Black Box LH8050A Installation And User Manual
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Black Box LH8050A Installation And User Manual

Black Box LH8050A Installation And User Manual

Mixed-media fiber hub
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Black Box Corporation
The World's Source for Connectivity
© Copyright 1999. Black Box Corporation. All rights reserved.
1000 Park Drive · Lawrence, PA 15055 · (724) 746-5500 · Fax (724) 746-0746
Mixed-Media Fiber Hub
Customer
Call our Technical Support Specialists to discuss your application.
Support
For 24-hour technical support: Call (724) 746-5500 or Fax: (724) 746-0746
Information
To order: Call (724) 746-5500 7:00 A.M. to 8:00 P.M. EST
Mail order: Black Box Corporation. 1000 Park Drive, Lawrence, PA 15055
April 1999
LH8050A

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  • Page 1 1000 Park Drive · Lawrence, PA 15055 · (724) 746-5500 · Fax (724) 746-0746 Support For 24-hour technical support: Call (724) 746-5500 or Fax: (724) 746-0746 Information To order: Call (724) 746-5500 7:00 A.M. to 8:00 P.M. EST Mail order: Black Box Corporation. 1000 Park Drive, Lawrence, PA 15055...

  • Page 2: Black Box

    Important: The LH8050A Mixed-Media Dual-Speed Fiber Hubs contain no user- serviceable parts. Attempted service by unauthorized personnel shall render any and all warranties null and void. If problems are experienced with an LH8050A, consult Section 6, Troubleshooting, of this User Guide.

  • Page 3: Fcc Statement

    Black Box Mixed-Media Fiber Hubs Installation and User Guide (4/99) FCC STATEMENT FEDERAL COMMUNICATIONS COMMISSION CANADIAN DEPARTMENT OF COMMUNICATIONS RADIO FREQUENCY INTERFERENCE STATEMENTS This equipment generates, uses, and can radiate radio frequency energy and if not installed and used properly, that is, in strict accordance with the manufacturer’s instructions, may cause interference to radio communication.

  • Page 4: Instrucciones De Seguridad

    Black Box Mixed-Media Fiber Hubs Installation and User Guide (4/99) NORMAS OFICIALES MEXICANAS (NOM) ELECTRICAL SAFETY STATEMENT INSTRUCCIONES DE SEGURIDAD Todas las instrucciones de seguridad y operación deberán ser leídas antes de que el aparato eléctrico sea operado. Las instrucciones de seguridad y operación deberan ser guardadas para referencia futura.

  • Page 5: Table Of Contents

    MEDIA FIBER HUB 2.1 Inspecting the Package and Product..............5 2.2 General Information .................... 6 2.3 Product Description - LH8050A Fiber Hub ............6 2.3.1 The LH8050A Fiber Hub Chassis ............7 2.4 Port Modules (PMs) ................... 8 Hubs with Switch Port Modules (SPMs) built in ..........9 2.5.1 LH8050A-SST ..................
  • Page 6 Black Box Mixed-Media Fiber Hubs Installation and User Guide (4/99) 4. OPERATION -......................33 4.1 Repeater Functionality ..................33 4.2 Dual Speed Functionality .................34 4.3 Auto-negotiation and speed sensing ..............36 4.4 Chasis LEDs.....................36 4.5 Power Budget Calculations for Fiber Media .……………… ......37 5.
  • Page 7 Black Box Dual-Speed Stackable Hubs Installation and User Guide (04/99) Technical Specifications Performance (hub supports both 10 and 100Mbps domains, ports individually selected) When a port is operating at 100Mbps Data Rate: 100Mbps PDV (Path Delay Value): 80BT, exceeds Class II...
  • Page 8 100Mbps copper (RJ-45): Category 5 UTP/STP 10 Mbps copper: Cat 3, 4, 5 UTP (Note: auto-neg. doesn’t sense cable type) Stacking Cable - stacking may be up to three units (48 ports) of mixed-media LH8050A hubs and/or LH8016A-C Dual-Speed hubs.
  • Page 9 Black Box Mixed-Media Fiber Hubs Installation and User Guide (4/99) (For Power Budget data, see Section 4.5) PM Model # IEEE Standard Speed Connector type -Mode LH8051C-ST 100Mbps ST “twist-lock” multi- LH8051C-SC 100Mbps SC “snap-in” multi- LH8051C-SMSC 100Mbps SC “snap-in”...

