E[...]

5-1 Chapter 5 Netw ork Design The f ollo wing chapter discusses some of the more common approaches to workgroup network design. The network design process is the formation of the network fr om initial concept to the plan of implementation. In this Networking Guide, for the sake of brevity , the process of network design is separated fr om the proce[...]

Network Design 5-2 The Role of the W orkgroup As this Networking Guide is concerned with the decisions made regar ding networking hardwar e and not with the administration of networks or the specific uses to which they are put, several aspects of the overall pr ocess of network design are not tr eated in this document, such as the selection of a N[...]

The Role of the W orkgroup 5-3 Network Design W orkgroup Estab lishment Criteria This section examines some of the methods that may be used to divide the population mass of end users of a network into cohesive and defined workgroups. Geographical Pro ximity Organizing workgr oups by geographical proximity cr eates workgroups made up of discrete se[...]

Network Design 5-4 The Role of the W orkgroup Departmental Organization Corporations, companies, and agencies all separate employees by primary function. No one person “does it all,” and most employees are specialists in the sense that they perform one function or a series of functions that are assigned to them by their job descriptions. These [...]

The Role of the W orkgroup 5-5 Network Design As the creation of workgr oups based on departmental organization mirr ors the operation of the company , the expandability of the network is simplified; since departmental growth can often be pr edicted in stable or growing companies, the network can be designed to allow for simplified expansion in t[...]

Network Design 5-6 The Role of the W orkgroup Common Function Segmentation by common function is often used to provide further division of the network within larger overall departments, or to facilitate the use of certain network applications by specific end users common throughout much of the department. An example of this might be the creation o[...]

The Role of the W orkgroup 5-7 Network Design Priority Organization Priority organization is a flexible term that r efers to the Network Manager assigning devices to workgroups based on specific priorities. As such, it is the most flexible scheme for creating workgr oups, because it is based solely on the relative importance of certain network c[...]

Network Design 5-8 The Role of the W orkgroup Priority organization of this manner in a single-segment network involves providing stations in the priority workgr oups with qualities of media and network connection based on that priority . For example, the stations in the server farm might have redundant connections to the network in the event that [...]

The Role of the W orkgroup 5-9 Network Design Selecting W orkgroup T echnologies The selection of a network technology at the workgroup level is a very important decision, and one that should be made only after careful consideration and evaluation. Before deciding on a network technology to be used by the workgroups, make sur e you are familiar wit[...]

Network Design 5-10 Creating a Manageable Plan Creating a Manageable Plan A well thought-out and carefully designed network is still difficult to troubleshoot if no one else knows how it is or ganized. There may come a time when the designer of the network is not available, for whatever reason, and troubleshooting or r e-configuration needs to be[...]

Creating a Manageable Plan 5-11 Network Design • Centralization and Control - If you r equire mor e control over the networking hardwar e than you can get from locking it away , you can place many devices in one central location such as a Network Management office. For a small facility , it is entirely possible that all the networking hardwar e [...]

Network Design 5-12 Creating a Manageable Plan Use a standard, decipherable labeling code for cable and har dware. A label reading L2N5W2C1S243 may look like gibberish now , but if you know that the letter codes indicate locations or conditions of installation, it can be quite helpful. T able 5-1, below , shows the meanings of the codes and numbers[...]

Creating a Manageable Plan 5-13 Network Design Single P oints of Failure A single point of failure is any one device, cable or connection that, if it should fail or be removed fr om the network, would disable all or a sizable part of the network. Most Cabletron Systems har dware seeks to eliminate single points of failur e from within the device, b[...]

Network Design 5-14 Creating a Manageable Plan Isolation and Recovery No matter how much redundancy is designed into a network, and no matter how much the single points of failure ar e eliminated, the law of averages eventually catches up to any network, and a failure will occur . Once the failure does occur , the isolation and recovery pr ocess be[...]

Network Expandability 5-15 Network Design T racking Changes Y our network maps will be used for keeping track of a large amount of information, which will naturally change over time. As the network grows or is altered, the devices that make up the network will change, new workgr oups will be added, segmented off fr om larger workgr oups or combined[...]

