GarrettCom 500-Series manual Auto-negotiation for 10Mb ports, half- or full-duplex mode

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Magnum 500-Series Switching Hubs

Installation and User Guide (08/98)

 

 

The auto-negotiation logic will attempt to operate in descending order and will normally arrive at the highest order mode that both devices can support at that time. (Since auto- negotiation is potentially an externally-controlled process, the original “highest order mode” result can change at any time depending on network changes that may occur). If the device at the other end is not an auto-negotiating device, the Magnum 528’s Fast Ethernet ports will try to detect its idle signal to determine 10 or 100 speed, and will default to half duplex.

General information -

Auto-negotiation per-port for 802.3u-compliant switches occurs when:

the devices at both ends of the cable are capable of operation at either 10Mb or 100Mb speed and/or in full- or half-duplex mode, 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 above, but may be occasionally encountered.

When operating in 100Mb half-duplex mode, cable distances and hop-counts

may be limited within that collision domain. The Path Delay Values (PDV) bit-times must account for all devices and cable lengths within that domain. For Magnum 528 Fast Ethernet switched ports operating at 100Mb half-duplex, the bit time delay is 50BT.

4.5Auto-negotiation for 10Mb ports, half- or full-duplex mode

Full-duplex Ethernet provides separate Transmit and Receive data paths, enabling simultaneous bi-directional collision-free data movements on a port. The network topology must be a “star” type, not a “bus” type. With full-duplex mode, the

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Contents Switching Hubs Trademarks Contacting Garrett Communications Fax 510 Email support@garrettcom.comInstallation Table of ContentsMagnum Specifications Power Supply Internal Warranty100Mb/s Multi-mode Port Optical Typical Worst LEDsOrdering Information MagnumMagnum 528F-SC Magnum 528F-STIntroduction Product Description Magnum 500-Series Switching HubsInspecting the Package and Product 2a Front view Magnum 508, 528 and 528F Switching Hubs Magnum 500-Series chassisUplink @ 100Mb Fiber port, type ST or SC Magnum 528F models only Frame Buffering and LatencyGarrett Full-duplex or Half-duplex operation, auto-sensing High PerformanceAssured 100Mb performance in any network set-up Dynamic Buffer Space AllocationApplications Example 1 MagnumExample 2 Magnum Example 3 Magnum InternetExample 4 Magnum 528F InternetInstallation Locating Magnum 500-Series switchesWall or Vertical Surface Mounting Magnum 500-Series, metal mounting brackets Optional E-StandMagnum 500-Series AC power connector Media Ieee Standard Connecting Ethernet Media100BASE-TX connections Magnum 528 only Connecting Fiber Optic 100BASE-FX, Type ST and SC 100BASE-TX connections Magnum 528F onlyMagnum 528’s internal jumpers for auto-negotiation on or OFF OperationFiltering and Forwarding Switching FunctionalityAddress Learning PWR LK/RXFDX AutoAuto-negotiation option for Fast Ethernet copper ports Auto-negotiation for 10Mb ports, half- or full-duplex mode Collision-based Flow-control Troubleshooting Before Calling for AssistanceReturn Material Authorization RMA Procedure When Calling for AssistanceNo Problem Found Shipping and Packaging Information B2.0 Magnum 508, 528 and 528F 48VDC Option Appendix B 48VDC AddendumB3.0 Applications B6.0 Troubleshooting B4.0 InstallationB5.0 Operation