  • Page 10: Ordering Information

    LH8057A-PNL Blank cover for an unused port. Request quote for other fiber media types, as new items may be added LH8050A models with Switch Port Modules (SPMs) in the Bonus Port: LH8050A-SSC Includes SPM w/ full-duplex 100Mb multi-mode fiber FX SC connector, i.e., a separate switch with packet buffers and filter/forward operation...

  • Page 11: Introduction - Lh8050A Mixed-Media Fiber Hub

    Note: Port Modules (PMs) purchased for field installation will be boxed individually in a “bar-of-soap-size” cardboard carton with labeling on the box to indicate the contents. LH8050A-xxx, models with Switch Port Modules in the Bonus Port (see previous page for product Model descriptions) come with 10 LH8057A-PNL blank slot panels each.

  • Page 12: General Information

    The LH8050A is designed with the capability to be stacked with LH8016A-C’s. The LH8050A units may be configured in a stack with as many as 3 total units. The two shared traffic domains automatically expand to support all of the ports in the stack. Any combination...
  • Page 13 48 front Ethernet segments with a mix of fiber and copper ports is supported. The LH8050A is compact in design at only 1.75 in. (4.4 cm) high, and has a lightweight metal enclosure. It is easily rack mounted in a standard 19" rack and typically operates in a rack as the departmental hub for a multiple-backbone Ethernet network.

  • Page 14: Port Modules (Pms)

    With the bonus slot used, the LH8050A becomes a 16-port dual-speed hub with one switched up-link. There are a total of six standard PM cards, each for a specific media cable connector. A seventh module type is used as a face plate when any front slot is not used. The LH8050A...
  • Page 15 PMs for other fiber port types (for example, 10 Mbps SC-type) are possible as specials. If you need a different port type from those shown, contact Black Box for an RFQ. The PMs are normally installed or changed or removed in the field by a careful technician.
  • Page 16 CONNECTORS SUPPLY MODULE Figure 2.5a: Inside view of LH8050A with SPM installed. (Rear view) For the specifications of LH8050A models with Switch Port Modules (SPMs) installed, see Section 1.3. The functions of an SPM are described below. Filtering and Forwarding / Address Learning The SPM has two ports - one where media attaches, and one connecting into the inside of the mixed-media fiber hub in which the SPM is mounted.
  • Page 17 Black Box Mixed-Media Fiber Hubs Installation and User Guide (4/99) Segment 1 Segment 2 (Bonus Port) (Inside of Hub) Segment 2’s packets are filtered when the destination addresses are in its address table. Segment 1’s packets are forwarded when the destination addresses are NOT in its address table.

  • Page 18: Lh8050A-Sst

    2.5.1 LH8050A-SST (includes an SPM with mm fiber-ST port in the bonus port) The significant feature of the LH8050A-SST is that the built-in switched fiber bonus port operates in full-duplex mode, sending packets on one fiber filament while simultaneously and independently receiving packets on the other.

  • Page 19: Lh8050A-Ssc

    2.5.3 LH8050A-SSCSM (includes an SPM w/ sgl-mode fiber-SC port in bonus port) The LH8050A-SSCSM is an LH8050A hub with a built-in single-mode full-duplex fiber optic switching port module, with a 100Mbps SC-type connector. The module may be used to connect to another 100Mbps hub or switch using fiber cabling and using the 100BASE-FX protocol.

  • Page 20: Lh8050A-Srj

    100Mbps. If the connected device does not positively indicate that it is capable of 100Mbps speed, then the operation on that LH8050A port will be at 10 Mbps. Of course, the hubs’ auto-negotiation technique is only for 10 / 100 speed, and does not provide for any full-...

  • Page 21: Stacking Mixed-Media Lh8050A

    25-pin IRB connectors on each unit: the bottom IRB connector which is used to daisy chain the IRB to the stacked unit below (unused on bottom unit in an LH8050A stack); and the top IRB connector which is used to daisy chain the IRB to the stacked unit above (unused on top unit in an LH8050A stack).

  • Page 22: Features And Benefits

    (The Model special LH8050A-C is an “client” unit for stacking, and has no bridge inside, so it’s BR LED will always be off). In a stack of LH8050A’s and / or other compatible hubs, only one unit with a bridge inside may be operating in any one stack...