Network Design 5-16 The W orkgroup as the Network The W orkgr oup as the Netw ork In many cases, the only network that a facility requir es is a single workgroup. Depending on the bandwidth, segmentation, and security requir ements of any facility , the single workgroup may be all that is needed. In these situations, the only network to be consider[...]

The W orkgroup in the Larger Network 5-17 Network Design What Is a Bac kbone? A backbone is a network segment or cable which is used to provide for the interconnection of a number of smaller workgr oups or self-contained networks. The outlying networks, workgroups, or hubs communicate with one another through the backbone network. The use of a dedi[...]

Network Design 5-18 The Workgroup in the Larger Network The Distributed Bac kbone One method of creating a backbone network is to sequentially string all of the workgroup networks or hubs together . Cabling is run from one workgr oup hub to the next, providing the necessary connections. This method of configuring a backbone network, as shown in Fi[...]

The W orkgroup in the Larger Network 5-19 Network Design The Collapsed Backbone It is also possible to run cables fr om a central point, often a network management office or central wiring closet, out to each workgr oup network and back. These cabling runs ar e then terminated at a central point such as a patch panel. The patch panel ports for eac[...]

Network Design 5-20 The Workgroup in the Larger Network • Simplified T roubleshooting - W orkgroups can be bypassed by simply reconfiguring a single patch panel. This can easily isolate a pr oblem segment for troubleshooting, and keeps the backbone network fr om being kept in a fault condition. • Moderate Control - The isolation of workgr oup[...]

The W orkgroup in the Larger Network 5-21 Network Design • Simplified T roubleshooting - The device collapsed backbone, by connecting the workgroups thr ough a manageable device, provides not only simplified troubleshooting, but the ability to detect some backbone faults befor e they become network failures. • Extensive Control - The device c[...]

Network Design 5-22 The Workgroup in the Larger Network[...]

6-1 Chapter 6 Ethernet This chapter describes in detail the processes and decisions inv olved in designing an Ethernet workgroup using Cab letron Systems products. Once the proposed network has been br oken into a number of workgroups, it is necessary to begin designing the actual solutions for those workgroups and selecting hardwar e for use in th[...]

Ether net 6-2 Ether net W orkgroup Devices Ethernet W orkgroup Devices The following sections describe the various Cabletron Systems networking devices that may be used in an Ethernet workgroup implementation. These Ethernet devices are divided into two categories - shar ed Ethernet devices and switched Ethernet devices. Shared Ethernet devices ar [...]

Ether net W orkgroup Devices 6-3 Ether net T ype The type column describes what functions the device in question performs. There are thr ee basic types of devices covered by this table. Repeaters ar e standalone Ethernet multiport repeaters. They count as a single r epeater hop for purposes of calculating maximum network size or propagation delay .[...]

Ether net 6-4 Ether net W orkgroup Devices Switched De vices Ethernet segmentation and switching designs requir e some slightly differ ent information and decisions. Several of the important factors to consider when selecting a segmentation-based workgroup scheme ar e listed along with the Cabletron Systems Ethernet switch pr oducts in T able 6-2, [...]

Ether net W orkgroup Design 6-5 Ether net Ethernet W orkgroup Design When designing a new workgroup, one of the first tasks to be confr onted is the selection of a technology and an approach to the network. These selections ar e based on the organization of the workgr oups, as discussed in Chapter 5, Network Design , the scale (or population) of t[...]

Ether net 6-6 Ethernet Workgroup Design Abstracting the Design Process There ar e a series of logical stages that must be kept in mind when designing a network for any location, including the relatively simple home of fice. The first parts of the design process involve the decisions r elating to the technology and media to be used in the workgrou[...]

Ether net W orkgroup Design 6-7 Ether net Some Cabletron networking devices, thr ough their support of PIMs and BRIMs, will support a small number of connections using differ ent media. For example, an Ethernet network which is made up primarily of 10BASE-T links has a single multimode fiber optic connection to a distant building. If a standalone [...]

