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Black Box Mixed-Media Fiber Hubs

Installation and User Guide (4/99)

processed. The address tables are flushed periodically to update the network status and to purge

any inactive stations from the tables of both domains.

Throughput Increase

By selectively forwarding packets from each domain to the other domain based on

its switching (bridging) logic, the LH8050A increases the available bandwidth for the users on

both sides of the network. As shown in Figure 4.2, it keeps the local traffic on each side

contained, preventing unnecessary packets and bad packets from traveling to the other domain

and using up bandwidth needlessly over there. This results in more available network

bandwidth on both sides and a throughput increase on for all users on both domains.

3. Software Transparency

The LH805A Dual-Speed Fiber Hubs need no software set-up and are transparent to

system and application software, including network management software.

4.3 Auto-negotiation and speed-sensing

The Port Module LH8056C and LH8056C-UP ports independently support auto-

negotiation for shared 10BASE-T and 100BASE-TX modes. When the ‘

S’

LED is flashing on a

port, it means that the hub is sending out auto-negotiation pulses on that port. When a LINK

connection is initially made, the other device should respond and both sides should agree on the

speed capability being signaled. The device connected, depending on what it is, will either

signal that it is capable of 10 Mbps or 100Mbps speeds. Silence means the port defaults to

10Mbps.

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.

General information -

Auto-negotiation per-port for dual-speed hubs occurs when:

the devices at both ends of the cable are capable of operation at either 10 Mbps or
100Mbps speed, and can send/receive auto-negotiation pulses, and . . .

-- when the second of the two connected devices is powered up*, i.e., when LINK is
established for a port, or

-- when LINK is re-established on a port after being lost temporarily.

NOTE

–

some NIC cards only auto-negotiate when the computer system that they are in is

powered up. These are exceptions to the “negotiate at LINK – enabled” rule, but may be
occasionally encountered

Содержание LH8050A

Страница 1: ...4 746 5500 Fax 724 746 0746 April 1999 LH8050A Mixed Media Fiber Hub Customer Call our Technical Support Specialists to discuss your application Support For 24 hour technical support Call 724 746 5500...

Страница 2: ...rvice 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 1999 Black Box Corpor...

Страница 3: ...n the equipment is operated in a commercial environment Operation of this equipment in a residential area is likely to cause interference in which case the user at his own expense will be required to...

Страница 4: ...netes que impidan el flujo de aire por los orificios de ventilaci n 10 El equipo el ctrico deber ser situado fuera del alcance du fuentes de calor como radiadores registros de calor estufas u otros ap...

Страница 5: ...ummary Table 14 2 6 10 100 Speed Auto Sensing front ports copper only 14 2 7 Stacking Mixed Media LH8050A 14 2 8 Bridge module between the 10 100Mbps domains 16 2 9 Features and Benefits 17 2 10 Appli...

Страница 6: ...lock connector 39 5 2 2 LH8051C SC 100Mbps mult imode FX w SC snap in connector 39 5 2 2a LE8055C SC 10 Mbps multi mode FL SC snap in connector 40 5 2 3 LH8051C SMSC 100Mbps single mode FX SC type 40...

Страница 7: ...both traffic domains Packet buffers 2MB dynamically allocated shared on both domains Latency not including packet time 100 to 10 Mbps 5 s 10 to 100Mbps 5 s CPU Type State Machine Maximum Ethernet Seg...

Страница 8: ...t Module only for crossover and cascading Auto 100 Switch LH8056C and LH8056C UP port Module for auto negotiation or fixed 100Mbps speed operation Packaging Enclosure High strength metal 1U rack mount...

Страница 9: ...lank cover for an unused port slot Two LED indicators per fiber port in each PM are L for LINK is made A for traffic Activity Additional LED for RJ 45 ports are S for Speed where flashing indicates au...

Страница 10: ...FX MT RJ connector LH8053C VF45 Module w 100Mbps mm Fiber FX VF 45 connector LE8055C ST Module w 10 Mbps mm Fiber FL ST connector LE8055C SC Module w 10 Mbps mm Fiber FL SC connector LE8055C SMST Mod...

Страница 11: ...ide For blank cover plates order Model LH8057A PNL see previous page for descriptions Note Port Modules PMs purchased for field installation will be boxed individually in a bar of soap size cardboard...

Страница 12: ...ies provide the ultimate in flexibility for small to medium sized fiber to desktop and fiber for security networks that are gradually transitioning from 10 Mbps Ethernet to 100Mbps Fast Ethernet Sixte...

Страница 13: ...g individual PMs one per Ethernet port to be used Configured LH8050A units provide two traffic domains one each with IEEE 802 3 and 802 3u repeater functionality 7 Figure 2 3 a LH8050A Front View LEDs...

Страница 14: ...is especially desirable for 100Mbps traffic domains which are Path Delay Value PDV limited PMs for the front slots may not be used in the rear Bonus Port slot Inter Repeater Bus IRB The IRB allows an...

Страница 15: ...face plate to cover blank slots PM LH8056C not shown looks like LH8056C UP but without the up link switch push button For additional details and descriptions of each Port Module see Section 5 of this...

Страница 16: ...Error packets are always filtered For good packets the filter or forward decision is made based on the destination address contained in each packet If the destination address is on the segment from w...

Страница 17: ...switching logic an SPM increases the available bandwidth for the users on both the hub side and the rear segment side of the network As shown in Figure 2 5b it keeps the local traffic on each side con...

Страница 18: ...setting the jumper in position 1 2 it will operate as shared half duplex To operate properly in either half or full duplex mode the device on the other end of the fiber segment must also be a corresp...

Страница 19: ...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...

Страница 20: ...he SPM in the LH8050A SRJ has two LED s LINK and RX to allow monitoring of link and packet reception status of the SPM s operation 2 5 5 SPM Specification Summary Table Connector Standard Mb s Traffic...