  • Page 23: Applications

    Mixed-Media 10 & 100Mbps fiber port types in one unit for maximum flexibility The LH8050A is configurable with up to 16 economical port modules, and any or all of the ports may be either 10 or 100Mbps fiber. RJ-45 ports may also be configured, with per-port selection.
  • Page 24 The flexibility of the LH8050A makes it the choice for applications that require a flexible and adaptable 10/100 hub.
  • Page 25 Fiber LANs are regularly used to connect to each desktop and each node. The LH8050A Fiber Hubs support all of the fiber port types (including the latest models), adapting the fiber LAN to changing technology. The Dual- Speed feature provides for growth...
  • Page 26 SPM can segment local users from the rest of the network. Stacking provides capacity for up to 48 ports, and the LH8050A can be stacked with an LH8016-C for a mix of RJ-45 and fiber ports. The flexibility results in a “future-proof” fiber hub. The illustration above shows this...

  • Page 27: Locating The Lh8050A

    Ethernet media types. Locating the LH8050A The location of the LH8050A is dependent on the physical layout of the network and the area to be served. The unit is typically rack mounted in a wiring closet but because it has rubber feet it can also be installed on a shelf or table top.

  • Page 28: Connecting Fiber Optic St-Type "Twist-Lock

    The following procedure applies to installations using an PM with SC-type fiber connectors. This procedure applies to ports using an LH8051C-SC, LH8051C-SMSC single- mode,LH8055C-SC, LH8055C-SMSC, and to SPM LH8050A-SSC and LH8050A-SSCSM single-mode. When connecting fiber media to SC connectors, simply snap on the two square male connectors into the SC female jacks of the PM until it clicks and secures.

  • Page 29: Connecting Twisted-Pair, Rj-45

    Section 3.3 and 3.4 above. Connecting Twisted Pair (RJ-45,CAT3, CAT5, Unshielded or Shielded) The RJ-45 ports of the LH8050A Dual-Speed Fiber Hubs can be connected to the following two media types: 100BASE-TX and 10BASE-T. CAT 5 cables should be used when making 100BASE-TX connections.
  • Page 30 Black Box Mixed-Media Fiber Hubs Installation and User Guide (4/99) The 100Mbps Collision Domain Diameter is the length of the longest path between any two devices in a single collision domain. A collision domain is defined as a cluster of network devices which are connected by means of a repeater or repeaters such that no bridging devices are present between any two devices in the cluster.
  • Page 31 A typical example of a PDV calculation is shown below, and is illustrated in Figure 3.6.1a. Here, an integrator wishes to cascade the 100Mbps collision domains of two LH8050A Mixed-Media Fiber Hubs (each having a PDV of 80 BT) for use with standard 100m Category 5 user cable segments (i.e.
  • Page 32 In the above example, 75 is the BT delay for 70m of Category 5 cable (1.112 BT/m), 80 is the bit time delay for each LH8050A front-to-front ports, 100 is the BT delay for the TX DTE pair in the user stations, and 2 BT is the safety margin applied.

  • Page 33: Rack-Mounting

    NIC which can send and receive the Fast Link Pulse (FLP) coding for the 100BASE-TX signaling system. When connecting a NIC to the LH8050A, it may be necessary to reload the NIC drivers on the user device if the NIC has been communicating with a protocol other than 100BASE-TX (such as 10BASE-T).

  • Page 34: Preparation For Installing And Removing Pms

    Black Box Mixed-Media Fiber Hubs Installation and User Guide (4/99) replaced. In cases where additional PM cards are needed, the face plate for an available front-mounted slot must be removed. The following procedure describes this operation 3.9.1 Preparation for Installing and Removing PMs...
  • Page 35 Installation and User Guide (4/99) Looking down into the LH8050A unit, notice that there are individual PM connector sockets for each PM card position. There are 16 slots located on the front of the unit and a bonus slot on the rear of the unit.
  • Page 36 Figure 3.9.2b: Inserting PM Cards into an LH8050A NOTE: All PM slots need not be filled in order for the LH8050A unit to be operational. When leaving PM slots empty, always use a face plate LH8057A-PNL to cover the slot opening in the front panel.

  • Page 37: Removing Pm Cards

    Step 4. Once all PM cards have been installed (including face plates for empty slots), the chassis cover should be replaced. 3.9.3 Removing PM Cards To properly remove an PM card from the LH8050A Stackable Mixed-Media Hub, follow the three steps below. Step 1. Remove chassis cover See procedure in Section 3.9.1 above.