Ether net 6-8 Ethernet Workgroup Design In an effort to pr ovide some measure of dif ferentiation between the varying levels of expense, the design tables which list a series of possible selections in a particular category attempt to organize the networking devices pr esented in ascending order of expense. In many cases, the dif ference between the[...]

Ether net W orkgroup Design 6-9 Ether net The table below shows the selection field of Cabletron Systems shar ed Ethernet workgroup devices. This is the same table that was displayed at the beginning of this chapter . During the course of the design example, sections of the table shown will be removed to indicate the gradual r eduction of choices [...]

Ether net 6-10 Ether net W orkgroup Design The media selected for the network is inexpensive Category 3 UTP jumper cabling. The low cost, durability , and ready availability of UTP makes it by far the preferr ed media for this installation. If there wer e specific electrical noise or distance considerations, the Network Designer may have decided t[...]

Ether net W orkgroup Design 6-11 Ether net The Network Designer checks the Cabletron Systems Networking Solutions Pr oduct Guide to examine the characteristics and full description of the MR9T . Deciding that the product will fit well into the installation, the Network Designer makes a call to the Cabletron Systems Sales Department and works out t[...]

Ether net 6-12 Ether net W orkgroup Design The small office location is an ideal place to examine the suitability of stackable networking devices. As these locations fall into a space between tiny workgroups and full-scale facility networks, they are the tar get location for stackables. The sections below describe the important criteria that need [...]

Ether net W orkgroup Design 6-13 Ether net Expandability The simplicity and fluidity of expansion in a small office setting is of paramount importance. Every small office wants to expand, even if it is an addition of nothing more than a few additional networked computers. The ability to quickly and efficiently incr ease the number of available [...]

Ether net 6-14 Ether net W orkgroup Design Design Example The following example follows a Network Designer ’s selection process for a small office Ethernet network. As in the previous example, the Network Designer has already decided upon a networking technology (Ethernet) and a media type (10BASE-T) for the network. The location being considere[...]

Ether net W orkgroup Design 6-15 Ether net As the network will be using UTP cabling, the SEHI-22FL can be removed from the selection field. Since growth is expected to be minimal, the Network Designer turns to examine the products that can be used in standalone mode. Considering the r emaining field of devices, this reduces the choices available [...]

Ether net 6-16 Ether net W orkgroup Design through an inter connect cable and have a stack providing 36 ports. This entir e stack will act as a single repeater , and the management functions that are included in the SEHI-24 will be applied also to the SEH-22 in the stack. Figure 6-4. Ethernet Small Office Implementation The Remote Office The remo[...]

Ether net W orkgroup Design 6-17 Ether net Figure 6-5. FDDI Backbone Internetworking The main differ ence between the small office and the r emote office is that a provision must be made to accommodate a connection to a dif ferent networking technology . In the case of Cabletron Systems workgroup pr oducts, this process has been simplified by th[...]

Ether net 6-18 Ether net W orkgroup Design Design Example For an example of remote of fice workgroup configuration, we will build upon the previous small of fice example. Let us assume that there has been no gr owth of the small office network, but the pottery distributor has been pur chased by a larger , nationwide chain of distributors. The f[...]

Ether net W orkgroup Design 6-19 Ether net Figure 6-6. Ethernet Remote Office Implementation The High-End Depar tment The high-end department is a workgroup with specialized needs, demanding high reliability or high thr oughput to each and every station. The high-end department typically consists of the most demanding users on the network, and con[...]

Ether net 6-20 Ether net W orkgroup Design Management In a network using any form of segmentation, whether it is bridging, switching, or routing, management functionality is a part of the devices needed to cr eate the network. W ithout some form of management, segmentation decisions can not be made by the devices. The level of management available [...]

Ether net W orkgroup Design 6-21 Ether net Design Example As an example, we can examine a network design that is being planned for a group of Computer -Aided Design (CAD) engineers in a large ar chitectural firm. These CAD designers want to replace their existing shar ed Ethernet LAN with a network that provides gr eater throughput between their e[...]