Страница 21: ...LH8016A C or special LH8050A C units are designed to provide proper operation of up to three dual speed hub units in a stack and longer or unshielded cables are not permitted as they will not operate...

Страница 22: ...h less than traditional store and forward bridge products enabling the LH8050As to maintain high network performance The bridge has 8K node address capacity suitable for use in large networks Addresse...

Страница 23: ...proved performance for the LH8050A s users Stackable and Scaleable Configurations The LH8050A is equipped with an inter repeater bus that allows multiple units one LH8050A and up to two special LH8050...

Страница 24: ...and those specifications should be adhered to for all applications A summary of each Ethernet media type and the corresponding LH8050A PM s is presented here IEEE Standard Media Type Max Distance LH80...

Страница 25: ...opper ports The LH8050A not only increases the network s bandwidth and efficiency but it also handles existing 10 Mbps nodes over fiber in a economical way The print server stays at 10 Mbps over twist...

Страница 26: ...and may be a mix of 10 and 100Mbps and may be any quantity or mix of standard port connector types Individual 10 100 RJ 45 ports may be configured also and an optional SPM can segment local users fro...

Страница 27: ...his section describes installation of the Mixed Media LH8050A Fiber Hub as well as connection of the various Ethernet media types 3 1 Locating the LH8050A The location of the LH8050A is dependent on t...

Страница 28: ...ore connecting Note One strand of the duplex fiber optic cable is coded using color bands at regular intervals you must use the color coded strand on the associated ports at each end of the fiber opti...

Страница 29: ...ters 328 ft Media IEEE Standard Connector Twisted Pair CAT 3 4 5 10BASE T RJ 45 Twisted Pair CAT 5 100BASE TX RJ 45 NOTE It is recommended that high quality CAT 5 cables which work for both 10 Mbps an...

Страница 30: ...ociated BT delay which depends on the physical signaling system employed Table 3 6 1b shows each Fast Ethernet device component and the associated BT delay A DTE is an end node such as a user station...

Страница 31: ...TX DTE pair and a safety margin of 2 was used 512 X 508 BT X 4 BT 25 Figure 3 6 1a Two cascaded LH8050A hubs The resulting value tells us that a Category 5 cable with a length of up to 25 meters may...

Страница 32: ...that merely meet the standard Table 3 6 1c shows maximum cable lengths for common network configurations using industry standard repeater PDV numbers Calculations such as above should be performed us...

Страница 33: ...can be easily mounted on a table top or any suitable horizontal surface and has four rubber feet to provide stability without scratching finished surfaces 3 8 Rack Mounting Installation of an LH8050A...

Страница 34: ...trical equipment are sensitive to static discharge Use proper ESD measures when handling port modules Step 1 Remove Chassis Cover To make the installation of port module easy the top cover is separate...

Страница 35: ...t there is one retaining screw for each PM card slot These screws are used to secure an PM face plate in position These screws are also used to secure the individual PM card which can be subjected to...

Страница 36: ...port and install Some of the port modules may fit easily on one port and be difficult to install on another Step 3 Slowly and carefully apply enough pressure to insert the PM card into position see F...

Страница 37: ...the PM and Face Plates On the bottom front of the unit there is one retaining screws for each PM card slot and face plate These screws are used to secure a PM card in position see Figure 3 9 3a Remov...

Страница 38: ...e United States and Canada will not include a 115vac power cord The LH8050A supports installation environments where the AC voltage ranges from 90 260 volts with a power input frequency of between 47...

Страница 39: ...integrity is checked every 800 ms and segment port reconnection occurs after a 512 bit packet is transmitted without error 4 Link Status The LH8050A PMs indicate link integrity for fiber optic and twi...

Страница 40: ...Filter Table 4 2 LH8050A Dual Speed Hub Functionality 1 Address Learning Address Table Maintenance The Black Box LH8050A bridge module is a state machine design which has a total address table capacit...

Страница 41: ...the S LED is flashing on a port it means that the hub is sending out auto negotiation pulses on that port When a LINK connection is initially made the other device should respond and both sides should...

Страница 42: ...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 LH8050A chassis unit LEDs LED D...

Страница 43: ...dB Worst OPB dB Worst Distance Km fdx Typical OPB dB Typical Distance Km fdx LE8055C ST SC 10 Mb FL Multi mode 2 2 850 62 5 125 100 140 50 125 15 0 9 5 19 5 31 31 31 14 19 5 9 5 5 5 9 3 4 17 23 5 13 5...

Страница 44: ...ls Remove the PM s from the shipping container Be sure to keep the shipping container should you need to ship any of the PMs separately at a later date In the event there are items missing or damaged...

Страница 45: ...ing on the front of the module identifies it as 100 FX to avoid confusion with other similar looking PMs 5 2 1a LE8055C ST 10 Mbps multi mode FL ST type twist lock connector The LE8055C ST is a multi...

Страница 46: ...ulti 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 2 1 40 Note to support long fibe...

Страница 47: ...cally 200 meters 41 The functionality of this 100BASE FX multi mode FPM is same as the ST and SC types and it is equipped with the same ACTIVITY A and LINK L LEDs to indicate proper connectivity with...

Страница 48: ...e Auto 100 switch is provided for user selection between operation in the auto negotiation mode Auto or fixed at 100Mbps 100 with no auto negotiation and no 10 Mbps The LH8056C UP module is equipped w...

Страница 49: ...slots must be covered with the LH8057A PNL face plate in order to maintain proper cooling air flow and for safety etc LH8057A PNL Note The LH8057A PNL must be installed in each empty PM slot _________...

Страница 50: ...not attempt to alter or repair the unit 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 pro...

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