  • Page 38: Powering The Lh8050A

    AC power cord at the right-rear. A six foot 115vac power cord is supplied with each unit. (Units shipped from the Black Box to outside the United States and Canada will not include a 115vac power cord.)

  • Page 39: Operation

    LH8050As are hardware plug-and-play devices. There is no software set-up to be done at installation or for maintenance. The functions of the LH8050A are described in this manual. Each time a packet is received on one domain of the bridge module, the decision is taken to either to filter or forward the packet.
  • Page 40 The Black Box LH8050A bridge module is a state machine design which has a total address table capacity of 8K addresses. With a large address table, an LH8050A can serve the needs of a medium-sized to large network. Table 4.2 shows what filter / forward action the LH8050A will take in each packet-processing situation, and when a new node address will be added to the internal Address Table.

  • Page 41: Auto-Negotiation And Speed Sensing

    When the ‘S’ LED is steady ON, the port has auto-negotiated for 100Mbps operation and is running at 100Mbps. When it is steady OFF, it is at 10 Mbps. If a LH8050A copper port is connected to a non-negotiating device, it will default to 10 Mbps speed. Since LH8050As are hubs, front ports always operate in half-duplex mode.
  • Page 42 Installation and User Guide (4/99) Chassis LEDs The Black Box LH8050A is equipped with six LEDs located on the front of the chassis unit (see Figure 2.3b). These LEDs are Power (PWR), Bridge(BRD), Collision (COL) and Activity (ACT) for 10 and 100Mbps speed. They are used to provide visual indication about the operational condition and traffic activity of the LH8050A unit and its associated PM cards.
  • Page 43 Receiver sensitivity and Transmitter Power is the only information necessary to compute the power budget. To calculate the power budget of different fiber media installations using LH8050A, the following equations should be used: OPB (Optical Power Budget) = P (min) - P...

  • Page 44: Inspecting The Package And Product

    Chapter 6 for specific return procedures. Product Description An important feature of the LH8050A Hub is the use of individual Port Modules (PMs) for flexible mixed-media connectivity to RJ-45 and fiber media. Since the LH8050A’s have dual-speed capability per-port, the front port slots are designed to support all standard Ethernet media types at 10 or 100Mps speed.
  • Page 45 100BASE-FX, -SX and 10BASE-FL ST Connecto optics transceiver to support 100BASE-FX network segments. When installed in an LH8050A half-duplex hub, it supports fiber optic cable distances only up the IEEE- specified 100Mbps shared-collision-domain distance limits, i.e., typically 200 meters. ACTIVITY...

  • Page 46: Lh8051C-Smsc 100Mbps Single-Mode Fx, Sc-Type

    100BASE-FX, 10BASEFL sgl.mode The LH8051C-SMSC, when installed SC Connectors in an LH8050A hub, supports fiber distances the same as 100Mbps multi-mode ports because of the 100Mbps collision domain limitations, so it is only practical for use where single-mode fiber cable is already installed and must be used.
  • Page 47 MT-RJ’s small size and ease of connection 100BASE-FX MT-RJ Connector make it a good choice for 100Mbps “fiber-to- the-desktop” Ethernet connectivity. When installed in an LH8050A half-duplex hub, it supports fiber optic cable distances only up the 100Mbps shared-collision-domain distance limits, i.e., typically 200 meters. ACTIVITY...

  • Page 48: Lh8056C And Lh8056C-Up (Twisted Pair)

    Black Box Mixed-Media Fiber Hubs Installation and User Guide (4/99) The small size, about the same as an RJ-45, reduces the size of wiring panels in wiring closets while providing the advantage of “future-proof” fiber optic technology. The cable port is a “plug-in” connector, with both fiber strands terminated in one housing that cannot be improperly inserted.

  • Page 49: Lh8057A-Pnl (Face Plate)

    Technical Support for help. If you are unsure of any procedure described in this chapter, or if the Dual-Speed Fiber Hub is not operating as expected, do not attempt to repair or alter the unit. Contact Black Box for assistance. Before Calling for Assistance If you have difficulty installing or operating the Dual-Speed Fiber Hub, refer to Chapters 3 and 4.

  • Page 50: When Calling For Assistance

    It contains no user-serviceable parts. Contact Black Box at (724) 746-5500. Before you do, make a record of the history of the problem. Black Box will be able to provide more efficient and accurate assistance if you have a complete description, including: •...

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