Ether net 6-22 Ether net W orkgroup Design The Network Designer is looking for one or more per -port Ethernet switches that can be used to make network connections to the stations in the CAD department. The Network Designer examines the selection field of Ethernet switches, shown in T able 6-2. All of these devices meet the initial criteria; they [...]

Ether net W orkgroup Design 6-23 Ether net The Network Designer selects the ESX-1320 and calculates that two ESX-1320 switches, each containing one BRIM module for an FDDI connection, will meet the needs of the CAD department. The Network Designer would then go on to select the correct BRIMs and any necessary PIMs for these switches. Referring to t[...]

Ether net 6-24 Ether net W orkgroup Design P erm utations It is also possible to use an Ethernet switch to connect a series of individual workgroups, rather than workstations or other devices. In these situations, the Ethernet switch acts as a device collapsed backbone for the network. The design process is exactly the same as that used to connect [...]

7-1 Chapter 7 F ast Ethernet This chapter e xamines the decisions and selections that must be made when designing a F ast Ether net workgroup solution. Should a Fast Ethernet workgroup solution be selected, the Network Designer has a specific series of issues to resolve and decisions to make befor e selecting a Fast Ethernet device that meets the [...]

F ast Ether net 7-2 F ast Ether net W orkgroup Devices The columns in the table provide the same information that T able 6-1 provides regar ding Ethernet devices. Switched De vices Cabletron Systems pr oduces one Fast Ethernet switching device, the FN100. The capabilities of the FN100, and the differing types of FN100 available ar e displayed in T [...]

F ast Ether net W orkgroup Design 7-3 F ast Ether net F ast Ethernet W orkgr oup Design The network design process for Fast Ethernet workgr oups is nearly identical to that used for standard Ethernet workgr oups. The Network Designer must first break the network up into workgr oups, if desired, determine how the stations in each workgroup will r e[...]

F ast Ether net 7-4 F ast Ether net Workgroup Design P ort Count The first device in the stack, whether an intelligent SEHI100TX-22 or non-intelligent SEH100TX-22, will provide connections for up to 22 Fast Ethernet stations. For every additional 22 Fast Ethernet stations or fraction thereof, the Network Designer must add one SEH100TX-22 to the st[...]

F ast Ether net W orkgroup Design 7-5 F ast Ether net The current network consists of 43 stations, including the shar ed servers and order entry system. The department curr ently operates on two standalone 24-port Ethernet repeaters that ar e connected to one another with a single jumper cable. All stations in the network are connected to these sta[...]

F ast Ether net 7-6 F ast Ether net Workgroup Design This expansion can continue until the stack contains five devices, the maximum number allowable with the stackable hub design. At this limitation, the stack will be capable of supporting up to 1 10 Fast Ethernet users. The network, as designed, will look like the depiction shown in Figure 7-2. F[...]

F ast Ether net W orkgroup Design 7-7 F ast Ether net Abstracting the Design Process As the Fast Ethernet switch selection field, shown in T able 7-2, contains only one device, the amount of decision-making remaining in the design pr ocess after the decision to use the Fast Ethernet technology is minimal. Due to the fact that the FN100-TX series i[...]

F ast Ether net 7-8 F ast Ether net Workgroup Design The Network Designer begins the design process by examining the available Fast Ethernet switch products. As the only devices available offering per-port Fast Ethernet switching are the four types of FN100 standalone switch, the selection field is very narrow , consisting of the products shown in[...]

F ast Ether net W orkgroup Design 7-9 F ast Ether net Figure 7-3. Fast Ethernet High-End Department Solution F ast Ethernet as a Backbone Due to the high throughput pr ovided by Fast Ethernet, it is conceivable that the technology could be used as a backbone solution to interconnect a series of workgroups. The Fast Ethernet switch will act as a dev[...]

F ast Ether net 7-10 F ast Ether net W orkgroup Design Figure 7-4. Initial Network Design Each departmental stack consists of one MicroMMAC-24E and one or mor e SEH-24 stackable hubs. In the initial configuration, the MicroMMAC-24Es have been configured with EPIM-A modules, which provide AUI ports for connection to a standard Ethernet AUI cable. [...]

