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Magnum 8000X Mixed-Media Fiber Hubs Installation and User Guide (05/ 02)
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results in more available network bandwidth on both sides and a throughput increase on
for all users on both domains.
3. Software Transparency
The Magnum 8000X Dual-Speed 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 PM-RJ45 and PM-RJ45U 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 10 Mbps.
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
8000X copper port is connected to a non-negotiating device, it will default to 10 Mbps
speed. Since Magnum 8000Xs 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 10Mb or
100Mb 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
.
4.4 Chassis LEDs
The Magnum 8000X 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 8000X unit and its
associated PM cards.
Magnum 8000X chassis unit LEDs
LED Description
PWR Illuminates GREEN to indicate that the unit is receiving power.
BR GREEN, Steady ON, unit has bridge inside
COL Flashes YELLOW to indicate a collision, one each for 10 and 100Mbps
ACT Flashes for packet activity, one each for 10 and 100Mbps domains