F ast Ether net W orkgroup Design 7-11 F ast Ether net The Network Designer examines the four types of FN100 Fast Ethernet switch, looking to see which models support front panel multimode fiber optic connections. The FN100-8FX and FN100-16FX both provide multimode fiber optic connections for 100BASE-FX network media, and thus both meet the requi[...]

F ast Ether net 7-12 F ast Ether net W orkgroup Design Once the backbone switch has been selected, changes need to be made to the workgroups that will connect to the switch itself. As they stand, the current workgroups cannot connect to the Fast Ethernet backbone network. In or der to support Fast Ethernet connections to the FN100-16FX, the MicroMM[...]

8-1 Chapter 8 T oken Ring This chapter e xamines the decisions and selections that must be made when designing a T oken Ring workgroup solution. The process of designing a T oken Ring workgroup or a series of interconnected workgroups is somewhat dif ferent fr om the processes involved in designing an Ethernet or Fast Ethernet workgroup. The T oken[...]

T oken Ring 8-2 T oken Ring Workgroup De vices The available devices and the main distinctions between them are summarized in T able 8-1. The columns in the table provide the same information that T able 6-1 provides regar ding Ethernet devices. The Port Count field, again, is independent of the PIMs/BRIMs field. a. These products can be managed [...]

T oken Ring Workgroup Design 8-3 T oken Ring T oken Ring W orkgr oup Design Once a Network Designer understands the fundamentals of T oken Ring design, as described in the Cabletron Systems Networking Guide - MMAC-FNB Solutions , the design of a T oken Ring workgroup using standalone and stackable pr oducts is quite simple. If the limitations impos[...]

T oken Ring 8-4 T oken Ring W orkgroup Design Media It is assumed by this document that the selection of a networking media for the facility has already been completed befor e the hardwar e is examined. The media decision in the hardwar e selection stage of network design is one of ensuring that the selected device or devices will support the cabli[...]

T oken Ring Workgroup Design 8-5 T oken Ring This extension of the ring can be used to allow the T oken Ring network to connect widely-separated groups of stations in a single ring, or can be used to support greater numbers of users than a single T oken Ring stack can accommodate. A T oken Ring stack of maximum size will provide for the connection [...]

T oken Ring 8-6 T oken Ring W orkgroup Design When examining the Media characteristics of the devices remaining in the selection field, the Network Designer immediately eliminates the STHI-42/44 from consideration. The network being designed will use UTP cabling, which is not directly supported by the STHI-42/44. Examining the port count available[...]

T oken Ring Workgroup Design 8-7 T oken Ring Looking back at the initial selection field, the Network Designer locates the non-intelligent stackable devices and examines them for compliance with the needs of the network. The STH-22/24 non-intelligent stackable hub supports UTP cabling, and provides either 12 or 24 ports of station connectivity . T[...]

T oken Ring 8-8 T oken Ring W orkgroup Design[...]

A-1 Appendix A Char ts and T ab les This appendix provides a centr al location for a series of tab les that contain useful network design inf or mation. W orkgroup Design T ables Ethernet a. These products can be managed through the addition of an intelligent stackable de vice to their stack. T able A-1. Shared Ethernet W orkgroup Devices Product T[...]

Char ts and T ab les A-2 W orkgroup Design T ables F ast Ethernet a. These products can be managed through the addition of an intelligent stackable de vice to their stack. T able A-2. Ethernet W orkgroup Switches Name Max Management Media Port Count Switch Interfaces PIMs/BRIMs NBR-220 SNMP – 0 2 2 EPIMs NBR-420 SNMP – 0 4 4 EPIMs NBR-620 SNMP [...]

W orkgroup Design T ables A-3 Char ts and T ab les T oken Ring a. These products can be managed through the addition of an intelligent stackable de vice to their stack. T able A-4. Fast Ethernet W orkgroup Switches Name Max Management Media Port Count Switch Interfaces PIMs/BRIMs FN100-8TX SNMP UTP 8 8 0 FN100-16TX SNMP UTP 16 16 0 FN100-8FX SNMP M[...]

Char ts and T ab les A-4 W orkgroup Design T ables PIMs and BRIMs T able A-6. PIM Reference T able PIM T echnology Media Connector EPIM-A Ethernet AUI DB15 (Male) EPIM-C Ethernet Thin Coaxial RG58 EPIM-F1 Ethernet Multimode Fiber Optics SMA EPIM-F2 Ethernet Multimode Fiber Optics ST EPIM-F3 Ethernet Single Mode Fiber Optics ST EPIM-T Ethernet UTP R[...]

W orkgroup Design T ables A-5 Char ts and T ab les FPIM-00 FDDI Multimode Fiber Optics FDDI MIC FPIM-01 FDDI Multimode Fiber Optics SC FPIM-02 FDDI UTP RJ45 FPIM-04 FDDI STP RJ45 FPIM-05 FDDI Single Mode Fiber Optics FDDI MIC FPIM-05 FDDI Single Mode Fiber Optics SC APIM-1 1 A TM (T AXI) Multimode Fiber Optics SC APIM-21 A TM (OC3c) Multimode Fiber[...]

Char ts and T ab les A-6 W orkgroup Design T ables a. This table is subject to change as ne w BRIM modules and re vised firmware are released. T able A-7. BRIM Reference T able BRIM T echnology Connector T ype BRIM-E6 Ethernet EPIM BRIM-E100 Fast Ethernet EPIM BRIM-F6 FDDI FPIM (2) BRIM-A6 A TM APIM BRIM-A6DP A TM APIM (2) BRIM-W6 W AN WPIM T able[...]

Networking Standards and Limitations A-7 Char ts and T ab les Netw orking Standar ds and Limitations Ethernet Distance Limitations General Rules T able A-9. Ethernet Standard Distance Limitations Media Max Distance Thick Coax 500 m Thin Coax 185 m Standard AUI 50 m Office AUI 16.5 m UTP 100 m Fiber Optics (Multimode) 1000 m Fiber Optics (Single Mo[...]

Char ts and T ab les A-8 Networking Standards and Limitations F ast Ethernet Distance Limitations Network Radii T able A-1 1. Fast Ethernet (100BASE-TX/FX) Distance Limitations Media Max Distance UTP 100 m Fiber Optics (Multimode) 412 m T able A-12. Fast Ethernet Maximum Network Radii Repeater Class UTP UTP & Fiber Optics Fiber Optics UTP &[...]

Networking Standards and Limitations A-9 Char ts and T ab les T oken Ring Distance Limitations a. IBM T ype 6 cable is recommended for use as jumper cabling only , and should not be used for facility cabling installations. T able A-13. T oken Ring Maximums Media Circuitry Cable T ype Max # of Stations Max Lobe Length 4 Mbps 16 Mbps 4 Mbps 16 Mbps S[...]

Char ts and T ab les A-10 Networking Standards and Limitations Ring-In/Ring-Out Limitations General Rules T able A-14. Ring-In/Ring-Out Distances Media Max Distance (4 Mbps) Max Distance (16 Mbps) Shielded T wisted Pair 770 m 346 m Unshielded T wisted Pair Category 3/4 200 m 100 m Category 5 250 m 120 m Fiber Optics (Multimode) 2000 m 2000 m Fiber [...]

Networking Standards and Limitations A-11 Char ts and T ab les FDDI FDDI Distance Limitations General Rules a. Category 5 UTP cabling only b . IBM T ype 1 STP cabling only T able A-16. FDDI Distance Limitations Media PMD Standard Max Link Distance Fiber Optics (Multimode) MMF-PMD 2 km Fiber Optics (Single Mode) SMF-PMD 60 km Unshielded T wisted Pai[...]

Char ts and T ab les A-12 Networking Standards and Limitations[...]

Glossar y-1 Glossary This glossary provides brief descriptions of some of the r ecurrent terms in the main text, as well as related terms used in discussions of the r elevant networking discussions. These descriptions are not intended to be comprehensive discussions of the subject matter . For further clarification of these terms, you may wish to [...]

Attenuation to Client-Server Glossar y-2 Attenuation Loss of signal power (measur ed in decibels) due to transmission through a cable. Attenuation is dependent on the type, manufacture and installation quality of cabling, and is expressed in units of loss per length, most often dB/m. AU I Attachment Unit Interface. A cabling type used in Ethernet n[...]

Glossar y-3 Coaxial to Decr yption Coaxial An Ethernet media type which consists of a core of electrically conductive material surrounded by several layers of insulation and shielding. Concentrator A network device which allows multiple network ports in one location to share one physical interface to the network. Congestion An estimation or measure[...]

Dedicated to F ault-T olerance Glossar y-4 Dedicated Assigned to one purpose or function. Device (netw ork) Any discrete electronic item connected to a network which either transmits and receives information thr ough it, facilitates that transmission and reception, or monitors the operation of the network directly . DLM Distributed LAN Monitor . DL[...]

Glossar y-5 FDDI to Impedance FDDI Fiber Distributed Data Interface. A high-speed networking technology . FDDI requir es that stations only transmit data when they have been given permission by the operation of the network, and dictates that stations will receive information at pr e-determined intervals. See also T oken . Fiber Optics Network media[...]

Interf ace to MA C Address Glossar y-6 Interface A connection to a network. Unlike a port , an interface is not necessarily an available physical connector accessible through the fr ont panel of a device. Interfaces may be used as backplane connections, or may be found only in the internal operation of a module (All ports are interfaces, but not al[...]

Glossar y-7 MA U to Network Radius MA U Multistation Access Unit. Mbps Megabits Per Second. Mbps indicates the number of groups of 1000 bits of data that are being transmitted thr ough an operating network. Mbps can be roughly assessed as a measur e of the operational “speed” of the network. Media Physical cabling or other method of interconnec[...]

Node to Protocol Glossar y-8 Node Any single end station on a network capable of receiving, pr ocessing, and transmitting packets. NVRAM Non-V olatile Random Access Memory . Memory which is protected fr om elimination during shutdown and between periods of activity , frequently through the use of batteries. Octet A numerical value made up of eight [...]

Glossar y-9 PVC to Ser v er PVC Polyvinyl Chloride. A material commonly used in the fabrication of cable insulation. This term is used to describe a non-plenum rated insulating material. See also Plenum . PVC releases toxic smoke when burned. Redundant Extra or contingent. A redundant system is one that is held in reserve until an occurrence such a[...]

SIMM to Switch Glossar y-10 SIMM Single In-line Memory Module. A collection of Random Access Memory (RAM) micropr ocessors which are placed on a single, r eplaceable printed circuit boar d. These SIMMs may be added to some devices to expand the capacity of certain types of memory . Single Attached Connected to an FDDI network through a single cable[...]

Glossar y-11 TCP to UTP TCP T ransmission Control Pr otocol. T erminal A device for displaying information and relaying communications. T erminals do not perform any processing of data, but instead access processing-capable systems and allow users to contr ol that system. Throughput The rate at which discr ete quantities of information (typically m[...]

UTP to UTP Glossar y-12[...]

Inde x-1 Index Numerics 100BASE-FX 2-3 100BASE-TX 2-3 A Active circuitry 2-6 APIM 4-5 Assistance 1-3 B Backbones collapsed 5-19 definition 5-17 device 5-20 distributed 5-18 Fast Ethernet 7-9 selection 5-21 Bandwidth 2-2 Bridge 3-2 BRIM 3-7, 4-8, 4-8 to 4-10 C Chapter summaries 1-2 Collapsed backbone 5-19 Concentrator 3-2 CSMA/CD 2-2 Customer Suppo[...]

Inde x Inde x-2 H Help 1-3 High-end department 6-19, 7-6 Home office 6-5 HubST ACK Interconnect Cables 3-5 I Installation planning 5-11 Interconnect cables 3-5 internetworking 4-8 Introduction 1-1 N Network growth 5-15 layout 5-10 planning 5-10 Network map 5-14 Network radius 2-4 Networking Services 1-3 P PIM 4-1 A TM 4-5 decoding 4-2 Ethernet 4-3[...]